Vascular data processing and image registration systems, methods, and apparatuses
In part, the invention relates to processing, tracking and registering angiography images and elements in such images relative to images from an intravascular imaging modality such as, for example, optical coherence tomography (OCT). Registration between such imaging modalities is facilitated by tracking of a marker of the intravascular imaging probe performed on the angiography images obtained during a pullback. Further, detecting and tracking vessel centerlines is used to perform a continuous registration between OCT and angiography images in one embodiment.
1. A processor-based method of displaying an angiographic and an intravascular representation of a blood vessel comprising:
generating a set of optical coherence tomography image data in response to distance measurements of the blood vessel obtained during a pullback of a probe through the blood vessel using an optical coherence tomography system, the set of optical coherence tomography image data comprising a plurality of cross-sectional image at a plurality of positions along the blood vessel;
generating a set of angiography image data using an angiography system during the pullback of the probe through the blood vessel using an optical coherence tomography system, the set of angiography image data comprising a plurality of two-dimensional images obtained at different points in time during the pullback;
displaying, on a graphical user interface, a first panel comprising a first longitudinal view of the blood vessel generated using the optical coherence tomography image data; and
displaying, on a graphical user interface, a second panel comprising a frame of the angiography image data identifying the blood vessel using one or more points in the frame and a vessel centerline passing through the one or more points.
2. The method of claim 1 , further comprising co-registering the optical coherence tomography image data and the angiography data using vessel centerlines to create a continuous registration of a tracked marker, wherein the tracked marker is disposed on an optical coherence tomography data collection probe.
3. The method of claim 1 further comprising co-registering the optical coherence tomography image data and the angiography data such that selecting a point along the vessel centerline through a user interface changes a frame identifier in the first longitudinal view.
4. The method of claim 2 further comprising using pullback speed or pullback length to perform an iterative search to reject candidates for the tracked marker based on the possible locations for such markers based upon the pullback length and/or pullback speed.
5. The method of claim 1 wherein the vessel centerline is generated using a shortest path technique and a plurality of processing steps from a Dijkstra algorithm.
6. The method of claim 1 further comprising the step of removing a guide catheter image from one or more frames of angiography data using superposition of an intensity profile.
7. The method of claim 1 wherein the vessel centerline is generated using path information generated from one or more angiography frames in the absence of contrast solution.
8. The method of claim 1 further comprising generating a confidence score for each detection and co-registration between angiography data and optical coherence tomography data.