Method and Apparatus for Auto-Calibration of a Ct Scanner
AssigneeVarian Medical Systems Technologies, Inc.
InventorKevin M. Holt
Life of this patent
Estimating the term…
Abstract
A method of and apparatus for automatically calibrating a computed tomography (“CT”) scanning system (100)<is provided including providing (405) a calibration object (130) substantially centered on a translating table (120) for passing through the CT system (100). The system (100) scans (410) the calibration object (130) and provides (420) a preliminary representation such as a display (500) of a sorted sinogram of the object (130). From that preliminary representation, the system (100) determines intercept-related and/or slope-related values for at least a portion (510, 520, 530 or 540) of the preliminary representation and uses these values to calculate (440) one or more predetermined calibrations values.
Claims25
A method of automatically calibrating a computed tomography (“CT”) scanning system comprising:
- providing a calibration object substantially centered on a translating table for passing through the CT scanning system;
- scanning the calibration object;
- providing a preliminary representation of the calibration object;
- determining an intercept-related value for at least a portion of the preliminary representation of the calibration object;
- and
- calculating in an automatic calibrator a predetermined calibration value using the intercept-related value.
A method of automatically calibrating a computed tomography (“CT”) scanning system comprising:
- providing a calibration object substantially centered on a translating table for passing through the CT scanning system;
- scanning the calibration object;
- providing a preliminary representation of the calibration object;
- determining a slope-related value for at least a portion of the preliminary representation of the calibration object;
- and
- calculating in an automatic calibrator a predetermined calibration value using the slope-related value.
An computed tomography (“CT”) scanning system comprising:
- an X-ray source;
- a detector opposite the X-ray source;
- a translating table capable of moving an object between the X-ray source and the detector;
- a data collector operably coupled to the detector for collecting data from the detector;
- a memory circuit storing values regarding the CT scanning system;
- a processor circuit associated with the data collector and the memory circuit for calculating a source-to-object distance and a backlash value for the scanning system according to a predetermined function of the data and the values regarding the CT scanning system.
Dependencies are inferred from the claim text.