System for image scanning and acquisition with low-dose radiation

• US 8,971,493 B2
• Filed: 04/05/2011
• Issued: 03/03/2015
• Est. Priority Date: 09/08/2010
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Inventors: Zhang, Hongxuan
• Primary Examiner(s): Midkiff, Anastasia
• Application Number:
  US13/079,999
• Publication Number:
  US 20120057674A1
• Time in Patent Office: 1,428 Days
• Field of Search: 378/8, 378/20, 378/91, 378/95, 378/147, 378149-153, 378/157, 378/158, 378/204, 378/205, 378/210, 378/901, 378/62, 378/63, 378/165, 382/128, 382130-132, 600/301, 600/425, 600/428, 600/481, 600/484, 600/485, 600/508, 600/509, 600/521, 600/523, 600/529, 600/561
• US Class Current: 378/95
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/7285 for synchronising or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal A61B6/5205, A61B6/541, A61B8/5207, A61B8/543 take precedence
• CPC Class Codes: A61B 6/06 Diaphragms
• CPC Class Codes: A61B 6/4035 the source being combined with a filter or grating
• CPC Class Codes: A61B 6/469 for selecting a region of interest [ROI]
• CPC Class Codes: A61B 6/503 for diagnosis of the heart
• CPC Class Codes: A61B 6/507 for determination of haemodynamic parameters, e.g. perfusion CT
• CPC Class Codes: A61B 6/541 involving acquisition triggered by a physiological signal
• CPC Class Codes: A61B 6/542 involving control of exposure
• CPC Class Codes: Y10S 378/901 Computer tomography program or processor

Abstract

A medical imaging system adaptively acquires anatomical images using a shape adaptive collimator including multiple different portions of X-ray absorbent material automatically adjustable to alter the dimensions of a spatial cross section of an X-ray beam of radiation into a non-rectangular shape, in response to a control signal. The synchronization processor provides a heart rate related synchronization signal derived from a patient cardiac function related parameter. The synchronization signal enables adaptive variation in timing of image acquisition within an individual heart cycle and between successive heart cycles of each individual image frame of multiple sequential image frames. The X-ray image acquisition device uses the shape adaptive collimator for acquiring anatomical images of the region of interest with reduced patient X-ray exposure in response to the synchronization signal. A display processor presents resultant images.

Claims

1. A medical imaging system for adaptively acquiring anatomical images, comprising:

a programmable image radiation filter and a shape adaptive collimator including a plurality of different portions of X-ray absorbent material automatically adjustable to alter the dimensions of a spatial cross section of an X-ray beam of radiation into a non-rectangular shape, in response to a first control signal indicating shape of a region of interest of patient anatomy, wherein the programmable image radiation filter and the shape adaptive collimator are configured to provide a non-uniform image radiation exposure by adjusting X-ray beam shape, focus and intensity;

the shape adaptive collimator adaptively configured to simultaneously provide a high radiation dose to a first area within the region of interest and a low radiation dose to a second area within the region of interest;

a synchronization processor for providing a heart rate related synchronization signal derived from a patient cardiac function related parameter, said synchronization signal enabling adaptive variation in timing of image acquisition within an individual heart cycle and between successive heart cycles of each individual image frame of a plurality of sequential image frames;

an X-ray image acquisition device using said shape adaptive collimator for acquiring anatomical images of said region of interest with reduced patient X-ray exposure in response to said synchronization signal; and

a display processor for presenting images, acquired by said acquisition device to a user on a reproduction device.

2. The system according to claim 1, wherein said shape adaptive collimator employs at least three separately and relatively movable parts with at least two parts being mutually angularly adjustable to adapt said collimator to alter the dimensions of a spatial cross section of said X-ray beam to an irregular shape.

3. The system according to claim 1, the programmable image radiation filter including at least one portion of X-ray filtering material automatically adjustable to attenuate X-ray radiation in response to a second control signal.

4. The system according to claim 3, including a controller for generating the first and second control signals in response to user data entry indicating, (a) a region of interest of patient anatomy and (b) a cardiac function to be investigated.

5. The system according to claim 4, wherein said controller automatically adjusts the position of said portion of X-ray absorbent material and said X-ray filtering material in response to said first and second control signals.

6. The system according to claim 1, wherein said display processor provides at least one display image enabling a user to enter data indicating a shape of a region of interest of patient anatomy using an image of the patient anatomy.

7. The system according to claim 1, wherein said image acquisition device adaptively selects image pixel resolution of individual image frames of said plurality of sequential image frames in response to data identifying a heart cycle segment so that successively acquired image frames have different image pixel resolution within a single heart cycle.

8. The system according to claim 1, wherein said heart rate related synchronization signal comprises a signal synchronized with end-diastolic pressure in a cardiac cycle.

9. The system according to claim 8, wherein the end-diastolic pressure synchronized signal is derived from at least one of a non-invasive blood pressure monitoring device and ECG signal.

10. The system according to claim 8, wherein the end-diastolic pressure synchronized signal is derived from a blood oxygen saturation (SpO2) monitoring device.

11. The system according to claim 1, wherein said heart rate related synchronization signal comprises a signal synchronized with end-systolic pressure in a cardiac cycle.

12. The system according to claim 11, wherein the end-systolic pressure synchronized signal is derived from a non-invasive blood pressure monitoring device.

13. The system according to claim 1, wherein said patient cardiac function related parameter is a blood flow related parameter, and said blood flow related parameter indicates at least one of, (a) invasive blood pressure, (b) non-invasive blood pressure, (c) blood flow velocity, (d) blood flow acceleration and (e) blood flow frequency.

14. The system according to claim 13, wherein said patient blood flow related parameter is a blood pressure gradient indicator.

15. The system according to claim 1, including an image processor for calculating at least one of maximum left ventricle volume and minimum left ventricle volume based on acquired image data.

16. A method employed by a medical imaging system for adaptively acquiring anatomical images, the method comprising:

automatically adjusting dimensions of a spatial cross section of an X-ray beam of radiation into a non-rectangular shape using a programmable image radiation filter and a shape adaptive collimator, in response to a first control signal indicating shape of a region of interest of patient anatomy, said shape adaptive collimator including a plurality of automatically movable different portions of X-ray absorbent material, wherein the programmable image radiation filter and the shape adaptive collimator are configured to provide a non-uniform image radiation exposure by adjusting X-ray beam shape, focus and intensity;

simultaneously providing a high radiation dose to a first area within a region of interest and a low radiation dose to a second area within the region of interest;

automatically generating a heart rate related synchronization signal derived from a patient cardiac function related parameter, said synchronization signal enabling adaptive variation in timing of image acquisition within an individual heart cycle and between successive heart cycles of each individual image frame of a plurality of sequential image frames;

adaptively varying timing of acquiring anatomical images of said region of interest with reduced patient X-ray exposure using an adjusted X-ray beam of radiation having a non-rectangular shape in response to said synchronization signal; and

presenting acquired anatomical images on a reproduction device.

17. The method according to claim 16, wherein adaptively adjusting at least three separately and relatively movable parts with at least two parts being mutually angularly adjustable to adapt said shape adaptive collimator to alter the dimensions of a spatial cross section of said X-ray beam to an irregular shape.

18. The method according to claim 16, including the step of automatically adjusting programmable image radiation filter including at least one portion of X-ray filtering material to attenuate X-ray radiation in response to a second control signal.

19. A method employed by a medical imaging system for adaptively acquiring anatomical images, the method comprising:

automatically adjusting dimensions of a spatial cross section of an X-ray beam of radiation in response to a first control signal;

automatically adjusting a shape adaptive collimator and a programmable image radiation filter including at least one portion of X-ray filtering material to attenuate X-ray radiation in response to a second control signal, wherein the programmable image radiation filter is configured to provide a non-uniform image radiation exposure by adjusting X-ray beam shape, focus and intensity;

automatically generating a heart rate related synchronization signal derived from a patient cardiac function related parameter, said synchronization signal enabling adaptive variation in timing of image acquisition within an individual heart cycle and between successive heart cycles of each individual image frame of a plurality of sequential image frames;

simultaneously providing a high radiation dose to a first area within a region of interest and a low radiation dose to a second area within the region of interest;

adaptively varying timing of acquiring anatomical images of said region of interest with reduced patient X-ray exposure using an adjusted cross section X-ray beam of radiation attenuated by the programmable image radiation filter in response to said synchronization signal; and

presenting acquired anatomical images on a reproduction device.

20. The method according to claim 19, including the step of automatically adjusting dimensions of a spatial cross section of an X-ray beam of radiation into a non-rectangular shape using the shape adaptive collimator, in response to said first control signal indicating shape of a region of interest of patient anatomy, said shape adaptive collimator including a plurality of automatically movable different portions of X-ray absorbent material, wherein the shape adaptive collimator is configured to contribute to providing the non-uniform image radiation exposure by further adjusting X-ray beam shape, focus and intensity.

21. The method according to claim 20, including the step of adaptively adjusting at least three separately and relatively movable parts with at least two parts being mutually angularly adjustable to adapt said shape adaptive collimator to alter the dimensions of said spatial cross section of said X-ray beam to an irregular shape.