Final Radiographic Imaging and
Physics Exam-Graded A
In modern imaging systems, the components for rectification are _____. - ANSWER-
solid state semiconductors
What is the industry standard formula for calculating high voltage generator power? -
ANSWER-Power = max mA (@100 kVp and 100 ms) ´ 100 kVp
K-shell binding energy increases with increasing _____. - ANSWER-atomic number
If 5% of an incident beam is transmitted through a body part, then 95% of that beam
was _____. - ANSWER-Attenuated
If there were such thing as a perfect imaging system, the MTF would be equal to _____.
- ANSWER-1
The first component to receive power in the x-ray circuit is the _____. - ANSWER-Auto
transformer
Registering an image to correct for patient motion is done with _____. - ANSWER-Pixa
shift
Of all Radiographic imaging systems, _____ has the best contrast resolution. -
ANSWER-mammography
What is the spatial frequency of a digital system that can resolve 100 um - ANSWER-10
lp/mm
Luminescent material emits light after its outer shell electrons are _____. - ANSWER-
excited
The photon interaction in the emulsion occur with exposure to _____. - ANSWER-Xrays
Light
A 15% increase in KVP is equivalent to - ANSWER-doubling the mAs
The useful characteristic x-rays from tungsten targets are ___-shell x-rays. - ANSWER-
K
, The effective focal spot size is ________ the actual focal spot size - ANSWER-smaller
than
Most of the x-rays produced at the target are _____. - ANSWER-Bremsstrahlung
The intensification factor is the exposure required _____ divided by the exposure
required _____. - ANSWER-Without screens, with screens
A low quality beam would also have low _____. - ANSWER-penetrability
During fluoroscopy the exposure to the collar is _____ times greater than exposure to
the trunk of the body under a protective apron. - ANSWER-20
A _____ is an example of an exposure artifact - ANSWER-foreign object
Backscatter radiation artifacts can occur more readily in digital imaging because of the
_____. - ANSWER-highly sensitive receptors
Contrast resolution is improved by - ANSWER-tight collimation, lowering kVp, patient
compression
Federal regulations passed in _____ required that positive beam limiting devices be on
all manufactured x-ray collimators. - ANSWER-1974
The radiation dose monitor most frequently used to measure patient exposure is the
_____. - ANSWER-Thermoluminescent dosimeter
The x-ray interaction that contributes to the clear parts of the image is _____. -
ANSWER-Photoelectric interaction
The _____ is the primary protective barrier for the fluoroscopic X-ray tube - ANSWER-
image intensifier
Object artifacts and digital imaging can occur from errors in:
I. X-ray bean collimation
II. Histogram selection
III. Patient positioning - ANSWER-All the above
Radiation induced genetic damage follows a _____ dose response relationship. -
ANSWER-linear, nonthreshold
If the half value layer (HVL) in a radiology department is 0.25 mm PB, then how thick
should I should be to reduce the technologists exposure to 1/4 of the incident scatter. -
ANSWER-0.5 mm Pb
Physics Exam-Graded A
In modern imaging systems, the components for rectification are _____. - ANSWER-
solid state semiconductors
What is the industry standard formula for calculating high voltage generator power? -
ANSWER-Power = max mA (@100 kVp and 100 ms) ´ 100 kVp
K-shell binding energy increases with increasing _____. - ANSWER-atomic number
If 5% of an incident beam is transmitted through a body part, then 95% of that beam
was _____. - ANSWER-Attenuated
If there were such thing as a perfect imaging system, the MTF would be equal to _____.
- ANSWER-1
The first component to receive power in the x-ray circuit is the _____. - ANSWER-Auto
transformer
Registering an image to correct for patient motion is done with _____. - ANSWER-Pixa
shift
Of all Radiographic imaging systems, _____ has the best contrast resolution. -
ANSWER-mammography
What is the spatial frequency of a digital system that can resolve 100 um - ANSWER-10
lp/mm
Luminescent material emits light after its outer shell electrons are _____. - ANSWER-
excited
The photon interaction in the emulsion occur with exposure to _____. - ANSWER-Xrays
Light
A 15% increase in KVP is equivalent to - ANSWER-doubling the mAs
The useful characteristic x-rays from tungsten targets are ___-shell x-rays. - ANSWER-
K
, The effective focal spot size is ________ the actual focal spot size - ANSWER-smaller
than
Most of the x-rays produced at the target are _____. - ANSWER-Bremsstrahlung
The intensification factor is the exposure required _____ divided by the exposure
required _____. - ANSWER-Without screens, with screens
A low quality beam would also have low _____. - ANSWER-penetrability
During fluoroscopy the exposure to the collar is _____ times greater than exposure to
the trunk of the body under a protective apron. - ANSWER-20
A _____ is an example of an exposure artifact - ANSWER-foreign object
Backscatter radiation artifacts can occur more readily in digital imaging because of the
_____. - ANSWER-highly sensitive receptors
Contrast resolution is improved by - ANSWER-tight collimation, lowering kVp, patient
compression
Federal regulations passed in _____ required that positive beam limiting devices be on
all manufactured x-ray collimators. - ANSWER-1974
The radiation dose monitor most frequently used to measure patient exposure is the
_____. - ANSWER-Thermoluminescent dosimeter
The x-ray interaction that contributes to the clear parts of the image is _____. -
ANSWER-Photoelectric interaction
The _____ is the primary protective barrier for the fluoroscopic X-ray tube - ANSWER-
image intensifier
Object artifacts and digital imaging can occur from errors in:
I. X-ray bean collimation
II. Histogram selection
III. Patient positioning - ANSWER-All the above
Radiation induced genetic damage follows a _____ dose response relationship. -
ANSWER-linear, nonthreshold
If the half value layer (HVL) in a radiology department is 0.25 mm PB, then how thick
should I should be to reduce the technologists exposure to 1/4 of the incident scatter. -
ANSWER-0.5 mm Pb
