Granted Patent B2

US 8,121,245 · App. 12/930,856 · Granted Feb 21, 2012

Assignee: The University of Chicago

Abstract

Claims (45)

1. A method of imaging at least a part of a region of interest (ROI) comprising:

moving a source relative to the ROI in a trajectory;

collecting data from at least one sensor as the source moves relative to the ROI; and

generating a reconstruction of the ROI based on the data collected,

wherein the reconstruction is derived from a mathematically exact transformation from data space into image space;

wherein generating the reconstruction is using only a subset of the data collected;

wherein the ROI exhibits periodic motion with an object temporal cycle; and

wherein the source moves relative to the ROI such that the source trajectory motion is not synchronized with the object temporal cycle.

2. The method of claim 1 , wherein the trajectory is confined to 2-dimensions; and

wherein the trajectory is less than 360°.

3. The method of claim 1 , wherein the trajectory is in 3-dimensions; and

wherein the trajectory is less than 360° in 2 of the 3-dimensions.

4. The method of claim 1 , wherein the subset of the data collected comprises a short-scan data set.

5. The method of claim 1 , wherein the subset of the data collected comprises a reduced-scan data set.

6. The method of claim 1 , wherein the subset of the data collected comprises truncated data.

7. The method of claim 1 , wherein the subset of the data collected comprises retrospectively gated angular reconstruction intervals.

8. The method of claim 7 , wherein the retrospectively gated angular reconstruction intervals are selected with respect to the object temporal cycle.

9. The method of claim 1 , wherein the at least a part of a ROI is located at a position proximate to the source trajectory.

10. The method of claim 1 , wherein the source trajectory is circular and the ROI is positioned off-center with respect to the center of the circular source trajectory.

11. The method of claim 9 , wherein the source trajectory is helical and the ROI is positioned off-center with respect to the center of the helical source trajectory.

12. The method of claim 9 , wherein the source trajectory is a non-closed bracket and the ROI is positioned off-center with respect to the center of the non-closed bracket source trajectory.

13. The method of claim 9 , wherein the source trajectory is non-continuous and the ROI is positioned off-center with respect to the center of the source trajectory.

14. The method of claim 1 , wherein the subset of the data collected comprises at least one of a short-scan data set, a reduced-scan data set, truncated data, or retrospectively gated angular reconstruction intervals.

15. A method of imaging at least a part of a region of interest (ROI) comprising:

moving a source relative to the ROI in a trajectory, the ROI is located at a position proximate to the trajectory and off-center with respect to a center of the trajectory;

collecting data from at least one sensor as the source moves relative to the ROI along at least a part of the trajectory; and

generating a reconstruction of the ROI using the data collected,

wherein the reconstruction is derived from a mathematically exact transformation from data space into image space; and

wherein the data used to generate the reconstruction of the ROI is a subset of the data collected which is selected to reduce motion contamination in the reconstructed images.

16. The method of claim 15 , wherein the motion contamination is due to periodic object motion in the ROI.

17. The method of claim 15 , wherein the motion contamination is due to aperiodic object motion in the ROI.

18. A system for imaging at least a part of a region of interest (ROI) comprising:

at least one memory;

at least one source of radiation;

at least one sensor; and

at least one controller in communication with the at least one memory, the at least one source of radiation, and the at least one sensor, the controller configured to

control movement of the at least one source relative to the ROI in a trajectory;

receive data from the at least one sensor, the data being generated by the at least one sensor as the at least one source moves relative to the ROI; and

use a mathematically exact transformation from data space of at least a part of the data received into image space in order to generate a reconstruction of the ROI,

wherein the ROI exhibits periodic motion with an object temporal cycle, and

wherein the source moves relative to the ROI such that the source trajectory motion is asynchronous with the object temporal cycle.

19. The system of claim 18 , wherein the controller is configured to use only a subset of the data received in order to generate the reconstruction.

20. The system of claim 19 , wherein the subset of the data received comprises at least one of a short-scan data set, a reduced-scan data set, truncated data, or retrospectively gated angular reconstruction intervals.

21. The system of claim 18 , wherein the subset of the data collected comprises retrospectively gated angular reconstruction intervals; and

wherein the retrospectively gated angular reconstruction intervals are selected with respect to the object temporal cycle.

Continuity (8)