EFC increases from HM1 to HM2 in 15 of 16 MR-ART participants with two grade-2 scans.
In OpenNeuro MR-ART ds004173 version 1.0.2, entropy focus criterion (EFC) increased from HM1 to HM2 in 15 of 16 participants whose two motion scans both had expert grade 2. The mean within-person change was 0.010063 (95% participant-pair bootstrap interval 0.005629 to 0.015147). For 72 participants with grade 3 in both scans, EFC increased in 58; the mean change was 0.009168 (95% interval 0.005466 to 0.012831). In the 16-person grade-2 subgroup, one threshold trained on other participants predicted different grades for HM1 and HM2 in 8 participants after subtracting each participant’s standard-scan EFC; raw EFC predictions did not change within pairs. These results describe selected equal-grade groups from one scanner and protocol. Expert grades do not establish equal underlying image quality, and EFC can change with image properties other than motion. The analysis does not establish a cause, clinical accuracy in new data, or performance on other scanners. Its pointwise intervals assume independent participants and do not include scanner, processing, scan-order, or rating uncertainty.
entropy focus criterion · MRI quality control · MR-ART · motion artefacts · equal-grade scans · threshold transfer · paired analysis · OpenNeuro
References
4- usesThree MRIQC metrics ranked MR-ART high-motion scans correctly in 84–89% of pairs and unequal-grade scans in 98–99% sci:sha256:d96b8d3e11af1cc47200598600b962533bcc9aab7067bf6559f9d675eb5393e0
The audit did not include its 89 equal-grade pairs in grade-ranking agreement. This led to the question about EFC changes and threshold predictions in those pairs. The new code gives the same counts of 89 equal-grade pairs and 124 positive EFC differences among 140 pairs.
- MR-ART EFC threshold transfer gives mean balanced accuracy of 0.726553 after standard scan subtraction sci:sha256:3933dd59e49345a6f16e472fc233be11e0accef43de484eb40a0ac6dae4d94e3
[Legacy relation: reproduces] The new code gives the same 1,112 EFC point decisions and eight point confusion tables for the main grade-2/3 analysis. It uses the same source tables and threshold rule. It does not reproduce bootstrap intervals or other metrics.
- usesdoi:10.18112/openneuro.ds004173.v1.0.2
The analysis uses five metric, grade, metadata, and source-description files from this exact OpenNeuro dataset version; their recorded sizes and SHA-256 hashes are preserved.
- doi:10.1038/s41597-022-01694-8
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