ADNI.ADNIMRICore (r1.1 vs. r1.8)
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 <<O>>  Difference Topic ADNIMRICore (r1.8 - 05 Jun 2008 - PaulaBritson)

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ADNI MRI Core

MRI Core News

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Preprocessed Image Recalls - 06/05/08

SubjectScan DateVisitDescriptionImage IDReason
023_S_00582005-11-30ScreeningMPR; GradWarp?; B1 Correction; N3; ScaledI30557Phantom scale factors affected by algorithm modification.
037_S_04672006-05-02ScreeningMPR; GradWarp?; N3; ScaledI83101Two subjects scanned on the same day, subject was originally paired with phantom from other subject.

A discrepancy was found in the phantom scaling.


Preprocessed Image Recalls - 10/3/07

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


 <<O>>  Difference Topic ADNIMRICore (r1.7 - 04 Oct 2007 - KarenCrawford)

META TOPICPARENT WebHome

ADNI MRI Core

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MRI Core News

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MRI Core News


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Preprocessed Image Recalls - 10/3/07

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

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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.

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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

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 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.
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Masks

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<		 -- KarenCrawford - 21 Sept 2007
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>		 -- KarenCrawford - 4 Oct 2007


 <<O>>  Difference Topic ADNIMRICore (r1.6 - 21 Sep 2007 - KarenCrawford)

META TOPICPARENT WebHome

ADNI MRI Core

MRI Core News

Added:
>
>		 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.

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<		 -- KarenCrawford - 07 May 2007
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>		 -- KarenCrawford - 21 Sept 2007


 <<O>>  Difference Topic ADNIMRICore (r1.5 - 15 Jun 2007 - KarenCrawford)

META TOPICPARENT WebHome

ADNI MRI Core

MRI Core News

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  • 098_S_0542 - 05/21/2006
  • 098_S_0667 - 06/24/2006

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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.
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>		 Masks

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>		 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

 <<O>>  Difference Topic ADNIMRICore (r1.4 - 12 Jun 2007 - KarenCrawford)

META TOPICPARENT WebHome

ADNI MRI Core

MRI Core News

Added:
>
>		 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.
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>		 ADNI MR Recall - NEW

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

Incorrect GE Gradients used for Gradient Warping Correction

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


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>		 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.

Topic permissions

 <<O>>  Difference Topic ADNIMRICore (r1.3 - 12 Jun 2007 - KarenCrawford)

META TOPICPARENT WebHome

ADNI MRI Core

MRI Core News

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FAQs

Q: Why are there cases where the subject has a 6 month scan but no baseline scan?

A: The subject's 1.5T screening scan becomes baseline if the subject is approved for the study.


Topic permissions

 <<O>>  Difference Topic ADNIMRICore (r1.2 - 22 May 2007 - KarenCrawford)

META TOPICPARENT WebHome

ADNI MRI Core

MRI Core News

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FAQs

Q: Why are there cases where the subject has a 6 month scan but no baseline scan?

A: The subject's 1.5T screening scan becomes baseline if the subject is approved for the study.


Topic permissions

 <<O>>  Difference Topic ADNIMRICore (r1.1 - 07 May 2007 - KarenCrawford)
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META TOPICPARENT WebHome

ADNI MRI Core

MRI Core News

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.

Topic permissions

-- KarenCrawford - 07 May 2007


Topic: ADNIMRICore . { View | Diffs | r1.8 | > | r1.7 | > | r1.6 | More }

Revision r1.1 - 07 May 2007 - 18:51 - KarenCrawford
Revision r1.8 - 05 Jun 2008 - 18:38 - PaulaBritson