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The perfusion signal to noise ratio (SNR) comparison.
| Perfusion SNR | ASL (young subjects) |
ASL (elderly subjects) |
PET (elderly subjects) |
|||
|---|---|---|---|---|---|---|
| Mean | STD | Mean | STD | Mean | STD | |
| GM ROI | 13.83 | 2.81 | 8.86 | 2.07 | 6.40 | 1.20 |
| WM ROI | 0.95 | 0.33 | 0.68 | 0.09 | 0.97 | 0.07 |
The perfusion SNR is the perfusion signal amplitude compared to the image background noise, scaled by square root of 3 to reflect the effect of average.
