MRI Parameters

MRI Registry

TR increases

SNR increases

Scan time increases

Effect on detail NO

SAR decreases

OTHER low T1, more slices

TE increases

SNR decreases

Scan time increases

Effect on detail NO

SAR NO

OTHER high T2, less slices

FOV increases

SNR increases

Scan time no (unless voxel size is constant)

Effect on detail decrease spatial resolution

SAR no

OTHER increase coverage

NSA/NEX increases

SNR increases

Scan time increases

Effect on detail NO

SAR increases

OTHER increase motion

ETL/TSE increases

SNR decreases

Scan time decreases

Effect on detail NO

SAR increases

OTHER increase blurring

TI increases

SNR decreases

Scan time increases (due to increased TR)

Effect on detail NO

SAR NO

OTHER increase tissue saturation

Phase Matrix increases

SNR decreases

Scan time increases

Effect on detail increase spatial resolution

SAR increases (indirect)

OTHER decrease truncation

flip angle increases

SNR increases

Scan time NO

Effect on detail NO

SAR increases

OTHER decrease susceptibility

rBw increases

SNR decreases

Scan time decreases

Effect on detail NO

SAR NO

OTHER decrease chemical shift and metal artifact

PI reduction factor increases

SNR decreases

Scan time decreases

Effect on detail NO

SAR decreases

OTHER decreases DWI susceptibility

DWI b-value increases

SNR decreases

Scan time increases (due to increase TR required)

Effect on detail NO

SAR NO

OTHER increased stroke/neoplasm detection

number of SAT bands increases

SNR decreases

Scan time increases (due to increased TR required)

Effect on detail NO

SAR increases

OTHER decreased reduction of motion/ flow artifacts

slice thickness increases

SNR increases

Scan time NO

Effect on detail decreased spatial resolution

SAR NO

OTHER increase partial volume artifacts

number of slices acquired increases

SNR NO

Scan time increases (due to increase in TR required)

Effect on detail NO

SAR increases

OTHER increase coverage