JP2018121888A5 - - Google Patents

Claims (6)

An OCT optical system that irradiates measurement light from a light source to a tissue of an eye to be inspected, and detects interference between a reference light and the measurement light reflected by the tissue by a detector;
One or a plurality of galvanometer mirrors for performing reciprocal driving including forward movement and backward movement and scanning the measurement light in a predetermined main scanning direction on the subject's eye as a main scanning optical scanner, and further comprising the main scanning The optical scanner for scanning has a sub-scanning optical scanner having a different scanning direction, and the measurement light is two-dimensionally scanned on the subject's eye based on the operation of the main scanning optical scanner and the sub-scanning optical scanner. A scanning unit for scanning;
Control means for acquiring A-scan data based on a signal output from the detector at least in a cycle of 300 kHz or more,
The control means causes the galvanomirror to be repeatedly reciprocated at a constant swing angle so as to continuously execute the scanning of the measurement light in the main scanning direction two or more times, and that a time difference between the start timings of each scan is 5 mm. An optical coherence tomography that at least controls the galvanomirror so that the value is equal to or less than a second. The control unit repeatedly scans the measurement light on the same scan line by repeatedly reciprocating the galvanomirror at the fixed swing angle,
By the measuring light to scan line acquires a data set comprising a plurality of A-scan data each time it is scanned ways 1, for processing a plurality of data sets among acquired in time series with respect to one scan line 2. The optical coherence tomography of claim 1 , wherein OCT angiography for the scan line is determined . The control means scans the measurement light repeatedly with respect to the scan line, the scan directions in each scan match, and the time difference is a value of 2.5 ms or more and 5 ms or less. The optical coherence tomography according to claim 2 , wherein the scanning unit is controlled so that the scanning unit is controlled. The control unit controls the scanning unit so that the scanning of the measurement light is performed at least in the forward movement of the galvanomirror, and the forward movement is performed in a range of 2 ms or more and 3 ms or less. optical coherence tomography according to any one of claims 1 to 3. The scanning unit includes at least a first galvanometer mirror and a second galvanometer mirror as the main scanning optical scanner,
Wherein the control means, by Rukoto is driven by combining the second galvanometer mirror and the first galvanometer mirror, a first measuring beam a measurement beam through the first galvanometer mirror, the second galvanometer mirror The optical coherence tomography according to any one of claims 1 to 4, wherein the second measurement light that is the transmitted measurement light is scanned in the main scanning direction independently of each other on the subject's eye . Said control means on the basis of the each of the forward movement and the backward movement of the galvanometer mirror performs scanning of the measurement light on the eye to be examined, further claims 1 to acquire A-scan data based on each scan 4 The optical coherence tomography according to any one of the above.