Methods for stent strut detection and related measurement and display using optical coherence tomography
AssigneeLightLab Imaging, Inc.
InventorChenyang Xu
Life of this patent
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Abstract
In one embodiment, the invention relates to a processor based method for generating positional and other information relating to a stent in the lumen of a vessel using a computer. The method includes the steps of generating an optical coherence image data set in response to an OCT scan of a sample containing at least one stent; and identifying at least one one-dimensional local cue in the image data set relating to the position of the stent.
Claims20
A method of detecting a stent in a lumen of a blood vessel comprising:
- generating an optical coherence image data set in response to an optical coherence tomography (OCT) scan of the blood vessel, the optical coherence image data set comprising a plurality of scan lines;
- storing the optical coherence image data set in a memory device;
- and
- identifying at least one stent strut of the stent by detecting, using a processor, a one-dimensional local cue in one or more scan lines of the optical coherence image data set and
- displaying a cross-sectional image of the blood vessel and one or more identified stent struts.
A method of measuring stent position in a lumen of a blood vessel comprising:
- storing a plurality of scan lines in a memory device, the plurality of scan lines obtained using an optical coherence tomography probe to rotatably scan the blood vessel;
- detecting a plurality of stent struts, using a processor and a detector software module, in the plurality of scan lines;
- fitting an ellipse to a cross-section of the stent, using the processor;
- rejecting one or more detected stent struts using the ellipse;
- measuring a distance from one or more-stent struts to an edge of the lumen of the blood vessel;
- and
- calculating, using the processor, stent malapposition in response to the distance from the one or more stent struts to the edge of the lumen of the blood vessel.
A method for displaying stent related measurement data generated from an OCT image data set comprising the steps of:
- storing, in a memory device, a plurality of scan lines obtained with respect to a location of a stent in the lumen of a vessel using an OCT probe;
- analyzing the plurality of scan lines using a processor and a detector software module using the processor to identify stent struts on a per scan line basis;
- displaying the plurality of scan lines as a two dimensional surface map, and
- overlaying identified stent struts on the displayed surface map using symbols or colors.
A method for motion artifact removal in collected OCT image datasets comprising:
- storing an OCT image data set in a memory device, the OCT image data set obtained using an optical coherence tomography catheter to scan a blood vessel having a stent;
- determining aperiodicity of strut image data in the image data set using a processor configured to analyze a spatial frequency distribution;
- and
- applying a resampling function using the processor to restore periodicity of strut image data in the image data set.
A computer system for generating positional information about a stent in the lumen of a vessel, the computer system comprising:
- an electronic memory device and
- an electronic processor in communication with the memory device, wherein the memory device comprises instructions that when executed by the processor cause the processor to:
- generate an optical coherence image data set in response to an OCT scan of a sample containing at least one stent, the optical coherence image data set comprising a plurality of scan lines;
- identify a plurality of stent struts in the plurality of scan lines using a processor executing a detector
- fit an ellipse to the plurality of identified stent struts on a per frame basis;
- exclude misdetected stent struts from the plurality of stent struts using the ellipse;
- and
- display detected stent struts on a cross-sectional image of the vessel.
Dependencies are inferred from the claim text.