Slicer3:XCEDE use cases

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Slicer3 use cases for XCEDE

Query Atlas Module


This is a record of the way we're using the xcede2.0 catalog in order to load in a query atlas scene that contains:

  • One FreeSurfer "lh" model and one FreeSurfer "rh" model at most
  • the FreeSurfer structural brain.mgz image volume
  • the FreeSurfer example functional example_func.nii
  • some FIPS-generated Statistical volumes
  • the FreeSurfer aparc+aseg.mgz label map volume
  • the FreeSurfer lh.aparc.annot annotation file
  • the matrix to align the example_func + statistics to the brain.mgz: anat2exf.register.dat


  • we are assuming a single lh or rh model (or one of each) is in the catalog. (Reason: Slicer will load the lh.aparc.annot file as a scalar overlay onto a model; so the overlay needs to be associated with a model automatically during load. Since the catalog attribute list contains no references to other datasets, the only way to associate the lh.aparc.annot to the lh.pial surface is by matching on the "lh." and "rh." in the model and annotation names.)
  • we are detecting whether a matrix with the name "anat2efx" is in the catalog (we should probably check the uri instead) -- and if so, we are wrapping the list of all FIPS-generated statistical volumes and the example_func(noted above) in a derived transform in the load routine. We recognize files with the string "brain.mgz" "example_func" and "anat2exf" in them, in order to do some automatic calculation of the Slicer transform that does the Slicer ras2ras registration. Then we stuff volumes with "example_func" or "stat" in their name into the derived transform.
    • the tests to detect these files are weak -- need a better test: now, a structural volume with the string 'stat' embedded in it will be stuffed into the transform by mistake.
    • no registration transform is computed if volumes matching the brain.mgz, example_func and an anat2exf.register.dat file are not detected.

New value inventions for attributes:

  • Freesurfer:matrix-1 (this gives us a clue about file format).
  • Freesurfer:overlay-1 (for files that need to be associated with a model in order to load in Slicer)
  • Freesurfer:label-1 (for mgz files that are label maps) This gives us a hint about what kind of color map to use to display the image data. The default colormap for volume data is greyscale.


Qdec Module

Description needed...

Prototype XCAT Files

<catalog ID="ID0">


<catalog ID="ID1">

<entry ID="ID2" name="anat2exf" description="matrix that registers anatomical information to functional datasets" format="FreeSurfer:matrix-1" content="anat2exf" cachePath="" modelID="ID2" uri="./anat2exf.register.dat"/>

<entry ID="ID3" name="lh.pial" description="pial surface of left hemisphere" format="FreeSurfer:surface-1" content="lh.pial" cachePath="" uri="./lh.pial"/>

<entry ID="ID4" name="rh.pial" description="pial surface of right hemisphere" format="FreeSurfer:surface-1" content="rh.pial" cachePath="" uri="./rh.pial"/>

<entry ID="ID5" name="brain" description="extracted brain mri" format="FreeSurfer:mgz-1" content="brain" cachePath="" uri="./brain.mgz"/>

<entry ID="ID6" name="exf" description="example functional dataset" format="nifti:nii-1" content="example_func" cachePath="" uri="./example_func.nii"/>

<entry ID="ID7" name="zstat7" description="7th zstatisic contrast E1+E3+E5>Fix" format="nifti:nii-1" content="zstat7" cachePath="" uri="./zstat7.nii"/>

<entry ID="ID8" name="zstat14" description="14th zstatisic contrast P1+P3+P5>Fix" format="nifti:nii-1" content="zstat14" cachePath="" uri="./zstat14.nii"/>

<entry ID="ID9" name="zstat17" description="17th zstatisic contrast Learn>Fix" format="nifti:nii-1" content="zstat17" cachePath="" uri="./zstat17.nii"/>

<entry ID="ID10" name="aparc+aseg" description="parcellation and segmentation label map" labelmap="true" format="FreeSurfer:mgz-1" content="aparc+aseg" cachePath="" uri="./aparc+aseg.mgz"/>

<entry ID="ID11" name="lh.aparc.annot" description="annotations for surface of left hemisphere" format="FreeSurfer:overlay-1" content="lh.aparc.annot" cachePath="" uri="./lh.aparc.annot"/>

<entry ID="ID12" name="rh.aparc.annot" description="annotations for surface of right hemisphere" format="FreeSurfer:overlay-1" content="rh.aparc.annot" cachePath="" uri="./rh.aparc.annot"/>




XCEDE REST Interface

A straw man REST interface to XCEDE. The implementation is using Grails (Groovy on Rails). Grails is a rapid application development environment patterned after Rails (Ruby on Rails). Grails, however, is completely Java-based utilizing industry standard components (Spring, Hibernate, Groovy). In addition, Grails supports many of the common AJAX frameworks and can be compiled and deployed as a .war file.

REST Interaction

REST support four basic operations akin to CRUD, Create, Read, Update and Delete. These verbs operate on resources (nouns) exposed as URIs, with CRUD relating to HTTP operations:

POST Create, Update, Delete
GET Read
PUT Create, Update

A server has been set up on slicerl using code in the NAMICSandbox (see next section for details). Two interfaces are available, a human-friendly web site and a machine-friendly REST interface. The command line program curl can interact with the REST interface, and is useful for learning and debugging.

Retrieve a list of available Projects

7: curl -X GET
<?xml version="1.0" encoding="UTF-8"?><list>
  <project id="1">
    <createdDateTime>2008-06-18 21:36:50.291</createdDateTime>
    <description>Neurological implications of working at BWH</description>
      <subjectGroup id="1"/>
  <project id="2">
    <createdDateTime>2008-06-18 21:36:50.332</createdDateTime>
      <subjectGroup id="2"/>

Update an existing Project (Note how Project 2 has been changed)

8: curl -X GET > Project2.xml
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   242    0   242    0     0    802      0 --:--:-- --:--:-- --:--:--     0

9: cat Project2.xml 
<?xml version="1.0" encoding="UTF-8"?><project id="2">
  <createdDateTime>2008-06-18 21:36:50.332</createdDateTime>
    <subjectGroup id="2"/>

11: perl -e 's/Bar/Garf/g' -pi Project2.xml

12: curl -X PUT -H 'Content-Type: application/xml' -d @Project2.xml
<?xml version="1.0" encoding="UTF-8"?><project id="2">
  <createdDateTime>2008-06-18 21:36:50.332</createdDateTime>

Create a new project (Note using POST creates a new project, while PUT updates an existing project, this command created a project with id=3)

15:  curl -X POST -H 'Content-Type: application/xml' -d @Project2.xml
<?xml version="1.0" encoding="UTF-8"?><project id="3">
  <createdDateTime>2008-06-18 21:43:04.790 EDT</createdDateTime>

Delete a project

17: curl -X DELETE