The care billis to insure that radiological services are
D. all the ansers
The half value layer (HVL) is a measurement of the beams
C. quality
Crossover is a radiographic problem because it decreases
C. recorded detail
Poor film-screen contact results in a loss of
A. detail
Common film artifacts include
D. all answers
The emulsion of the x-ray film consists of
D. silver halide crystals
SMPTE stands for?
Society of Motion Picture and Television Engineers
Medical images are transferred using the ____ standard.
A. DICOM
It is acceptable to perform a _____ test, instead of measuring the focal spot.
B. line pair
Screen characteristics (speed, detail etc) are determined by
A. all answers
Filtration is measured
A. in mm of Al equivalent
Developer can be contaminated by low amounts of
C. fixer
The quality of the beam is effected by
C. kVp setting
The Roentgen is a measure of the beams
D. intensity
Sensitometry is the study of
D. silver halide response to exposure and development
A cresent moon shaped dark artifact is caused by
C. crimped film
The timer must be accurate to witin
A. 5%
mAs linearity should be within
C. 10%
Repeat rates should be no more than?
3-10%
Film identification must have (as a minimum) what 5 items?
Patient ID
Patient name
Institutional name
Date of exam
Side (left of right)
What is the purpose of film processing?
get a latent image to a manefest image
The backup timer should be set to _____ of the expected time.
150%
Focal spot size is measured by a?
pin hole camers, star pattern test, line pair test
Standiong 7 feet from the patient, you receive a dose of 2.8mR per minute. If you move to a distance of 30 inches, what is your new exposure rate?
21.95 mR
A standard pattern made to meausre the resolution of digital display systems is called the
D. SMPTE pattern
Medical images are transferred using the ____ standard.
A. DICOM
The standard for Digital Imaging and Communication was developed by a commotte of the _____
B. ACR and NEMA
The consistent appearance of DICOM images on any compatable digital display device is acheived through
B. perceptual linearization
The quality control standard for flat panel displays was released by ____ in 1998.
C. VESA
The task group report 18 is a procedure manual for?
A. testing digital display devices
There are ____ types of photometers commonly used.
2
A photometer is a _____.
B. luminescence meter
A telescope photometer is used at _____ (what distance)?
1 meter
Digital display reflections and ambient light conditions are assessed with a ______.
B. illuminance meter
Luminance response can be tested with a
1. near range photometer
2. telescope photometer
3. illuminating meter
C. 1 or 2
Most of the wuality control testing of digital display devices is performed with the use of ____ test patterns.
D. AAPM TG-18
The TG-18LPV/LPH test is used to evaluate _____.
D. geometric distortion
Specular reflection is reduced with the use of
C. improved anti-reflective coating
Specular reflection can be tested with the
1. TG-18-AD pattern
2. ambient light turned on
3. ambient light turned off
C. 1,2 &3
Specular reflection can be assessed by only turning off the monitor in ambient light.
true or false
True
The qualitative evaluation of luminance response is measured with the ____ test tool.
D. TG18-CT
Spatial resolution of the digital display monitor is done with the ____ test pattern.
A. TG18-CX
Display noise is measured using the ______ test pattern.
D. TG18-AFC
Daily evaluation of the monitors should be done with the _____ test tool.
C. TG18-QC
T/F- Daily quality control testing is done by the medical physicist.
False
A continuous quality control program for digital display devices should include
1- acceptance testing of any new devices
2- routine quality control
3- periodic review of the program by a medical physicist
4- annual and post-repair performace evaluations
all answers
T/F-Veiling glare can be evaluated with the VG18 testing pattern.
