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RADT465: image prod.
ARRT- Equipment Operation & Quality Control and Image Acquisition & Evaluation
| Question | Answer |
|---|---|
| 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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