ARRT - Fluoroscopy permit UPDATED
ACTUAL Questions and CORRECT
Answers
C) real time viewing - CORRECT ANSWER - The principal purpose of image intensified
fluoro compared to conventional radiography is that it allows for
A) higher resolution
B)lower patient dose
C) real time viewing
D) all of the above
Adaptation Time - CORRECT ANSWER - The time it takes for the human eye to adjust to
the low light levels of conventional fluro is called
25 kV (pg. 17 - the potential maintained by the accelerating anode in the image intensifier) -
CORRECT ANSWER - The operating potential of most modern image intensifier tubes is
approximately:
Minification ratio - CORRECT ANSWER - The squared ratio of the input to output screen
diameter in an image intensifier tube is termed:
2.25 (9^2)/(6^2) - CORRECT ANSWER - When changing from a 9" input phosphor to a
6", you must increase your exposure factor by ___ times.
A. 1-5 mA - CORRECT ANSWER - The normal mA used for image intensified fluoro is
about:
A. 1-5 mA
B. 6-10 mA
C. 25-100 mA
D. 100-600 mA
,D) conversion factor
- conversion factor is used in the periodic check of brightness gain, since BG can deteriorate as
much as 10% yearly due to the "aging" of the input and output screen phosphors. It's calculated
as the [intensity of output phosphor] / input exposure rate - CORRECT ANSWER -A
standardized method of evaluating the light emission of an image intensifier is called:
A) brightness gain
B) relative aperture
C) signal to noise ratio
D) conversion factor
D) all of the above - CORRECT ANSWER - The brightness gain (image brightness) of an
image intensifier can be increased by increasing the:
A) exposure rate to the input screen
B) minification ratio
C) acceleration potential of the tube (kVp)
D) all of the above
A) improved image quality
- there is MORE minification gain, and HIGHER patient dose with automatic brightness control
to compensate for the decreased brightness - CORRECT ANSWER - The principle
advantage of the smaller field of the dual field image intensifier is:
A) improved image quality
B) less minification gain
C) lower patient dose
D) all of the above
A) phototopic (cone) vision - CORRECT ANSWER - The part of the eyes that detect small
object details are:
A) phototopic (cone) vision
, B) scotopic (rod) vision
D) decrease pt skin dose - CORRECT ANSWER - During an image intensified fluoro
study (manual mode), an increase in kilovoltage will
A) lower penetration
B) increase pt's dose
C)improve image contrast
D) decrease pt skin dose
C)electronic intensification
- conversion gain isn't a thing (conversion factor is), minification gain is the intensification from
the same amount of electrons from the large input screen being squeezed onto the smaller output
screen. - CORRECT ANSWER - The increase in light production by an image intensifier
resulting from the acceleration of the electrons across the tube is called:
A)conversion gain
B)minification gain
C)electronic intensification
D)Lambert gain
A) 5-20 times - CORRECT ANSWER - The brightness of an image intensified fluoro
image is about ____ greater than a conventional fluoro screen image:
A) 5-20 times
B) 20-40 times
C)50-200 times
D) 5,000-20,000 times
C) 450 mR
- Output, or brightness, varies directly with the change in mA and roughly the square of the kVp.
- CORRECT ANSWER - If a fluoro tube output is 300 mR at 2 mA, what would the
output be at 3 mA?
ACTUAL Questions and CORRECT
Answers
C) real time viewing - CORRECT ANSWER - The principal purpose of image intensified
fluoro compared to conventional radiography is that it allows for
A) higher resolution
B)lower patient dose
C) real time viewing
D) all of the above
Adaptation Time - CORRECT ANSWER - The time it takes for the human eye to adjust to
the low light levels of conventional fluro is called
25 kV (pg. 17 - the potential maintained by the accelerating anode in the image intensifier) -
CORRECT ANSWER - The operating potential of most modern image intensifier tubes is
approximately:
Minification ratio - CORRECT ANSWER - The squared ratio of the input to output screen
diameter in an image intensifier tube is termed:
2.25 (9^2)/(6^2) - CORRECT ANSWER - When changing from a 9" input phosphor to a
6", you must increase your exposure factor by ___ times.
A. 1-5 mA - CORRECT ANSWER - The normal mA used for image intensified fluoro is
about:
A. 1-5 mA
B. 6-10 mA
C. 25-100 mA
D. 100-600 mA
,D) conversion factor
- conversion factor is used in the periodic check of brightness gain, since BG can deteriorate as
much as 10% yearly due to the "aging" of the input and output screen phosphors. It's calculated
as the [intensity of output phosphor] / input exposure rate - CORRECT ANSWER -A
standardized method of evaluating the light emission of an image intensifier is called:
A) brightness gain
B) relative aperture
C) signal to noise ratio
D) conversion factor
D) all of the above - CORRECT ANSWER - The brightness gain (image brightness) of an
image intensifier can be increased by increasing the:
A) exposure rate to the input screen
B) minification ratio
C) acceleration potential of the tube (kVp)
D) all of the above
A) improved image quality
- there is MORE minification gain, and HIGHER patient dose with automatic brightness control
to compensate for the decreased brightness - CORRECT ANSWER - The principle
advantage of the smaller field of the dual field image intensifier is:
A) improved image quality
B) less minification gain
C) lower patient dose
D) all of the above
A) phototopic (cone) vision - CORRECT ANSWER - The part of the eyes that detect small
object details are:
A) phototopic (cone) vision
, B) scotopic (rod) vision
D) decrease pt skin dose - CORRECT ANSWER - During an image intensified fluoro
study (manual mode), an increase in kilovoltage will
A) lower penetration
B) increase pt's dose
C)improve image contrast
D) decrease pt skin dose
C)electronic intensification
- conversion gain isn't a thing (conversion factor is), minification gain is the intensification from
the same amount of electrons from the large input screen being squeezed onto the smaller output
screen. - CORRECT ANSWER - The increase in light production by an image intensifier
resulting from the acceleration of the electrons across the tube is called:
A)conversion gain
B)minification gain
C)electronic intensification
D)Lambert gain
A) 5-20 times - CORRECT ANSWER - The brightness of an image intensified fluoro
image is about ____ greater than a conventional fluoro screen image:
A) 5-20 times
B) 20-40 times
C)50-200 times
D) 5,000-20,000 times
C) 450 mR
- Output, or brightness, varies directly with the change in mA and roughly the square of the kVp.
- CORRECT ANSWER - If a fluoro tube output is 300 mR at 2 mA, what would the
output be at 3 mA?
