-
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?
1%
-
Distance indicator allowance?
+\- 10%
-
Centering indicator allowance?
+\- 10%
-
Tube angle allowance?
+\- 1%
-
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.
+\- 10%
-
Actual settings between high and low mA stations may not be more than?
+\- 10%
-
The Wisconsin test cassette was used to test what?
kVp
-
Computerized dosimeters mesure kVp accuracy which may not be more/less than?
+\- 5%
-
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?
+\- 5%
-
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.
555, 505
-
The basic unit of photometrometry is scalled to the maximum photopic eye response at ____nm and is called the ________?
555, lumen
-
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
- Where:
- I1=Intensity at D1
- I2=Intensity at D2
- D1=Distance 1 D2=Distance 2
-
Cosine Law?
viewing angle: farther off square (90degrees) the dimmer and less quality an image has.
-
CRT? AMLCD?
- 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
-
NEMA-DICOM?
National Electrical Manufactureers Association- Digital Imaging and Communication
-
VESA?
Video Electronics Standard Association
-
FPDM?
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 ______?
TG 18-PX
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