CA Fluoro Test |99 Questions and
Answers
An image intensifiers photocathode causes ___ to be given off in direct
proportion to the intensity of the fluorescent light - -Electrons
- What fluoroscopic television system device decodes the video signal into a
visible image? - -Television Monitor
- Which of the following materials are used in the construction of a
fluoroscopic tabletop? - -Aluminum
Bakelite
Carbon fiber
- Shape distortion is caused primarily by - -Geometric factors in the shape
of the image intensification tube
- If the entrance skin dose is measured from the surface of the tabletop, the
x-ray source is located - -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
- During a fluoroscopic exam, the main source of scattered radiation is
produced from - -The Patient
- Excessive lighting in the fluoroscopy room: - -May result in increasing the
technical operating factors
- For fluoroscopic installations, the primary barrier is considered to be the - -
Image intensifier assembly
- The input phosphor of an image intensification tube - -1. absorbs x-rays
2. is a layer of fluorescent material
- Images produced with photo spot film cameras ___ spot films taken with
conventional cassettes - -require about 1/2 to 1/3 the dose of
- When the magnification mode is used, an increase in image intensifier
resolution will increase from - -4 lp/mm to about 6 lp/mm
, - Remnant, exit, or imaging forming radiation consists of - -1. Non-
interacting photons
2. Small-angle scattered photons
- The overall resolution of the imaging system is expressed in terms of its - -
Modulation transfer function (MTF)
- Size distortion is primarily caused by - -Object-to-image distance (OID)
- Why is it important to coordinate the video signal between the TV camera
and the TV monitor - -To avoid unnecessary flicker in the television picture
- Resolution - -The ability of an imaging system to differentiate small
objects that are closely spaced as separate objects
- 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
- How will the fluoroscopic image brightness be affected as the fluoroscopic
field of view (FOV) is reduced with tighter collimation? - -Image brightness
will not change
- When the fluoroscopy beam-on time has exceeded a predetermined limit,
the cumulative manual-reset timer must either - -1.Produce an audible
signal
2.Interrupt the x-ray beam
- The greatest distribution of fluoroscopic examinations (approximately 53%)
are performed on which body part? - -GI Tract
- The Input phosphor of an image intensification tube - -1. absorbs x-rays
2. is a layer of fluorescent material
- By selecting ___ one can achieve obtain maximum differential absorption of
the tissues in order to produce a high-quality fluoroscopic image - -Peak
kilovolts
- The "visibility" of mottle in the virtual image is determined by the ___ of
the system in use: - -1. Resolution
2. Sensitivity
3. Contrast level
- What fluoroscopic television system device decodes the video signal into a
visible image - -Television Monitor
Answers
An image intensifiers photocathode causes ___ to be given off in direct
proportion to the intensity of the fluorescent light - -Electrons
- What fluoroscopic television system device decodes the video signal into a
visible image? - -Television Monitor
- Which of the following materials are used in the construction of a
fluoroscopic tabletop? - -Aluminum
Bakelite
Carbon fiber
- Shape distortion is caused primarily by - -Geometric factors in the shape
of the image intensification tube
- If the entrance skin dose is measured from the surface of the tabletop, the
x-ray source is located - -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
- During a fluoroscopic exam, the main source of scattered radiation is
produced from - -The Patient
- Excessive lighting in the fluoroscopy room: - -May result in increasing the
technical operating factors
- For fluoroscopic installations, the primary barrier is considered to be the - -
Image intensifier assembly
- The input phosphor of an image intensification tube - -1. absorbs x-rays
2. is a layer of fluorescent material
- Images produced with photo spot film cameras ___ spot films taken with
conventional cassettes - -require about 1/2 to 1/3 the dose of
- When the magnification mode is used, an increase in image intensifier
resolution will increase from - -4 lp/mm to about 6 lp/mm
, - Remnant, exit, or imaging forming radiation consists of - -1. Non-
interacting photons
2. Small-angle scattered photons
- The overall resolution of the imaging system is expressed in terms of its - -
Modulation transfer function (MTF)
- Size distortion is primarily caused by - -Object-to-image distance (OID)
- Why is it important to coordinate the video signal between the TV camera
and the TV monitor - -To avoid unnecessary flicker in the television picture
- Resolution - -The ability of an imaging system to differentiate small
objects that are closely spaced as separate objects
- 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
- How will the fluoroscopic image brightness be affected as the fluoroscopic
field of view (FOV) is reduced with tighter collimation? - -Image brightness
will not change
- When the fluoroscopy beam-on time has exceeded a predetermined limit,
the cumulative manual-reset timer must either - -1.Produce an audible
signal
2.Interrupt the x-ray beam
- The greatest distribution of fluoroscopic examinations (approximately 53%)
are performed on which body part? - -GI Tract
- The Input phosphor of an image intensification tube - -1. absorbs x-rays
2. is a layer of fluorescent material
- By selecting ___ one can achieve obtain maximum differential absorption of
the tissues in order to produce a high-quality fluoroscopic image - -Peak
kilovolts
- The "visibility" of mottle in the virtual image is determined by the ___ of
the system in use: - -1. Resolution
2. Sensitivity
3. Contrast level
- What fluoroscopic television system device decodes the video signal into a
visible image - -Television Monitor
