MRI Pulse Sequences

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A Spin Echo

B Fast Spin Echo

C Echo Planar Imaging

D Inversion Recovery

A Gadolinium shortens T1 of enhancing tissue potentially bringing it to the STIR null point

B Gadolinium increases T1 of enhancing tissue pushing it away from the null point

C Gadolinium causes chemical shift artifact mimicking fat on STIR images

D Gadolinium increases SAR to unsafe levels when combined with STIR

A The 180-degree refocusing pulse compensates for static field inhomogeneities

B SE uses a smaller flip angle which reduces field distortion

C SE uses a shorter TE which reduces dephasing time

D SE fills k-space faster, leaving less time for dephasing

A Larger flip angles near 70 to 90 degrees produce stronger T1 contrast by increasing saturation

B Flip angle has no measurable effect on GRE contrast, only on SE contrast

C Smaller flip angles produce stronger T1 contrast by saturating longitudinal magnetization

D Larger flip angles reduce T1 weighting by progressively limiting magnetization saturation

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