Patent ID: 11944778
Assignee: CANON U.S.A., INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 5:
6. The imaging device of claim 4, wherein one or more of the following:
(i) where a first frame or frames of the region of interest (ROI) are identified as an original image(s) or frame(s) of the region of interest (ROI), the original image(s) or frame(s) of the region of interest (ROI) are acquired for several frames including one or more of the following: the object, target, or sample being a blood filled lumen; the object, target, or sample being a partially clear lumen; diagnostically clear vessel wall(s) for the object, target, or sample being a vessel; a blood filled object, target, or sample; a partially clear object, target, or sample; and/or a diagnostically clear object, target, or sample;
(ii) the threshold is a pre-determined or set threshold value;
(iii) where a clearance metric is computed or determined, the clearance metric is computed for n segments of the region of interest (ROI), where n is one or more of the following: an integer value from 2 and up to half the number of processed A-lines in the region of interest (ROI), is in the range of 2 to 4, and/or is in the range of 2 to 8;
(iv) the threshold is set so that the automatic pullback is triggered after the partial clearing or only after the diagnostic clearing is achieved;
(v) the threshold is set to optimize the automatic pullback such that time taken from issuance of a trigger pullback to an actual motion of a pullback mechanism is in a tens of milliseconds range; and/or
(vi) the threshold is set to a high value such that the clearance metric only exceeds the threshold for an image that is equivalent or substantially equivalent to a diagnostically clear image, or the threshold is set low for a situation where a delay between the issuance of the trigger pullback to the actual motion of the pullback mechanism is larger than 100 milliseconds such that the clearance metric exceeds the low threshold for an image that is equivalent or substantially equivalent to a partly or partially clear image.