Table 1. Comparison of endoscopic OCT speed.

	Frame rate (frames/s)	A-line rate (kHz)	Pullback speed (mm/s)	Tip diameter mm	Sensitivity dB	Beam scanning
Heartbeat OCT	4000 in vivo	2.88 × 103	100	1.2	98	distal
Commercial [13, 33]	160-180 clinical	81-100	10 - 40	<0.9	not reported	proximal
Li et al. [31]	208 in vitro	50	N/A	1.65	111	distal
Tsai et al. [32]	400 in vivo	1 × 103	1	3.2	103	distal
Cho et al. [14]	350 in vivo	242.8	12	0.87	102.5	proximal