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Radiologic Technology · I.A.(MR)

ARRT Imaging Assistant, Magnetic Resonance Examination Practice Test

This practice set addresses MRI support tasks and foundational imaging concepts, including screening for conditions or equipment that may affect scanner safety, reducing motion, and supporting patient comfort. It also samples image-quality principles such as signal-to-noise ratio, fat suppression, phase encoding, and voxel size. These topics connect safe preparation and patient assistance with the basic factors that shape MR images.

Exam overview

Exam providerAmerican Registry of Radiologic Technologists
Exam codeI.A.(MR)
CategoryRadiologic Technology

About the ARRT Imaging Assistant, Magnetic Resonance Examination Exam

MRI assistants need to recognize when a patient, device, or item requires attention before it enters the scanner environment. Practice scenarios include responding to hearing-aid discomfort and understanding why equipment used near the scanner must be nonmagnetic. Patient support also involves anticipating loud acoustic noise, maintaining communication, and helping limit motion that can degrade image quality. Basic image-formation questions address how phase encoding contributes spatial information, how fat suppression changes tissue signal, and how voxel dimensions affect detail. Questions about signal-to-noise ratio reinforce that image quality reflects technical choices as well as patient cooperation. A contrast-related scenario involving reduced kidney function tests whether the learner recognizes a need for appropriate clinical review rather than making an independent contrast decision. Together, these concepts support safe workflow, clear communication, and informed assistance during MRI examinations.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

A patient with reduced kidney function is being considered for a contrast-enhanced MRI. Which approach is most appropriate?

  1. AGive contrast automatically because MRI contrast is not medically relevant to kidney function
  2. BUse the facility’s screening and risk-assessment process to determine whether contrast is appropriate
  3. CReplace all MRI contrast with iodinated CT contrast
  4. DAsk the patient to skip all prescribed medications before the scan
Show answerCorrect answer: B

Gadolinium-based contrast decisions should consider the patient’s clinical status, the specific agent, and current institutional policy. A qualified clinician should assess risks and benefits rather than applying a blanket rule.

Question 2

Why is a nonmagnetic oxygen cylinder required in the MRI scanner room?

  1. AMagnetic attraction could turn a ferromagnetic cylinder into a projectile
  2. BMagnetic fields rapidly consume oxygen in steel cylinders
  3. CNonmagnetic cylinders prevent radiofrequency heating of the patient
  4. DSteel cylinders block the scanner’s gradient fields completely
Show answerCorrect answer: A

A ferromagnetic cylinder can be strongly attracted toward the magnet and become a dangerous projectile. Only equipment approved for the MRI environment should be brought into the scanner room.

Question 3

What is a common effect of patient motion during an MRI acquisition?

  1. AGhosting or blurring in the reconstructed image
  2. BAn increase in the static field strength
  3. CA permanent change in the patient's tissue composition
  4. DRemoval of all susceptibility effects
Show answerCorrect answer: A

Motion can cause inconsistencies in the acquired data, often appearing as ghosting, blurring, or other artifacts. Patient comfort, clear instructions, and appropriate positioning can help reduce motion.

Question 4

Why are hearing protection and communication commonly provided during MRI examinations?

  1. AGradient switching can produce loud acoustic noise, and communication supports patient safety
  2. BThe scanner emits ionizing radiation that must be reported by the patient
  3. CHearing protection improves the strength of the main magnetic field
  4. DCommunication prevents the patient's hydrogen nuclei from relaxing
Show answerCorrect answer: A

Rapid switching of gradient coils can produce substantial acoustic noise. Hearing protection helps reduce noise exposure, while reliable communication lets the patient report discomfort or other concerns.

Question 5

A patient reports discomfort from a hearing aid before entering the MRI scanner room. What is the appropriate general action?

  1. AAsk the patient to remove it before entering the controlled MRI area, unless specifically cleared for that environment
  2. BAllow the patient to wear it because hearing aids contain no components affected by MRI
  3. CPlace it inside a receive coil so it will not move
  4. DSecure it with tape and proceed without further review
Show answerCorrect answer: A

Hearing aids may contain components that are unsafe or may malfunction in the MRI environment. They should be removed before entry unless the specific device has been evaluated and cleared under the facility’s MRI safety procedures.

Question 6

What is the primary purpose of the MRI patient table during an examination?

  1. ATo generate the radiofrequency pulses used for excitation
  2. BTo position and move the patient into the scanner bore
  3. CTo shield the patient from the static magnetic field
  4. DTo measure the patient’s oxygen saturation
Show answerCorrect answer: B

The patient table supports the patient and moves them into the magnet bore to place the region being examined at the appropriate location. It does not generate imaging pulses or provide physiologic monitoring by itself.

Question 7

Which change generally increases signal-to-noise ratio (SNR), when other factors are held constant?

  1. AUsing a smaller voxel
  2. BUsing a larger voxel
  3. CReducing the number of signal averages
  4. DIncreasing receiver bandwidth
Show answerCorrect answer: B

A larger voxel contains more contributing spins and generally provides higher SNR, though it may reduce spatial detail. Smaller voxels, fewer averages, and higher receiver bandwidth generally reduce SNR, all else being equal.

How to use this practice test

The free US Practice Tests practice bank contains 50 published questions. Each session presents up to 20 questions selected at random, with results shown after the session. Use the results to identify concepts to revisit, such as MRI room safety, patient comfort, image artifacts, or basic image-quality factors.

Preparation tips

  • Review MRI room safety principles, including why ferromagnetic or otherwise unsuitable equipment must not be taken into the scanner environment.
  • Practice explaining how motion can affect acquired images and how hearing protection and communication support patient comfort during scanning.
  • Compare the effects of voxel size, signal-to-noise ratio, and fat suppression on image appearance and diagnostic detail.
  • Trace the role of phase encoding in assigning spatial information to MR signal, distinguishing it from other image-formation steps.
  • For contrast-related scenarios involving kidney function, focus on recognizing when the concern requires review by the appropriate clinical staff.
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