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help > RE: Motion Composite Threshold
Aug 26, 2015 03:08 AM | Alfonso Nieto-Castanon - Boston University
RE: Motion Composite Threshold
Hi John,
Sorry about that, in the example in those notes the 'use diff motion' option is unchecked so it is using the somewhat less common 'absolute' composite motion measure (and that measure has a somewhat different scaling than the associated composite scan-to-scan differences measure because it is taking the mean across the 6 center-face bounding-box points, instead of looking at the maximum value across those points; for that measure a value of 0.5mm will not differ much in its effect to the default 2mm threshold in the motion composite scan-to-scan differences measure).
Hope this helps
Alfonso
Originally posted by John Hutton:
Sorry about that, in the example in those notes the 'use diff motion' option is unchecked so it is using the somewhat less common 'absolute' composite motion measure (and that measure has a somewhat different scaling than the associated composite scan-to-scan differences measure because it is taking the mean across the 6 center-face bounding-box points, instead of looking at the maximum value across those points; for that measure a value of 0.5mm will not differ much in its effect to the default 2mm threshold in the motion composite scan-to-scan differences measure).
Hope this helps
Alfonso
Originally posted by John Hutton:
Hi Alfonso:
I am setting up a resting state analysis in CONN with a cohort of 3-5 year old pediatric subjects. The notes from the pediatric example from the Cincinnati course suggest 0.5mm as scan-scan motion composite threshold for ART, which seems stricter than for adults, which was recommended as 1 or 2 (2 is default). Is this a typo, and should it be 5mm for pediatrics?
Thank you and all best,
John
I am setting up a resting state analysis in CONN with a cohort of 3-5 year old pediatric subjects. The notes from the pediatric example from the Cincinnati course suggest 0.5mm as scan-scan motion composite threshold for ART, which seems stricter than for adults, which was recommended as 1 or 2 (2 is default). Is this a typo, and should it be 5mm for pediatrics?
Thank you and all best,
John
Threaded View
| Title | Author | Date |
|---|---|---|
| John Hutton | Aug 24, 2015 | |
| Alfonso Nieto-Castanon | Aug 26, 2015 | |