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Fig. 3 | BMC Ophthalmology

Fig. 3

From: Changes in pulse waveforms in response to intraocular pressure elevation determined by laser speckle flowgraphy in healthy subjects

Fig. 3

Pulse waveform analysis of the eight waveform parameters. The skewed shape shows the asymmetry of the waveform (a). If the shape of the waveform is symmetrical, the skew is 0 and if the peak comes earlier than that, the degree of skewness increases and the peak slower, and the degree of skewness decreases. The blowout score (BOS) indicates the amount of the blood flow volume in one heartbeat (width of a heartbeat) (b). The blowout time (BOT) represents the length of time that the wave maintained more than half of the mean of the maximum and minimum MBR in a heartbeat (c). The half-width is the duration of the time that the MBR is higher than (MBR max – MBR min)/2. The rising rate (RR) is the relationship of the area of the S1 to that of S all (d). S all is the square area before the peak and the S1 is the increasing area (d). The falling rate (FR) is the proportion of the area of the S2 to the S all (e). S all is the area of the square after the peak and the S2 is the decreasing area (e). The flow acceleration index (FAI) is the maximum change of the increasing MBR in 1/30 s (f). The acceleration time index (ATI) is the ratio of the duration of the time to reach peak (width to reach peak) in one heartbeat (width of a heartbeat) (g). The resistivity index (RI) is calculated by dividing the difference of MBR max and the MBR min by the MBR max (h)

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