HESI V1 Safety Radiology, HESI V1 Image Production
Radiology, HESI V1 Patient Care Radiology, HESI V1
Procedures Radiology
For which long term effect is a 28-year-old radiographer with a
cumulative effective dose (CumEfD) of 200 mSv (20 rem) at an
increased risk?
ANSWERS: Cancer.
The majority of x-rays in the useful beam are created as a result of
which process?
ANSWERS: Fast-moving electrons approach the nucleus ofthe
target atom and slow down.
As a result of imaging pregnant patients, which is the fetal exposure
for most radiographic exams?
ANSWERS: Less than 0.01 gray (1 rad).
Which aspect of electrical power is responsible for accelerating
electrons in an x-ray tube?
ANSWERS: Potential difference.
,What causes the build-up of heat at the anode?
ANSWERS: Electrons colliding with the target.
Which type of personnel dose monitoring devices is the best choice
to monitor the whole body dosage of radiographers?
ANSWERS: Optically stimulated luminescent dosimeter (OSL).
Which statement correctly describes the LD 50/30?
ANSWERS: Lethal dose for 50% of the population in 30 days.
A Bremsstrahlung interaction is best described by which statement?
ANSWERS: An electron is slowed and changes direction.
A portable knee exam performed in the operating room results in a
beam
intensity of 2.5 milligray (mgy) 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?
ANSWERS: 1.60 mgy.
I1/I2=(D2/D1)^2
,What characteristics do high linear energy transfer (LET) radiations
have when compared with low-LET radiation?
ANSWERS: Increased mass, decreased penetration.
Which term describes the process by which most x-ray-induced
cellular damage occurs?
ANSWERS: Indirect effect
What is the term for a reduction in x-ray photon intensity as it
passes through the patient?
ANSWERS: Attenuation.
Which accurately describes the radiation dose absorbed by bone
marrow?
ANSWERS: The dose will be less than the entrance skin exposure.
Which condition must be met before diagnostically useful
characteristic x- rays can be produced?
ANSWERS: An inner shell electron must be completely removed.
What is the dose-response relationship of radiation-induced skin
cancer?
ANSWERS: Threshold.
, Where is the safest place for the radiographer to stand during
fluoroscopy?
ANSWERS: 90 degrees and one meter from the patient.
What is the dose area product (DAP) if the collimated field is 10 X 10
cm with a dose of 2 milligray (mgy)/minute?
ANSWERS: 200 mgy per cm
squared. (10cmx10cm)x(2
mgy/minute)
Which term describes stray radiation that is emitted through the x-ray
tube housing?
ANSWERS: Leakage
What type of relationship does cell growth rate have on the
sensitivity of tissues to ionizing radiation?
ANSWERS: Direct.
How much can exposure to the lens of the eyes be reduced by
utilizing the posteroanterior (PA) projection of the cranium over the
anteroposterior
(AP) projection?
ANSWERS: 95%.
Radiology, HESI V1 Patient Care Radiology, HESI V1
Procedures Radiology
For which long term effect is a 28-year-old radiographer with a
cumulative effective dose (CumEfD) of 200 mSv (20 rem) at an
increased risk?
ANSWERS: Cancer.
The majority of x-rays in the useful beam are created as a result of
which process?
ANSWERS: Fast-moving electrons approach the nucleus ofthe
target atom and slow down.
As a result of imaging pregnant patients, which is the fetal exposure
for most radiographic exams?
ANSWERS: Less than 0.01 gray (1 rad).
Which aspect of electrical power is responsible for accelerating
electrons in an x-ray tube?
ANSWERS: Potential difference.
,What causes the build-up of heat at the anode?
ANSWERS: Electrons colliding with the target.
Which type of personnel dose monitoring devices is the best choice
to monitor the whole body dosage of radiographers?
ANSWERS: Optically stimulated luminescent dosimeter (OSL).
Which statement correctly describes the LD 50/30?
ANSWERS: Lethal dose for 50% of the population in 30 days.
A Bremsstrahlung interaction is best described by which statement?
ANSWERS: An electron is slowed and changes direction.
A portable knee exam performed in the operating room results in a
beam
intensity of 2.5 milligray (mgy) 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?
ANSWERS: 1.60 mgy.
I1/I2=(D2/D1)^2
,What characteristics do high linear energy transfer (LET) radiations
have when compared with low-LET radiation?
ANSWERS: Increased mass, decreased penetration.
Which term describes the process by which most x-ray-induced
cellular damage occurs?
ANSWERS: Indirect effect
What is the term for a reduction in x-ray photon intensity as it
passes through the patient?
ANSWERS: Attenuation.
Which accurately describes the radiation dose absorbed by bone
marrow?
ANSWERS: The dose will be less than the entrance skin exposure.
Which condition must be met before diagnostically useful
characteristic x- rays can be produced?
ANSWERS: An inner shell electron must be completely removed.
What is the dose-response relationship of radiation-induced skin
cancer?
ANSWERS: Threshold.
, Where is the safest place for the radiographer to stand during
fluoroscopy?
ANSWERS: 90 degrees and one meter from the patient.
What is the dose area product (DAP) if the collimated field is 10 X 10
cm with a dose of 2 milligray (mgy)/minute?
ANSWERS: 200 mgy per cm
squared. (10cmx10cm)x(2
mgy/minute)
Which term describes stray radiation that is emitted through the x-ray
tube housing?
ANSWERS: Leakage
What type of relationship does cell growth rate have on the
sensitivity of tissues to ionizing radiation?
ANSWERS: Direct.
How much can exposure to the lens of the eyes be reduced by
utilizing the posteroanterior (PA) projection of the cranium over the
anteroposterior
(AP) projection?
ANSWERS: 95%.
