An image intensifiers photocathode causes ___ to be given off in direct proportion to the intensity of the
fluorescent light:
a. remnant radiation
b. electrons
c. x-rays
d. light photons - Correct Answer electrons
What fluoroscopic television system device decodes the video signal into a visible image?
a. Vidicon camera
b. Camera control unit
c. Television monitor
d. Electron gun - Correct Answer Television Monitor
Which of the following materials are used in the construction of a fluoroscopic tabletop?
1. Lead
2. Aluminum
3. Bakelite
4. Carbon fiber - Correct Answer 2, 3, and 4
Geometric factors in the shape of the image intensification tube
b. Focal-film-distance (FFD)
c. Object-to-image distance (OID)
d. Minification gain - Correct Answer ...
If the entrance skin dose is measured from the surface of the tabletop, the x-ray source is located:
a. either over or under the table
b. under the table
,c. over the table
d. not enough information provided - Correct Answer b. Under the table
The mottle level of an image can be adjusted by:
1. changing mA
2. changing kVp
3. changing the exposure factors
4. increasing the number of available x-ray photons - Correct Answer All of the above
During a fluoroscopic exam, the main source of scattered radiation is produced from:
a. the patient
b. x-ray source
c. table top
d. leakage radiation - Correct Answer the patient
Excessive lighting in the fluoroscopy room:
a. Helps to perceive a dim image as brighter
b. Helps to properly adjust the overall luminance of the TV image
c. Enhances visualization of a black and white TV image
d. May result in increasing the technical operating factors - Correct Answer May result in increasing the
technical operating factors
Suitable gonad shields must be used:
a. Whenever gonads are within the useful x-raybeam
b. When shielding of gonads does not interfere with the diagnosis
c. On all potentially procreative patients
d. At all times - Correct Answer When shielding of gonads does not interfere with the diagnosis
Which of the following are true concerning cine film?
,1. Available film sizes are: 70 mm, 100 mm, and 110 mm
2. The larger the film size the better the image quality
3. Nearly all cine-fluorography exams involve studies of the GI system
4. Delivers approximately the same dose as routine photospot image recording - Correct Answer 2 only
The exposure rate at the tabletop may not exceed five rads per minute except:
1. when using the ABC on large patients
2. during magnification mode
3. where higher exposure rates are allowed - Correct Answer b. 1, 2 and 3 only
Images produced with photo spot film cameras ___ spot films taken with conventional cassettes.
1. use a higher mA than
2. require about 1/2 to 1/3 the dose of
3. exhibit superior image quality compared to - Correct Answer require about 1/2 to 1/3 the dose
The ability of an imaging system to differentiate small objects that are closely spaced as separate objects
is referred to as:
a. Differentiation
b. Resolution
c. Statistical fluctuation
d. Detector contrast - Correct Answer b. Resolution
The photoconductive target in a television camera pick-up tube:
a. Conducts electrons across to the target
b. Allows a proportional electron charge to be generated at a particular position
c. Creates a video signal
d. Creates an electronic current which is converted into a video image
. - Correct Answer Allows a proportional electron charge to be generated at a particular position
, Size distortion is primarily caused by:
a. Focal-film-distance (FFD)
b. Geometric factors in the shape of the image intensification tube
c. Minification gain
d. Object-to-image distance (OID) - Correct Answer Object-to-image distance (OID)
The overall luminescence of the TV image may be properly adjusted by:
1. increasing room lighting
2. adjusting the contrast control button on the TV monitor
3. adjusting the brightness control button on the TV monitor - Correct Answer 2 and 3 only
Which of the following statements is true concerning fluoroscopic grids?
a. Reduces scattered radiation produced in the image intensifier
b. The typical grid ratio is 12:1
c. High ratio grids are preferred
d. Located between the patient and input layer of the image intensifier - Correct Answer Located
between the patient and input layer of the image intensifier
One of the most important actions a fluoroscopist can take to avoid unnecessary radiation exposure to
the patient is to use appropriate:
a. Illumination
b. Primary beam filtration
c. Collimation
d. Protective lead curtains - Correct Answer Collimation
The increase in effective brightness due to the size reduction of the output image size is referred to as:
a. Total gain
b. Minification gain
fluorescent light:
a. remnant radiation
b. electrons
c. x-rays
d. light photons - Correct Answer electrons
What fluoroscopic television system device decodes the video signal into a visible image?
a. Vidicon camera
b. Camera control unit
c. Television monitor
d. Electron gun - Correct Answer Television Monitor
Which of the following materials are used in the construction of a fluoroscopic tabletop?
1. Lead
2. Aluminum
3. Bakelite
4. Carbon fiber - Correct Answer 2, 3, and 4
Geometric factors in the shape of the image intensification tube
b. Focal-film-distance (FFD)
c. Object-to-image distance (OID)
d. Minification gain - Correct Answer ...
If the entrance skin dose is measured from the surface of the tabletop, the x-ray source is located:
a. either over or under the table
b. under the table
,c. over the table
d. not enough information provided - Correct Answer b. Under the table
The mottle level of an image can be adjusted by:
1. changing mA
2. changing kVp
3. changing the exposure factors
4. increasing the number of available x-ray photons - Correct Answer All of the above
During a fluoroscopic exam, the main source of scattered radiation is produced from:
a. the patient
b. x-ray source
c. table top
d. leakage radiation - Correct Answer the patient
Excessive lighting in the fluoroscopy room:
a. Helps to perceive a dim image as brighter
b. Helps to properly adjust the overall luminance of the TV image
c. Enhances visualization of a black and white TV image
d. May result in increasing the technical operating factors - Correct Answer May result in increasing the
technical operating factors
Suitable gonad shields must be used:
a. Whenever gonads are within the useful x-raybeam
b. When shielding of gonads does not interfere with the diagnosis
c. On all potentially procreative patients
d. At all times - Correct Answer When shielding of gonads does not interfere with the diagnosis
Which of the following are true concerning cine film?
,1. Available film sizes are: 70 mm, 100 mm, and 110 mm
2. The larger the film size the better the image quality
3. Nearly all cine-fluorography exams involve studies of the GI system
4. Delivers approximately the same dose as routine photospot image recording - Correct Answer 2 only
The exposure rate at the tabletop may not exceed five rads per minute except:
1. when using the ABC on large patients
2. during magnification mode
3. where higher exposure rates are allowed - Correct Answer b. 1, 2 and 3 only
Images produced with photo spot film cameras ___ spot films taken with conventional cassettes.
1. use a higher mA than
2. require about 1/2 to 1/3 the dose of
3. exhibit superior image quality compared to - Correct Answer require about 1/2 to 1/3 the dose
The ability of an imaging system to differentiate small objects that are closely spaced as separate objects
is referred to as:
a. Differentiation
b. Resolution
c. Statistical fluctuation
d. Detector contrast - Correct Answer b. Resolution
The photoconductive target in a television camera pick-up tube:
a. Conducts electrons across to the target
b. Allows a proportional electron charge to be generated at a particular position
c. Creates a video signal
d. Creates an electronic current which is converted into a video image
. - Correct Answer Allows a proportional electron charge to be generated at a particular position
, Size distortion is primarily caused by:
a. Focal-film-distance (FFD)
b. Geometric factors in the shape of the image intensification tube
c. Minification gain
d. Object-to-image distance (OID) - Correct Answer Object-to-image distance (OID)
The overall luminescence of the TV image may be properly adjusted by:
1. increasing room lighting
2. adjusting the contrast control button on the TV monitor
3. adjusting the brightness control button on the TV monitor - Correct Answer 2 and 3 only
Which of the following statements is true concerning fluoroscopic grids?
a. Reduces scattered radiation produced in the image intensifier
b. The typical grid ratio is 12:1
c. High ratio grids are preferred
d. Located between the patient and input layer of the image intensifier - Correct Answer Located
between the patient and input layer of the image intensifier
One of the most important actions a fluoroscopist can take to avoid unnecessary radiation exposure to
the patient is to use appropriate:
a. Illumination
b. Primary beam filtration
c. Collimation
d. Protective lead curtains - Correct Answer Collimation
The increase in effective brightness due to the size reduction of the output image size is referred to as:
a. Total gain
b. Minification gain
