COMPREHENSIVE ABR DIAGNOSTIC RADIOLOGY
CORE EXAM TESTBANK: 200 VERIFIED
QUESTIONS WITH DETAILED RATIONALES,
COVERING PHYSICS, ORGAN SYSTEMS, SAFETY,
AND IMAGING MODALITIES FOR 2026 SUCCESS.
📝 20 Sample Questions & Rationales
Question 1
Which of the following best describes the
photoelectric effect?
A. Incident photon is scattered with reduced
energy
B. Incident photon is totally absorbed, ejecting
an inner-shell electron
C. Incident photon pairs produce an electron
and positron
D. Incident photon causes nuclear excitation
, ☑VERIFIED ANSWER: B
Rationale: In the photoelectric effect, the
incident photon is totally absorbed by the atom
when it transfers all its energy to an inner-shell
electron, causing the electron to be ejected
from the atom. This interaction is a primary
source of contrast in diagnostic imaging .
Question 2
What is the approximate conversion of energy
in an x-ray tube?
A. 50% heat, 50% x-ray
B. 99% heat, 1% x-ray
C. 90% heat, 10% x-ray
D. 75% heat, 25% x-ray
☑VERIFIED ANSWER: B
Rationale: The production of x-rays in a tube is
very inefficient. Approximately 99% of the
kinetic energy of the electrons is converted into
,heat, with only about 1% being converted into
x-ray photons .
Question 3
A 6-month-old infant presents with projectile
vomiting. An upper GI series shows a narrowed,
elongated pyloric channel with a "railroad
track" appearance. What is the diagnosis?
A. Duodenal atresia
B. Hypertrophic pyloric stenosis
C. Midgut volvulus
D. Intussusception
☑VERIFIED ANSWER: B
Rationale: The "railroad track" or "string" sign
on an upper GI series is a classic finding of
hypertrophic pyloric stenosis, caused by the
narrowed and elongated pyloric channel .
Question 4
Which of the following is the most accurate
, method for measuring the glomerular filtration
rate (GFR) using nuclear medicine?
A. Renal uptake of Tc-99m DTPA
B. Tc-99m DTPA clearance
C. I-123 Hippuran clearance
D. Tc-99m MAG3 clearance
☑VERIFIED ANSWER: B
Rationale: Tc-99m DTPA is a glomerular
filtration agent. Its clearance rate provides an
accurate estimate of GFR. MAG3 and Hippuran
are primarily used for effective renal plasma
flow (ERPF) .
Question 5
In the setting of acute aortic dissection, which
imaging finding is most definitive for diagnosis
on a contrast-enhanced CT?
A. Pericardial effusion
B. Intimal flap separating true and false lumens
CORE EXAM TESTBANK: 200 VERIFIED
QUESTIONS WITH DETAILED RATIONALES,
COVERING PHYSICS, ORGAN SYSTEMS, SAFETY,
AND IMAGING MODALITIES FOR 2026 SUCCESS.
📝 20 Sample Questions & Rationales
Question 1
Which of the following best describes the
photoelectric effect?
A. Incident photon is scattered with reduced
energy
B. Incident photon is totally absorbed, ejecting
an inner-shell electron
C. Incident photon pairs produce an electron
and positron
D. Incident photon causes nuclear excitation
, ☑VERIFIED ANSWER: B
Rationale: In the photoelectric effect, the
incident photon is totally absorbed by the atom
when it transfers all its energy to an inner-shell
electron, causing the electron to be ejected
from the atom. This interaction is a primary
source of contrast in diagnostic imaging .
Question 2
What is the approximate conversion of energy
in an x-ray tube?
A. 50% heat, 50% x-ray
B. 99% heat, 1% x-ray
C. 90% heat, 10% x-ray
D. 75% heat, 25% x-ray
☑VERIFIED ANSWER: B
Rationale: The production of x-rays in a tube is
very inefficient. Approximately 99% of the
kinetic energy of the electrons is converted into
,heat, with only about 1% being converted into
x-ray photons .
Question 3
A 6-month-old infant presents with projectile
vomiting. An upper GI series shows a narrowed,
elongated pyloric channel with a "railroad
track" appearance. What is the diagnosis?
A. Duodenal atresia
B. Hypertrophic pyloric stenosis
C. Midgut volvulus
D. Intussusception
☑VERIFIED ANSWER: B
Rationale: The "railroad track" or "string" sign
on an upper GI series is a classic finding of
hypertrophic pyloric stenosis, caused by the
narrowed and elongated pyloric channel .
Question 4
Which of the following is the most accurate
, method for measuring the glomerular filtration
rate (GFR) using nuclear medicine?
A. Renal uptake of Tc-99m DTPA
B. Tc-99m DTPA clearance
C. I-123 Hippuran clearance
D. Tc-99m MAG3 clearance
☑VERIFIED ANSWER: B
Rationale: Tc-99m DTPA is a glomerular
filtration agent. Its clearance rate provides an
accurate estimate of GFR. MAG3 and Hippuran
are primarily used for effective renal plasma
flow (ERPF) .
Question 5
In the setting of acute aortic dissection, which
imaging finding is most definitive for diagnosis
on a contrast-enhanced CT?
A. Pericardial effusion
B. Intimal flap separating true and false lumens
