Diffusion MRI: Difference between revisions
Began dataset table |
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=Collaborative Research Projects= | =Collaborative Research Projects= | ||
All paths in this table are relative to <code>$G/data/diffusion</code> unless otherwise noted. | |||
{| {{Prettytable}} | |||
|- | |||
! {{Hl2}} | Project | |||
! {{Hl2}} | Location | |||
! {{Hl2}} | Collaborators | |||
! {{Hl2}} | Dataset | |||
! {{Hl2}} | Date Received | |||
! {{Hl2}} | Scanner | |||
! {{Hl2}} | Format | |||
! {{Hl2}} | Resolution (voxels) | |||
! {{Hl2}} | Voxel Size (mm) | |||
! {{Hl2}} | Orientation | |||
! {{Hl2}} | Status | |||
|- | |||
| {{Hl2}} rowspan="2" | Fibers at Risk | |||
| Colorado | |||
| Jack Simon | |||
| ''unknown / not transferred'' | |||
| ''N/A'' | |||
| 1.5T ?? | |||
| ?? | |||
| ?? | |||
| ?? | |||
| ?? | |||
| Longitudinal data and old proof-of-concept data need to be loaded into <code>$G/data/diffusion</code> | |||
|- | |||
| Portland, OR | |||
| Jack Simon (Portland [[wikipedia:VA Hospital|VA]]), Bill Rooney (phys. chemist at [[wikipedia:OHSU|OHSU]] AIRC) | |||
| ''not transferred'' | |||
| ''N/A'' | |||
| 7T GE | |||
| ?? | |||
| ?? | |||
| ?? | |||
| ?? | |||
| Still waiting for the 7T protocol to finalize. | |||
|} | |||
=Software= | =Software= | ||
Revision as of 19:55, 15 August 2008
Collaborative Research Projects
All paths in this table are relative to $G/data/diffusion unless otherwise noted.
| Project | Location | Collaborators | Dataset | Date Received | Scanner | Format | Resolution (voxels) | Voxel Size (mm) | Orientation | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| Fibers at Risk | Colorado | Jack Simon | unknown / not transferred | N/A | 1.5T ?? | ?? | ?? | ?? | ?? | Longitudinal data and old proof-of-concept data need to be loaded into $G/data/diffusion
|
| Portland, OR | Jack Simon (Portland VA), Bill Rooney (phys. chemist at OHSU AIRC) | not transferred | N/A | 7T GE | ?? | ?? | ?? | ?? | Still waiting for the 7T protocol to finalize. |
Software
File Formats
DICOM
DICOM Mosaic
Analyze
NIfTI
Files ending in .nii are in the NIfTI medical image format; it is becoming a standard export format for many different software packages, including FSL. .nii files combine the metadata header and image data into a single file, but NIfTI-1 is a modified form of Analyze 7.5, so it sometimes comes in .hdr/.img pairs. You can test for the format by using the is_nifti_file() function in the I/O wrapper library.
The format was created by the Neuroimaging Informatics Technology Initiative at NIH. It is a superset of Analyze 7.5, re-purposing empty fields in the Analyze format to support more features. Fortunately for us, the NIfTI reference library is available in the public domain, and $G/src/nifti is set up to download the latest version (with make download), build it, and install it in $G/lib/nifti and $G/include/nifti. You might also try snooping around $G/doc/nifti to see what they have to say in their documentation. $G/src/nifti2mriimage/nifti2mriimage.cpp demonstrates reading the header and extracting information from it, as well as reading the image data.
To use the NIfTI I/O wrapper library, simply #include <nifti1_io.h> in your code and add the following to the library list in your makefile: niftiio znz m z.
From the command line or shell scripts, the nifti_tool utility is pretty powerful and can read the header in a structured way.
The online documentation for NIfTI is also pretty sweet:
MRIimage
MRIimage is our in-house format for storing MRI data. It is manipulated by the gg/mri_g++-* library and its header is <gg/mri/image.H>.