Table 1.

Essential parameters in OCT

	En face TD-OCT	Longitudinal TD-OCT	SB-OCT	SS-OCT
Depth resolution is determined by:	Optical source bandwidth	Optical source bandwidth	Optical source bandwidth	Tuning bandwidth
Axial scan range is:	Unlimited	Unlimited	Limited by the spectrometer resolution	Limited by the optical source linewidth
Dynamic focus is:	Practical	Possible but difficult at high speed A-scan line rates	Nonapplicable	Nonapplicable
Sensitivity versus OPD is:	Constant	Constant	Maximum in OPD = 0	Maximum in OPD = 0
Mirror terms	None	None	Manifest if OPD = 0 is crossed	Manifest if OPD = 0 is crossed
Line rate determined by:	Transversal scanner	Axial scanner	Reading the linear camera	Tuning the swept source
Maximum achievable line rate	16 kHz (using a resonant scanner at 8 kHz)	∼100 kHz	∼300 kHz	∼5 MHz
Time to create an en face image of 500 lines each of 500 pixels along the line at the maximum achievable line rate is:	Given by the time to produce a C-scan frame, 31 ms	Given by the time to acquire a volume made from 500 B-scan frames of 500 line scans, ∼2.5 s	Given by the time to acquire a volume made from 500 B-scan frames of 500 line scans, ∼0.83 s	Given by the time to acquire a volume made from 500 B-scan frames of 500 line scans, ∼50 ms
Time to acquire a volume of 500 × 500 × 500 pixels at the maximum achievable line rate is:	15.5 s	∼2.5 s	∼0.83 s	∼50 ms