RADT1200 CHAPTERS 11, 12, 15 & 16
QUESTIONS AND ANSWERS
All digital imaging devices are subject to certain artifacts such as
1. aliasing
2. moire patterns
3. contouring - Answer- all of the options
the protective tube housing serves as a shield against _______ entering the X-ray
tube, thereby preventing electric shock while also facilitating the cooling of the X-ray
tube. - Answer- the high voltage
when using digital fluoroscopy systems. making use of the last image hold feature
can - Answer- be an effective dose reduction technique
what is the purpose of radiographic beam filtration? - Answer- eliminate the need
to collimate the primary beam
most fluoroscopic examinations employ a range of _____ kVp for adult patients
depending on the body area being examined - Answer- 75-110
when performing a mobile radiographic procedure, to reduce the radiation exposure
to the patient, the radiographer must use a minimal source-to-skin distance of at
least - Answer- 30 cm
when a fluoroscopic image is electronically amplified by the use of an image
intensification system, which of the following benefits results?
1. increased image brightness
2. saving of time for the radiologist
3. patient dose reduction - Answer- all of the options
during a fluoroscopic examination, a resettable cumulative timing device measures
the x-ray beam-on time and sounds an audible amaro or in some cases, temporarily
interrupts the exposure after the fluoroscope has been activated for what length of
time? - Answer- 5 minutes
during interventional procedures, high-level control fluoroscopy is employed,
resulting in a ______ or entrance dose rate to patient to allow the examination of
smaller and lower-contrast objects that are not ordinarily discerned during standard
fluoroscopy - Answer- higher entrance exposure rate
, when obtaining a dorsoplantar projection of the foot, which of the following types of
filters should be used to provide greater uniform density of the anatomy? - Answer-
wedge filter
Digital radiography systems offer several advantages over computed radiography.
Some of these include
1. lower dose
2. ease of use
3. immediate imaging results
4. manipulation of the image - Answer- all of the options
total filtration of _____ for fixed x-ray units operating above 79 kVp is the regulatory
standard. - Answer- 2.5-mm aluminum equivalent
in digital radiography the number of different shades of gray that can be stored in
memory and displayed on a computer monitor is termed - Answer- grayscale
digital radiography images can be accessed - Answer- at several workstations at
the same time, thus making image viewing very convenient for physicians providing
patient care
when an exposed computed radiography imaging plate is ready to be processed, an
imaging reading unit is used to scan the photostimulable phosphor imaging plate
with - Answer- a helium-neon laser beam
fluoroscopic devices are capable of subjecting the patient, the equipment operator,
and other personnel near the fluoroscopic equipment to substantial doses of ionizing
radiation. these devices include
1. c-arm fluoroscopes
2. fluoroscopes on stationary equipment with HCL mode used for interventional
procedures
3. biplane interventional fluoroscopic systems - Answer- all of the options
of the following procedures, which involve extended fluoroscopic time?
1. biliary drainage
2. stent and filter placement
3. urinary or biliary stone removal - Answer- all of the options
Luminance is determined by measuring the concentration of light - Answer- over a
particular field of view
the control panel, where technical exposure factors are selected and visually
displayed for the equipment operator, must be located - Answer- behind suitable
protective barrier that has a radiation-absorbent window that permits observation of
the patient during any procedure
QUESTIONS AND ANSWERS
All digital imaging devices are subject to certain artifacts such as
1. aliasing
2. moire patterns
3. contouring - Answer- all of the options
the protective tube housing serves as a shield against _______ entering the X-ray
tube, thereby preventing electric shock while also facilitating the cooling of the X-ray
tube. - Answer- the high voltage
when using digital fluoroscopy systems. making use of the last image hold feature
can - Answer- be an effective dose reduction technique
what is the purpose of radiographic beam filtration? - Answer- eliminate the need
to collimate the primary beam
most fluoroscopic examinations employ a range of _____ kVp for adult patients
depending on the body area being examined - Answer- 75-110
when performing a mobile radiographic procedure, to reduce the radiation exposure
to the patient, the radiographer must use a minimal source-to-skin distance of at
least - Answer- 30 cm
when a fluoroscopic image is electronically amplified by the use of an image
intensification system, which of the following benefits results?
1. increased image brightness
2. saving of time for the radiologist
3. patient dose reduction - Answer- all of the options
during a fluoroscopic examination, a resettable cumulative timing device measures
the x-ray beam-on time and sounds an audible amaro or in some cases, temporarily
interrupts the exposure after the fluoroscope has been activated for what length of
time? - Answer- 5 minutes
during interventional procedures, high-level control fluoroscopy is employed,
resulting in a ______ or entrance dose rate to patient to allow the examination of
smaller and lower-contrast objects that are not ordinarily discerned during standard
fluoroscopy - Answer- higher entrance exposure rate
, when obtaining a dorsoplantar projection of the foot, which of the following types of
filters should be used to provide greater uniform density of the anatomy? - Answer-
wedge filter
Digital radiography systems offer several advantages over computed radiography.
Some of these include
1. lower dose
2. ease of use
3. immediate imaging results
4. manipulation of the image - Answer- all of the options
total filtration of _____ for fixed x-ray units operating above 79 kVp is the regulatory
standard. - Answer- 2.5-mm aluminum equivalent
in digital radiography the number of different shades of gray that can be stored in
memory and displayed on a computer monitor is termed - Answer- grayscale
digital radiography images can be accessed - Answer- at several workstations at
the same time, thus making image viewing very convenient for physicians providing
patient care
when an exposed computed radiography imaging plate is ready to be processed, an
imaging reading unit is used to scan the photostimulable phosphor imaging plate
with - Answer- a helium-neon laser beam
fluoroscopic devices are capable of subjecting the patient, the equipment operator,
and other personnel near the fluoroscopic equipment to substantial doses of ionizing
radiation. these devices include
1. c-arm fluoroscopes
2. fluoroscopes on stationary equipment with HCL mode used for interventional
procedures
3. biplane interventional fluoroscopic systems - Answer- all of the options
of the following procedures, which involve extended fluoroscopic time?
1. biliary drainage
2. stent and filter placement
3. urinary or biliary stone removal - Answer- all of the options
Luminance is determined by measuring the concentration of light - Answer- over a
particular field of view
the control panel, where technical exposure factors are selected and visually
displayed for the equipment operator, must be located - Answer- behind suitable
protective barrier that has a radiation-absorbent window that permits observation of
the patient during any procedure
