open-discussion
open-discussion > RE: DWI QC Report interpretation
Mar 6, 2018 03:03 PM | Martin Styner
RE: DWI QC Report interpretation
Hi Giuseppe
In the docs section on NITRC you find a manual that should provide some information.
Wrt your QC report txt file: Yes, this would be gradient index 22 (starting at index 0, so it's the 23rd DWI volume). Slice 8 is the native slide 8 (again starting at index 0, so it's the 9th slice).
If that slice is actuallyfine, but at the full bottom or top of the brain then you need to increase the head skip (resp tail skip) parameter, so that it does not check there. The slices at the bottom and at the full top of the brain need to be skipped, as the slice wise check is based on consistency across slices and if the slice content, i.e. anatomy, changes dramatically from one slice to the other, then DTIPrep will flag that slice, even though the inconsistency is not due to an artifact.
Martin
Originally posted by Giuseppe Cabras:
In the docs section on NITRC you find a manual that should provide some information.
Wrt your QC report txt file: Yes, this would be gradient index 22 (starting at index 0, so it's the 23rd DWI volume). Slice 8 is the native slide 8 (again starting at index 0, so it's the 9th slice).
If that slice is actuallyfine, but at the full bottom or top of the brain then you need to increase the head skip (resp tail skip) parameter, so that it does not check there. The slices at the bottom and at the full top of the brain need to be skipped, as the slice wise check is based on consistency across slices and if the slice content, i.e. anatomy, changes dramatically from one slice to the other, then DTIPrep will flag that slice, even though the inconsistency is not due to an artifact.
Martin
Originally posted by Giuseppe Cabras:
Dear users and developers,
I am using DTIPrep 1.2.4 in a pipeline (no GUI) and apparently works fine, but I have some doubts on reading the QC report. Are there some instructions or a tutorial on how to read it? In particular I am interested on gradient remove info: in a subject i get gradient 22 removed because:
======
Slice-wise Check Artifacts:
Region Gradient# Slice# Correlation
whole 22 8 0.816240
=====================
but looking at gradient DWI I didn't see any hugly and slice 8 to what refer? native slice 8 in z axis? It is too low.
Eventually can I send you the dataset or the dwi volume 22?
Thanks in advance,
cheers,
Giuseppe
I am using DTIPrep 1.2.4 in a pipeline (no GUI) and apparently works fine, but I have some doubts on reading the QC report. Are there some instructions or a tutorial on how to read it? In particular I am interested on gradient remove info: in a subject i get gradient 22 removed because:
======
Slice-wise Check Artifacts:
Region Gradient# Slice# Correlation
whole 22 8 0.816240
=====================
but looking at gradient DWI I didn't see any hugly and slice 8 to what refer? native slice 8 in z axis? It is too low.
Eventually can I send you the dataset or the dwi volume 22?
Thanks in advance,
cheers,
Giuseppe
Threaded View
| Title | Author | Date |
|---|---|---|
| Giuseppe Cabras | Mar 6, 2018 | |
| Susanne Meinert | Apr 19, 2018 | |
| Martin Styner | Apr 19, 2018 | |
| Martin Styner | Mar 6, 2018 | |