Difference between revisions of "Projects/Diffusion/2007 Project Week EPI Distortion correction using field maps"
(6 intermediate revisions by 2 users not shown) | |||
Line 1: | Line 1: | ||
+ | {| | ||
+ | |[[Image:ProjectWeek-2007.png|thumb|320px|Return to [[2007_Programming/Project_Week_MIT|Project Week Main Page]] ]] | ||
+ | |||
+ | |} | ||
+ | |||
+ | |||
+ | __NOTOC__ | ||
===Key Investigators=== | ===Key Investigators=== | ||
* BWH: Marek Kubicki | * BWH: Marek Kubicki | ||
Line 7: | Line 14: | ||
<div style="width: 27%; float: left; padding-right: 3%;"> | <div style="width: 27%; float: left; padding-right: 3%;"> | ||
+ | |||
+ | <h1>Objective</h1> | ||
+ | EPI data collected for DTI and fMRI analysis are spatially distorted, due to susceptibility/chemical shift artifacts. Our VCFS pilot data have been collected using parallel imaging, which reduces distortions, but does not eliminate them. In our data, we see artifacts in the inferior temporal and inferior frontal brain regions. As suggested by Bruce Fischl at the last Core1 meeting, we collected field maps to calculate distortions, which information could be then used to "undistort" images. | ||
+ | |||
+ | |||
+ | </div> | ||
+ | |||
+ | <div style="width: 27%; float: left; padding-right: 3%;"> | ||
+ | |||
+ | <h1>Approach, Plan</h1> | ||
+ | |||
+ | In the series of field mapping, we acquired two sets of images with different TEs (9 and 15 ms). In each set, we have real images, imaginary images, and magnitude images for each slice location. Therefore, total number of images in the series is 2*3*85. We have one dataset that includes sMRI, DTI and fMRI, and need help with distortion correction. | ||
+ | |||
+ | |||
+ | Data can be found on BIRN at: <br> | ||
+ | /home/Projects/NAMIC__0003/Files/PNL/3T_EPI_distortion_correction_data_sample | ||
+ | |||
+ | </div> | ||
+ | |||
+ | <div style="width: 40%; float: left;"> | ||
+ | |||
+ | <h1>Progress</h1> | ||
+ | |||
+ | We have discussed different strategies of distortion correction approaches. We are in the process of investigating "free surfer" abbility to deal with our field maps. | ||
+ | |||
+ | </div> | ||
+ | |||
+ | <br style="clear: both;" /> | ||
+ | |||
+ | </div> |
Latest revision as of 16:21, 19 July 2007
Home < Projects < Diffusion < 2007 Project Week EPI Distortion correction using field maps![]() Return to Project Week Main Page |
Key Investigators
- BWH: Marek Kubicki
- Anyone else who is interesting in helping
Objective
EPI data collected for DTI and fMRI analysis are spatially distorted, due to susceptibility/chemical shift artifacts. Our VCFS pilot data have been collected using parallel imaging, which reduces distortions, but does not eliminate them. In our data, we see artifacts in the inferior temporal and inferior frontal brain regions. As suggested by Bruce Fischl at the last Core1 meeting, we collected field maps to calculate distortions, which information could be then used to "undistort" images.
Approach, Plan
In the series of field mapping, we acquired two sets of images with different TEs (9 and 15 ms). In each set, we have real images, imaginary images, and magnitude images for each slice location. Therefore, total number of images in the series is 2*3*85. We have one dataset that includes sMRI, DTI and fMRI, and need help with distortion correction.
Data can be found on BIRN at:
/home/Projects/NAMIC__0003/Files/PNL/3T_EPI_distortion_correction_data_sample
Progress
We have discussed different strategies of distortion correction approaches. We are in the process of investigating "free surfer" abbility to deal with our field maps.