ADNI » MRI Core

New Jack Lab ADNI GO/2 MRI QC results available

kcrawford — Thu, 09 May 2013 18:33:31 +0000

New Jack Lab ADNI GO/2 MRI QC results are available in the DOWNLOAD section of the ADNI archive.

The dataset can be found under MR Image Quality.

New Longitudinal FreeSurfer Version 4.4 and ASL Perfusion CBF by FreeSurfer ROI results available

idossantos — Fri, 03 May 2013 00:52:06 +0000

New Longitudinal FreeSurfer Version 4.4 and ASL Perfusion CBF by FreeSurfer ROI results available in the Download section of the ADNI archive.

The datasets can be found under MR imaging analysis.

New MRI MCH Results Available

idossantos — Thu, 02 May 2013 01:02:26 +0000

New MRI micro-hemorrhage assessment results from the Jack Lab at Mayo are available and can be found under MRI Image Quality.

Additional MRI Analysis Results Available

kcrawford — Thu, 14 Feb 2013 18:34:56 +0000

New MRI analysis results from the Jack Lab at Mayo are available and can be found in the MRI Imaging Analysis section of the database website:

Task-Free fMRI DMN ROI
TBM-SyN Based Scores

Updated Recall Speadsheet for MR Images Now Available to Researchers

admin — Mon, 08 Mar 2010 22:20:16 +0000

The MRI Core has consolidated their image recalls into one Excel spreadsheet to allow researchers to quickly identify, modify or discard images from their study that are no longer appropriate. Going forward we will continue to update this spreadsheet and keep all recalls in one place for clarification. Please continue to read all MRI Core news items though for more information.

Click here to download the Consolidated MRI Recalls Spreadsheet

Processing Sites Updates

blee — Sat, 01 Nov 2008 21:56:14 +0000

This is the latest update for processing sites that addresses which scan to use if the site did two scans for a particular timepoint.

Click here to download the Excel Spreadsheet Table

Incorrect GE Gradients used for Gradient Warping Correction

cmena — Thu, 05 Jun 2008 19:52:52 +0000

Please discard any preprocessed GW data from the subjects and scan dates below that were downloaded from LONI before 06/01/2007.

Subject – Scan Date

006_S_1130 – 11/30/2006
098_S_0149 – 01/22/2006
098_S_0149 – 08/12/2006
098_S_0160 – 01/28/2006
098_S_0160 – 09/02/2006
098_S_0171 – 02/04/2006
098_S_0171 – 07/30/2006
098_S_0172 – 02/26/2006
098_S_0172 – 10/21/2006
098_S_0288 – 03/25/2006
098_S_0542 – 05/21/2006
098_S_0667 – 06/24/2006

The MRI Core found discrepancies in the ADNI phantom data analysis indicating the wrong gradient coefficient had been used to GW process these studies. The correct gradient was verified with the MRI sites, the data was reprocessed and re uploaded to LONI.

Preprocessed Image Recalls – 06/05/08

admin — Thu, 05 Jun 2008 19:07:59 +0000

Preprocessed Image Recalls – 06/05/08

Subject	Scan Date	Visit	Description	Image ID	Reason
023_S_0058	2005-11-30	Screening	MPR; GradWarp; B1 Correction; N3; Scaled	I30557	Phantom scale factors affected by algorithm modification.
037_S_0467	2006-05-02	Screening	MPR; GradWarp; N3; Scaled	I83101	Two subjects scanned on the same day, subject was originally paired with phantom from other subject.

A discrepancy was found in the phantom scaling.

Philips Scanners Image Scaling

cmena — Wed, 04 Jun 2008 19:37:15 +0000

The ADNI MRI core has uncovered a potential concern about the accuracy of image scaling in the frequency encode direction on Philips 1.5T systems. This problem is currently under investigation. For the time being, we suggest that investigators use this particular data judiciously. This message will be updated as more information becomes available.

Masks

admin — Thu, 04 Oct 2007 19:17:32 +0000

Masks created by the MR Core as part of preprocessing are useful for performing N3 correction and are not brain masks. Therefore, the description of these masks has been updated to read “Intracranial Space” rather than “Brain.”