Big Drift
Big Drift
Embedded Files
Mission of the project
Mission of the project
To study the effect of high gradient duty cycles sequences on drifting in MR spectroscopy
To collect drifting data from different sites using 3 Tesla MR scanner from different vendors and models
Summary of the scanning protocol:
Localization/Survey (minimal)
Pre-PRESS without water suppression (TR/TE = 5000/35 ms, Dyn = 64, duration = 5 mins 20 sec)
ADNI-3 fMRI (duration = ~10 mins to induce drift)
Post-PRESS without water suppression (TR/TE = 5000/35 ms, Dyn = 360, duration = 30 mins)
Water dominated phantom (e.g. Braino) (leave phantom in the scanner or at the scanning room for 6 hours for acclimatization)
Head coil (8ch/16ch/20ch/32ch)
Scanner has to be cooled down for 6 hours before data acquisition (ideally the first scan in the morning)
Upload data in: .data/.list (raw Philips) and .SDAT/.SPAR (Philips); .7 P file (GE); TWIX (Siemens)
Please see documentation for full details.
1. Protocol in PDF
For GE users, please setup your scan using the GE protocol.
For Philips users, you can create your own exam card or download it below.
For Siemens users, please setup your scan using the Siemens protocol or use importable .exar1 file for VE11B and VE11C.
2a. Philips Exam Cards
Download your Philips exam card (R5.4.1 exam card should be importable for R5.50-R5.5.2).
2b. Siemens .exar importable file
Download your Siemens importable .exar file for VE11B and VE11C (if you are using other platforms, please setup your scan using the Siemens protocol).
3. Report Software/hardware details
Report your hardware and software details using attached Excel.
4. Finally, upload your data together with the Excel to your OneDrive site folder
5. Special Remarks
Philips
Upload both .data/.list and .SDAT/.SPAR data to your site folder (the exam card is set to save raw data).
To reconstruct and export raw data in .data/.list format
Right click on the pre- and post- PRESS data > “Reconstruction” > “Raw Export” (figure 1)
Double click on the RawExp - this will bring up a parameter editor for the export (figure 2)
Set the “Output file identification” to a unique number and Accept - this becomes the file name for the exported data (figure 2)
Right click start the export step (figure 3)
The raw data (.data/.list) will be generated in g:\temp (figure 4)
For gradient temperature (optional), during the scan, go to G:\log\devlogcurrent.log and then search for "hotspot max temps" (see attached figure 5). Check the time corresponding to the scan and take a record before and after running fMRI.
For shimming materials (optional), go to G:/shim and there should be a document containing those details.
Siemens
For Siemens VE11C scanner, do not use multi-band acceleration. Follow the Siemens protocol or use ADNI-3 20VB17 protocol to setup your fMRI sequence
For gradient temperature (optional), in your console, go to
C:\MedCon\MrLogRepository\"select the latest folder"\HOST\PerCoilTemp.log\####_PerCoilTemp.log
Record gradient temperature according to the time before and after your fMRI scan (see attached figure 6).
GE
For gradient temperature (optional), in your console, go to
/usr/g/service/log/paramdata/sriTemp.xml
Questions?
Questions?
Contact [stevehui@jhu.edu/gabamrs@gmail.com] to get more information on the project
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