Wall thickness estimation method, recording medium, wall thickness estimation device, and wall thickness estimation system

A non-transitory computer-readable recording medium having a program recorded thereon for causing a computer to execute a wall thickness estimation method comprising:

• obtaining behavioral information based on a video in which an a blood vessel wall is captured using four-dimensional angiography, the behavioral information being numerical information about changes over time in a position of each of a plurality of predetermined points in the blood vessel wall;
• generating, based on the behavioral information obtained in the obtaining step, estimation information that visualizes a strain of each of the plurality of predetermined points for estimating a thickness of the blood vessel wall;
• and
• outputting the estimation information generated in the generating step,
• wherein each of the plurality of predetermined points is regarded as a minute cube,
• wherein the generating the estimation information includes calculating, for each of the plurality of predetermined points, vertical strains of three components relative to a plurality of surfaces of the minute cube corresponding to the predetermined point,
• wherein for each of the plurality of predetermined points, the estimation information is information that visualizes, as the strain of the predetermined point, a strain having a maximum value among the vertical strains of the three components relative to the plurality of surfaces of the minute cube corresponding to the predetermined point,
• wherein the estimation information is image data indicating a relationship between (i) a shape of the blood vessel wall and (ii) the strain of each of the plurality of predetermined points, such that a first dot is assigned for each of the predetermined points at which the strain of the predetermined point expands by a predetermined rate or more and a second dot is assigned to the remaining plurality of predetermined points, the second dot being visually different from the first dot, and
• wherein the thickness of the blood vessel wall is a thickness of a wall of a cerebral aneurysm.

A wall thickness estimation device comprising:

• an obtainer which obtains behavioral information based on a video in which a blood vessel wall is captured using four-dimensional angiography, the behavioral information being numerical information about changes over time in a position of each of a plurality of predetermined points in the blood vessel wall;
• a generator which generates, based on the behavioral information obtained by the obtainer, estimation information that visualizes a strain of each of the plurality of predetermined points for estimating a thickness of the blood vessel wall;
• and
• an outputter which outputs the estimation information generated by the generator,
• wherein each of the plurality of predetermined points is regarded as a minute cube,
• wherein the generator generates the estimation information by calculating, for each of the plurality of predetermined points, vertical strains of three components relative to a plurality of surfaces of the minute cube corresponding to the predetermined point,
• wherein for each of the plurality of predetermined points, the estimation information is information that visualizes, as the strain of the predetermined point, a strain having a maximum value among the vertical strains of the three components relative to the plurality of surfaces of the minute cube corresponding to the predetermined point,
• wherein the estimation information is image data indicating a relationship between (i) a shape of the blood vessel wall and (ii) the strain of each of the plurality of predetermined points, such that a first dot is assigned for each of the predetermined points at which the strain of the predetermined point expands by a predetermined rate or more and a second dot is assigned to the remaining plurality of predetermined points, the second dot being visually different from the first dot, and
• wherein the thickness of the blood vessel wall is a thickness of a wall of a cerebral aneurysm.

A wall thickness estimation system comprising:

• an obtainer which obtains behavioral information based on a video in which a blood vessel wall is captured using four-dimensional angiography, the behavioral information being numerical information about changes over time in a position of each of a plurality of predetermined points in the blood vessel wall;
• a generator which generates, based on the behavioral information obtained by the obtainer, estimation information that visualizes a strain of each of the plurality of predetermined points for estimating a thickness of the blood vessel wall;
• an outputter which outputs the estimation information generated by the generator;
• a video information processing device which obtains the video, generates the behavioral information, and outputs the behavioral information to the obtainer;
• and
• a display which displays the estimation information output by the outputter,
• wherein each of the plurality of predetermined points is regarded as a minute cube,
• wherein the generator generates the estimation information by calculating, for each of the plurality of predetermined points, vertical strains of three components relative to a plurality of surfaces of the minute cube corresponding to the predetermined point,
• wherein for each of the plurality of predetermined points, the estimation information is information that visualizes, as the strain of the predetermined point, a strain having a maximum value among the vertical strains of the three components relative to the plurality of surfaces of the minute cube corresponding to the predetermined point,
• wherein the estimation information is image data indicating a relationship between (i) a shape of the blood vessel wall and (ii) the strain of each of the plurality of predetermined points, such that a first dot is assigned for each of the predetermined points at which the strain of the predetermined point expands by a predetermined rate or more and a second dot is assigned to the remaining plurality of predetermined points, the second dot being visually different from the first dot, and
• wherein the thickness of the blood vessel wall is a thickness of a wall of a cerebral aneurysm.