Protocol driven image reconstruction, display, and processing in a multislice imaging system

• US 6,141,398 A
• Filed: 08/25/1998
• Issued: 10/31/2000
• Est. Priority Date: 08/25/1998
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: He, Hui David, Fox, Stanley H., Ackelsberg, Sholom M.
• Primary Examiner(s): BRUCE, DAVID VERNON
• Application Number:
  US09/139,438
• Time in Patent Office: 798 Days
• Field of Search: 378/4, 378/8, 378/15, 378/62, 378/901
• US Class Current: 378/4
• CPC Class Codes: A61B 6/027 characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/4085 Cone-beams
• CPC Class Codes: A61B 6/504 for diagnosis of blood vessels, e.g. by angiography
• CPC Class Codes: Y10S 378/901 Computer tomography program or processor

Abstract

A scalable multislice system configured to generate multiple streams of image data with different image quality characteristics prospectively and simultaneously is described. Such capability enables improving existing clinical diagnosis and also enables use of clinical application protocol driven method for image reconstruction and display as well as image analysis. More specifically, with the scalable multislice imaging system, multiple rows (>2) of x-ray scan data along the patient'"'"'s long axis are simultaneously acquired. Multiple protocols are "pre-built" based on specific applications to determine image slice thickness, image reconstruction filter, display method, e.g., field of view, filming requirement and image archiving requirement, prospectively. Multiple image sets with different slice thickness, different reconstruction methods, different display model--axial, 3D or reformat which are pre-determined by the protocol used can then be displayed.

Claims

1. A protocol for defining operations performed by a multislice imaging system, said protocol comprising designations for at least one of slice thickness, image reconstruction filter, display method, filming requirement and image archiving requirement, and further including designations for reconstruction of images from multiple rows of scan data, the reconstructed images having thicknesses varying in accordance with a resolution requirement.

2. A protocol in accordance with claim 1 wherein said protocol designates at least one of CT neuro imaging, CT angiography, renal donor survey, pulmonary embolism, CT trauma imaging, whole body CT survey, and lung disease screening.

3. A protocol in accordance with claim 1 wherein said designations for reconstruction of images having varying thicknesses include designations for retrospective reconstruction of images.

4. A protocol in accordance with claim 3 wherein said protocol includes an image archiving requirement, and said image archiving requirement includes archival of images of a scanned portion of a patient anatomy as images having different thicknesses at different locations of the patient anatomy in accordance with a resolution requirement, to reduce a number of images to be archived.

5. A protocol in accordance with claim 1 wherein said protocol designates an axial image display mode, weighting multiple ultra thin slice cross sectional images, and generating an image with a desired slice thickness.

6. A protocol in accordance with claim 5 wherein said image is generated in accordance with:

space="preserve" listing-type="equation">I(x,y).sub.s =Σ

W.sub.i *I(x,y).sub.i

where I(x,y)_s is the resulted image pixel values at location x and y, W_i is the weighting factor determined by the final image slice thickness and sub-slice image thickness, and I(x,y)_i is the pixel values at x and y for the sub-slice images.

7. A protocol in accordance with claim 1 wherein said protocol designates a head trauma study and comprises instructions for:

acquiring axial scan data sets;

preprocessing raw scan data;

reconstructing sets of cross-sectional images with different slice thickness for different portions of the head; and

displaying the image sets simultaneously.

8. A multislice imaging system programmed to execute a scan in accordance with a protocol, said protocol comprising designations for at least one of slice thickness, image reconstruction filter, display method, filming requirement, and image archiving requirement, and further including designations for reconstruction of images from multiple rows of scan data, the reconstructed images having thicknesses varying in accordance with a resolution requirement.

9. A system in accordance with claim 8 wherein said designations for reconstruction of images having varying thicknesses include designations for retrospective reconstruction of images.

10. A system in accordance with claim 9 wherein said system includes an image archiving requirement, and said image archiving requirement includes archival of images of a scanned portion of a patient anatomy as images having different thicknesses at different locations of the patient anatomy in accordance with a resolution requirement, to reduce a number of images to be archived.

11. A system in accordance with claim 8 wherein said protocol designates a head trauma study and comprises instructions for:

acquiring axial scan data sets;

preprocessing raw scan data;

reconstructing sets of cross-sectional images with different slice thickness for different portions of the head; and

displaying the image sets simultaneously.

12. A system in accordance with claim, 8 wherein said protocol designates an axial image display mode, weighting multiple ultra thin slice cross sectional images, and generating an image with a desired slice thickness.

13. A system in accordance with claim 12 wherein said image is generated in accordance with:

space="preserve" listing-type="equation">I(x,y).sub.s =Σ

W.sub.i *I(x,y).sub.i

where I(x,y)_s is the resulted image pixel values at location x and y, W_i is the weighting factor determined by the final image slice thickness and sub-slice image thickness, and I(x,y)_i is the pixel values at x and y for the sub-slice images.

14. A system in accordance with claim 8 wherein said protocol designates at least one of CT neuro imaging, CT angiography, renal donor survey, pulmonary embolism, CT trauma imaging, whole body CT survey, and lung disease screening.

15. A multislice imaging system programmed to generate an image in accordance with:

space="preserve" listing-type="equation">I(x,y).sub.s =Σ

W.sub.i *I(x,y).sub.i

where I(x,y)_s is the resulted image pixel values at location x and y, W_i is the weighting factor determined by the final image slice thickness and sub-slice image thickness, and I(x,y)_i is the pixel values at x and y for the sub-slice images, and to perform a scan in accordance with a predefined protocol designating at least one of slice thickness, image reconstruction filter, display method, filming requirement, and image archiving requirement, and further including designations for reconstruction of images from multiple rows of scan data, the reconstructed images having thicknesses varying in accordance with a resolution requirement.

16. A system in accordance with claim 15 configured to acquire and pre-process multiple rows of raw scan data, and to generate, from the scan data, multiple streams of images having different image quality characteristics prospectively.

17. An system in accordance with claim 16 configured to prospectively generate image slices from the scan data having a first thickness, and to retrospectively generate image slices from the same scan data having a second thickness less than the first thickness.

18. A system in accordance with claim 15 wherein said protocol designates a head trauma study and comprises instructions for:

acquiring axial scan data sets;

preprocessing raw scan data;

reconstructing sets of cross-sectional images with different slice thickness for different portions of the head; and

displaying the image sets simultaneously.

19. A system in accordance with claim 15 wherein said protocol designates an axial image display mode, weighting multiple ultra thin slice cross sectional images, and generating an image with a desired slice thickness.

20. A system in accordance with claim 15 wherein said protocol designates at least one of CT neuro imaging, CT angiography, renal donor survey, pulmonary embolism, CT trauma imaging, whole body CT survey, and lung disease screening.

21. A system in accordance with claim 15 wherein said designations for reconstruction of images having varying thicknesses include designations for retrospective reconstruction of images.

22. A system in accordance with claim 21 wherein said protocol includes an image archiving requirement, and said image archiving requirement includes archival of images of a scanned portion of a patient anatomy as images having different thicknesses at different locations of the patient anatomy in accordance with a resolution requirement, to reduce a number of images to be archived.

23. A protocol for defining operations performed by an imaging system, said protocol comprising designations for at least one of slice thickness, image reconstruction filter, display method, filming requirement and image archiving requirement wherein said protocol designates CT angiography and comprises instructions for:

acquiring a helical scan data set;

preprocessing raw scan data;

reconstructing sets of images, prospectively; and

displaying images.

24. A multislice imaging system programmed to execute a scan in accordance with a protocol, said protocol comprising designations for at least one of slice thickness, image reconstruction filter, display method, filming requirement and image archiving requirement wherein said protocol designates CT angiography and comprises instructions for:

acquiring a helical scan data set;

preprocessing raw scan data;

reconstructing sets of images, prospectively; and

displaying images.

25. A multislice imaging system programmed to generate an image in accordance with