RAD 121 EXAM REVIEW QUESTIONS WITH VERIFIED
ANSWERS
FALSE - Answers - X-rays carry a negative charge that causes ionization.
3 ONLY - Answers - A radiographer uses a head unit to perform skull radiography on an
adult. He selects a diaphragm with a 10 x 12 aperture to limit the size of the
radiographic beam to the image receptor. For the lateral projections, the long axis of the
diaphragm is placed parallel with the long axis of the film. However, the radiographer
does not place the long axis of the diaphragm parallel with the long axis of the film for
the PA and AP axial projections. Following processing, film evaluation of the PA and the
AP axial projections reveal:
1. blurring of the recorded image
2. decreased sharpness of the recorded image as a consequence of the patient
receiving more off-focus radiation
3. the occurrence of diaphragm cutoff resulting in large, unexposed areas
SID - Answers - Which of the following has the greatest effect on radiographic density?
Select one:
a. Aluminum filtration
b. Kilovoltage
c. SID
d. Scattered radiation
ALL OF THE ABOVE - Answers - The distracting area of increased brightness
surrounding a collimated image can be removed from the displayed digital image by:
Select one:
a. masking.
b. shuttering.
c. electronic collimation.
d. all of the above.
35 KEV - Answers - Photoelectric interactions with matter usually occur at what
kiloelectron volt?
1 AND 2 - Answers - An increase in kVp will have which of the following effects?
1. More scattered radiation will be produced.
2. The exposure rate will increase.
3. Radiographic contrast will increase.
37° AP axial of the skull - Answers - Which of the following will produce the greatest
distortion?
Select one:
a. AP projection of the skull
,b. PA projection of the skull
c. 37° AP axial of the skull
d. 20° PA axial of the skull
1,2, AND 3 - Answers - The photoelectric effect is the interaction between x-ray photons
and matter that is largely responsible for patient dose. The photoelectric effect is likely
to occur under which of the following conditions?
1. With absorbers of high atomic number
2. With low-energy incident photons
3. With use of positive contrast media
HIGH-FREQUENCY - Answers - Setting identical exposure factors, which type of x-ray
unit will produce the greatest heat?
TRUE - Answers - When the target angle is less than 45°, the effective focal spot is
smaller than the actual focal spot.
A. DISPLAY MONITOR - Answers - The DICOM GSDF is used to evaluate the:
Select one:
a. display monitor.
b. image processor.
c. histogram analysis.
d. digital imaging system.
CAMERA TUBE - Answers - Vidicon refers to a type of:
Select one:
a. television monitor.
b. camera tube.
c. CCD.
d. fiber optics.
1 AND 2 - Answers - Radiographic contrast is a result of:
1. differential tissue absorption.
2. emulsion characteristics.
3. proper regulation of mAs.
PHOTOELECTRIC INTERACTION - Answers - The interaction between x-ray photons
and tissue that results in production of a secondary x-ray photon is the:
Select one:
a. coherent interaction.
b. Compton interaction.
c. photoelectric interaction.
d. characteristic interaction.
1.3 - Answers - If a 30/23/15 cm image intensifier is operated in the 23 cm mode, the
fluoroscopic image will be magnified by a factor of:
, Select one:
a. 1.3.
b. 1.5.
c. 1.7.
d. 2.
1,3 AND 4 - Answers - A 5- to 7-degree central ray angulation is used for a lateral knee
projection
1. to project the medial condyle anterosuperiorly.
2. on a patient with a narrow pelvis and long femora.
3. to offset the reduction in medial inclination that occurs when the patient is in a lateral
recumbent position.
4. to achieve an open femorotibial joint space.
C - Answers - An AP knee projection on a patient with an ASIS to tabletop
measurement of 17 cm was obtained using a perpendicular central ray. The resulting
image will demonstrate
Select one:
a. an open knee joint.
b. an elongated fibular head.
c. the fibular head more than 0.5 inch (1.25 cm) from the tibial plateau.
d. the anterior tibial margin distal to the posterior tibial margin.
1 AND 2 - Answers - Voluntary motion can
1. result from patient breathing.
2. be controlled by using a short exposure time.
3. result from peristaltic activity.
4. be identified as sharp bony cortices and blurry gastric and intestinal gases.
1 ONLY - Answers - Recorded detail is directly related to
1. source-image distance (SID).
2. tube current.
3. focal spot size.
a. Larger diameters increase heat-loading capabilities - Answers - What effect does the
diameter of the rotating anode disk have on the operation of the x-ray tube.
Select one:
a. Larger diameters increase heat-loading capabilities
b. Smaller diameters possess higher rotational speeds
c. Smaller diameters have smaller FSSs
d. Larger diameters decrease image resolution
TRUE - Answers - The chance that an incident x-ray will strike an inner shell orbiting
electron increases greatly when the atomic number of the tissue increases.
ANSWERS
FALSE - Answers - X-rays carry a negative charge that causes ionization.
3 ONLY - Answers - A radiographer uses a head unit to perform skull radiography on an
adult. He selects a diaphragm with a 10 x 12 aperture to limit the size of the
radiographic beam to the image receptor. For the lateral projections, the long axis of the
diaphragm is placed parallel with the long axis of the film. However, the radiographer
does not place the long axis of the diaphragm parallel with the long axis of the film for
the PA and AP axial projections. Following processing, film evaluation of the PA and the
AP axial projections reveal:
1. blurring of the recorded image
2. decreased sharpness of the recorded image as a consequence of the patient
receiving more off-focus radiation
3. the occurrence of diaphragm cutoff resulting in large, unexposed areas
SID - Answers - Which of the following has the greatest effect on radiographic density?
Select one:
a. Aluminum filtration
b. Kilovoltage
c. SID
d. Scattered radiation
ALL OF THE ABOVE - Answers - The distracting area of increased brightness
surrounding a collimated image can be removed from the displayed digital image by:
Select one:
a. masking.
b. shuttering.
c. electronic collimation.
d. all of the above.
35 KEV - Answers - Photoelectric interactions with matter usually occur at what
kiloelectron volt?
1 AND 2 - Answers - An increase in kVp will have which of the following effects?
1. More scattered radiation will be produced.
2. The exposure rate will increase.
3. Radiographic contrast will increase.
37° AP axial of the skull - Answers - Which of the following will produce the greatest
distortion?
Select one:
a. AP projection of the skull
,b. PA projection of the skull
c. 37° AP axial of the skull
d. 20° PA axial of the skull
1,2, AND 3 - Answers - The photoelectric effect is the interaction between x-ray photons
and matter that is largely responsible for patient dose. The photoelectric effect is likely
to occur under which of the following conditions?
1. With absorbers of high atomic number
2. With low-energy incident photons
3. With use of positive contrast media
HIGH-FREQUENCY - Answers - Setting identical exposure factors, which type of x-ray
unit will produce the greatest heat?
TRUE - Answers - When the target angle is less than 45°, the effective focal spot is
smaller than the actual focal spot.
A. DISPLAY MONITOR - Answers - The DICOM GSDF is used to evaluate the:
Select one:
a. display monitor.
b. image processor.
c. histogram analysis.
d. digital imaging system.
CAMERA TUBE - Answers - Vidicon refers to a type of:
Select one:
a. television monitor.
b. camera tube.
c. CCD.
d. fiber optics.
1 AND 2 - Answers - Radiographic contrast is a result of:
1. differential tissue absorption.
2. emulsion characteristics.
3. proper regulation of mAs.
PHOTOELECTRIC INTERACTION - Answers - The interaction between x-ray photons
and tissue that results in production of a secondary x-ray photon is the:
Select one:
a. coherent interaction.
b. Compton interaction.
c. photoelectric interaction.
d. characteristic interaction.
1.3 - Answers - If a 30/23/15 cm image intensifier is operated in the 23 cm mode, the
fluoroscopic image will be magnified by a factor of:
, Select one:
a. 1.3.
b. 1.5.
c. 1.7.
d. 2.
1,3 AND 4 - Answers - A 5- to 7-degree central ray angulation is used for a lateral knee
projection
1. to project the medial condyle anterosuperiorly.
2. on a patient with a narrow pelvis and long femora.
3. to offset the reduction in medial inclination that occurs when the patient is in a lateral
recumbent position.
4. to achieve an open femorotibial joint space.
C - Answers - An AP knee projection on a patient with an ASIS to tabletop
measurement of 17 cm was obtained using a perpendicular central ray. The resulting
image will demonstrate
Select one:
a. an open knee joint.
b. an elongated fibular head.
c. the fibular head more than 0.5 inch (1.25 cm) from the tibial plateau.
d. the anterior tibial margin distal to the posterior tibial margin.
1 AND 2 - Answers - Voluntary motion can
1. result from patient breathing.
2. be controlled by using a short exposure time.
3. result from peristaltic activity.
4. be identified as sharp bony cortices and blurry gastric and intestinal gases.
1 ONLY - Answers - Recorded detail is directly related to
1. source-image distance (SID).
2. tube current.
3. focal spot size.
a. Larger diameters increase heat-loading capabilities - Answers - What effect does the
diameter of the rotating anode disk have on the operation of the x-ray tube.
Select one:
a. Larger diameters increase heat-loading capabilities
b. Smaller diameters possess higher rotational speeds
c. Smaller diameters have smaller FSSs
d. Larger diameters decrease image resolution
TRUE - Answers - The chance that an incident x-ray will strike an inner shell orbiting
electron increases greatly when the atomic number of the tissue increases.
