HESI Radiography Exam Practice Questions
and Answers Top Rated A+ Latest Version
Question>> 1
A portable knee exam performed in the operating room results in a beam intensity of
2.5 R at 32 inches. What is the intensity of the beam if the same exposure factors are
used for a post-operative knee at a distance of 40 inches?
A. 1.60 R
B. 3.12 R
C. 3.90 R
D. 2.00 R
Answer>>
A. 1.60 R
The inverse square formula (I1/I2=D22/D21) is used to determine the new intensity:
2.5 / x = 1600 (40 squared) / 1024 (32 squared); x = (2.5) (1024) / 1600 = 1.6 R.
Question>> 2
Page 1 of 107
,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>>
C. Lamina
The lamina is the body while the pars interarticularis represents the neck. The pedicle
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,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
instructions.
B. Remain as quiet as possible to avoid waking the patient during the exam.
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, 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+ Latest Version
Question>> 1
A portable knee exam performed in the operating room results in a beam intensity of
2.5 R at 32 inches. What is the intensity of the beam if the same exposure factors are
used for a post-operative knee at a distance of 40 inches?
A. 1.60 R
B. 3.12 R
C. 3.90 R
D. 2.00 R
Answer>>
A. 1.60 R
The inverse square formula (I1/I2=D22/D21) is used to determine the new intensity:
2.5 / x = 1600 (40 squared) / 1024 (32 squared); x = (2.5) (1024) / 1600 = 1.6 R.
Question>> 2
Page 1 of 107
,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>>
C. Lamina
The lamina is the body while the pars interarticularis represents the neck. The pedicle
Page 2 of 107
,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
instructions.
B. Remain as quiet as possible to avoid waking the patient during the exam.
Page 3 of 107
, 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
