Title of Invention	A DEVICE FOR OBTAINING STRUCTURE DATA FROM A MOVING OBJECT WITH A HIGH SPECIAL AND TIME RESOLUTION
Abstract	Device for obtaining structure data of a moving object In addition to a radiation source (6) attached to a C-arm 4, and in addition to a detector (7) , a rotation angiography de-vice (1) for the angiocardiography has an evaluation unit (8), which formulates models with low resolution from the projec-tion images supplied by the detector (7) for the moving object to be examined, and which generates movement fields for the projection images generated by the detector (7) on the basis of the model, so that movement-corrected projection images can be calculated from the projection images, which can be used to formulate a three-dimensional high-resolution model of the ob-ject to be examined.

Title of Invention

A DEVICE FOR OBTAINING STRUCTURE DATA FROM A MOVING OBJECT WITH A HIGH SPECIAL AND TIME RESOLUTION

Abstract

Device for obtaining structure data of a moving object In addition to a radiation source (6) attached to a C-arm 4, and in addition to a detector (7) , a rotation angiography de-vice (1) for the angiocardiography has an evaluation unit (8), which formulates models with low resolution from the projec-tion images supplied by the detector (7) for the moving object to be examined, and which generates movement fields for the projection images generated by the detector (7) on the basis of the model, so that movement-corrected projection images can be calculated from the projection images, which can be used to formulate a three-dimensional high-resolution model of the ob-ject to be examined.

Full Text	2004P01309 International Version 1 Description Device for obtaining structure data of a moving object The invention relates to a device for obtaining structure dat of a moving object with - a radiation source which can be moved about an object alone a measurement path, - a detector arranged on the opposite side of the object and which can be moved according to the movement of the radia-tion source and, - an evaluation unit which determines the structure data of the object from the projection images. A device of this type is generally known from US 2002/0186871 Al and from the field of three-dimensional angiocardiography Three-dimensional structure data of the moving heart is ob-tained in rotation angiocardiography, in which an X-ray source and an X-ray detector rotates about the patient at an angular range greater than 180° and thus records projection images of the moving heart The structure data of the object can then essentially be determined in the form of three dimensional spacial coordinates from the projection images. One problem here is that the heart of a patient beats multiple times during the long rotation of the X-ray source and X-ray detector which typically takes 3 to 10 seconds. The movement of the heart results in major artifacts during the three-dimensional reconstruction of the structure data of the heart. Attempts have hitherto been made to solve this problem of an-giocardiography in that during the recording of the projection images the relevant phase of the heart movement is determined with the aid of an electrocardiograph Subsequently fewer 2004P01309 International Version 2 projection images are selected from the projection images re-corded during a complete rotation, said projection images dis-playing the heart in a still phase. This selection results in the substantial deterioration of both the spacial resolution and the contrast resolution of the three-dimensional structure data. Conversely, it is also possible to extract more projection 1m-) ages for obtaining the structure data but in this case, the temporary resolution deteriorates. The object of the invention is therefore, using this prior art as a starting point, to create a device with which structure data of a moving object can be obtained with a high spacial and time resolution. This object is achieved by means of a device with the features of the independent claim. Further advantageous embodiments and developments are set down in the dependent claims. In addition to a radiation source and a detector which move about the object along a measurement path, the device has an evaluation unit in which a modelator from the projection im-ages in various time frames determines an object model valid for the relevant time frame in each instance. A movement analyzer of the evaluation unit can then derive model projec-tion images with the aid of the object model, and determine movement fields for the projection images from the model projection images. A movement compensator in the evaluation unit is thus able to calculate movement-corrected projection images on the basis of the movement field, so that a recon-struction unit of the evaluation unit can finally determine the structure data of the object from the movement-corrected 2004P01309 International Version 3 ture data of the object from the movement-corrected projection images The concept behind the invention is that valuable movement in-formation can still be obtained from the object models calcu-lated from the modelator despite the poor local and contrast resolution. Then movement fields of the projection images can be estimated from the different object models assigned to the various time frames. This is possible in particular if the details of the moving object which initially do not appear in the structure object model, move in a similar manner to the associated roughly structured regions of the object to be ex-amined. A large number of recorded projection images can be used since, with the device for the reconstruction of the structure data, the structure data has an improved local and contrast resolution in comparison with the prior art. It is also pos-sible to achieve a high time resolution as the recorded pro-jection images can essentially be movement-corrected at each time point. In a preferred embodiment the object to be examined is a cy-clically moving object and the device has a movement sensor by means of which the phases of the cycle can be detected The movement correction is facilitated in this way, since the phases of the cycle do not have to be estimated from the re-corded projection images themselves. If the device is used within the context of angiocardiography for examining a moving heart, the movement sensor is prefera-bly an electrocardiograph. 2004P01309 International Version 4 In a further preferred embodiment, the evaluation unit of the device is designed for an iterative data reduction In this case, the reconstruction unit creates structure data sets as-signed to various time points and the movement analyzer deter-mines refined model projection images from the structure data sets, said model projection images serving to calculate move-ment fields arranged around addition details for the conven-tional projection images. The evaluation unit can repeat the data reduction as often as necessary until the calculated structure data sets only change slightly. Further features and advantages of the invention are set down in the description below, in which the exemplary embodiments of the invention are described in detail with reference to the accompanying drawing, in which: Figure 1 shows an angiography device for the three-dimensional rotation angiocardiography, Figure 2 depicts a logical function unit in an evaluation unit of the angiography device in Figure 1, Figure 3 shows a diagram displaying the temporal development of a projection angle of the angiography device and an electrocardiogram of an examined patient, Figure 4 shows a diagram in which the phase angle of recorded projection images is displayed in relation to the projection angle of the angiography device and the relative time of a heart cycle; Figure 5 shows a diagram illustrating the sequence of the data reduction carried out by the evaluation unit of the angiography device; 5 Figure 6 shows a diagram displaying the phase location of the originally recorded projection images and the phase angle of the movement-corrected projection images in relation to the projection angle of the angiography device and the relative time of a heart cycle. Figure 1 shows an angiography device 1 which serves to obtain structure data from a heart of a patient 2. This structure data can be a three-dimensional model of the heart of the pa-tient 2 The structure data can also be sections through the heart of the patient 2. Furthermore, the structure data can be obtained with or without time resolution The patient 2 typically lies on a table 3, which can be ro-tated by a C-arm 4. The C-arm 4 is attached to a support 5 which allows the C-arm 4 to rotate about the patient 2. Fur-thermore, the C-arm 4 has an X-ray source 6 and an X-ray de-tector 7, which serves to record projection images of the heart of the patient 2. The projection images generated by the X-ray detector 7 are supplied to an evaluation unit 8, which has an image processing unit 9 with connected image mememory 10 and an electrocardiograph 11 with a connected heart signal memory 12 The electrocardiograph 11 is connected to the pa-tient 2 by means of electrodes 13. Figure 2 shows logical function units of the image processing unit 9 The image processing unit 9 has a modelator 14 which generates heart models assigned in each instance to various time frames from the heart signal data stored in the heart signal memory 12 and from the projection images stored in the image memory 10 A movement analyzer 15 determines a series of movement fields with the aid of a model detected by the mode-lator 14, with the aid of which a movement compensator 16 cor- 2004P01309 International Version 6 rects the movement of the heart in the original projection im-ages A reconstruction unit 17 determines the structure data of the heart from the movement-corrected projection images from the movement compensator 16, said structure data being stored in a structure data memory 18. In a further iteration of the data reduction, the structure data generated by the re-construction unit 17 can be made available to the movement analyzer 15, from which it calculates refined movement fields. The function of the individual logical function units of the image processing unit 9 shown in Figure 2 is described below in detail. Figure 3 shows a movement diagram 19, in which the projection angle ? of the C-arm 4 is applied against the time t, whilst the C-arm 4 moves about the patient 2. The projection angle increases continuously with time based on the continual move-ment of the C-arm 4. Furthermore, Figure 3 contains an electrocardiogram 20 of a patient 2 The so-called R-jags 21 are clearly noticeable based on which it is possible to assign a heart cycle 23 of the heart of a patient 2 to a rotation status 22 of the C-arm 4 A heart cycle 23 extends in each instance from an R-jag 21 to the next R-jag 21 As the movement of the heart is cycli-cally repeated, a relative time trel can be assigned to the movement process of the heart within a cycle, said relative time assuming values between 0 and 1. It should be noted that the projection angle ? represents the whole set of position data, which completely describes the po-sition of the C-arm 4. 2004P01309 International Version 7 Figure 4 now displays a diagram, in which phase angles 24 of the projection images generated by the X-ray detector 7 are plotted in relation to the projection angle 0 and the relative time trel Figure 4 particularly displays the phase angles 24 of projec-tion images which lie in a time frame 25, which is centered on trel = 0 7 and has a width of ? = 0 . 2 . From the projection images which can be assigned to the time frame 25, the modela-tor 14 from Figure 2 now calculates a model for the heart of the patient 2, which is assigned to the relative time trel = 0,. This model generally suffers from a poor local and con-trast resolution In addition, the modelator 14 in further time frames 25 calcu-lates further models of the heart. The phase strips are therefore preferably centered on the relative times trel = 0.1/n, 2/n, 3/n . n-l/n and distributed equally over the heart cycle 23. A value A = 1/n or greater is chosen as the width of the time window 25, whereby the latter results in a time frame 25 to be overlapped. As a result, the modelator 14 generates a four-dimensional data set 25, as displayed in Figure 5, said data set having a plurality of models 27 of the heart assigned to various time points trel The movement analyzer 15 mentioned in relation to Figure 3 generates model projection images 28 at various projection an-gles ?, with the aid of model 27. To create the model projec-tion images 28, methods known to a person skilled in the art, for example referred to as DRR {digitally reconstructed radio-graph) or MIP (maximum intensity projection) are used. 2004P01309 International Version 8 A three-dimensional data set 29 is shown m Figure 5, which has model projection images 2 8 assigned to a specific projec-tion angle at various relative times trel The movement analyzer 15 now calculates movement fields 31 in an analysis process 30, said movement fields describing the movement of the image structures in the two-dimensional model projection images 28 In this way for example, search algo-rithms which are used in conjunction with the video coding can be accessed. After the movement fields 31 have been obtained, the movement compensator 16 performs a movement compensation of the type illustrated in Figure 6. Figure 6 displays phase angles 33 of projection images in a time frame 32, said phase angles being assigned to the time frame 32. The original phase angles 33 are conveyed to the corrected phase angles 34 with the aid of the movement compensator 16, so that each projection image corresponds to the associated corrected projection images which are recorded at a fixed time trel and at different pro-jection angles G. The generation of movement-compensated pro-jection images at time point trel = 0 7 is illustrated for ex-ample in Figure 4, said projection images being used whose phase angles 33 is located within a time frame 32 of the width A = 0.4. The projection images movement-compensated in this manner are finally fed to the reconstruction unit 17, which generates the structure data of the heart of a patient 2 from the movement-compensated projection images. As already mentioned, the structure data can also be three-dimensional models of the heart of a patient 2 associated with various relative times trel, from which the movement analyzer 2004P01309 International Version 9 15 can calculate refined movement fields 31, so that refined structure data sets result with an iteration of the method carried out by the evaluation unit 8, which can again be fed to the movement analyzer until the structure data sets no longer change or change only slightly It should be noted that the evaluation of the heart signal of the electrocardiograph 11 is not necessary in each case In fact, the heart cycles 23 can also be approximately estimated from the original projection images Furthermore, it should be noted that the device described here can essentially also be used for examining objects not moving cyclically. Finally please note that terms such as modelator, movement analyzer, movement compensator or reconstruction units are to be understood as functional. These logical units do not nec-essarily have to form physical units, but can also be realized in a physical unit in the form of software and conversely dis-tributed over a plurality of physical units 2004P01309 International Version 10 Claims 1. Device for obtaining structure data from a moving object with: - a radiation source (6) which can be moved about the object along a measurement path; - a detector (7) arranged on an opposite side of the object and which can be moved according to the movement of the ra-diation source (6), which generates projection images of the object; and - an evaluation unit (8), which calculates the structure data of the object from the projection images, characterized in that - a modelator (14} of the evaluation unit 8) determines an ob-ject model valid for the relevant time frame (25) from the projection images in different time frames (25), - a movement analyzer (15) of the evaluation unit (8) which obtains model projection images (28) based on the object models (27) and determines movement fields for the projec-tion images from the model projection images (28), - a movement compensator (16) in the evaluation unit (8) based on the movement field (31) calculates movement-corrected projection images, and - a reconstruction unit (17) in the evaluation unit (8) deter-mines the structure data of the object from the movement-corrected projection images. 2 Device according to Claim 1, characterized in that the device for examining a cyclically moving object (23) com-prises movement sensors (11, 13) for determining the cycles 3 Device according to Claim 2, characterized in that 2004P01309 International Version 11 the device for examining a moving heart comprises an electro-cardiograph (11) . 4 Device according to one of Claims 1 to 3, characterized in that, the evaluation unit (8) generates structure data sets associ-ated with a number of different movement segments, these being fed to the movement analyzer (15) which produces refined move-ment fields (31) from the structure data sets. 5 Device according to Claim 4, characterized in that the evaluation unit (8) generates refined structure data sets of the object, on the basis of the refined movement fields (31) 6 Device according to one of the Claims 1 to 5, characterized in that during the examination of an object moving in cycles (23), the evaluation unit (8) determines the cycles (23) based on the projection images supplied with the help of the detector (7). 7 Device according to one of Claims 1 to 6, characterized in that the radiation source is an X-ray source (6) and the detector is an X-ray detector (7) Dated this 29th day of MARCH 2005. Device for obtaining structure data of a moving object In addition to a radiation source (6) attached to a C-arm 4, and in addition to a detector (7) , a rotation angiography de-vice (1) for the angiocardiography has an evaluation unit (8), which formulates models with low resolution from the projec-tion images supplied by the detector (7) for the moving object to be examined, and which generates movement fields for the projection images generated by the detector (7) on the basis of the model, so that movement-corrected projection images can be calculated from the projection images, which can be used to formulate a three-dimensional high-resolution model of the ob-ject to be examined.

Full Text

2004P01309 International Version
1
Description
Device for obtaining structure data of a moving object
The invention relates to a device for obtaining structure dat of a moving object with
- a radiation source which can be moved about an object alone a measurement path,
- a detector arranged on the opposite side of the object and which can be moved according to the movement of the radia-tion source and,
- an evaluation unit which determines the structure data of the object from the projection images.
A device of this type is generally known from US 2002/0186871 Al and from the field of three-dimensional angiocardiography Three-dimensional structure data of the moving heart is ob-tained in rotation angiocardiography, in which an X-ray source and an X-ray detector rotates about the patient at an angular range greater than 180° and thus records projection images of the moving heart The structure data of the object can then essentially be determined in the form of three dimensional spacial coordinates from the projection images.
One problem here is that the heart of a patient beats multiple times during the long rotation of the X-ray source and X-ray detector which typically takes 3 to 10 seconds. The movement of the heart results in major artifacts during the three-dimensional reconstruction of the structure data of the heart.
Attempts have hitherto been made to solve this problem of an-giocardiography in that during the recording of the projection images the relevant phase of the heart movement is determined with the aid of an electrocardiograph Subsequently fewer

2004P01309 International Version
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projection images are selected from the projection images re-corded during a complete rotation, said projection images dis-playing the heart in a still phase.
This selection results in the substantial deterioration of
both the spacial resolution and the contrast resolution of the three-dimensional structure data.
Conversely, it is also possible to extract more projection 1m-) ages for obtaining the structure data but in this case, the temporary resolution deteriorates.
The object of the invention is therefore, using this prior art as a starting point, to create a device with which structure data of a moving object can be obtained with a high spacial and time resolution.
This object is achieved by means of a device with the features of the independent claim. Further advantageous embodiments and developments are set down in the dependent claims.
In addition to a radiation source and a detector which move about the object along a measurement path, the device has an evaluation unit in which a modelator from the projection im-ages in various time frames determines an object model valid for the relevant time frame in each instance. A movement analyzer of the evaluation unit can then derive model projec-tion images with the aid of the object model, and determine movement fields for the projection images from the model projection images. A movement compensator in the evaluation unit is thus able to calculate movement-corrected projection images on the basis of the movement field, so that a recon-struction unit of the evaluation unit can finally determine the structure data of the object from the movement-corrected

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ture data of the object from the movement-corrected projection images
The concept behind the invention is that valuable movement in-formation can still be obtained from the object models calcu-lated from the modelator despite the poor local and contrast resolution. Then movement fields of the projection images can be estimated from the different object models assigned to the various time frames. This is possible in particular if the details of the moving object which initially do not appear in the structure object model, move in a similar manner to the associated roughly structured regions of the object to be ex-amined.
A large number of recorded projection images can be used since, with the device for the reconstruction of the structure data, the structure data has an improved local and contrast resolution in comparison with the prior art. It is also pos-sible to achieve a high time resolution as the recorded pro-jection images can essentially be movement-corrected at each time point.
In a preferred embodiment the object to be examined is a cy-clically moving object and the device has a movement sensor by means of which the phases of the cycle can be detected The movement correction is facilitated in this way, since the phases of the cycle do not have to be estimated from the re-corded projection images themselves.
If the device is used within the context of angiocardiography for examining a moving heart, the movement sensor is prefera-bly an electrocardiograph.

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In a further preferred embodiment, the evaluation unit of the device is designed for an iterative data reduction In this case, the reconstruction unit creates structure data sets as-signed to various time points and the movement analyzer deter-mines refined model projection images from the structure data sets, said model projection images serving to calculate move-ment fields arranged around addition details for the conven-tional projection images. The evaluation unit can repeat the data reduction as often as necessary until the calculated structure data sets only change slightly.
Further features and advantages of the invention are set down in the description below, in which the exemplary embodiments of the invention are described in detail with reference to the accompanying drawing, in which:
Figure 1 shows an angiography device for the three-dimensional rotation angiocardiography,
Figure 2 depicts a logical function unit in an evaluation unit of the angiography device in Figure 1,
Figure 3 shows a diagram displaying the temporal development of a projection angle of the angiography device and an electrocardiogram of an examined patient,
Figure 4 shows a diagram in which the phase angle of recorded projection images is displayed in relation to the projection angle of the angiography device and the relative time of a heart cycle;
Figure 5 shows a diagram illustrating the sequence of the data reduction carried out by the evaluation unit of the angiography device;

5
Figure 6 shows a diagram displaying the phase location of the originally recorded projection images and the phase angle of the movement-corrected projection images in relation to the projection angle of the angiography device and the relative time of a heart cycle.
Figure 1 shows an angiography device 1 which serves to obtain structure data from a heart of a patient 2. This structure data can be a three-dimensional model of the heart of the pa-tient 2 The structure data can also be sections through the heart of the patient 2. Furthermore, the structure data can be obtained with or without time resolution
The patient 2 typically lies on a table 3, which can be ro-tated by a C-arm 4. The C-arm 4 is attached to a support 5 which allows the C-arm 4 to rotate about the patient 2. Fur-thermore, the C-arm 4 has an X-ray source 6 and an X-ray de-tector 7, which serves to record projection images of the heart of the patient 2. The projection images generated by the X-ray detector 7 are supplied to an evaluation unit 8, which has an image processing unit 9 with connected image mememory 10 and an electrocardiograph 11 with a connected heart signal memory 12 The electrocardiograph 11 is connected to the pa-tient 2 by means of electrodes 13.
Figure 2 shows logical function units of the image processing unit 9 The image processing unit 9 has a modelator 14 which generates heart models assigned in each instance to various time frames from the heart signal data stored in the heart signal memory 12 and from the projection images stored in the image memory 10 A movement analyzer 15 determines a series of movement fields with the aid of a model detected by the mode-lator 14, with the aid of which a movement compensator 16 cor-

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rects the movement of the heart in the original projection im-ages A reconstruction unit 17 determines the structure data of the heart from the movement-corrected projection images from the movement compensator 16, said structure data being stored in a structure data memory 18. In a further iteration of the data reduction, the structure data generated by the re-construction unit 17 can be made available to the movement analyzer 15, from which it calculates refined movement fields.
The function of the individual logical function units of the image processing unit 9 shown in Figure 2 is described below
in detail.
Figure 3 shows a movement diagram 19, in which the projection angle ? of the C-arm 4 is applied against the time t, whilst the C-arm 4 moves about the patient 2. The projection angle increases continuously with time based on the continual move-ment of the C-arm 4.
Furthermore, Figure 3 contains an electrocardiogram 20 of a patient 2 The so-called R-jags 21 are clearly noticeable based on which it is possible to assign a heart cycle 23 of the heart of a patient 2 to a rotation status 22 of the C-arm 4 A heart cycle 23 extends in each instance from an R-jag 21 to the next R-jag 21 As the movement of the heart is cycli-cally repeated, a relative time trel can be assigned to the movement process of the heart within a cycle, said relative time assuming values between 0 and 1.
It should be noted that the projection angle ? represents the whole set of position data, which completely describes the po-sition of the C-arm 4.

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Figure 4 now displays a diagram, in which phase angles 24 of the projection images generated by the X-ray detector 7 are plotted in relation to the projection angle 0 and the relative time trel
Figure 4 particularly displays the phase angles 24 of projec-tion images which lie in a time frame 25, which is centered on trel = 0 7 and has a width of ? = 0 . 2 . From the projection images which can be assigned to the time frame 25, the modela-tor 14 from Figure 2 now calculates a model for the heart of the patient 2, which is assigned to the relative time trel = 0,. This model generally suffers from a poor local and con-trast resolution
In addition, the modelator 14 in further time frames 25 calcu-lates further models of the heart. The phase strips are therefore preferably centered on the relative times trel = 0.1/n, 2/n, 3/n . n-l/n and distributed equally over the heart cycle 23. A value A = 1/n or greater is chosen as the width of the time window 25, whereby the latter results in a time frame 25 to be overlapped.
As a result, the modelator 14 generates a four-dimensional
data set 25, as displayed in Figure 5, said data set having a
plurality of models 27 of the heart assigned to various time
points trel
The movement analyzer 15 mentioned in relation to Figure 3 generates model projection images 28 at various projection an-gles ?, with the aid of model 27. To create the model projec-tion images 28, methods known to a person skilled in the art, for example referred to as DRR {digitally reconstructed radio-graph) or MIP (maximum intensity projection) are used.

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A three-dimensional data set 29 is shown m Figure 5, which has model projection images 2 8 assigned to a specific projec-tion angle at various relative times trel
The movement analyzer 15 now calculates movement fields 31 in an analysis process 30, said movement fields describing the movement of the image structures in the two-dimensional model projection images 28 In this way for example, search algo-rithms which are used in conjunction with the video coding can be accessed.
After the movement fields 31 have been obtained, the movement compensator 16 performs a movement compensation of the type illustrated in Figure 6. Figure 6 displays phase angles 33 of projection images in a time frame 32, said phase angles being assigned to the time frame 32. The original phase angles 33 are conveyed to the corrected phase angles 34 with the aid of the movement compensator 16, so that each projection image corresponds to the associated corrected projection images which are recorded at a fixed time trel and at different pro-jection angles G. The generation of movement-compensated pro-jection images at time point trel = 0 7 is illustrated for ex-ample in Figure 4, said projection images being used whose phase angles 33 is located within a time frame 32 of the width A = 0.4.
The projection images movement-compensated in this manner are finally fed to the reconstruction unit 17, which generates the structure data of the heart of a patient 2 from the movement-compensated projection images.
As already mentioned, the structure data can also be three-dimensional models of the heart of a patient 2 associated with various relative times trel, from which the movement analyzer

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15 can calculate refined movement fields 31, so that refined structure data sets result with an iteration of the method carried out by the evaluation unit 8, which can again be fed to the movement analyzer until the structure data sets no longer change or change only slightly
It should be noted that the evaluation of the heart signal of the electrocardiograph 11 is not necessary in each case In fact, the heart cycles 23 can also be approximately estimated from the original projection images
Furthermore, it should be noted that the device described here can essentially also be used for examining objects not moving cyclically.
Finally please note that terms such as modelator, movement analyzer, movement compensator or reconstruction units are to be understood as functional. These logical units do not nec-essarily have to form physical units, but can also be realized in a physical unit in the form of software and conversely dis-tributed over a plurality of physical units

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Claims
1. Device for obtaining structure data from a moving object with:
- a radiation source (6) which can be moved about the object
along a measurement path;
- a detector (7) arranged on an opposite side of the object and which can be moved according to the movement of the ra-diation source (6), which generates projection images of the object; and
- an evaluation unit (8), which calculates the structure data of the object from the projection images,
characterized in that
- a modelator (14} of the evaluation unit 8) determines an ob-ject model valid for the relevant time frame (25) from the projection images in different time frames (25),
- a movement analyzer (15) of the evaluation unit (8) which obtains model projection images (28) based on the object models (27) and determines movement fields for the projec-tion images from the model projection images (28),
- a movement compensator (16) in the evaluation unit (8) based on the movement field (31) calculates movement-corrected projection images, and
- a reconstruction unit (17) in the evaluation unit (8) deter-mines the structure data of the object from the movement-corrected projection images.
2 Device according to Claim 1,
characterized in that
the device for examining a cyclically moving object (23) com-prises movement sensors (11, 13) for determining the cycles
3 Device according to Claim 2,
characterized in that

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the device for examining a moving heart comprises an electro-cardiograph (11) .
4 Device according to one of Claims 1 to 3,
characterized in that,
the evaluation unit (8) generates structure data sets associ-ated with a number of different movement segments, these being fed to the movement analyzer (15) which produces refined move-ment fields (31) from the structure data sets.
5 Device according to Claim 4,
characterized in that
the evaluation unit (8) generates refined structure data sets of the object, on the basis of the refined movement fields (31)
6 Device according to one of the Claims 1 to 5,
characterized in that
during the examination of an object moving in cycles (23), the evaluation unit (8) determines the cycles (23) based on the projection images supplied with the help of the detector (7).
7 Device according to one of Claims 1 to 6,
characterized in that
the radiation source is an X-ray source (6) and the detector is an X-ray detector (7)
Dated this 29th day of MARCH 2005.
Device for obtaining structure data of a moving object
In addition to a radiation source (6) attached to a C-arm 4, and in addition to a detector (7) , a rotation angiography de-vice (1) for the angiocardiography has an evaluation unit (8), which formulates models with low resolution from the projec-tion images supplied by the detector (7) for the moving object to be examined, and which generates movement fields for the projection images generated by the detector (7) on the basis of the model, so that movement-corrected projection images can be calculated from the projection images, which can be used to formulate a three-dimensional high-resolution model of the ob-ject to be examined.

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Patent Number

278103

Indian Patent Application Number

241/KOL/2005

PG Journal Number

52/2016

Publication Date

16-Dec-2016

Grant Date

14-Dec-2016

Date of Filing

29-Mar-2005

Name of Patentee

SIEMENS AKTIENGESELLSCHAFT

Applicant Address

WITTELSBACHERPLATZ 2, 80333 MUNCHEN

Inventors:

#	Inventor's Name	Inventor's Address
1	JAN BOESE	MOSELSTR 10, 90542 ECKENTAL

PCT International Classification Number

N/A

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	102004017478.4	2004-04-08	Germany