Query about ADNI MRI analysis => some visits have two scans from two scanners at same date

[anlij...@gmail.com]

Dear ADNI data experts, 

I was trying to use the ADNI MRI analysis result, so I went to IDA.LONI to download the UCSF - Cross-Sectional FreeSurfer (FreeSurfer Version 4.3) [ADNI1,GO,2] csv file, where each row is an MRI scan for a subject a visit. 

I assumed that for each subject, it would be only scanned at one scanner for a visit, in this way we could get the brain ROI volumes. 

However, when I downloaded the imaging data (DICOM) from IDA.LONI, I found that for one subject,  who may will have been scanned at two scanner at same day, so I am confused about which row is corresonding to which MRI in that case. 

For example, I tried to extract header information for subject 002_S_0413 (please see attached figure), we could see on the day 2006-11-15, this subject was scanned at two scanners GE EXCITE and Philps Intera. This happened 197 times for ADNI 1/2Go. 

Could anyonw tell me how could I matched the duplicated image header to the row in USCF csv file? 

Thanks so much for your help

[Naomi Saito]

Hi,

ADNI1 subjects were assigned one of the following groups (we call "Arm"):

1: MRI 1.5T only

2: MRI 1.5T + PET

3: MRI 1.5T and 3T.

From looking at your screenshot, 002_s_0413 has both 1.5T and 3T (strength). 

UCSF FreeSurfer4.3 use 1.5T scans only. 

(UCSF FreeSurfer5.1 use 3T scans.)

Naomi

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From: adni...@googlegroups.com <adni...@googlegroups.com> on behalf of anlij...@gmail.com <anlij...@gmail.com>
Sent: Thursday, June 2, 2022 2:06 AM
To: Alzheimer's Disease Neuroimaging Initiative (ADNI) Data <adni...@googlegroups.com>
Subject: [adni-data] Query about ADNI MRI analysis => some visits have two scans from two scanners at same date

 

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[Lijun An]

Dear Naomi, 

Thanks for your quick response, your solution (using the FreeSurfer version to decide ) helped me a lot. 

However, for example, the subject 031_S_0568, this subject was from ADNI1 and was analyzed using FS4.3 (which I found on the UCSF CrossSectionalFreeSurfer 4.3 file). However, when I downloaded all DICOM images for this subject, I found the images of this subject were from the SIEMENS TrioTim 3T scanner. This happens for ~ 50 visits in ADNI1, 2, and Go. May I confirm these 1.5T images of this subject have been removed from ADNI or actually this analysis was done using 3T images but wrongly recorded as 1.5T in the UCSF file? 

Thanks for your help! :)

Best Regards,

An Lijun

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