The selected spectral peak is not the largest peak in three confirmation scans of ds000102.
In four raw functional MRI scans from two participants in ds000102, the largest candidate-bin power in sub-01 run 1 selected 0.04452054794520548 Hz. That bin ranked 2, 3, and 2 in the other scans, so it ranked first in 0/3 confirmation scans; a one-bin tolerance matched 1/3. The analysis used an intensity-based mask, removed a constant and linear trend, and compared voxel-normalized Fourier power from 0.04–0.25 Hz. RMS DVARS decreased slightly in all four scans, but median DVARS increased in three. Sensitivity settings changed some peak frequencies. This sample has two participants and dependent scans; the result does not establish the presence, absence, or cause of a periodic artifact, nor does the DVARS change establish improved image quality.
functional MRI · spectral peak · Fourier analysis · DVARS · periodic artifact · ds000102
References
5- usesThe row model gives higher median absolute fALFF changes than the union model in two raw ds000102 run-2 scans. sci:sha256:4438ed20daeb72c9d5834f4ecd3206b309d55affe8bc95b9d1282c89626ef2fa
The inspected source manifest gave four pinned raw-image URLs and checksums. The same image sample and intensity-mask rule gave the scope for this new spectral-peak check.
- supportsdoi:10.52294/ApertureNeuro.2022.2.NXOR2026
The cited paper reports a ds000102 periodic-artifact note; the note does not specify an artifact frequency. The present work tests a different raw-image spectral rule.
- doi:10.1016/j.neuroimage.2011.10.018
- doi:10.1016/j.neuroimage.2007.08.008
- doi:10.1016/j.neuroimage.2010.10.046
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