open-discussion > QC'ed output: are bvecs already rotated?
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Jul 16, 2016 09:07 AM | Alexander Lebedev
QC'ed output: are bvecs already rotated?
Hi Dear All,
I am planning to implement DTIPrep steps in my tractography pipeline. Just wanted to double-check that the QC'ed output produced by the program is corrected for motion and eddy currents and that the bvecs are already rotated. Can anyone confirm this?
Thank you very much for you time!
/Alex
I am planning to implement DTIPrep steps in my tractography pipeline. Just wanted to double-check that the QC'ed output produced by the program is corrected for motion and eddy currents and that the bvecs are already rotated. Can anyone confirm this?
Thank you very much for you time!
/Alex
Jul 17, 2016 08:07 PM | Martin Styner
RE: QC'ed output: are bvecs already rotated?
Hi Alex
,
yes, the bvecs are all correctly rotated as part of the motion/eddy current correction process, so the QCed DWI image is ready for use for tensor (or other diffusion model) estimation. The transformation information that is computed in the correction process is also recorded in the QC xml report. It also has a total translation and total rotation entry for quick assessment of motion per DWI (e.g. when you need to look at whether the amount of motion in the DWI data is correlated with group or covariates).
Martin
,
yes, the bvecs are all correctly rotated as part of the motion/eddy current correction process, so the QCed DWI image is ready for use for tensor (or other diffusion model) estimation. The transformation information that is computed in the correction process is also recorded in the QC xml report. It also has a total translation and total rotation entry for quick assessment of motion per DWI (e.g. when you need to look at whether the amount of motion in the DWI data is correlated with group or covariates).
Martin