Fluoroscopy exam (AAPA CME course) Questions With
Complete Solutions
By decreasing the OID (object-to-image distance) by 13cm
(5in), ESE will decrease by ___%
more than 50%
Pulsed fluoroscopy mode should be used to reduce ___
ESE
Alarm sounds at ____
5-minute and 10-minute exposure time
Operator can reduce the exposure rate by ____ kVp
increasing (by penetrating harder and less scattering)
Operator can reduce the exposure rate by ____ mA
lowering (by reducing scattering radiation)
Scatter exposure rate on the image receptor side is about ____
times less than x-ray source side
5
Dose-area product is
the product of the entrance skin dose and cross-sectional area of
the x-ray beam
What are typical ESE rate during low and high fluoro?
Low-dose fluoro: 1-5R.min, High-dose fluoro: 10-20R/min
, Conversion from rem to Sv (sievert, SI unit)
1 rem = 0.01 Sv
effective dose limit for occupational exposure
5 rem (0.05Sv) / year, or a cummulative limit of 1 rem x the
individual's age. The limit for the lens is 15 rem/yr. The skin,
hands and feet is 50rem/yr
When an image intensification system is used, the lead
equivalent of the primary protective barrier must be _______
mm
2
What fluoroscopic technique allows the practitioner to obtain a
permanent image of anything viewed during a live fluoroscopy
sequence?
Frame grabbing
If using high-dose fluoroscopy mode with an ESE rate of 20
R/min, how much exposure time is necessary to cause early
transient erythema?
10.2 min
What are the advantages of CCDs over a video tube camera
system for mobile fluoroscopy?
CCDs eliminate lag
CCDs are more sensitive than video tubes
CCDs have lower operating voltages
As the field of view decreases, the ESE rate:
Complete Solutions
By decreasing the OID (object-to-image distance) by 13cm
(5in), ESE will decrease by ___%
more than 50%
Pulsed fluoroscopy mode should be used to reduce ___
ESE
Alarm sounds at ____
5-minute and 10-minute exposure time
Operator can reduce the exposure rate by ____ kVp
increasing (by penetrating harder and less scattering)
Operator can reduce the exposure rate by ____ mA
lowering (by reducing scattering radiation)
Scatter exposure rate on the image receptor side is about ____
times less than x-ray source side
5
Dose-area product is
the product of the entrance skin dose and cross-sectional area of
the x-ray beam
What are typical ESE rate during low and high fluoro?
Low-dose fluoro: 1-5R.min, High-dose fluoro: 10-20R/min
, Conversion from rem to Sv (sievert, SI unit)
1 rem = 0.01 Sv
effective dose limit for occupational exposure
5 rem (0.05Sv) / year, or a cummulative limit of 1 rem x the
individual's age. The limit for the lens is 15 rem/yr. The skin,
hands and feet is 50rem/yr
When an image intensification system is used, the lead
equivalent of the primary protective barrier must be _______
mm
2
What fluoroscopic technique allows the practitioner to obtain a
permanent image of anything viewed during a live fluoroscopy
sequence?
Frame grabbing
If using high-dose fluoroscopy mode with an ESE rate of 20
R/min, how much exposure time is necessary to cause early
transient erythema?
10.2 min
What are the advantages of CCDs over a video tube camera
system for mobile fluoroscopy?
CCDs eliminate lag
CCDs are more sensitive than video tubes
CCDs have lower operating voltages
As the field of view decreases, the ESE rate:
