Card Set Information
Accuracy and QC Equipment
Wire mesh test is used to test what?
contact between the screen and film
Light field and x-ray beam accuracy allowance?
+\- 2% of SID
Central ray allowance?
Distance indicator allowance?
Centering indicator allowance?
Tube angle allowance?
Timer accuracy single phase, method used?
+\- 5%, spin top test
Timer accuracy three phase, method used?
+\- 5%, syncronized motorized spin test
mA stations should be between _________ of actual mA selected.
Actual settings between high and low mA stations may not be more than?
The Wisconsin test cassette was used to test what?
Computerized dosimeters mesure kVp accuracy which may not be more/less than?
The half-value layer determines the amount of _______ that will reduce beam intensity to _________________.
filtration, 1/2 it's original value. "Beam quality"
Exposure reproducibility (mAs) uses computerized dosimeters to detect values that should not be more/less tahn?
Exposure rates for fluoroscopic systems shall not be more than?
2.1 R/min per mA station, or 10R/min maximum
Bright vision is best when the light wavelength is _____nm and dim vision is best at _____nm.
The basic unit of photometrometry is scalled to the maximum photopic eye response at ____nm and is called the ________?
Luminous Flux describes the total intensity of ____________.
light from a source.
Illuminance describes the intensity of light incident _______.
on a surface
Luminance intensity is a property of the source of light such as a ________ or a ___________.
view box, digital display device
Laws of Illumination?
Inverse square law, Cosine Law
What is the inverse square law, and formula?
strength is inversely proportional to the square of the distance from the source
I1/I2 = D2/D1
I1=Intensity at D1
I2=Intensity at D2
D1=Distance 1 D2=Distance 2
viewing angle: farther off square (90degrees) the dimmer and less quality an image has.
Cathode ray tube
active matrix liquid crystal display
______ resolution improves with the use of higher megapixel display devices.
Spatial: more pixels (in smaller array)= better resolution
SMPTE? Approved by?
Society of Motion Picture and Television Engineers, ACR- American College of Radiology
ACR stands for?
American College of Radiology
National Electrical Manufactureers Association- Digital Imaging and Communication
Video Electronics Standard Association
Flat Panel Display Measurement
AAPM TG 18?
American Association of Physicist in Medicine, task group 18
Luminance Meter: Near Range? Telescopic?
Near-meter on monitor
Telescopic- meter is one meter from monitor
Geometric distortion: Barrel distortion? Pincushion distortion?
Barrel- normally straight lines bow outward, Pincushion- normally straight lines bow inward
Reflection: Specular? Diffuse?
Specular- bright shiny reflection, diffuse- dim reflection
Luminance response uses test TG 18- ____, or ____, or ____.
TG 18-CT, TG 18-UN, TG 18-UNL
Display Resolution uses test TG 18 ____ or _______.
TG 18-CX or TG 18-QC
Resolution Uniformity uses test TG 18 ______?