MRI MRI Sequences and Protocols 2

Question 1

Echo planar imaging (EPI) is used in which MRI techniques due to its extremely fast acquisition speed?

Accepted Answer

DWI, fMRI, and perfusion imaging

Answer

Conventional T1 spin echo and MRCP

Answer

MR arthrography and spectroscopy

Answer

STIR and inversion recovery sequences

Question 2

In MR angiography, time-of-flight (TOF) technique produces vascular signal by exploiting which physical principle?

Accepted Answer

Inflow enhancement: unsaturated blood entering a saturated imaging slab

Answer

T1 shortening by gadolinium contrast

Answer

T2 prolongation of blood

Answer

Chemical shift between blood and surrounding fat

Question 3

Which inversion recovery technique is used to suppress fat signal in musculoskeletal MRI?

Accepted Answer

STIR (Short TI Inversion Recovery)

Answer

FLAIR

Answer

MPRAGE

Answer

VIBE

Question 4

Phase contrast MRI (PC-MRI) is primarily used to measure:

Accepted Answer

Velocity and flow of fluids such as blood and CSF

Answer

Tissue T1 values

Answer

Chemical metabolite concentrations

Answer

Myelin content

Question 5

Which MRI protocol modification is used to evaluate the acetabular labrum of the hip with maximum sensitivity for tears?

Accepted Answer

MR arthrography with intra-articular gadolinium dilution

Answer

Standard T2 FSE without contrast

Answer

Diffusion-weighted imaging of the hip

Answer

T1 fat-saturated without contrast

Question 6

In cardiac MRI, which sequence is used to assess myocardial viability and detect scar tissue?

Accepted Answer

Late gadolinium enhancement (LGE) with inversion recovery

Answer

True FISP cine imaging

Answer

First-pass perfusion with adenosine stress

Answer

Black-blood T2 STIR