ARRT MRI Mock Registry

ARRT MRI Mock Registry When imaging a geriatric patient, while performing a PCA MRA sequence, what imaging parameter might the operator adjust? A. Field of view B. Presaturation band location C. Slice thickness D. VENC E. Contrast injection rate - ☑VENC As the number of phase encodings is increased from 256 to 512, SNR (signal to noise ratio): A. Increases B. Decreases C. Doubles D. Does not change E. Quadruples - ☑Decreases A magnetic vector possesses attributes of both __________ and _____________. A. Strength; magnitude B. Direction; purpose C. Strength; flow D. Magnitude; direction - ☑Magnitude; direction What element in the body is the principal nucleus utilized in clinical MR imaging? A. Helium B. Hydrogen C. Oxygen D. Calcium - ☑Hydrogen Which of the following best describes an IR sequence? A. A 180° pulse followed by a 90°/180° combination B. A 90° pulse followed by a 180° pulse C. A train of gradient echoes D. A train of spin echoes - ☑A 180° pulse followed by a 90°/180° combination Gradient echo sequences requiring high signal from fluid are known as all of the following EXCEPT: A. T2* gradient echo B. Steady-state gradient echo C. Coherent gradient echo D. Incoherent gradient echo - ☑Incoherent gradient echo The medial and lateral rectus muscles are located in the: A. Ears B. Posterior pelvic region C. Proximal calves D. Eyes E. Superior shoulder regions F. Soft tissues of the neck - ☑Eyes Reducing the number of lines filled in k-space will produce an image: A. With a decrease in spatial resolution B. With a increase in spatial resolution C. With an decrease in overall SNR D. With an increase in overall SNR E. With a reduced overall scan time F. B, C and E only G. A, D and E only - ☑A, D and E only Reducing the number of lines filled in k-space reduces the number of phase encoding steps, resulting in shorter scan time, an increase in overall SNR, but a decrease in spatial resolution. The smallest object that can be resolved in an image acquired with a 24cm FOV and a 272 x 272 matrix is _________ mm. A. 0.76mm B. 0.88mm C. 0.93mm D. 1.13mm E. 1.24mm - ☑0.88mm To produce an image based on differences in T1, the time interval between 90° excitation pulses should be: A. Long B. Short C. Refocussed D. Inverted - ☑Short The energy used to form MRI images is ____________ the patient's tissues. A. Emitted from B. Attenuated by C. Amplified from D. Reflected off - ☑Emitted from Referencing the Centers for Disease Control and Prevention (CDC), what type of isolation precautions should be used for HIV-positive patients in the MRI suite? A. Respiratory B. Droplet C. Standard (universal) D. Enteric E. Contact - ☑Standard (universal) ___________ could be used to line the walls and/or floors of the MR magnet room to reduce the fringe field, and is defined as __________ shielding. A. Copper; active B. Steel; active C. Copper; passive D. Steel; passive E. Lead; active - ☑Steel; passive If the TR in a gradient echo sequence is less than the T2 (or T2*), the resulting condition is known as: A. Spin down B. Steady state C. Spin dephasement D. Thermal equilibrium - ☑Steady state Which type of blood cell is responsible for phagocytosis? A. Leukocyte B. Erythrocyte C. Lymphocyte D. Platelet - ☑Leukocyte Which of the following, in an MRA sequence, aids in minimizing the loss of signal due to dephasing within a voxel: A. Long TE B. Short TR C. Smaller voxel size D. Short TE E. C and D - ☑C and D In order to acquire an intracranial arterial blood flow sequence, a presaturation pulse would be applied in which location? A. Below the heart B. Anterior to brain C. Inferior to slice group D. Superior to slice group - ☑Superior to slice group Which of the following best describes an EPI sequence? A. A 180° pulse followed by a 90°/180° combination B. A 90° pulse followed by a 180° pulse C. A train of gradient echoes D. A train of spin echoes - ☑A train of gradient echoes In a contrast enhanced MR angiography of the abdominal arteries, the IV gadolinium would enhance in which order? A. Superior mesenteric, inferior mesenteric, celiac, renal B. Inferior mesenteric, superior mesenteric, renal, celiac C. Celiac, superior mesenteric, inferior mesenteric, renal D. Celiac, superior mesenteric, renal, inferior mesenteric - ☑Celiac, superior mesenteric, renal, inferior mesenteric When imaging the female pelvis, the most optimal view for evaluation of the uterus is the: A. Axial B. Coronal C. Sagittal D. None of the above - ☑Sagittal Another term used for "fever" is: A. Hypothermia B. Apnea C. Dystonia D. Febrile - ☑Febrile When parallel imaging techniques are utilized, a low resolution __________ is acquired prior to the acquisition. A. Geometric accuracy pulse B. Calibration scan C. Presaturation pulse D. Contrast test bolus - ☑Calibration scan