Fluoroscopy 2024 Real Exam Questions with All Correct Answers
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Course
Fluoroscopy
Institution
Fluoroscopy
Fluoroscopy 2024 Real Exam Questions with All Correct Answers
What is the most common material used for radiation shielding? - Answer- Lead or Lead equivalent
What type of image intensifier artifact results from projecting an image onto a flat surface? - Answer- Pincushion Distortion
It is ...
Fluoroscopy 2024 Real Exam
Questions with All Correct
Answers
What is the most common material used for radiation shielding? - Answer- Lead or Lead
equivalent
What type of image intensifier artifact results from projecting an image onto a flat
surface? - Answer- Pincushion Distortion
It is caused by projecting an image from a curved surface (input phosphor) onto a flat
surface (output phosphor) With pincushion distortion, magnification increases towards
the periphery.
The average effective dose for a diagnostic x-ray examination is said to be? - Answer-
.39mSv (39mrem)
Which unit of measure is the International System of Units (SI) term for dose
equivalent? - Answer- Sievert (Sv) expressed as a SI unit or roentgen equivalent man
(rem) the conventional unit.
1 Sv = 100 rem & 1 rem = .01 Sv
What is the annual effective dose limit for occupational workers per NCRP? - Answer-
50mSv (5rem)
Which 2 agencies are responsible for regulating the design & manufacture of x-ray
equipment? - Answer- The Food and Drug Admnistration (FDA)
Center for Devices and Radiological Health (CDRH)
Beam limiting devices such as light field radiation should be assessed how often? -
Answer- Every 6 months
Beam limiting devices include light field radiation, field congruence, image receptor-
radiation field alignment, accuracy of the x-y scales and illuminator bulb brightness
should have quality control tests performed every 6 months or semiannually.
What type of Image Intensifier artifact results
,from warping of an image along an S-shaped axis & is the result of a strong magnetic
field? - Answer- S-Distortion artifact
What is the maximum amount of lag for cardiac, vascular & interventional studies? -
Answer- 10%
The maximum amount of lag should be less than 10% for cardiac, vascular &
interventional studies because a .014 inch moving guide wire must be visualized.
What is the difference when comparing digital subtraction angiography (DSA) to
conventional film method? - Answer- The DSA has a wider exposure latitude.
The advantages of DSA over the film method
include wider exposure latitude, computerized enhancement image contrast & quick
image
acquisition.
This scan mode by x-rays delivers radiation in a short, high intensity pulse. What is it? -
Answer- Pulse interlace scan mode.
The x-ray tube delivers radiation in a short, high intensity pulse at about one per
second. This reduces quantum mottle & increases resolution & SNR. This pulse mode
also can reduce patient dose.
How is Workload defined? - Answer- The measurement of radiation output Workload
(W).
This is usually expressed using several factors including kVp range, mAs range,
patients per day, usage & the # of images taken.
Which item best describes an image device, used in fluoroscopy that results from the
target material in the camera, which is made up of antimony trisulfied, which in turn has
a relatively long lag time. This relatively long lag time is helpful in GI studies. - Answer-
Vidicon Camera
It is currently the most common type of video camera in fluoroscopic system.
The target material in the camera is made up of antimony trisulfied which in turn has a
relatively long lag time which is helpful in GI studies.
The video monitor of a fluoroscopy system should be evaluated with a test pattern
created by the __________________________________ organization. - Answer-
Society of Motion Picture & Television Engineers (SMPTE)
They recommend the medical
, diagnostic imaging test pattern for television monitors & hard copy recording cameras.
The intensity of the x-ray beam at tabletop should not exceed___R/min for units
equipped with Automatic Brightness Control (ABC).
ABC & 5R/min for units without ABC - Answer- 10R/min
The intensity of the x-ray beam at tabletop should not exceed___R/min for units NOT
equipped with Automatic Brightness Control (ABC). - Answer- 5R/min for units without
ABC
What type of Image Intensifer artifact results from a decrease in image brightness at the
lateral portions of the image? - Answer- Vignetting Distortion
It is a decrease in image brightness at the lateral portions of the image & is caused by a
combination of pincushion distortion & the coupling of the television camera to the
output phosphor.
What is the maximum skin exposure in fluoroscopy? - Answer- 10 R/min mandated by
FDA
What is the following source to skin distance for a fixed or stationary fluoroscopic unit? -
Answer- 38 cm or 15 inches standard by the FDA
What is the purpose of a collimator? - Answer- Limit or Confine the beam into a given
area.
Lead shutters aka the collimator's main
purpose is to limit or confine the beam into a given area. By doing this it reduces scatter
radiation from the patient, thereby reducing patient dose and improve picture quality.
What is an example of an acute somatic of radiation? - Answer- Temporary Hair Loss,
acute somatic effects occur when a dose of approximately .1Gy
(10rad) or greater is applied to the entire body over a short period of time.
Which device best describes an image monitoring device, used in fluoroscopy, that
results from a television camera focused onto the output phosphor & then displayed on
a monitor? - Answer- Closed circuit television monitoring (CCTV) is the most common
method for monitoring
the fluoroscopic image.
The television camera is focused onto the output phosphor & the image is displayed on
the monitor.
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