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RADT465: image prod.

ARRT- Equipment Operation & Quality Control and Image Acquisition & Evaluation

QuestionAnswer
What material is the input phosphor made of? Cesium Iodide
What material is the output phosphor made of? Zinc cadmium sulfide
How do you decrease magnification without the mag mode button? increase SID
What happens when grids are off center? Grid lines and overall decreased exposure
What happens when the grid is off level? Overall decreased exposure to image.
What happens when the grid is inverted/upside down? Severe decrease in exposure on outside of image
What is the purpose of AEC? It allows for images to fall within an acceptable range on a mixed population of patients
What is Radiation detector technology? It forms the latent image
What is a density adjustment? Amount of radiation used based on patient size.
How does bremsstrahlung radiation interact? Incoming electrons are slowed down in the target atom.
T/F- Characteristic radiation is where incoming electrons in the inner shell e- in the atom. True
What is the voltage ripple for a 3 phase six pulse? 13-14%
What is the voltage ripple for a 3 phase 12 pulse? 4%
What is the purpose of a tube rating chart? To limit a single exposure applied to the tube
What happens when the limit is exceeded on a cold anode? Cracking
What is a anode cooling chart? It stats the maximum heat capacity and rate of dissipation within the tube
What is formula for Ohm's law? V=IR
Increasing the kV will increase the ____ . Quality/penetrability
What affects the number of photons in the beam? mAs
What is the primary beam? How many photons are produced
What is the remnant beam? What exits out of the patient to create x-ray.
How often should shielding accessories be tested? Annually
How should shielding accessories be tested? Visually and under fluoro
Spatial resolution lp/mm
What is the definition of contrast resolution? Ability of a digital imaging system to display changes in gray values; bit depth
The actual exposure time must be within +/- ____ % of the indicated exposure time. 5%
The actual center of the x-ray beam must align to the indicator within ____ % of the SID 1%
The actual SID must be within ___% of the indicated SID 2%
The light field must align with the x-ray field collimation within +/- ____ % of the SID 2%
With _____, you should get an equal exposure despite any changes in thickness/density of the patient or technical factors. AEC
The actual kVp must be within +/- __ % of the selected kVp 5%
Exposure values for the same technical selection should be within +/- ___ % 5%
Changing mA from one setting to the next there should be no more than a ___ % change. 10%
How is erasure thoroughness checked? Using a small lead block, erased and then read again
Why is erasure thoroughness testing done? To prevent ghost images
What us used to test brightness/display contrast between two areas? Photometer
What is another word for brightness gain? Flux gain
What are tables usually made out of? Carbon fiber
Whats the four stage process to creating x-rays? X-rays-light-electrons-light
What is a drawback of AEC? You have to be more exact on positioning
What is the HU formula? kV x mA x seconds x generator factor
How are PSP plates cleaned? With anhydrous ethanol
How is beam restriction tested? Using the penny test
How often should imaging plates be cleaned? Every 24-48 hours.
What does a radiation physicist do? Quality checks for dept, acceptance testing, QC record
What's the purpose of rescaling an image? Maintains brightness and grayscale
What is quantum noise/mottle? loss of signal/missing signal
What is MTF? It describes the contribution of all system components
What is VOI? Recognized area within a collimated field
T/F- Equalization is values from grayscale True
Created by: Proviabi0
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