ASRT EXAM 4 NEWEST 2026 ACTUAL EXAM COMPLETE 170 QUESTIONS AND CORRECT
DETAILED ANSWERS/NEWEST UPDATE!!!
Question 1
Which of the following are used specifically to reduce the effect of scatter radiation on the
finished radiograph?
A) Intensifying screens
B) Compensating filters
C) Radiographic grids
D) Compression devices
E) Added filtration at the tube port
Correct Answer: C) Radiographic grids
Rationale: Radiographic grids are placed between the patient and the image receptor. They
consist of lead strips that absorb scatter radiation—photons that have changed direction
due to Compton interactions—before they reach the receptor, thereby improving image
contrast.
Question 2
During an intravenous urogram, the right kidney is placed perpendicular to the image receptor
when the patient is in which of the following positions?
A) Left posterior oblique (LPO)
B) Right posterior oblique (RPO)
C) Lateral
D) Supine
E) Prone
Correct Answer: B) Right posterior oblique (RPO)
Rationale: Due to the anatomical tilt of the kidneys, the kidney on the side "up" (elevated) is
placed parallel to the IR, while the kidney on the side "down" (closest to the IR) is placed
perpendicular. Therefore, in an RPO position, the right kidney is perpendicular and the left
kidney is parallel.
Question 3
Which of the following is a facial bone that also contributes to the structure of the bony orbit?
A) Temporal
B) Inferior nasal concha
C) Lacrimal
D) Frontal
E) Parietal
Correct Answer: C) Lacrimal
Rationale: The orbit is formed by seven bones: frontal, sphenoid, ethmoid, maxilla,
zygomatic, palatine, and lacrimal. While the frontal bone is part of the orbit, it is classified
as a cranial bone, not a facial bone. The lacrimal bone is a facial bone.
, 2
Question 4
When a radiographer selects the magnification mode during a fluoroscopic procedure:
A) Exposure decreases and spatial resolution decreases.
B) Exposure decreases and spatial resolution increases.
C) Exposure increases and spatial resolution decreases.
D) Exposure increases and spatial resolution increases.
E) Only the field of view changes without affecting dose.
Correct Answer: D) exposure increases and spatial resolution increases
Rationale: In magnification mode, the voltage on the electrostatic focusing lenses is
increased, focusing the electron beam from a smaller area of the input phosphor. This
results in better spatial resolution (less minification gain), but requires the Automatic
Brightness Control (ABC) to increase the x-ray tube mA to compensate for the loss of
brightness, thus increasing patient dose.
Question 5
A 51-year-old female patient has been ordered a voiding cystourethrogram (VCUG), an upper GI
(UGI), and a barium enema (BE) to be completed over two days. In what order should these
studies be conducted to avoid contrast interference?
A) Barium enema, upper GI, VCUG
B) VCUG, barium enema, upper GI
C) VCUG, upper GI, barium enema
D) Upper GI, VCUG, barium enema
E) Barium enema, VCUG, upper GI
Correct Answer: B) VCUG, barium enema, upper GI
Rationale: Exams using non-iodinated contrast (barium) should follow those using
iodinated contrast because barium is more dense and takes longer to clear the system. The
VCUG (iodine) should be first. Between the two barium studies, the lower GI (enema)
should precede the upper GI to ensure that barium from the stomach does not obscure the
anatomy of the colon.
Question 6
Which term describes a collection of disc drives that perform together as a single unit to improve
the reliability and speed of data storage in a digital system?
A) Random access memory (RAM)
B) Redundant array of independent disks (RAID)
C) Radiology information system (RIS)
D) Read-only memory (ROM)
E) Digital Imaging and Communications in Medicine (DICOM)
Correct Answer: B) redundant array of independent discs (RAID)
Rationale: RAID technology distributes data across several hard drives. This provides
, 3
redundancy; if one drive fails, the data can be recovered from the others, which is critical
for the high-volume data storage required in modern PACS environments.
Question 7
In conventional fluoroscopy, the light intensities from the output phosphor must be converted
into an electronic signal by which component to be viewed on a television monitor?
A) Charge-Coupled Device (CCD)
B) Electrostatic lenses
C) Photocathode
D) Input phosphor
E) Analog-to-digital converter (ADC)
Correct Answer: A) CCD
Rationale: The CCD is a light-sensitive semiconducting device. When light from the output
phosphor strikes the CCD, it generates an electrical charge proportional to the light
intensity, which is then sent to the monitor or an ADC for digital processing.
Question 8
Which of the following examinations is considered to have a LOW benefit-risk ratio, meaning
the risk may outweigh the clinical benefit?
A) Angiography for cardiac stent placement.
B) Head CT for suspected cerebral hemorrhage.
C) Fluoroscopic evaluation of nasal cannula placement.
D) Upper GI study to evaluate a peptic ulcer.
E) Mammography for a patient with a palpable lump.
Correct Answer: C) fluoroscopic evaluation of nasal cannula placement
Rationale: A nasal cannula is a superficial device that can be verified visually or through
simple physical assessment. Using ionizing radiation (fluoroscopy) for this purpose
provides minimal clinical benefit compared to the unnecessary radiation dose to the
patient.
Question 9
The effective focal spot size is directly affected by which of the following tube design factors?
A) Anode rotation speed
B) Filament composition
C) Target angle
D) Anode heel effect
E) Focusing cup depth
Correct Answer: C) target angle
Rationale: According to the Line-Focus Principle, the effective focal spot (the area projected
toward the patient) is smaller than the actual focal spot because of the angle of the anode
, 4
target. As the target angle decreases (becomes steeper), the effective focal spot size also
decreases.
Question 10
In an axiolateral projection of the TMJs (Schuller method), with the head in a lateral position and
the CR angled 30 degrees caudad, how will the TMJ of interest (closest to the IR) appear on the
image?
A) Projected superiorly to the other TMJ.
B) Projected inferiorly to the other TMJ.
C) Projected anteriorly to the other TMJ.
D) Projected posteriorly to the other TMJ.
E) It will be superimposed on the other TMJ.
Correct Answer: A) superiorly
Rationale: When the CR is angled caudally, the side furthest from the IR is projected in the
direction of the angle (downward). Consequently, the TMJ of interest (the one closest to the
IR) will appear "higher" or more superior on the radiograph relative to the side that was
moved by the tube angle.
Question 11
Which of the following anatomical characteristics is typical of a female pelvis compared to a
male pelvis?
A) A heavy, thick bony structure
B) A deep, narrow shape
C) An oval-shaped pelvic inlet
D) A narrow, heart-shaped inlet
E) A pubic arch angle of less than 90 degrees
Correct Answer: C) an oval-shaped inlet
Rationale: The female pelvis is adapted for childbearing; it is typically wider, shallower, and
lighter than the male pelvis. The female pelvic inlet is usually large and oval, and the pubic
arch is greater than 90 degrees.
Question 12
Which of the following statements is NOT TRUE regarding anatomically programmed
radiography (APR)?
A) It can be used in conjunction with automatic exposure control (AEC).
B) APR allows for specific anatomical part selection on the control console.
C) It displays suggested manual exposure factors for the selected part.
D) APR prevents the radiographer from making any manual adjustments to the mAs.
E) It utilizes a pre-programmed "master room" technique.
Correct Answer: D) APR prevents making adjustments to mAs
Rationale: APR provides a starting point for exposure factors based on the anatomy
DETAILED ANSWERS/NEWEST UPDATE!!!
Question 1
Which of the following are used specifically to reduce the effect of scatter radiation on the
finished radiograph?
A) Intensifying screens
B) Compensating filters
C) Radiographic grids
D) Compression devices
E) Added filtration at the tube port
Correct Answer: C) Radiographic grids
Rationale: Radiographic grids are placed between the patient and the image receptor. They
consist of lead strips that absorb scatter radiation—photons that have changed direction
due to Compton interactions—before they reach the receptor, thereby improving image
contrast.
Question 2
During an intravenous urogram, the right kidney is placed perpendicular to the image receptor
when the patient is in which of the following positions?
A) Left posterior oblique (LPO)
B) Right posterior oblique (RPO)
C) Lateral
D) Supine
E) Prone
Correct Answer: B) Right posterior oblique (RPO)
Rationale: Due to the anatomical tilt of the kidneys, the kidney on the side "up" (elevated) is
placed parallel to the IR, while the kidney on the side "down" (closest to the IR) is placed
perpendicular. Therefore, in an RPO position, the right kidney is perpendicular and the left
kidney is parallel.
Question 3
Which of the following is a facial bone that also contributes to the structure of the bony orbit?
A) Temporal
B) Inferior nasal concha
C) Lacrimal
D) Frontal
E) Parietal
Correct Answer: C) Lacrimal
Rationale: The orbit is formed by seven bones: frontal, sphenoid, ethmoid, maxilla,
zygomatic, palatine, and lacrimal. While the frontal bone is part of the orbit, it is classified
as a cranial bone, not a facial bone. The lacrimal bone is a facial bone.
, 2
Question 4
When a radiographer selects the magnification mode during a fluoroscopic procedure:
A) Exposure decreases and spatial resolution decreases.
B) Exposure decreases and spatial resolution increases.
C) Exposure increases and spatial resolution decreases.
D) Exposure increases and spatial resolution increases.
E) Only the field of view changes without affecting dose.
Correct Answer: D) exposure increases and spatial resolution increases
Rationale: In magnification mode, the voltage on the electrostatic focusing lenses is
increased, focusing the electron beam from a smaller area of the input phosphor. This
results in better spatial resolution (less minification gain), but requires the Automatic
Brightness Control (ABC) to increase the x-ray tube mA to compensate for the loss of
brightness, thus increasing patient dose.
Question 5
A 51-year-old female patient has been ordered a voiding cystourethrogram (VCUG), an upper GI
(UGI), and a barium enema (BE) to be completed over two days. In what order should these
studies be conducted to avoid contrast interference?
A) Barium enema, upper GI, VCUG
B) VCUG, barium enema, upper GI
C) VCUG, upper GI, barium enema
D) Upper GI, VCUG, barium enema
E) Barium enema, VCUG, upper GI
Correct Answer: B) VCUG, barium enema, upper GI
Rationale: Exams using non-iodinated contrast (barium) should follow those using
iodinated contrast because barium is more dense and takes longer to clear the system. The
VCUG (iodine) should be first. Between the two barium studies, the lower GI (enema)
should precede the upper GI to ensure that barium from the stomach does not obscure the
anatomy of the colon.
Question 6
Which term describes a collection of disc drives that perform together as a single unit to improve
the reliability and speed of data storage in a digital system?
A) Random access memory (RAM)
B) Redundant array of independent disks (RAID)
C) Radiology information system (RIS)
D) Read-only memory (ROM)
E) Digital Imaging and Communications in Medicine (DICOM)
Correct Answer: B) redundant array of independent discs (RAID)
Rationale: RAID technology distributes data across several hard drives. This provides
, 3
redundancy; if one drive fails, the data can be recovered from the others, which is critical
for the high-volume data storage required in modern PACS environments.
Question 7
In conventional fluoroscopy, the light intensities from the output phosphor must be converted
into an electronic signal by which component to be viewed on a television monitor?
A) Charge-Coupled Device (CCD)
B) Electrostatic lenses
C) Photocathode
D) Input phosphor
E) Analog-to-digital converter (ADC)
Correct Answer: A) CCD
Rationale: The CCD is a light-sensitive semiconducting device. When light from the output
phosphor strikes the CCD, it generates an electrical charge proportional to the light
intensity, which is then sent to the monitor or an ADC for digital processing.
Question 8
Which of the following examinations is considered to have a LOW benefit-risk ratio, meaning
the risk may outweigh the clinical benefit?
A) Angiography for cardiac stent placement.
B) Head CT for suspected cerebral hemorrhage.
C) Fluoroscopic evaluation of nasal cannula placement.
D) Upper GI study to evaluate a peptic ulcer.
E) Mammography for a patient with a palpable lump.
Correct Answer: C) fluoroscopic evaluation of nasal cannula placement
Rationale: A nasal cannula is a superficial device that can be verified visually or through
simple physical assessment. Using ionizing radiation (fluoroscopy) for this purpose
provides minimal clinical benefit compared to the unnecessary radiation dose to the
patient.
Question 9
The effective focal spot size is directly affected by which of the following tube design factors?
A) Anode rotation speed
B) Filament composition
C) Target angle
D) Anode heel effect
E) Focusing cup depth
Correct Answer: C) target angle
Rationale: According to the Line-Focus Principle, the effective focal spot (the area projected
toward the patient) is smaller than the actual focal spot because of the angle of the anode
, 4
target. As the target angle decreases (becomes steeper), the effective focal spot size also
decreases.
Question 10
In an axiolateral projection of the TMJs (Schuller method), with the head in a lateral position and
the CR angled 30 degrees caudad, how will the TMJ of interest (closest to the IR) appear on the
image?
A) Projected superiorly to the other TMJ.
B) Projected inferiorly to the other TMJ.
C) Projected anteriorly to the other TMJ.
D) Projected posteriorly to the other TMJ.
E) It will be superimposed on the other TMJ.
Correct Answer: A) superiorly
Rationale: When the CR is angled caudally, the side furthest from the IR is projected in the
direction of the angle (downward). Consequently, the TMJ of interest (the one closest to the
IR) will appear "higher" or more superior on the radiograph relative to the side that was
moved by the tube angle.
Question 11
Which of the following anatomical characteristics is typical of a female pelvis compared to a
male pelvis?
A) A heavy, thick bony structure
B) A deep, narrow shape
C) An oval-shaped pelvic inlet
D) A narrow, heart-shaped inlet
E) A pubic arch angle of less than 90 degrees
Correct Answer: C) an oval-shaped inlet
Rationale: The female pelvis is adapted for childbearing; it is typically wider, shallower, and
lighter than the male pelvis. The female pelvic inlet is usually large and oval, and the pubic
arch is greater than 90 degrees.
Question 12
Which of the following statements is NOT TRUE regarding anatomically programmed
radiography (APR)?
A) It can be used in conjunction with automatic exposure control (AEC).
B) APR allows for specific anatomical part selection on the control console.
C) It displays suggested manual exposure factors for the selected part.
D) APR prevents the radiographer from making any manual adjustments to the mAs.
E) It utilizes a pre-programmed "master room" technique.
Correct Answer: D) APR prevents making adjustments to mAs
Rationale: APR provides a starting point for exposure factors based on the anatomy
