A method for imaging includes scanning a B scan of a sample N times at a first slice of a sample. N is greater than or equal to 2. The B scan includes a plurality of A scans. A pixel of the first slice has an M number of A scans within the pixel. Each of the A scans have a spectrum range less than a full spectrum range of the light source. A number of pixels per B scan is an approximate B scan length divided by a lateral resolution size of the pixel. The method further includes determine a flow image of the sample using an optical coherence tomography (OCT) signal reflected back from the sample.
