Method and apparatus for correcting a retained image artifact
AssigneeGeneral Electric Company
InventorsBrian David Yanoff, Douglas Albagli
Life of this patent
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Abstract
A technique for compensating for a retained image includes employing bimodal readout of alternating light and dark images. The bimodal readout technique results from reading either light or dark frames more rapidly, allowing additional time to be allocated to the X-ray exposures occurring prior to the light frames or to the other reading operation. The bimodal readout may be accomplished by a binning procedure by which scan lines are binned and read, typically during dark frame readout. The images acquired from reading the dark frames may then be used to compensate for a retained image artifacts present in the image derived from light frames.
Claims21
A method for compensating for image retention in a digital imaging system, the method comprising the steps of:
- acquiring two or more dark frames of a first duration following a primary exposure event, wherein each dark frame is followed by a secondary exposure event;
- acquiring a light frame of a second duration after each secondary exposure event;
- calculating a lag correction image for each light frame using at least one preceding dark frame;
- correcting a respective image with the lag correction image;
- and
- adjusting the resolution of the lag correction image to the resolution of the respective image prior to the act of correcting.
A medical imaging system, comprising:
- a source of a radiation stream;
- a detector configured to detect a portion of the radiation stream;
- a system controller operably coupled to the source;
- and
- a detector controller operably coupled to the system controller and the detector;
- wherein at least one of the system controller and the detector controller are configured to acquire two or more dark frames of a first duration following a primary exposure event, wherein each dark frame is followed by a secondary exposure event, to acquire a light frame of a second duration after each secondary exposure event, to calculate a lag correction image for each light frame using at least one preceding dark frame, and to correct a respective image with the lag correction image, wherein the at least one of the system controller and the detector controller is further configured to adjust the resolution of the lag correction image to the resolution of the respective image prior to the act of correcting.
A computer-readable medium, comprising:
- a routine for acquiring two or more dark frames of a first duration following a primary exposure event, wherein each dark frame is followed by a secondary exposure event;
- a routine for acquiring a light frame of a second duration after each secondary exposure event;
- a routine for calculating a lag correction image for each light frame using at least one preceding dark frame;
- a routine for correcting a respective image with the lag correction image;
- and
- a routine for adjusting the resolution of the lag correction image to the resolution of the respective image.
A medical imaging system, comprising:
- a source of a radiation stream;
- a detector configured to detect a portion of the radiation stream;
- a system controller operably coupled to the source;
- and
- a detector controller operably coupled to the system controller and the detector;
- wherein at least one of the system controller and the detector controller comprise a means for implementing a readout of alternating dark frames and light frames in which the readout of the respective dark frames and light frames occur at different speeds and a means for calculating a lag correction image for each light frame wherein an image derived from the light frame is corrected by the respective lag correction image.
Dependencies are inferred from the claim text.