Blood flow image diagnosing device and method

1. A method of performing blood flow image analysis of a subject using a laser light irradiation system for applying laser light to an observation region of a biotissue having blood cells and a light receiving section having a plurality of pixels and adapted to detect reflection light from the observation region of the biotissue,

the method comprising the steps of:

successively capturing a plurality of images on the basis of a signal from the light receiving section, and storing the plurality of images as a plurality of stored images;

computing the speed of blood flow within the biotissue from time course changes of output signals of the plurality of pixels throughout the plurality of stored images, and creating a blood flow map having a two-dimensional distribution using the speed of the blood flow;

obtaining, in advance for a plurality of persons, a relation between laser reflectance and the blood flow value in the observation region of the plurality of persons, and storing the relation, the relation being used for creation of a correction coefficient used for correcting the blood flow map in accordance with the pigment concentration of the observation region;

creating, at the time of new measurement, the correction coefficient on the basis of a newly obtained laser reflectance of the subject and the stored relation between the laser reflectance and the blood flow value, the laser reflectance being obtained from a relation between a laser reflection intensity of the reflection light detected from the observation region, and a signal representing an intensity of laser light radiated from the laser light irradiation system; and

correcting the blood flow map in accordance with the created correction coefficient, and therefore displaying the blood flow map corrected on the basis of the correction coefficient by a standardized numerical value irrespective of the race of the subject.

2. A method for diagnosing in a subject a blood flow in an observation region of biotissue having blood cells, the method comprising the steps of:

applying laser light to the observation region of the biotissue;

detecting reflection light from the observation region of the biotissue;

successively capturing a plurality of images from the detected reflection light;

creating a blood flow map for the blood flow within the biotissue from the plurality of captured images, said creating of the blood flow map including providing the blood flow map with blood flow values for the blood flow within the biotissue;

predetermining for a plurality of persons, a population relationship between laser reflectance and blood flow value in an observation region of the plurality of persons;

determining for the subject, a laser reflectance from the observation region of the biotissue of the subject;

creating a correction coefficient based on the laser reflectance from the subject and from the population relationship; and

correcting the blood flow values in the blood flow map in accordance with the created correction coefficient;

displaying the blood flow map with the corrected blood flow values.

3. A method in accordance with claim 2 , wherein:

said creating of the correction coefficient uses a pigment concentration of the observation region of the subject.

4. A method in accordance with claim 3 , further comprising:

determining the pigment concentration from the laser reflectance from the subject, and the laser reflectance is determined from an intensity of the applied laser light and an intensity of the reflection light.