XNAT Tutorial

For up to date issues or problems with this database please see the wiki.
For more information, please visit the Extensible Neuroimaging Archive Toolkit.

The OASIS dataset from XNAT central is a set of human MRI images, from humans of different ages, clinical dementia ratings, and handedness, which is freely available to view and download.

The dataset was translated by NIF curators to include non-numerical values as these are crucial to finding the images that one may be interested in.

This tutorial will show how to view and obtain images.

Since this dataset primarily concerns Alzheimers disease, most of the records will come up if alzheimers disease is used as a key word. In the future, as XNAT central grows new datasets will be added and MRI data will be made available for other diseases and normal controls.

Below are the results from XNAT central under the category Data Type: Dataset

Clicking on the subject ID link will bring the user to the XNAT site, where more information from that particular subject is housed, including MRI images. Below, we have clicked on the first subject, a right handed, 77 year old male with mild Alzheimers dementia.

The clinical assessment link will take the user to a list of possible clinical assessments that could have been performed and the values filled in represent the actual assessment that was done at the time of the MRI session, see below:

Clicking on the word MR session (not the individual test scans) will lead to the following page, which contains the following information about the scans and has a window to view and download the images. Below we are going to chose the view images.

The view images link leads to a pop-up box with the MRI data information and options for which sorts of data the user would like to see. There are always default options, but the user must click on the GO button to actually begin to reconstruct the MRI data.

Note, after hitting GO, there is a lag, which has to do with your download speed. Since these files can be quite large, allow several minutes for them to download.

Below find the stack of MRI images, which is navigable by using the blue scroll bar at the bottom to, in this case, roll from anterior to posterior brain images.

From the previous page, there is an option to download the XML or the images for this subject.

For more information, please visit the Extensible Neuroimaging Archive Toolkit.