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. Author manuscript; available in PMC: 2012 Nov 5.
Published in final edited form as: Conf Proc IEEE Eng Med Biol Soc. 2009;2009:4073–4076. doi: 10.1109/IEMBS.2009.5333204

Fig. 1.

Fig. 1

Camera exposure time affects the linear response range of LSI. Raw speckle images collected from an in vitro blood flow phantom were converted to speckle contrast (not shown here) and ultimately to SFI images. Mean SFI values were computed from a ROI within the lateral boundaries of the flow tube. With typical exposure times of (A) 10 1 ms, a linear response range of 0 to 10 mm/s was achieved. With a further reduction in exposure time to (B) 0.01 ms, the linear response range was extended to 280 mm/s. Note that this 280 mm/s upper limit was imposed by our experimental setup.