Physics RAD 1365 questions & answers
Preprocessing the digital image is done _____, and post-processing is
done _____. -answer Automatically;Manually
The decreasing luminous intensity with increasing distance from the
source of light follows_____. -answer The inverse square law
Post-processing includes all of the following except____. -answer Signal
Interpolation
The Nyquist Frequency is -answer sampling a minimum of twice per
cycle
As the image intensifiers FOV is reduced,
1. Magnification increases
2. Brightness decreases
3. Quality increases -answer 1,2, and 3
Because the output phosphor is smaller than the input phosphor, there
is an increase in brightness called: -answer Minification Gain
T/F: Brightness gain deteriorates with use. -answer True
,A charge-coupled device used in digital fluoroscopy provides high_____.
-answer Spatial Resolution, Signal-to-Noise Ratio, and Detective
Quantum Efficiency
During fluoroscopic procedures, the automatic brightness control (ABC)
functions to: -answer Compensate for changes in patient part thickness
Fluoroscopic resolution will vary according to
A. minification gain
B. electrostatic focal point
C. input and output screen diameter
D. all of the above -answer all of the above
A device in which the x-ray tube and image intensifier are located on
opposite cusps of a semicircular arch is called: -answer C-arm
For the device in the attached image, the light source exposing the
image receptor come from a material made of: -answer Cesium Iodide
In which part of the image intensifier is the electronic image created? -
answer At the photocathode
,Patient dose during fluoroscopy is affected by the
1. distance between the patient and the input phosphor.
2. amount of magnification.
3. tissue density. -answer 1,2, and 3
The crystal utilized in fluoroscopic screens is: -answer Cesium Iodide
The image intensifier's input phosphor differs from the output
phosphor in that the input phosphor: -answer Is much larger than the
output phosphor
The image-intensifier tube's input phosphor functions to convert: -
answer X-rays to light
The image on the output phosphor of the intensifier tube is:
1. brighter than the input phosphor
2. dimmer than the input phosphor
3. larger than the input phosphor -answer 1 only
The input screen absorbs ____ and emits ____. -answer x-ray photons,
light photons
, The input screen is ____ in shape. -answer concave
The output screen absorbs ______ and emits_____ -answer Electrons;
light photons
T/F: A lens focuses the light produced by the scintillator onto a CCD -
answer True
T/F: Digital Fluoroscopy is achieved through the use of an image
intensifier -answer False
For the attached device, the scintillator is exposed directly by x-rays, the
scintillators can be made of: -answer Cesium Iodide and Gadolinim
Oxysulfide
The edge distortion problem in image intensification tunes is called -
answer Vignetting
The photocathode of an image intensification system is located: -
answer On the input side
The shape of the input screen helps to control -answer Distortion
Preprocessing the digital image is done _____, and post-processing is
done _____. -answer Automatically;Manually
The decreasing luminous intensity with increasing distance from the
source of light follows_____. -answer The inverse square law
Post-processing includes all of the following except____. -answer Signal
Interpolation
The Nyquist Frequency is -answer sampling a minimum of twice per
cycle
As the image intensifiers FOV is reduced,
1. Magnification increases
2. Brightness decreases
3. Quality increases -answer 1,2, and 3
Because the output phosphor is smaller than the input phosphor, there
is an increase in brightness called: -answer Minification Gain
T/F: Brightness gain deteriorates with use. -answer True
,A charge-coupled device used in digital fluoroscopy provides high_____.
-answer Spatial Resolution, Signal-to-Noise Ratio, and Detective
Quantum Efficiency
During fluoroscopic procedures, the automatic brightness control (ABC)
functions to: -answer Compensate for changes in patient part thickness
Fluoroscopic resolution will vary according to
A. minification gain
B. electrostatic focal point
C. input and output screen diameter
D. all of the above -answer all of the above
A device in which the x-ray tube and image intensifier are located on
opposite cusps of a semicircular arch is called: -answer C-arm
For the device in the attached image, the light source exposing the
image receptor come from a material made of: -answer Cesium Iodide
In which part of the image intensifier is the electronic image created? -
answer At the photocathode
,Patient dose during fluoroscopy is affected by the
1. distance between the patient and the input phosphor.
2. amount of magnification.
3. tissue density. -answer 1,2, and 3
The crystal utilized in fluoroscopic screens is: -answer Cesium Iodide
The image intensifier's input phosphor differs from the output
phosphor in that the input phosphor: -answer Is much larger than the
output phosphor
The image-intensifier tube's input phosphor functions to convert: -
answer X-rays to light
The image on the output phosphor of the intensifier tube is:
1. brighter than the input phosphor
2. dimmer than the input phosphor
3. larger than the input phosphor -answer 1 only
The input screen absorbs ____ and emits ____. -answer x-ray photons,
light photons
, The input screen is ____ in shape. -answer concave
The output screen absorbs ______ and emits_____ -answer Electrons;
light photons
T/F: A lens focuses the light produced by the scintillator onto a CCD -
answer True
T/F: Digital Fluoroscopy is achieved through the use of an image
intensifier -answer False
For the attached device, the scintillator is exposed directly by x-rays, the
scintillators can be made of: -answer Cesium Iodide and Gadolinim
Oxysulfide
The edge distortion problem in image intensification tunes is called -
answer Vignetting
The photocathode of an image intensification system is located: -
answer On the input side
The shape of the input screen helps to control -answer Distortion
