From 8a9e1487c09d7422959d5321ed9c5553aa3efe1c Mon Sep 17 00:00:00 2001 From: Oscar Esteban Date: Fri, 23 Apr 2021 09:39:05 +0200 Subject: [PATCH] enh: add comment regarding 'effective' vs. 'requested' gradients --- .../01-magnetic-resonance-imaging-data.md | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/04-modality-specific-files/01-magnetic-resonance-imaging-data.md b/src/04-modality-specific-files/01-magnetic-resonance-imaging-data.md index d17dc3cbd1..23615a59c6 100644 --- a/src/04-modality-specific-files/01-magnetic-resonance-imaging-data.md +++ b/src/04-modality-specific-files/01-magnetic-resonance-imaging-data.md @@ -525,6 +525,11 @@ The user is free to choose any other label than `singleband` and The gradient strength and orientation information corresponding to a DWI acquisition is REQUIRED, and therefore, MUST be stored in the structure. +The gradient strength and orientation information stored in the structure MUST correspond +to "effective" values (as in, the actual orientations and strengths applied by the scanner), +rather than the "requested" values (as in, the original gradient table design that is +configured into the scanner's MR protocol settings). + The RECOMMENDED way to store gradient information is a `[*_]dwi.tsv` file corresponding to one or more DWI files. The format of this TSV file, and associated metadata, are described below.