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ARRT Limited Scope study materials
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ARRT Limited Scope practice questions

One question at a time. Build your ARRT Limited Scope understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

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Question 1Patient Care and Safety

Which standard precaution applies to every patient regardless of known infection status?

  1. Masking all visitors at the entrance
  2. Wearing gloves whenever touching blood or body fluids Correct answer.
  3. Double-gloving for all contact
  4. Sterilizing the room after each patient

Explanation

Standard precautions treat all blood and body fluids as potentially infectious, so gloves are worn for any anticipated contact. They apply universally, not only to patients with a known diagnosis.

Question 2Patient Care and Safety

A technologist suspects a patient is experiencing an anaphylactic reaction to contrast. What is the priority action?

  1. Finish the remaining images quickly
  2. Document the reaction and continue
  3. Stop the study and summon emergency help Correct answer.
  4. Lower the patient's head and wait

Explanation

Anaphylaxis is a life-threatening emergency requiring immediate cessation of the study and activation of emergency response. Airway and circulation support take priority over completing the exam.

Question 3Patient Care and Safety

The primary purpose of wearing a lead apron during fluoroscopy is to:

  1. Protect the patient's thyroid
  2. Reduce occupational radiation dose Correct answer.
  3. Improve image contrast
  4. Increase tube output

Explanation

Lead aprons attenuate scattered radiation reaching the operator's body, lowering occupational dose. They do not change image quality or tube output.

Question 4Patient Care and Safety

Which action best demonstrates proper patient identification before an exam?

  1. Asking the patient to state their birthday only
  2. Calling the patient by name from the waiting room
  3. Confirming the room number on the requisition
  4. Using two identifiers and checking the order Correct answer.

Explanation

Two independent identifiers, such as name and date of birth, must be verified against the order. This prevents wrong-patient errors.

Question 5Patient Care and Safety

When transferring a patient from a wheelchair to the imaging table, the technologist should:

  1. Lift the patient under the arms
  2. Lock the wheels and position the chair close to the table Correct answer.
  3. Pull the patient by the shoulders
  4. Ask the patient to stand on the footrests

Explanation

Locking the wheels and minimizing the gap reduces falls and the distance the patient must move. Proper body mechanics protect both patient and staff.

Question 6Patient Care and Safety

Which vital sign value would most likely require postponing a contrast-enhanced study?

  1. Pulse of 72 beats per minute
  2. Respiratory rate of 16 per minute
  3. Temperature of 98.6 F
  4. Blood pressure of 88/54 mmHg Correct answer.

Explanation

Hypotension may indicate instability that increases risk with contrast administration. Abnormal vitals should be reported before proceeding.

Question 7Patient Care and Safety

The ALARA principle in radiography means:

  1. Always imaging every patient twice
  2. Avoiding all use of radiation
  3. Keeping radiation dose as low as reasonably achievable Correct answer.
  4. Using the highest exposure that the equipment allows

Explanation

ALARA directs that exposure be minimized while still obtaining diagnostic information. It balances image quality against dose.

Question 8Patient Care and Safety

A patient with a suspected infectious skin lesion requires imaging. Which precaution is most appropriate?

  1. Airborne precautions with an N95
  2. Contact precautions with gloves and gown Correct answer.
  3. No special precautions needed
  4. Standard precautions only

Explanation

Lesions that may be contagious by direct contact require contact precautions, including gloves and gown. Standard precautions alone may not prevent transmission.

Question 9Patient Care and Safety

Which factor most increases the risk of a fall in an elderly patient getting off the table?

  1. Recent meal
  2. Wearing a hospital gown
  3. Orthostatic hypotension Correct answer.
  4. Having a family member present

Explanation

Orthostatic hypotension causes dizziness on standing and is a common fall risk in older adults. Assistance and slow position changes help prevent falls.

Question 10Patient Care and Safety

When a patient reports shortness of breath during a supine exam, the technologist should first:

  1. Increase the exam speed
  2. Continue the exam and reassure the patient
  3. Elevate the head of the table and assess the patient Correct answer.
  4. Leave the room to get supplies

Explanation

Repositioning to ease breathing and assessing the patient addresses the immediate airway concern. Patient safety takes priority over completing the study.

Question 11Patient Care and Safety

Which practice best reduces the chance of a wrong-site procedure?

  1. Verifying the order and site with the patient before starting Correct answer.
  2. Marking the site after the exam begins
  3. Asking a coworker to guess the site
  4. Relying on the previous patient's chart

Explanation

Confirming the order and the intended site with the patient before the procedure prevents wrong-site errors. Verification should occur before imaging begins.

Question 12Patient Care and Safety

A technologist must move a patient who is too heavy to transfer alone. What is the correct action?

  1. Attempt the transfer alone
  2. Use a mechanical lift or get assistance Correct answer.
  3. Ask the patient to climb up unassisted
  4. Drag the patient to the table

Explanation

Safe patient handling requires mechanical lifts or adequate assistance to prevent injury to both patient and staff. Manual lifting beyond safe limits is discouraged.

Question 13Patient Care and Safety

Which statement about shielding the patient's gonads during radiography is accurate?

  1. Shielding replaces collimation
  2. Shielding improves image resolution
  3. Shielding is always required for every exam
  4. Shielding may be used when it does not obscure the area of interest Correct answer.

Explanation

Gonadal shielding is applied when it will not interfere with the diagnostic area of interest. It reduces dose to radiosensitive tissue but does not replace collimation.

Question 14Patient Care and Safety

A patient is confused and attempting to get off the table. The safest immediate response is to:

  1. Turn off the lights and leave
  2. Continue imaging and ignore the behavior
  3. Restrain the patient with tape
  4. Stay with the patient and lower the table Correct answer.

Explanation

Staying with the patient and lowering the table reduces fall risk and maintains supervision. Physical restraint requires proper protocol and is not a first response.

Question 15Patient Care and Safety

Which of the following best describes the purpose of informed consent before a procedure?

  1. Ensuring the patient understands risks and agrees to proceed Correct answer.
  2. Confirming insurance coverage
  3. Protecting the facility from lawsuits
  4. Documenting the technologist's schedule

Explanation

Informed consent confirms that the patient understands the procedure, its risks, and alternatives, and voluntarily agrees. It is an ethical and legal safeguard for patient autonomy.

Question 16Patient Care and Safety

The most effective way for a technologist to reduce their own occupational dose during a portable exam is to:

  1. Hold the image receptor by hand
  2. Increase exposure time
  3. Maximize distance and use shielding Correct answer.
  4. Stand close to the patient

Explanation

Dose decreases with distance from the source and with proper shielding. Both practices reduce occupational exposure.

Question 17Patient Care and Safety

A patient scheduled for an exam is taking a blood thinner and has a recent fall with a head injury. Which concern is most relevant to safety?

  1. The exam will produce more scatter
  2. Contrast will be less effective
  3. The patient may need a larger image receptor
  4. There is increased risk of bleeding complications Correct answer.

Explanation

Anticoagulation plus recent head trauma raises the risk of intracranial bleeding, which is clinically significant and should be communicated. This affects urgency and patient management.

Question 18Patient Care and Safety

Which hand hygiene practice is appropriate before and after patient contact?

  1. Using hand sanitizer only when gloves are worn
  2. Wiping gloves on the gown
  3. Washing with soap and water or using alcohol-based sanitizer Correct answer.
  4. Rinsing hands quickly with water

Explanation

Hand hygiene with soap and water or alcohol-based sanitizer before and after contact prevents transmission of organisms. Gloves do not replace hand hygiene.

Question 19Patient Care and Safety

During a procedure a patient becomes unresponsive and pulseless. After calling for help, the technologist should:

  1. Wait for the patient to respond
  2. Begin CPR and use an AED if available Correct answer.
  3. Finish the remaining images
  4. Document the event first

Explanation

For an unresponsive, pulseless patient, immediate CPR and defibrillation with an AED if available are indicated. These actions improve survival.

Question 20Patient Care and Safety

A pregnant technologist is concerned about occupational exposure. Which statement is most accurate?

  1. Pregnancy prohibits all work with radiation
  2. Dose monitoring and shielding allow continued safe work with precautions Correct answer.
  3. Pregnancy requires immediate transfer out of imaging
  4. Fetal dose is unaffected by distance

Explanation

With proper monitoring, shielding, and distance, pregnant workers can continue safely in imaging. Fetal dose limits and precautions guide practice.

Question 21Patient Care and Safety

A patient with a known latex allergy is scheduled for imaging. The best action is to:

  1. Use standard latex gloves since allergy is rare
  2. Use latex-free supplies and inform staff Correct answer.
  3. Proceed without asking about symptoms
  4. Apply a latex tourniquet briefly

Explanation

Latex-free supplies and communication prevent allergic reactions in sensitized patients. Avoiding latex contact is the key precaution.

Question 22Patient Care and Safety

Which situation most clearly requires the technologist to stop and escalate before continuing an exam?

  1. The patient requests a blanket
  2. The room is slightly cool
  3. The patient is mildly anxious
  4. The order conflicts with the patient's stated identity Correct answer.

Explanation

An identity conflict indicates a possible wrong-patient error and must be resolved before proceeding. Escalation protects patient safety.

Question 23Patient Care and Safety

A technologist notices a patient's IV site is swollen and painful before contrast injection. The correct action is to:

  1. Massage the site and continue
  2. Inject contrast anyway
  3. Increase the injection rate
  4. Stop and report the possible infiltration Correct answer.

Explanation

Swelling and pain suggest infiltration, so injection should not proceed. The site should be assessed and reported to prevent tissue injury.

Question 24Patient Care and Safety

Which of these best reflects the principle of patient autonomy?

  1. The technologist decides the exam without discussion
  2. The order overrides patient preferences
  3. The family always decides for the patient
  4. The patient may refuse or withdraw consent Correct answer.

Explanation

Autonomy recognizes the patient's right to make informed decisions, including refusal. Care should respect that choice.

Question 25Patient Care and Safety

A patient with a pacemaker is scheduled for an exam. The most appropriate first step is to:

  1. Assume it is safe if the patient feels fine
  2. Proceed with any modality without checking
  3. Verify device compatibility with the modality Correct answer.
  4. Remove the device

Explanation

Device compatibility with the planned modality must be verified to avoid interference or injury. Confirming the device type guides safe practice.

Question 26Patient Care and Safety

Which action best demonstrates proper body mechanics when lifting a cassette from the floor?

  1. Keep feet together and twist to reach
  2. Hold the cassette away from the body
  3. Squat with feet apart and keep the back straight Correct answer.
  4. Bend at the waist with straight legs

Explanation

Proper lifting technique involves bending the knees and hips while keeping the back straight, which reduces strain on the lower back. Keeping the feet apart provides a stable base, and holding the load close to the body minimizes torque.

Question 27Patient Care and Safety

When preparing to image a patient with a known airborne infection such as tuberculosis, which precaution is required?

  1. Airborne precautions with an N95 respirator and negative-pressure room Correct answer.
  2. Standard precautions only
  3. Droplet precautions with a surgical mask
  4. Contact precautions with gloves and gown

Explanation

Airborne infections spread via small particles that remain suspended in air, requiring an N95 respirator and a negative-pressure room to prevent transmission. Standard, contact, and droplet precautions are insufficient for airborne pathogens like tuberculosis.

Question 28Patient Care and Safety

Which of the following is an example of a patient's right under the principle of autonomy?

  1. The patient can override safety protocols without discussion
  2. The patient can refuse a procedure after being fully informed Correct answer.
  3. The patient can insist on a specific technologist for all exams
  4. The patient can demand any imaging study regardless of medical need

Explanation

Autonomy is the right of patients to make informed decisions about their own care, including the right to refuse a procedure after receiving complete information. Demanding unnecessary studies or overriding safety protocols does not reflect autonomous decision-making within ethical practice.

Question 29Patient Care and Safety

Which statement accurately describes the use of gonadal shielding during radiography?

  1. Shielding is required for all patients regardless of age or exposure
  2. Shielding should be used when it will not interfere with the diagnostic information needed Correct answer.
  3. Shielding eliminates the need to collimate the x-ray beam
  4. Shielding increases the radiation dose to the patient

Explanation

Gonadal shielding is used when it does not obscure anatomy or compromise the diagnostic value of the image. It reduces dose to radiosensitive organs but does not replace proper collimation or other dose-reduction techniques.

Question 30Patient Care and Safety

A patient with a known allergy to iodinated contrast is scheduled for a contrast-enhanced CT. What is the most appropriate initial action?

  1. Premedicate the patient according to a facility-approved protocol before contrast administration Correct answer.
  2. Proceed with the study using the standard contrast dose
  3. Switch to a non-ionic contrast agent without further evaluation
  4. Cancel the study permanently

Explanation

For patients with a history of contrast allergy, premedication with corticosteroids and antihistamines according to an established protocol reduces the risk of an adverse reaction. The radiologist should be informed, and the decision to proceed should be individualized.

Question 31Patient Care and Safety

During a portable chest x-ray on an intubated patient, which practice best reduces the technologist's occupational dose?

  1. Maximizing the distance from the patient and using a lead apron Correct answer.
  2. Standing as close to the patient as possible
  3. Holding the image receptor by hand
  4. Increasing the exposure time to reduce repeats

Explanation

Occupational dose is reduced by maximizing distance from the source of scatter and using appropriate shielding such as a lead apron. Increasing distance is especially effective because scatter radiation intensity decreases with the square of the distance.

Question 32Patient Care and Safety

A patient scheduled for an upper GI series reports that they are currently taking a medication that delays gastric emptying. What is the most appropriate action?

  1. Proceed with the study as scheduled
  2. Inform the radiologist and follow any instructions regarding medication adjustment or timing Correct answer.
  3. Double the amount of barium administered
  4. Reschedule the study without notifying the radiologist

Explanation

Medications that delay gastric emptying can affect the quality and interpretation of an upper GI study. The radiologist should be informed so that appropriate adjustments can be made, such as timing the study differently or modifying the protocol.

Question 33Patient Care and Safety

A patient with a suspected fracture of the wrist is in severe pain. Which action is most appropriate before obtaining the radiograph?

  1. Immobilize the wrist in a comfortable position and avoid unnecessary manipulation Correct answer.
  2. Administer a strong pain medication without a physician's order
  3. Apply a splint without imaging
  4. Ask the patient to move the wrist through its full range of motion

Explanation

Immobilizing the injured area in a position of comfort minimizes pain and prevents further injury during imaging. Unnecessary manipulation can worsen the fracture and increase patient discomfort.

Question 34Patient Care and Safety

A patient with a history of chronic obstructive pulmonary disease (COPD) is undergoing a procedure that requires lying flat. What is the most appropriate action?

  1. Elevate the head of the table and monitor the patient's breathing Correct answer.
  2. Administer oxygen without a physician's order
  3. Place the patient supine and proceed quickly
  4. Cancel the procedure immediately

Explanation

Patients with COPD may not tolerate lying flat due to compromised breathing. Elevating the head of the table improves comfort and ventilation, and monitoring ensures early detection of distress.

Question 35Patient Care and Safety

Which action best prevents the spread of infection when a technologist must move from a contaminated area to a clean area during a portable exam?

  1. Wipe gloves with a disinfectant wipe and continue
  2. Change gloves only if visibly soiled
  3. Use the same gloves but avoid touching the patient
  4. Remove gloves and perform hand hygiene before touching clean items Correct answer.

Explanation

Removing gloves and performing hand hygiene before contacting clean surfaces prevents cross-contamination. Gloves are not a substitute for hand hygiene and should be removed when moving from a contaminated to a clean area.

Question 36Patient Care and Safety

A patient arrives for an imaging exam and is unable to provide informed consent due to a language barrier. What is the most appropriate action?

  1. Use a qualified medical interpreter to obtain informed consent Correct answer.
  2. Postpone the exam indefinitely
  3. Ask a family member to sign the consent form
  4. Proceed with the exam after using gestures to explain

Explanation

Informed consent requires that the patient understands the information provided. A qualified medical interpreter ensures accurate communication and protects the patient's rights.

Question 37Patient Care and Safety

During a fluoroscopic procedure, the technologist notices the patient's IV site is red and swollen. What is the most appropriate immediate action?

  1. Flush the IV with saline to check patency
  2. Continue the procedure and monitor the site
  3. Stop the injection and notify the radiologist Correct answer.
  4. Apply a warm compress and proceed

Explanation

Redness and swelling at an IV site may indicate infiltration or phlebitis. Stopping the injection and notifying the radiologist prevents further complications and allows appropriate management.

Question 38Patient Care and Safety

A patient with a known seizure disorder begins to have a seizure during an imaging procedure. What is the technologist's priority?

  1. Insert an oral airway immediately
  2. Place the patient in a safe position and protect them from injury Correct answer.
  3. Restrain the patient's limbs to prevent movement
  4. Continue the imaging to complete the study quickly

Explanation

During a seizure, the priority is to protect the patient from injury by removing nearby objects and positioning them safely. Restraining movements or inserting objects into the mouth can cause harm.

Question 39Patient Care and Safety

A technologist is about to administer contrast to a patient who has a documented allergy to the contrast agent. The order does not mention premedication. What is the most appropriate action?

  1. Withhold the contrast and contact the ordering provider Correct answer.
  2. Switch to a different contrast agent without consulting
  3. Proceed with the contrast as ordered
  4. Administer a half dose of contrast

Explanation

Withholding the contrast and contacting the provider ensures patient safety and allows the provider to reassess the order. Administering contrast despite a known allergy without premedication could cause a severe reaction.

Question 40Patient Care and Safety

A patient is scheduled for an MRI but has a cardiac pacemaker. What is the most important initial step?

  1. Perform the MRI but limit the scan time
  2. Remove the pacemaker without a physician's order
  3. Proceed with the MRI if the patient feels well
  4. Verify the pacemaker is MRI-safe and consult the radiologist Correct answer.

Explanation

The magnetic field of an MRI can interfere with a pacemaker and pose serious risks. Verifying the device's MRI compatibility and consulting the radiologist are essential before proceeding.

Question 41Radiation Protection and Equipment Operation

Which interaction between x-ray photons and matter is most responsible for producing the differential absorption that creates subject contrast on a radiograph?

  1. Compton scattering
  2. Coherent (Rayleigh) scattering
  3. Photoelectric absorption Correct answer.
  4. Pair production

Explanation

Photoelectric absorption depends strongly on atomic number and photon energy, so tissues of differing composition absorb very differently, which is the basis of subject contrast. Compton scattering produces scatter that reduces contrast rather than creating it.

Question 42Radiation Protection and Equipment Operation

Increasing the kVp while keeping mAs constant will generally cause which change in the remnant beam?

  1. A decrease in beam penetrability
  2. A reduction in the number of photons produced
  3. An increase in beam penetrability Correct answer.
  4. No change in beam quality

Explanation

Higher kVp raises the average photon energy (beam quality), so more photons penetrate the patient and reach the image receptor. This also reduces the proportion of photoelectric absorption and lowers patient dose for a given receptor exposure.

Question 43Radiation Protection and Equipment Operation

Which device limits the size of the x-ray field to the area of clinical interest and thereby reduces patient dose?

  1. Grid
  2. Filtration
  3. Collimator Correct answer.
  4. Intensifying screen

Explanation

A collimator uses adjustable shutters to restrict the field, reducing the volume of tissue irradiated and lowering scatter. Filtration and grids serve different purposes in the beam path.

Question 44Radiation Protection and Equipment Operation

The primary purpose of added filtration in the x-ray tube housing is to:

  1. Increase the effective atomic number of the anode
  2. Reduce the size of the focal spot
  3. Remove low-energy photons that would only add patient dose Correct answer.
  4. Increase the number of low-energy photons

Explanation

Filtration preferentially absorbs low-energy photons that cannot penetrate tissue and would contribute dose without improving the image. This hardens the beam and reduces patient skin dose.

Question 45Radiation Protection and Equipment Operation

Which of the following is the correct SI unit used to express equivalent dose?

  1. Sievert (Sv) Correct answer.
  2. Coulomb per kilogram (C/kg)
  3. Becquerel (Bq)
  4. Gray (Gy)

Explanation

The sievert expresses equivalent and effective dose, accounting for radiation weighting. The gray expresses absorbed dose, and the coulomb per kilogram expresses exposure.

Question 46Radiation Protection and Equipment Operation

The annual occupational effective dose limit for a radiation worker is:

  1. 50 mSv Correct answer.
  2. 500 mSv
  3. 5 mSv
  4. 150 mSv

Explanation

The recommended annual occupational effective dose limit is 50 mSv (5 rem). The 5 mSv figure is closer to the public limit, and the larger values exceed the occupational limit.

Question 47Radiation Protection and Equipment Operation

The inverse square law states that radiation intensity is:

  1. Inversely proportional to the distance
  2. Inversely proportional to the square of the distance Correct answer.
  3. Directly proportional to the square of the distance
  4. Independent of distance

Explanation

Intensity falls off with the square of the distance from a point source, so doubling the distance reduces intensity to one quarter. This principle guides the use of distance as a protective measure.

Question 48Radiation Protection and Equipment Operation

Which personal dosimeter is worn to estimate the dose to the lens of the eye and the head when a lead apron is used?

  1. A pocket ionization chamber at the waist
  2. A badge worn under the apron at the waist
  3. A ring badge
  4. A collar badge worn outside the apron Correct answer.

Explanation

A collar badge worn outside the apron estimates the dose to the unshielded head and neck region. The body badge under the apron estimates the shielded torso dose.

Question 49Radiation Protection and Equipment Operation

A radiograph is produced at 200 mA, 0.1 s, 70 kVp. What is the mAs?

  1. 200 mAs
  2. 2 mAs
  3. 20 mAs Correct answer.
  4. 0.2 mAs

Explanation

mAs equals milliamperage multiplied by exposure time in seconds: 200 mA × 0.1 s = 20 mAs. mAs controls the total number of photons produced and thus receptor exposure.

Question 50Radiation Protection and Equipment Operation

A technologist doubles the source-to-image receptor distance from 40 to 80 inches. To maintain receptor exposure, the mAs should be:

  1. Halved
  2. Doubled
  3. Unchanged
  4. Quadrupled Correct answer.

Explanation

By the inverse square law, doubling the distance reduces intensity to one quarter, so mAs must be increased by a factor of four to maintain exposure. This is the basis of the density maintenance formula.