HESI Radiography Exam Practice Questions
and Answers Top Rated A+
Question>> 1
A radiographer makes an exposure using an 8:1, 100 line per inch grid. When
processing the image plate (IP) through the reader, the radiographer notices that a
Moire pattern is seen on the displayed image. What is the probable cause of this
artifact?
A. The IP was not fully erased the last time it was used.
B. The grid had a frequency similar to the reader's sampling frequency.
C. Underexposure to the IP.
D. The IP was upside down in the bucky tray.
Answer>>
B. The grid had a frequency similar to the reader's sampling frequency.
Moire artifacts on digital images occur when the frequency of the grid closely matches
the sampling frequency of the CR reader.
Page 1 of 107
,Question>> 2
Which aspect of electrical power is responsible for accelerating electrons in an x-ray
tube?
A. Current flow
B. Resistive heat
C. Total wattage
D. Potential difference
Answer>>
D. Potential difference
Selected kVp, also known as potential difference, accelerates electrons crossing an x-
ray tube.
Question>> 3
In a properly positioned oblique lumbar spine radiograph, what makes up the "body"
of the "Scotty dog?"
A. Pedicle
B. Pars interarticularis
C. Lamina
D. Superior articular process
Answer>>
Page 2 of 107
,C. Lamina
The lamina is the body while the pars interarticularis represents the neck. The pedicle
is the eye of the Scotty dog. The ear is the superior articular process.
Question>> 4
Which steps increase contrast in fluoroscopy? (Select the two that apply.)
A. Increase kVp
B. Use a smaller collimator field
C. Use a larger collimator field
D. Increase mA
E. Reduce kVp
Answer>>
B. Use a smaller collimator field
E. Reduce kVp
Using a smaller collimator field increases contrast, by reducing scatter and secondary
radiation production, and thus reducing fog. Reducing kVp increases contrast, at the
risk of lowered penetration.
Question>> 5
Which rule is followed when examining unconscious patients?
A. Proceed as if the patient were conscious, asking Question>>s and giving
Page 3 of 107
, instructions.
B. Remain as quiet as possible to avoid waking the patient during the exam.
C. Speak openly in front of the patient, since they cannot hear or understand you.
D. Avoid saying things you would not say to a conscious patient.
Answer>>
D. Avoid saying things you would not say to a conscious patient.
Unconscious patients may retain the ability to hear and remember what is said, so it is
appropriate to avoid making statements that you would not make if they were
conscious.
Question>> 6
What is the longest field size dimension allowable for 10 inches by 12 inches
collimation at a 40 inch source to image distance (SID)?
A. 10.6 inches
B. 13.2 inches
C. 12.8 inches
D. 11.4 inches
Answer>>
C. 12.8 inches
Field size may be off +/- 2% of the SID, which in this case is 0.8 inches. 12.8 inches is in
the acceptable range.
Page 4 of 107
and Answers Top Rated A+
Question>> 1
A radiographer makes an exposure using an 8:1, 100 line per inch grid. When
processing the image plate (IP) through the reader, the radiographer notices that a
Moire pattern is seen on the displayed image. What is the probable cause of this
artifact?
A. The IP was not fully erased the last time it was used.
B. The grid had a frequency similar to the reader's sampling frequency.
C. Underexposure to the IP.
D. The IP was upside down in the bucky tray.
Answer>>
B. The grid had a frequency similar to the reader's sampling frequency.
Moire artifacts on digital images occur when the frequency of the grid closely matches
the sampling frequency of the CR reader.
Page 1 of 107
,Question>> 2
Which aspect of electrical power is responsible for accelerating electrons in an x-ray
tube?
A. Current flow
B. Resistive heat
C. Total wattage
D. Potential difference
Answer>>
D. Potential difference
Selected kVp, also known as potential difference, accelerates electrons crossing an x-
ray tube.
Question>> 3
In a properly positioned oblique lumbar spine radiograph, what makes up the "body"
of the "Scotty dog?"
A. Pedicle
B. Pars interarticularis
C. Lamina
D. Superior articular process
Answer>>
Page 2 of 107
,C. Lamina
The lamina is the body while the pars interarticularis represents the neck. The pedicle
is the eye of the Scotty dog. The ear is the superior articular process.
Question>> 4
Which steps increase contrast in fluoroscopy? (Select the two that apply.)
A. Increase kVp
B. Use a smaller collimator field
C. Use a larger collimator field
D. Increase mA
E. Reduce kVp
Answer>>
B. Use a smaller collimator field
E. Reduce kVp
Using a smaller collimator field increases contrast, by reducing scatter and secondary
radiation production, and thus reducing fog. Reducing kVp increases contrast, at the
risk of lowered penetration.
Question>> 5
Which rule is followed when examining unconscious patients?
A. Proceed as if the patient were conscious, asking Question>>s and giving
Page 3 of 107
, instructions.
B. Remain as quiet as possible to avoid waking the patient during the exam.
C. Speak openly in front of the patient, since they cannot hear or understand you.
D. Avoid saying things you would not say to a conscious patient.
Answer>>
D. Avoid saying things you would not say to a conscious patient.
Unconscious patients may retain the ability to hear and remember what is said, so it is
appropriate to avoid making statements that you would not make if they were
conscious.
Question>> 6
What is the longest field size dimension allowable for 10 inches by 12 inches
collimation at a 40 inch source to image distance (SID)?
A. 10.6 inches
B. 13.2 inches
C. 12.8 inches
D. 11.4 inches
Answer>>
C. 12.8 inches
Field size may be off +/- 2% of the SID, which in this case is 0.8 inches. 12.8 inches is in
the acceptable range.
Page 4 of 107
