Fluoroscopy Test - Image Production
Exam Questions with Complete
Answers
Atomic brightness control (ABC) maintains the brightness of the image by varying
______ - ANSWER-kVp and mA
The time it takes to turn on the digital fluoroscopy x-ray tube and reach the selected
mA and kVp is the ____ time - ANSWER-interrogation
Digital fluoroscopy with a charge-couples device has lower _____ and higher _____
than conventional fluoroscopy - ANSWER-patient dose, light sensitivity
A principal advantage of digital fluoroscopy is the _____ - ANSWER-image
subtraction
Digital fluoroscopic dose rate is lower than that for continuous analog fluoroscopy -
ANSWER-True
The source-to-skin distance limit for stationary fluoroscopic unit is _____ cm -
ANSWER-38
When performing a moblie fluoroscopic procedure, to reduce the radiation exposure
to the patient, the radiographer must use a minimal source-skin distance of _____
cm (_______ inches) - ANSWER-30; 12
How is brightness gain determined - ANSWER-product of minification and flux gain
Image contrast can be improved with ____ techniques - ANSWER-Subtraction
The image captured by FPIR is ________ compared to the ______ image of
traditional fluoroscopy - ANSWER-square, circular
The image intensifier's input phosphor differs from the output phosphor in what way -
ANSWER-is much larger
The time it takes to turn on the digital fluoroscopy x-ray tube and reach the selected
mA and kVp is the _____ time - ANSWER-interrogation
The total dose rate at the table top during fluoroscopy cannot exceed - ANSWER-10
R per minute
What device is required with a direct digital type of fluoroscopy system - ANSWER-
flat detector
, What happens when a multifocus image intensifier tube is operated in the
magnification mode - ANSWER-the electron focal point is closer to the input
phosphor
When using a 25/17/12 image intensifier tube, which of the following is true: -
ANSWER-the field of view is largest in the 25 cm mode
Which of the following describes the fluoroscopic system designed to maintain a
constant image brightness - ANSWER-automatic brightness control
Which of the following modes of a trifield image intensifier will result in the highest
patient dose - ANSWER-its 12 inch mode
If using a dynamic flat panel detector in fluoroscopy, the image intensifier is no
longer needed - ANSWER-True
The FPIR signal when used in DF is already digital - ANSWER-True
What is the minification gain for an image intensification tube with an input screen
diameter of 5 inches and an output diameter of 1 inch - ANSWER-25
What is the total brightness gain for an image intensification tube with a minification
gain of 25 and a fluc gain of 50 - ANSWER-1250
An image intensifier tube is identified by the diameter of its - ANSWER-input
phosphor
Brightness gain is typically in the range of _____. - ANSWER-5000-30000
During fluoroscopic image intensification, the primary x-ray beam exits the patient
and strikes the ____ of the image intensifier. - ANSWER-input screen
electrons hit the ___ after exiting the anode - ANSWER-output phosphor
Electrostatic lenses are actually _____ - ANSWER-charged electrodes
Electrostatic lenses are used to accelerate and focus - ANSWER-electrons
The image intensifier improved fluoroscopy by increasing image - ANSWER-
brightness
The input screen absorbs _____ and emits _____ - ANSWER-xray photons, light
photons
The kinetic energy of photoelectrons in the image intensifier is greatly increased by
the - ANSWER-potential difference across the tube
The number of light photons emitted within the image intensifier is ______ to the
amount of xray photons exiting the patient - ANSWER-directly proportional
Exam Questions with Complete
Answers
Atomic brightness control (ABC) maintains the brightness of the image by varying
______ - ANSWER-kVp and mA
The time it takes to turn on the digital fluoroscopy x-ray tube and reach the selected
mA and kVp is the ____ time - ANSWER-interrogation
Digital fluoroscopy with a charge-couples device has lower _____ and higher _____
than conventional fluoroscopy - ANSWER-patient dose, light sensitivity
A principal advantage of digital fluoroscopy is the _____ - ANSWER-image
subtraction
Digital fluoroscopic dose rate is lower than that for continuous analog fluoroscopy -
ANSWER-True
The source-to-skin distance limit for stationary fluoroscopic unit is _____ cm -
ANSWER-38
When performing a moblie fluoroscopic procedure, to reduce the radiation exposure
to the patient, the radiographer must use a minimal source-skin distance of _____
cm (_______ inches) - ANSWER-30; 12
How is brightness gain determined - ANSWER-product of minification and flux gain
Image contrast can be improved with ____ techniques - ANSWER-Subtraction
The image captured by FPIR is ________ compared to the ______ image of
traditional fluoroscopy - ANSWER-square, circular
The image intensifier's input phosphor differs from the output phosphor in what way -
ANSWER-is much larger
The time it takes to turn on the digital fluoroscopy x-ray tube and reach the selected
mA and kVp is the _____ time - ANSWER-interrogation
The total dose rate at the table top during fluoroscopy cannot exceed - ANSWER-10
R per minute
What device is required with a direct digital type of fluoroscopy system - ANSWER-
flat detector
, What happens when a multifocus image intensifier tube is operated in the
magnification mode - ANSWER-the electron focal point is closer to the input
phosphor
When using a 25/17/12 image intensifier tube, which of the following is true: -
ANSWER-the field of view is largest in the 25 cm mode
Which of the following describes the fluoroscopic system designed to maintain a
constant image brightness - ANSWER-automatic brightness control
Which of the following modes of a trifield image intensifier will result in the highest
patient dose - ANSWER-its 12 inch mode
If using a dynamic flat panel detector in fluoroscopy, the image intensifier is no
longer needed - ANSWER-True
The FPIR signal when used in DF is already digital - ANSWER-True
What is the minification gain for an image intensification tube with an input screen
diameter of 5 inches and an output diameter of 1 inch - ANSWER-25
What is the total brightness gain for an image intensification tube with a minification
gain of 25 and a fluc gain of 50 - ANSWER-1250
An image intensifier tube is identified by the diameter of its - ANSWER-input
phosphor
Brightness gain is typically in the range of _____. - ANSWER-5000-30000
During fluoroscopic image intensification, the primary x-ray beam exits the patient
and strikes the ____ of the image intensifier. - ANSWER-input screen
electrons hit the ___ after exiting the anode - ANSWER-output phosphor
Electrostatic lenses are actually _____ - ANSWER-charged electrodes
Electrostatic lenses are used to accelerate and focus - ANSWER-electrons
The image intensifier improved fluoroscopy by increasing image - ANSWER-
brightness
The input screen absorbs _____ and emits _____ - ANSWER-xray photons, light
photons
The kinetic energy of photoelectrons in the image intensifier is greatly increased by
the - ANSWER-potential difference across the tube
The number of light photons emitted within the image intensifier is ______ to the
amount of xray photons exiting the patient - ANSWER-directly proportional
