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ARRT MRI Mock Registry questions and answers
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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 ...

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  • May 7, 2024
  • 46
  • 2023/2024
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ARRT MRI Mock Registry questions and answers 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 - answer 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 - answer Decreases A magnetic vector possesses attributes of both __________ and _____________. A. Strength; magnitude B. Direction; purpose C. Strength; flow D. Magnitude; direction - answer Magnitude; direction What element in the body is the principal nucleus utilized in clinical MR imaging? A. Helium B. Hydrogen C. Oxygen D. Calcium - answer 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 - answer 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 - answer 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 - answer 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 - answer 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 - answer 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 - answer 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 - answer 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 - answer 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 - answer Steel; passive If the TR in a gradient echo sequence is less than the T2 (or T2*), the resulting condition is known as:

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