California Fluoroscopy Test |586
Questions and Answers A+ Rated
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 - -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 - -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 - -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 - -...
- 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 - -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 - -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 - -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 - -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 - -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 - -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 - -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 - -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 - -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
. - -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) - -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 - -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 - -
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 - -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
c. Output gain
d. Electronic gain - -b. Minification gain
- In a TV camera, the proportional electron charge is converted into a
proportional voltage which is sent to the:
a. Camera control unit
b. Electron gun
, c. TV monitor
d. Output phosphor - -Camera control unit
- The greatest limiting factor concerning resolution for fluoroscopic systems
is the:
a. Output phosphor
b. Video monitor
c. Input phosphor
d. TV camera - -Video monitor
- Since the Bucky tray cover is directly in line with the fluoroscopists gonads,
the opening must be automatically covered with ___ equivalent material.
a. 2.5 mm aluminum
b. 2.5 mm lead
c. 0.25 mm aluminum
d. 0.25 mm lead - -0.25 mm lead
- What percentage of incident photons will emerge unaffected by the
patients tissues?
a. 50%
b. 10%
c. 1%
d. 5%
. - -5%
- The primary purpose of protective drapes or sliding panels is to:
1. Reduce scatter to the patient
2. Reduce scatter to the operator
3. Reduce scatter to the image intensifier
4. Reduce radiation coming primarily from the patient - -2 and 4
- The components of the closed-circuit television system are:
1. vidicon camera
2. imaging intensifier
3. camera control unit
4. television monitor - -1, 3 and 4 only
- For fluoroscopic installations, the primary barrier is considered to be the:
1. Floor
2. Ceiling
3. Walls
4. Image intensifier assembly - -4 only
- The component in an image intensifier that regulates or changes the
amount of magnification in the virtual image is the:
Questions and Answers A+ Rated
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 - -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 - -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 - -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 - -...
- 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 - -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 - -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 - -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 - -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 - -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 - -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 - -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 - -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 - -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
. - -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) - -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 - -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 - -
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 - -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
c. Output gain
d. Electronic gain - -b. Minification gain
- In a TV camera, the proportional electron charge is converted into a
proportional voltage which is sent to the:
a. Camera control unit
b. Electron gun
, c. TV monitor
d. Output phosphor - -Camera control unit
- The greatest limiting factor concerning resolution for fluoroscopic systems
is the:
a. Output phosphor
b. Video monitor
c. Input phosphor
d. TV camera - -Video monitor
- Since the Bucky tray cover is directly in line with the fluoroscopists gonads,
the opening must be automatically covered with ___ equivalent material.
a. 2.5 mm aluminum
b. 2.5 mm lead
c. 0.25 mm aluminum
d. 0.25 mm lead - -0.25 mm lead
- What percentage of incident photons will emerge unaffected by the
patients tissues?
a. 50%
b. 10%
c. 1%
d. 5%
. - -5%
- The primary purpose of protective drapes or sliding panels is to:
1. Reduce scatter to the patient
2. Reduce scatter to the operator
3. Reduce scatter to the image intensifier
4. Reduce radiation coming primarily from the patient - -2 and 4
- The components of the closed-circuit television system are:
1. vidicon camera
2. imaging intensifier
3. camera control unit
4. television monitor - -1, 3 and 4 only
- For fluoroscopic installations, the primary barrier is considered to be the:
1. Floor
2. Ceiling
3. Walls
4. Image intensifier assembly - -4 only
- The component in an image intensifier that regulates or changes the
amount of magnification in the virtual image is the:
