Figure 3 | Scientific Reports

Figure 3

From: Synchronous functional magnetic resonance eye imaging, video ophthalmoscopy, and eye surface imaging reveal the human brain and eye pulsation mechanisms

Figure 3

fMREye scan detects vasomotor (0.01–0.1 Hz), respiratory (0.25 ± 0.05 Hz), and cardiovascular (1.1 ± 0.05 Hz) pulsations from whole head slices image data. (A) A representative FFT power map of the physiological pulsation from two slice data of 3-, 4-, and 5-mm slice thicknesses. (B) The mean FFT power of the same subject’s whole fMREye image for all scan protocols illustrate clear VLF, RESP, and CARD peaks and cardiorespiratory harmonics (N = 1). (C) The FFT power spectrum in different slice thickness from whole head slices fMREye simultaneous FEC, without pupillary dilation. The mean FFT power in the cardiac band was significantly higher for thinner slices, and likewise in the VLF band for 3 mm slices compared to 5 mm. There were no significant differences in the RESP band (N = 12). (D) The FFT power spectra from head slices fMREye data of different slice thickness, obtained simultaneously with MRcVO after pupillary dilation. FFT power for cardiac pulsation was higher for thinner slice scans compared to 5 mm thickness (N = 12). (* < 0.05, ** < 0.01, *** < 0.001, **** < 0.0001).

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