RAD117 Test 3 Questions And Correct Answers
What can help reduce the likelihood of repeat images owing to motion or other
patient-related errors? - ANSWER Effective communication, proper application,
shortest exposure time
What exposure factors would produce the highest patient dose, all other variables
unchanged? - ANSWER Low kVp, high mAs, decreased filtration
Filtration in the x-ray tube is intended to reduce radiation dose to the skin caused by... -
ANSWER Long wavelength x-ray photons
A way to determine the effectiveness of the filtration in the x-ray tube is to perform a... -
ANSWER Half value layer test
An x-ray beam that has gone through an aluminum filter will exhibit... - ANSWER
Increased average energy, decreased intensity
What contributes to lower patient dose? - ANSWER Collimation to the area of interest
Positive beam limitation (PBL) is designed to... - ANSWER Produce an x-ray field that is
no larger than the film used
Inherent filtration consists of... - ANSWER X-ray tube window, insulating oil
What are beam-restriction devices? - ANSWER Extension cylinders + cones,
collimators
Off-focus radiation can be best described as radiation... - ANSWER Created within the
, x-ray tube at points other than the focal track
Components of inherent filtration - ANSWER Insulating oil within the x-ray tube
housing, window of the x-ray tube
Total filtration required for x-ray tubes operating at 70 kVp is... - ANSWER 2.5 mm Al
equivalent
Leakage radiation is radiation that... - ANSWER Emerges from the x-ray tube housing
Gonadal shielding - ANSWER Flat cone shields, shadow shields, shaped shields
Gonadal shielding is generally required on patients of reproductive age and younger
when collimated field falls within... - ANSWER 5 cm of reproductive organs
Which exposure factor will deliver the lowest gonadal dose for a pelvic radiograph? -
ANSWER 90 kVp, 12 mAs
What will result in decreased patient dose, all other factors adjusted to maintain desired
image quality? - ANSWER Use of collimation
What relative screen speed will result in the lowest possible patient dose, assuming
adjustments are made to produce acceptable radiographic results? - ANSWER 800
Which grid would result in the highest patient dose? - ANSWER 12:1
Minimum source-to-skin distance permitted with portable x-ray equipment? - ANSWER
12 inches (30 cm)
Minimum source-to-tabletop distance permitted for stationary fluoroscopic unit is... -
What can help reduce the likelihood of repeat images owing to motion or other
patient-related errors? - ANSWER Effective communication, proper application,
shortest exposure time
What exposure factors would produce the highest patient dose, all other variables
unchanged? - ANSWER Low kVp, high mAs, decreased filtration
Filtration in the x-ray tube is intended to reduce radiation dose to the skin caused by... -
ANSWER Long wavelength x-ray photons
A way to determine the effectiveness of the filtration in the x-ray tube is to perform a... -
ANSWER Half value layer test
An x-ray beam that has gone through an aluminum filter will exhibit... - ANSWER
Increased average energy, decreased intensity
What contributes to lower patient dose? - ANSWER Collimation to the area of interest
Positive beam limitation (PBL) is designed to... - ANSWER Produce an x-ray field that is
no larger than the film used
Inherent filtration consists of... - ANSWER X-ray tube window, insulating oil
What are beam-restriction devices? - ANSWER Extension cylinders + cones,
collimators
Off-focus radiation can be best described as radiation... - ANSWER Created within the
, x-ray tube at points other than the focal track
Components of inherent filtration - ANSWER Insulating oil within the x-ray tube
housing, window of the x-ray tube
Total filtration required for x-ray tubes operating at 70 kVp is... - ANSWER 2.5 mm Al
equivalent
Leakage radiation is radiation that... - ANSWER Emerges from the x-ray tube housing
Gonadal shielding - ANSWER Flat cone shields, shadow shields, shaped shields
Gonadal shielding is generally required on patients of reproductive age and younger
when collimated field falls within... - ANSWER 5 cm of reproductive organs
Which exposure factor will deliver the lowest gonadal dose for a pelvic radiograph? -
ANSWER 90 kVp, 12 mAs
What will result in decreased patient dose, all other factors adjusted to maintain desired
image quality? - ANSWER Use of collimation
What relative screen speed will result in the lowest possible patient dose, assuming
adjustments are made to produce acceptable radiographic results? - ANSWER 800
Which grid would result in the highest patient dose? - ANSWER 12:1
Minimum source-to-skin distance permitted with portable x-ray equipment? - ANSWER
12 inches (30 cm)
Minimum source-to-tabletop distance permitted for stationary fluoroscopic unit is... -
