Oct motion contrast acquisition method and optical coherence tomography device

An OCT motion contrast data acquisition method using an optical coherence tomography device, the method comprising:

• controlling an optical scanner for scanning, on a test subject, measurement light radiated to the test subject;
• performing a first scanning control for obtaining a first OCT signal group including at least two temporally different OCT signals at a same scanning position;
• performing a second scanning control for obtaining a second OCT signal group including at least two temporally different OCT signals at the same scanning position as the first OCT signal group after obtaining the first OCT signal group;
• and
• obtaining first motion contrast data based on the first OCT signal group obtained in the first scanning control;
• obtaining second motion contrast data based on the second OCT signal group obtained in the second scanning control;
• and
• obtaining third motion contrast data based on the first motion contrast data and the second contrast data.

An optical coherence tomography device comprising:

• an OCT optical system configured to obtain an OCT signal based on the measurement light radiated on a test subject and reference light;
• an optical scanner configured to scan the measurement light radiated to the test subject to scan on the test subject;
• a processor;
• and
• a memory storing computer readable recording medium causing the optical coherence tomography device to execute:
• performing a first scanning control for obtaining a first OCT signal group including at least four temporally different OCT signals at a same scanning position;
• performing a second scanning control for obtaining a second OCT signal group including at least four temporally different OCT signals at the same scanning position as the first OCT signal group after obtaining the first OCT signal group, and
• obtaining first motion contrast data based on the first OCT signal group obtained in the first scanning control;
• obtaining second motion contrast data based on the second OCT signal group obtained in the second scanning control;
• and
• obtaining third motion contrast data based on the first motion contrast data and the second motion contrast data.