Ohio GXMO Study Guide Review Exam| Complete
Exam Questions and CORRECT Answers| (2025
update) Assured success
OHIO GXMO
TOUGHEST & MOST-TESTED LONG CASE-BASED QUESTIONS
1. Radiation Safety – ALARA Priority
A 6-year-old pediatric patient is ordered for a chest x-ray. The patient is anxious and moving. The parent
offers to hold the child during exposure.
What is the MOST appropriate action?
A. Allow the parent to hold the child with a lead apron
B. Proceed quickly without shielding
C. Immobilize the child using approved devices and shield when possible
D. Cancel the exam immediately
✅ Correct Answer: C
Rationale:
GXMO exams prioritize ALARA. Approved immobilization devices reduce motion without exposing
others. Parents should not hold patients unless absolutely necessary.
2. Inverse Square Law – Operator Exposure
A GXMO steps back from 3 feet to 6 feet from the x-ray source during exposure.
What happens to radiation exposure?
,A. It doubles
B. It decreases by half
C. It decreases to one-fourth
D. It remains the same
✅ Correct Answer: C
Rationale:
Doubling distance → ¼ exposure. This law is one of the MOST tested GXMO concepts.
3. Image Quality – Underexposure
A radiograph appears too light, with poor visualization of anatomy. Positioning and collimation were
correct.
What is the BEST correction?
A. Increase kVp
B. Increase mAs
C. Decrease SID
D. Increase OID
✅ Correct Answer: B
Rationale:
mAs controls image density (brightness). Light image = increase mAs.
4. Biological Effects – Stochastic vs Deterministic
A patient asks why shielding is important if they “won’t feel anything.”
Which risk best explains the need for shielding?
A. Skin burns
B. Cataracts
C. Cancer development
D. Hair loss
✅ Correct Answer: C
Rationale:
Cancer is a stochastic effect — no threshold, probability increases with dose.
5. Pregnancy Screening (VERY TESTED)
A 24-year-old female is scheduled for a lumbar spine x-ray. She states, “I don’t think I’m pregnant.”
, What is the GXMO’s BEST action?
A. Proceed immediately
B. Ask the patient to sign a waiver
C. Verify pregnancy status according to facility policy before exposure
D. Cancel the exam permanently
✅ Correct Answer: C
Rationale:
GXMO must verify pregnancy status before exposure — this is a licensing issue.
6. Legal Scope of Practice
A physician asks a GXMO to perform fluoroscopy due to staff shortage.
What should the GXMO do?
A. Perform the exam under supervision
B. Perform only one image
C. Refuse and explain it is outside GXMO scope
D. Ask another GXMO for help
✅ Correct Answer: C
Rationale:
GXMO cannot perform fluoroscopy under any circumstances.
7. Image Distortion – OID
A wrist x-ray shows magnification and loss of detail.
What likely caused this?
A. Low kVp
B. High mAs
C. Increased object-to-image distance
D. Excessive collimation
✅ Correct Answer: C
Rationale:
Increased OID → magnification & distortion.
8. Repeat Exposures (HIGH RISK EXAM AREA)
An image is slightly rotated but still diagnostic.
Exam Questions and CORRECT Answers| (2025
update) Assured success
OHIO GXMO
TOUGHEST & MOST-TESTED LONG CASE-BASED QUESTIONS
1. Radiation Safety – ALARA Priority
A 6-year-old pediatric patient is ordered for a chest x-ray. The patient is anxious and moving. The parent
offers to hold the child during exposure.
What is the MOST appropriate action?
A. Allow the parent to hold the child with a lead apron
B. Proceed quickly without shielding
C. Immobilize the child using approved devices and shield when possible
D. Cancel the exam immediately
✅ Correct Answer: C
Rationale:
GXMO exams prioritize ALARA. Approved immobilization devices reduce motion without exposing
others. Parents should not hold patients unless absolutely necessary.
2. Inverse Square Law – Operator Exposure
A GXMO steps back from 3 feet to 6 feet from the x-ray source during exposure.
What happens to radiation exposure?
,A. It doubles
B. It decreases by half
C. It decreases to one-fourth
D. It remains the same
✅ Correct Answer: C
Rationale:
Doubling distance → ¼ exposure. This law is one of the MOST tested GXMO concepts.
3. Image Quality – Underexposure
A radiograph appears too light, with poor visualization of anatomy. Positioning and collimation were
correct.
What is the BEST correction?
A. Increase kVp
B. Increase mAs
C. Decrease SID
D. Increase OID
✅ Correct Answer: B
Rationale:
mAs controls image density (brightness). Light image = increase mAs.
4. Biological Effects – Stochastic vs Deterministic
A patient asks why shielding is important if they “won’t feel anything.”
Which risk best explains the need for shielding?
A. Skin burns
B. Cataracts
C. Cancer development
D. Hair loss
✅ Correct Answer: C
Rationale:
Cancer is a stochastic effect — no threshold, probability increases with dose.
5. Pregnancy Screening (VERY TESTED)
A 24-year-old female is scheduled for a lumbar spine x-ray. She states, “I don’t think I’m pregnant.”
, What is the GXMO’s BEST action?
A. Proceed immediately
B. Ask the patient to sign a waiver
C. Verify pregnancy status according to facility policy before exposure
D. Cancel the exam permanently
✅ Correct Answer: C
Rationale:
GXMO must verify pregnancy status before exposure — this is a licensing issue.
6. Legal Scope of Practice
A physician asks a GXMO to perform fluoroscopy due to staff shortage.
What should the GXMO do?
A. Perform the exam under supervision
B. Perform only one image
C. Refuse and explain it is outside GXMO scope
D. Ask another GXMO for help
✅ Correct Answer: C
Rationale:
GXMO cannot perform fluoroscopy under any circumstances.
7. Image Distortion – OID
A wrist x-ray shows magnification and loss of detail.
What likely caused this?
A. Low kVp
B. High mAs
C. Increased object-to-image distance
D. Excessive collimation
✅ Correct Answer: C
Rationale:
Increased OID → magnification & distortion.
8. Repeat Exposures (HIGH RISK EXAM AREA)
An image is slightly rotated but still diagnostic.
