Michigan Radiology Specialist Exam
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which imaging modality uses ionizing radiation to create cross-
sectional images of the body?
A. Ultrasound
B. Magnetic Resonance Imaging (MRI)
C. Computed Tomography (CT)
D. Positron Emission Tomography (PET)
Answer: C. Computed Tomography (CT)
Rationale: CT scanning uses ionizing X-rays that rotate around the
patient to produce cross-sectional images. Ultrasound uses sound
waves, MRI uses magnetic fields and radiofrequency pulses, and PET
uses radioactive tracers but primarily measures metabolic activity
rather than producing standard cross-sectional anatomical images.
2. What is the primary purpose of a radiographic grid?
A. Increase exposure time
B. Reduce scatter radiation
C. Increase patient dose
D. Improve image brightness only
,Answer: B. Reduce scatter radiation
Rationale: A radiographic grid absorbs scattered radiation before it
reaches the image receptor, improving image contrast and diagnostic
quality. While grid use may require increased exposure factors, its
primary function is scatter reduction.
3. Which contrast agent is most commonly used in CT imaging?
A. Barium sulfate
B. Iodinated contrast media
C. Gadolinium
D. Air
Answer: B. Iodinated contrast media
Rationale: Iodinated contrast agents are widely used in CT because
iodine’s high atomic number enhances attenuation of X-rays, improving
visualization of blood vessels and soft tissues.
4. What is the primary imaging modality for evaluating soft tissue
injuries such as ligament tears?
A. CT
B. MRI
C. X-ray
D. Fluoroscopy
Answer: B. MRI
Rationale: MRI provides superior soft-tissue contrast and is ideal for
visualizing ligaments, tendons, cartilage, and muscles without the use of
ionizing radiation.
, 5. Which radiation protection principle involves minimizing exposure
time?
A. Shielding
B. Distance
C. Time
D. Collimation
Answer: C. Time
Rationale: Radiation safety is based on three core principles: time,
distance, and shielding. Reducing the time spent near radiation sources
lowers cumulative radiation dose.
6. Which organ is most sensitive to ionizing radiation?
A. Liver
B. Thyroid
C. Bone
D. Skin
Answer: B. Thyroid
Rationale: The thyroid gland is particularly radiosensitive, especially in
younger individuals. Shielding is commonly used during imaging
procedures to protect it.
7. In radiography, what does kVp primarily control?
A. Image contrast
B. Exposure time
C. Film speed
D. Patient positioning
Answer: A. Image contrast
Rationale: Kilovoltage peak (kVp) determines the energy of the X-ray
, beam and influences image contrast. Higher kVp produces lower
contrast images with more penetrating power.
8. Which imaging technique provides real-time imaging using
continuous X-ray beams?
A. CT
B. Fluoroscopy
C. MRI
D. Ultrasound
Answer: B. Fluoroscopy
Rationale: Fluoroscopy produces real-time dynamic images by
continuously transmitting X-rays, often used during procedures such as
catheter placement and GI studies.
9. What is the standard imaging modality used for screening breast
cancer?
A. MRI
B. Mammography
C. CT
D. Ultrasound
Answer: B. Mammography
Rationale: Mammography uses low-dose X-rays specifically optimized to
detect early breast cancers, calcifications, and structural abnormalities.
10. What is the purpose of collimation in radiography?
A. Increase radiation dose
B. Reduce exposure area
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which imaging modality uses ionizing radiation to create cross-
sectional images of the body?
A. Ultrasound
B. Magnetic Resonance Imaging (MRI)
C. Computed Tomography (CT)
D. Positron Emission Tomography (PET)
Answer: C. Computed Tomography (CT)
Rationale: CT scanning uses ionizing X-rays that rotate around the
patient to produce cross-sectional images. Ultrasound uses sound
waves, MRI uses magnetic fields and radiofrequency pulses, and PET
uses radioactive tracers but primarily measures metabolic activity
rather than producing standard cross-sectional anatomical images.
2. What is the primary purpose of a radiographic grid?
A. Increase exposure time
B. Reduce scatter radiation
C. Increase patient dose
D. Improve image brightness only
,Answer: B. Reduce scatter radiation
Rationale: A radiographic grid absorbs scattered radiation before it
reaches the image receptor, improving image contrast and diagnostic
quality. While grid use may require increased exposure factors, its
primary function is scatter reduction.
3. Which contrast agent is most commonly used in CT imaging?
A. Barium sulfate
B. Iodinated contrast media
C. Gadolinium
D. Air
Answer: B. Iodinated contrast media
Rationale: Iodinated contrast agents are widely used in CT because
iodine’s high atomic number enhances attenuation of X-rays, improving
visualization of blood vessels and soft tissues.
4. What is the primary imaging modality for evaluating soft tissue
injuries such as ligament tears?
A. CT
B. MRI
C. X-ray
D. Fluoroscopy
Answer: B. MRI
Rationale: MRI provides superior soft-tissue contrast and is ideal for
visualizing ligaments, tendons, cartilage, and muscles without the use of
ionizing radiation.
, 5. Which radiation protection principle involves minimizing exposure
time?
A. Shielding
B. Distance
C. Time
D. Collimation
Answer: C. Time
Rationale: Radiation safety is based on three core principles: time,
distance, and shielding. Reducing the time spent near radiation sources
lowers cumulative radiation dose.
6. Which organ is most sensitive to ionizing radiation?
A. Liver
B. Thyroid
C. Bone
D. Skin
Answer: B. Thyroid
Rationale: The thyroid gland is particularly radiosensitive, especially in
younger individuals. Shielding is commonly used during imaging
procedures to protect it.
7. In radiography, what does kVp primarily control?
A. Image contrast
B. Exposure time
C. Film speed
D. Patient positioning
Answer: A. Image contrast
Rationale: Kilovoltage peak (kVp) determines the energy of the X-ray
, beam and influences image contrast. Higher kVp produces lower
contrast images with more penetrating power.
8. Which imaging technique provides real-time imaging using
continuous X-ray beams?
A. CT
B. Fluoroscopy
C. MRI
D. Ultrasound
Answer: B. Fluoroscopy
Rationale: Fluoroscopy produces real-time dynamic images by
continuously transmitting X-rays, often used during procedures such as
catheter placement and GI studies.
9. What is the standard imaging modality used for screening breast
cancer?
A. MRI
B. Mammography
C. CT
D. Ultrasound
Answer: B. Mammography
Rationale: Mammography uses low-dose X-rays specifically optimized to
detect early breast cancers, calcifications, and structural abnormalities.
10. What is the purpose of collimation in radiography?
A. Increase radiation dose
B. Reduce exposure area
