Xray Physics exam 2| 180 questions| with
complete solutions
X-ray interaction with matter produces the whites in the image: CORRECT ANSWERS:
Photoelectric absorption
X-ray interaction causing "fog" in an image: CORRECT ANSWERS: Compton scatter
X-ray interaction occurs at high kVp in the diagnostic range: CORRECT ANSWERS: Compton
scatter
X-ray interaction decreased image contrast: CORRECT ANSWERS: Compton scatter
Radiation bouncing erratically off patient: CORRECT ANSWERS: Scatter
Radiation hitting image receptor: CORRECT ANSWERS: Remnant
Reduced fog, increased contrast is the goal for: CORRECT ANSWERS: Scatter control
Most effective scatter control device: CORRECT ANSWERS: Grids
Optimum range of kVp for spine imaging: CORRECT ANSWERS: 70-90 kVp
Optimum range of kVp for extremity imaging: CORRECT ANSWERS: 50-60 kVp
Scattered radiation is directly proportional to part thickness.
True/False CORRECT ANSWERS: True
Compressive techniques effect on mAs: CORRECT ANSWERS: Decreased mAs
Exhibits less lumbar shape distortion: CORRECT ANSWERS: PA lumbar spine
Exhibits less lumbar size distortion: CORRECT ANSWERS: AP lumbar spine
3 types of beam-restricting devices: CORRECT ANSWERS: Aperture diaphragm,
cones/cylinders, variable aperture collimator
Best x-ray restrictor: CORRECT ANSWERS: Collimator
Defines size and shape of x-ray field: CORRECT ANSWERS: Collimator
2 sets of shutters on collimator: CORRECT ANSWERS: Longitudinal and transverse
X-ray field area and collimated area relationship: CORRECT ANSWERS: Inverse
, Decreases amount of tissue for interaction which decreases compton scatter: CORRECT
ANSWERS: Decreased x-ray field area/ increased collimated area
Decreases amount of tissue for interaction, which also causes decreased overall density to film:
CORRECT ANSWERS: Decreased x-ray field area
When collimating significantly smaller area mAs: CORRECT ANSWERS: Increased 50-100%
(2x)
When collimating from 14x17 area to 10x12 area: CORRECT ANSWERS: Increase mAs 50%
AP lumbar spine using 40 mAs, 73 kVp on 14x17 film. 4x4 spot view required, new exposure
factors: CORRECT ANSWERS: 80 mAs, 73 kVp
AIR GAP: CORRECT ANSWERS: Increased OID
Decreases scatter but increases magnifcation: CORRECT ANSWERS: AIR GAP (increased
OID)
Affected with increased OID: CORRECT ANSWERS: Increased mAs at 10% per cm of air gap
6 cm air gap: CORRECT ANSWERS: Increase mAs 50%
10-15 cm air gap: CORRECT ANSWERS: Increase mAs 100% (2x)
An image with no OID requires 20 mAs, when there's a 6" OID mAs: CORRECT ANSWERS:
30 mAs
2 of the most important elements used to create superior image: CORRECT ANSWERS:
Contrast and image detail
X-ray interaction with matter producing whites in the image: CORRECT ANSWERS:
Photoelectric absorption
X-ray beam energy below 60 kVp: CORRECT ANSWERS: Photoelectric
Higher kVP: CORRECT ANSWERS: Compton scatter increased
10 cm or greater thickness: CORRECT ANSWERS: More compton scatter
Wider or longer area/field of exposure: CORRECT ANSWERS: More area for interaction
X-ray interaction occurring at high kVp in diagnostic range: CORRECT ANSWERS: Compton
scatter
complete solutions
X-ray interaction with matter produces the whites in the image: CORRECT ANSWERS:
Photoelectric absorption
X-ray interaction causing "fog" in an image: CORRECT ANSWERS: Compton scatter
X-ray interaction occurs at high kVp in the diagnostic range: CORRECT ANSWERS: Compton
scatter
X-ray interaction decreased image contrast: CORRECT ANSWERS: Compton scatter
Radiation bouncing erratically off patient: CORRECT ANSWERS: Scatter
Radiation hitting image receptor: CORRECT ANSWERS: Remnant
Reduced fog, increased contrast is the goal for: CORRECT ANSWERS: Scatter control
Most effective scatter control device: CORRECT ANSWERS: Grids
Optimum range of kVp for spine imaging: CORRECT ANSWERS: 70-90 kVp
Optimum range of kVp for extremity imaging: CORRECT ANSWERS: 50-60 kVp
Scattered radiation is directly proportional to part thickness.
True/False CORRECT ANSWERS: True
Compressive techniques effect on mAs: CORRECT ANSWERS: Decreased mAs
Exhibits less lumbar shape distortion: CORRECT ANSWERS: PA lumbar spine
Exhibits less lumbar size distortion: CORRECT ANSWERS: AP lumbar spine
3 types of beam-restricting devices: CORRECT ANSWERS: Aperture diaphragm,
cones/cylinders, variable aperture collimator
Best x-ray restrictor: CORRECT ANSWERS: Collimator
Defines size and shape of x-ray field: CORRECT ANSWERS: Collimator
2 sets of shutters on collimator: CORRECT ANSWERS: Longitudinal and transverse
X-ray field area and collimated area relationship: CORRECT ANSWERS: Inverse
, Decreases amount of tissue for interaction which decreases compton scatter: CORRECT
ANSWERS: Decreased x-ray field area/ increased collimated area
Decreases amount of tissue for interaction, which also causes decreased overall density to film:
CORRECT ANSWERS: Decreased x-ray field area
When collimating significantly smaller area mAs: CORRECT ANSWERS: Increased 50-100%
(2x)
When collimating from 14x17 area to 10x12 area: CORRECT ANSWERS: Increase mAs 50%
AP lumbar spine using 40 mAs, 73 kVp on 14x17 film. 4x4 spot view required, new exposure
factors: CORRECT ANSWERS: 80 mAs, 73 kVp
AIR GAP: CORRECT ANSWERS: Increased OID
Decreases scatter but increases magnifcation: CORRECT ANSWERS: AIR GAP (increased
OID)
Affected with increased OID: CORRECT ANSWERS: Increased mAs at 10% per cm of air gap
6 cm air gap: CORRECT ANSWERS: Increase mAs 50%
10-15 cm air gap: CORRECT ANSWERS: Increase mAs 100% (2x)
An image with no OID requires 20 mAs, when there's a 6" OID mAs: CORRECT ANSWERS:
30 mAs
2 of the most important elements used to create superior image: CORRECT ANSWERS:
Contrast and image detail
X-ray interaction with matter producing whites in the image: CORRECT ANSWERS:
Photoelectric absorption
X-ray beam energy below 60 kVp: CORRECT ANSWERS: Photoelectric
Higher kVP: CORRECT ANSWERS: Compton scatter increased
10 cm or greater thickness: CORRECT ANSWERS: More compton scatter
Wider or longer area/field of exposure: CORRECT ANSWERS: More area for interaction
X-ray interaction occurring at high kVp in diagnostic range: CORRECT ANSWERS: Compton
scatter
