Abstract #3428
Variance in MRI Scanner Temporal Stability and TSNR for Functional MRI on Clinical Systems
Susan K Lemieux 1,2 , Karen L Brown 3 , Jeffrey J Vesek 2 , Christopher T Sica 2 , Jianli Wang 2 , and Qing X Yang 2
1
School of Science Engineering and
Technology, Penn State Harrisburg, Middletown, PA,
United States,
2
Radiology
- MRI Core, Penn State College of Medicine, Hershey, PA,
United States,
3
Radiology
- Health Physics, Penn State College of Medicine,
Hershey, PA, United States
Temporal signal-to-noise (TSNR) and stability are
critically important for clinical and research
echo-planar imaging (EPI) of the brain although not
always measured weekly or monthly as part of scanner
quality assurance. Temporal noise from the scanner
limits the detection of very small regions of interest (ROI)
of fMRI activations while relatively larger activations
can still be detected. To investigate the variability of
scanner temporal SNR and stability, measurements were
made on 7 clinical scanners. Temporal stability values
are reported. Quality assurance protocols for sites that
perform functional MRI scans should consider
incorporating temporal SNR and stability measurements.
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