Grégory Operto

Downloading NIfTI resources from XNAT

2018-11-02

It is quite common that we use XNAT to download a bunch of NIfTIs to run some external analysis.

This generic example shows how to download NIfTI resources from an XNAT instance. In this context, NIFTI resources are stored at the scan level (subject/experiment/scan).

In this example, for …


Pushing NIfTIs to XNAT

2018-10-22

The primary data format with which XNAT works has been and is still DICOM. XNAT can work with NIfTI but it generally has to be using secondary resources attached to subjects, experiments or scans.

This example shows how to get a dataset made of NIfTIs uploaded to XNAT without their …


How to parallelize TBSS / randomise (sort of)

2018-02-26

Lots of resources - which I surely have not exhausted - are available on how to make optimal use of TBSS and in particular of the lengthy repetitive randomise part and the way to reduce costs in execution time. I confess I may have not tried hard after my first issues with …


Pushing bulk legacy data to XNAT

2018-02-23

This is not intended to be a tutorial on the subject, rather some feedback from a recent experience dealing with an old and half-remembered dream. dataset.

There are already plenty of useful resources out there e.g. from the XNAT documentation, discussion group. For instance, the Desktop Upload Assistant is …


Building design matrices for TBSS Randomise

2018-02-14

Creating design matrices by hand for TBSS can be done in different ways (explained here), either using the FSL Wizard Gui or exporting it from a text file or an Excel table.

A design matrix in TBSS is nothing but another text file using its own (Vest) format. This shows …