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

Claim 9:
10. The method of claim 9, further comprising one or more of the following:
(i) acquiring a next frame of the region of interest (ROI);
(ii) isolating the region of interest (ROI) such that in a pre-scan conversion domain data is selected such that a band of two-dimensional (2D) images start a few pixels outside an outer radius of a catheter and extend for a depth equivalent to about a light penetration depth in blood;
(iii) receiving one or more imaging modality frames at a rate of up to 200 frames per second;
(iv) selecting the region of interest (ROI) from about 90 pixels in depth to 160 pixels in depth and for either all A-lines of an image or frame or from A-line 1 to A-line 500 of the image or frame;
(v) capturing the reference frame in a low rotation speed mode for a catheter of the imaging device and/or for the imaging device and adjusting the reference frame to match the ROI region of interest (ROI) for frames used to detect the automatic pullback trigger;
(vi) capturing the reference frame in a low rotation speed mode for a catheter of the imaging device and/or for the imaging device and adjusting the reference frame to match the region of interest (ROI) for frames used to detect the automatic pullback trigger, and using the region of interest (ROI) shown or as in the reference frame as a reference region of interest (ROI), instead of acquiring the next frame region of interest (ROI), values from the reference frame being indicative of or show a possible preclearing image; and/or
(vii) determining whether a possible preclearing image includes a case where contrast is or was administered by mistake before an imaging device was put in a pre-record mode and/or a pullback mode.