Please discard any preprocessed Scaled data from the subjects and scan dates below that were downloaded from LONI before 10/03/2007.

• 005_S_0572 2006-12-27
• 027_S_0408 2006-11-22
• 013_S_1035 2007-05-30
• 023_S_0058 2006-12-19
• 133_S_0433 2006-11-29
• 133_S_0488 2006-12-14
• 126_S_0605 2006-12-18
• 126_S_0506 2006-06-14
• 033_S_0513 2006-12-07
• 033_S_1098 2006-12-11
• 032_S_0187 2006-10-16
• 018_S_0425 2006-06-19
• 018_S_0633 2007-01-19
• 002_S_0413 2006-11-5
• 002_S_0559 2006-12-12

The corresponding LONI image IDs are: I36433, I38854, I40669, I40808, I42271, I42810, I47388, I48909, I50986, I50991, I50998, I62689, I65955, I65960, I69528, I70621, I71382, I72154, I72845, I73324

The MR Core found discrepancies in which scale factors were applied because of a duplicate id on the phantom for 1.5T and 3T scans done on the same day. The duplicate ids will be reassigned, the studies will be reprocessed under the new identifiers and re-uploaded to LONI.

Duplicate Scaled Images

A number of scaled images were uploaded in duplicate. They have now been deleted. All users should refrain from analyzing the following Image IDs if they were downloaded prior to 21 Sept 07: 45104, 38794, 45203, 46409, 47058, 34420, 48761, 60501, 60490, 42525

Philips Scanners Image Scaling

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.

ADNI MR Recall

Occasionally, the MR Core identifies preprocessed data through the Quality Control Process that is incorrect. In such cases, the MR Core, through LONI, will make an attempt to contact institutions that have downloaded data identified as incorrect. All investigators should regularly check this site for recall notices and remove data previously downloaded for analysis until corrected data has been posted.

For more information on MR recall advisories contact: Bret Borowski borowski.bret@mayo.edu

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 MR 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 MR sites, the data was reprocessed and re uploaded to LONI.

Masks

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."

Topic permissions

• Set ALLOWTOPICCHANGE = AdniGroup

-- KarenCrawford - 4 Oct 2007