초록 ▼

This invention relates to a system that adaptively compensates for subject motion in real-time in an imaging system. An object orientation marker (30), preferably a retro-grate reflector (RGR), is placed on the head or other body organ of interest of a patient (P) during a scan, such as an MRI scan.

This invention relates to a system that adaptively compensates for subject motion in real-time in an imaging system. An object orientation marker (30), preferably a retro-grate reflector (RGR), is placed on the head or other body organ of interest of a patient (P) during a scan, such as an MRI scan. The marker (30) makes it possible to measure the six degrees of freedom (x, y, and z-translations, and pitch, yaw, and roll), or “pose”, required to track motion of the organ of interest. A detector, preferably a camera (40), observes the marker (30) and continuously extracts its pose. The pose from the camera (40) is sent to the scanner (120) via an RGR processing computer (50) and a scanner control and processing computer (100), allowing for continuous correction of scan planes and position (in real-time) for motion of the patient (P). This invention also provides for internal calibration and for co-registration over time of the scanner's and tracking system's reference frames to compensate for drift and other inaccuracies that may arise over time.

대표청구항 ▼

1. A motion tracking system for an object in a magnetic resonance imaging scanner, the system comprising: an object orientation marker configured to be coupled to the object;at least two detectors configured to periodically image the object orientation marker, the at least two detectors each configu

1. A motion tracking system for an object in a magnetic resonance imaging scanner, the system comprising: an object orientation marker configured to be coupled to the object;at least two detectors configured to periodically image the object orientation marker, the at least two detectors each configured to view the object orientation marker along a different line of sight; anda tracking system configured to analyze images generated by the at least two detectors to determine changes in position of the object orientation marker, and to generate tracking data for use by the magnetic resonance imaging scanner to dynamically adjust scans to compensate for the changes in position of the object orientation marker;wherein the tracking system comprises a computer processor and an electronic memory. 2. The motion tracking system of claim 1, wherein the tracking system is further configured to predict changes in position of the object orientation marker by analyzing a plurality of previously determined changes in position of the object orientation marker. 3. The motion tracking system of claim 1, wherein each of the at least two detectors comprises a camera. 4. The motion tracking system of claim 1, wherein the object orientation marker indicates orientation in at least three degrees of freedom. 5. The motion tracking system of claim 1, wherein the object orientation marker indicates orientation in six degrees of freedom. 6. The motion tracking system of claim 1, wherein the object orientation marker is an RGR. 7. The motion tracking system of claim 1, wherein at least one of the at least two detectors is configured to be positioned within the magnetic resonance imaging scanner. 8. The motion tracking system of claim 1, wherein each of the at least two detectors is configured to be positioned within the magnetic resonance imaging scanner. 9. The motion tracking system of claim 1, further comprising at least one mirror configured to provide an indirect line of sight between the object orientation marker and at least one of the at least two detectors. 10. The motion tracking system of claim 1, wherein the at least two detectors are configured to be positioned to enable at least one detector to view the object orientation marker when the sight line from another detector to the object orientation marker is obstructed. 11. A motion tracking system for an object in a scanner, the system comprising: an object orientation marker configured to be coupled to the object;a scanner configured to scan the object;at least two detectors configured to periodically image the object orientation marker, the at least two detectors each configured to view the object orientation marker along a different line of sight; anda tracking system configured to analyze images generated by the at least two detectors to determine changes in position of the object orientation marker, and to generate tracking data for use by the scanner to dynamically adjust scans to compensate for the changes in position of the object orientation marker;wherein the tracking system comprises a computer processor and an electronic memory. 12. The motion tracking system of claim 11, wherein the scanner is one of a MR scanner, a PET scanner, a SPECT scanner, a CT scanner, and a digital angiographic scanner. 13. The motion tracking system of claim 11, wherein the tracking system is further configured to predict changes in position of the object orientation marker by analyzing a plurality of previously determined changes in position of the object orientation marker. 14. The motion tracking system of claim 11, wherein each of the at least two detectors comprises a camera. 15. The motion tracking system of claim 11, wherein the object orientation marker indicates orientation in at least three degrees of freedom. 16. The motion tracking system of claim 11, wherein the object orientation marker indicates orientation in six degrees of freedom. 17. The motion tracking system of claim 11, wherein the object orientation marker is an RGR. 18. The motion tracking system of claim 11, wherein at least one of the at least two detectors is configured to be positioned within the scanner. 19. The motion tracking system of claim 11, wherein each of the at least two detectors is configured to be positioned within scanner. 20. The motion tracking system of claim 11, wherein the at least two detectors are configured to be positioned to enable at least one detector to view the object orientation marker when the sight line from another detector to the object orientation marker is obstructed.