AART MRI Mock Registry - Questions and Answers

AART MRI Mock Registry - Questions and Answers The difference in chemical shift is approximately ______ parts-per-million. A. 1.5 B. 2.5 C. 3.5 D. 4.5 E. 5.5 During movement or transfer of patients, a urinary collection bag should be placed: A. Below the level of the MR table B. At the foot of the MRI table C. On the stretcher between the patients legs D. Below the level of the urinary bladder The pixel size of the images which result from a 3D acquisition using a 260mm FOV, a 320 x 320 matrix, 32 slices and a volume of 64 mm is: A. 0.81 x 0.81 mm B. 0.88 x 0.88 mm C. 1.12 x 1.12 mm D. 1.18 x 1.18 mm E. 1.28 x 1.28 mm When a gradient echo sequence is selected for fast, breath hold dynamic contrast-enhanced imaging of the abdomen, _____________ is utilized. A. A refocussing 180° RF pulse B. An inverting RF pulse C. Presaturation D. Spoiling E. CSF nulling The structures that comprise the rotator cuff in the shoulder are: I. Deltoid muscle II. Subscapularis muscle and tendon III. Infraspinatus muscle and tendon IV. Teres minor muscle and tendon V. Supraspinatus muscle and tendon VI. Trapezius muscle and tendon Which of the following has been documented to cause muscle contractions, cardiac arrhythmias, mild cutaneous sensations and visual light flashes? A. Oscillating magnetic fields (RF -- radiofrequency) B. Time varying magnetic fields (TVMF -- gradient) C. Static magnetic fields (main magnet) D. Healthcare administration's recent demands When imaging the spine, to rule out metastatic lesions of the spinal cord, contrast enhancement is used with T1 weighted images because: A. CSF is bright and cord is dark B. Scar enhances and disk does not C. Metastatic lesions (in the cord) enhance and normal cord does not D. Normal cord enhances and metastatic lesions do not Calculate the effective TR for a patient with a heart rate of 70 beats / min. A. 692 ms B. 857 ms C. 1024 ms D. 1223 ms If the heart rate is 70 beats per minute, the R-R interval (effective TR) would be calculated as such: 60,000 milliseconds (60 seconds per minute, and there are 1000 milliseconds per second) ÷ 70 (heart rate) which = 857 milliseconds TR. If the desire is to null the signal from a specific tissue using an inversion recovery sequence, the inversion time (TI) selected should be ______ of the T1 relaxation time of that tissue. A. 37% B. 43% C. 63% D. 69% E. 82% If the desire is to null the signal from a specific tissue using an inversion recovery sequence, the inversion time (TI) selected should be 69% of the T1 relaxation time of that tissue. In order to generate thin slices, a ___________ is used. I. Steep slice selection gradient II. High amplitude slice select gradient III. Low amplitude slice select gradient IV. Narrow transmit bandwidth (tBW) V. Wide transmit bandwidth (tBW) VI. Narrow receiver bandwidth (rBW) Magnetic susceptibility artifacts are more prominent with _____________ sequences. A. Inversion recovery B. Spin echo C. Gradient echo D. Fast spin echo Which of the following field strengths would require the shortest TI time to suppress the signal from fat when performing a STIR sequence in an MRI of the ankle? A. 0.5T B. 1.0T C. 1.5T D. 3.0T As the TR is increased, I. SNR is increased II. Available number of slices is increased III. T2 information is maximized A. I only B. II only C. I and II only D. I and III only E. I, II and II Creating additional images in various planes from a 3D data set is accomplished by a technique known as: A. Subtraction B. Maximum intensity projection (MIP) C. Region of interest calculation(ROI) D. Multi-Planar reconstruction (MPR) E. Minimum Intensity Projection (MinIP) In a Fast Spin Echo (FSE) sequence, acquired with a long TE, yielding T2 weighted images, scan time can be reduced by: A. Increasing the FOV B. Increasing NEX C. Using shorter ETL D. Using longer ETL E. Increasing phase encodings The gradient slew rate is the: A. Time it takes longitudinal magnetization to regrow