Mock Exam #1 Study Guide Questions
and Actual Answers.
Why must alternating current (AC) be used in the x-ray circuit?
-Transformers cannot work without AC
-Electrons cannot flow without AC
-X-ray tube must have AC to produce x-rays
-AC is the only type of current available - Answer -Transformers cannot work without AC
AC must be used in the x-ray circuit because transformers cannot work without AC. Rectifiers
are used to convert alternating current to direct current before it reaches the x-ray tube.
What is the most likely effect of a large radiation exposure during the first few days of
pregnancy?
-Anencephaly
-Neonatal death
-Intellectual disability
-Prenatal death - Answer -Prenatal death
Occurs in the womb
Underexposure using digital image receptors will result in:
-Decreased spatial resolution
-Photon Saturation
-Quantum noise
-Electronic noise - Answer -Quantum noise
Excessive noise on digital images lessens diagnostic acuity for the viewer and is generally
considered a measure of suboptimum image quality.
Which of the following would be considered a fomite?
,-Used positioning sponge
-Spider
-Muddy puddle
-Sterile gloves - Answer -Used positioning sponge
A fomite is an object that has been in contact with pathogenic organisms (catheter, imaging
table, contaminated gloves)
A patient who is moderately hypoglycemic would benefit from which of the following?
-Glass of water
-Glass of orange juice
-Bag of pretzels
-Insulin injection - Answer -Glass of orange juice
Hypoglycemia is the medical term for low blood sugar.
Expectant mothers who are technologists should wear a fetal dosimeter at what location?
-At the collar
-At the thyroid
-At the waist
-Outside the apron - Answer -At the waist
As object-to-image distance (OID) is increased, magnification will:
-Increase
-Decrease
-Remain the same - Answer -Increase
Magnification increases when the part is farther away from the image receptor. This is why it's
important to minimize OID.
What type of personnel dosimeter uses aluminum oxide as the absorbing material?
, -Optimally stimulable luminescent dosimeter (OSL)
-Film badge
-Thermoluminescent dosimeter (TLD)
-Pocket dosimeter - Answer -Optimally stimulable luminescent dosimeter (OSL)
The dosimeter is "read out" by using laser light at selected frequencies. When such laser light is
incident on the absorbing material, it becomes luminescent in proportion to the amount of
radiation exposure received.
Limb-stunting anencephaly, and evisceration are all examples of:
-Carcinogenic effects
-Lethal effects
-Cerebral effects
-Teratogenic effects - Answer -Teratogenic effects
Teratogenic effects are effects of radiation on the embryo fetus in utero that depend on the fetal
stage of development and the radiation dose received.
If a radiograph was taken using a 40-inch source-to-image distance (SID) and the image was
repeated using an 80-inch SID, what change would be needed to maintain image receptor
exposure?
-Double the milliampere-seconds (mAs)
-Increase the milliampere-seconds (mAs) by four times
-Double the kilovoltage peak (kVp)
-Increase the kilovoltage peak (kVp) by four times - Answer -Increase the milliampere-
seconds (mAs) by four times
According to the inverse square law, when SID is doubled, the intensity of the x-ray beam will
decrease by a factor of 4. This is why mAs has to be increased by a factor of 4 as well.
Low-energy x-ray photons absorbed in the patient's skin will usually result in increased:
-Detector exposure
-Scatter production
-Patient exposure
and Actual Answers.
Why must alternating current (AC) be used in the x-ray circuit?
-Transformers cannot work without AC
-Electrons cannot flow without AC
-X-ray tube must have AC to produce x-rays
-AC is the only type of current available - Answer -Transformers cannot work without AC
AC must be used in the x-ray circuit because transformers cannot work without AC. Rectifiers
are used to convert alternating current to direct current before it reaches the x-ray tube.
What is the most likely effect of a large radiation exposure during the first few days of
pregnancy?
-Anencephaly
-Neonatal death
-Intellectual disability
-Prenatal death - Answer -Prenatal death
Occurs in the womb
Underexposure using digital image receptors will result in:
-Decreased spatial resolution
-Photon Saturation
-Quantum noise
-Electronic noise - Answer -Quantum noise
Excessive noise on digital images lessens diagnostic acuity for the viewer and is generally
considered a measure of suboptimum image quality.
Which of the following would be considered a fomite?
,-Used positioning sponge
-Spider
-Muddy puddle
-Sterile gloves - Answer -Used positioning sponge
A fomite is an object that has been in contact with pathogenic organisms (catheter, imaging
table, contaminated gloves)
A patient who is moderately hypoglycemic would benefit from which of the following?
-Glass of water
-Glass of orange juice
-Bag of pretzels
-Insulin injection - Answer -Glass of orange juice
Hypoglycemia is the medical term for low blood sugar.
Expectant mothers who are technologists should wear a fetal dosimeter at what location?
-At the collar
-At the thyroid
-At the waist
-Outside the apron - Answer -At the waist
As object-to-image distance (OID) is increased, magnification will:
-Increase
-Decrease
-Remain the same - Answer -Increase
Magnification increases when the part is farther away from the image receptor. This is why it's
important to minimize OID.
What type of personnel dosimeter uses aluminum oxide as the absorbing material?
, -Optimally stimulable luminescent dosimeter (OSL)
-Film badge
-Thermoluminescent dosimeter (TLD)
-Pocket dosimeter - Answer -Optimally stimulable luminescent dosimeter (OSL)
The dosimeter is "read out" by using laser light at selected frequencies. When such laser light is
incident on the absorbing material, it becomes luminescent in proportion to the amount of
radiation exposure received.
Limb-stunting anencephaly, and evisceration are all examples of:
-Carcinogenic effects
-Lethal effects
-Cerebral effects
-Teratogenic effects - Answer -Teratogenic effects
Teratogenic effects are effects of radiation on the embryo fetus in utero that depend on the fetal
stage of development and the radiation dose received.
If a radiograph was taken using a 40-inch source-to-image distance (SID) and the image was
repeated using an 80-inch SID, what change would be needed to maintain image receptor
exposure?
-Double the milliampere-seconds (mAs)
-Increase the milliampere-seconds (mAs) by four times
-Double the kilovoltage peak (kVp)
-Increase the kilovoltage peak (kVp) by four times - Answer -Increase the milliampere-
seconds (mAs) by four times
According to the inverse square law, when SID is doubled, the intensity of the x-ray beam will
decrease by a factor of 4. This is why mAs has to be increased by a factor of 4 as well.
Low-energy x-ray photons absorbed in the patient's skin will usually result in increased:
-Detector exposure
-Scatter production
-Patient exposure
