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What Identifies grayscale values
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Image Production
Boards Study Radiography
| Question | Answer |
|---|---|
| What Identifies grayscale values | Bit depth |
| What is a histogram | graphic representation of pixel value distribution |
| 2 Thinkgs that describe gray scale | Dynamic Range and contrast resolution |
| VOI stands for | Volume of interest |
| Each cm of thickness increase.. | kVp +2 |
| 4-5 cm of added thickness | mA is doubled |
| APR stand for | Anatomic programmed technique |
| MTF | Modulation Transfer Function Degree of resolution or detail transferred to the IR resolving power of each system components. Mathematical |
| EDR stand for | Exposure Data Recognition Offer wide latitude and automaticoptimiztion of image Uses selected processing algorithm and LUT 80% under 500% over |
| Barium Fluorohalide | PSP plate, Europium Doped |
| Europium | Over Barium Fluorohalid on PSP plate |
| urticaria | hives |
| Anaphylactic shock: Dysphagia or Dysphasia | Dysphagia-- Difficulty swallowing |
| Name of improper partitioning of the IP | Failure of exposure field recognition |
| CR artifacts that appear as random small black spots are usually representitive of | fog from environmental sources |
| exposure timer accuracy should be within what percentage of the selected exposure time | 5% |
| With a selected mA, exposure time, and kVp, repeated exposures should produce identical radiation output called | Exposure reproducibility |
| When evaluating kVp calibration, the measured kVp should be within what percentage of the selected kVp | 10% |
| what material is the image intesifier's input phosphor usually made of | Cesium Iodide |
| How does the image on the IIs output phosphor comare with the image on its input phosphor | output phosphor is minified, brighter and inverted |
| what is the term used to describe radiation dose and volume orf irradiated tissue | Dose Area Product |
| Scintilation made out of (2) | gadolinium oxysulfide and Cesium iodide |
| The storage screens typically used in CR contain what type of phosphor material | Europium-activated barium fluorohalide |
| Certain materials emit light when they are exposed to another type of light. This characteristic is called | Photostimulable luminescence (PSL) |
| What two kinds of devices may be used to convert the fluoroscopic output phosphor image into an electrical signal | CCD and TV camera |
| a 0.5 mm Pb equivalent apron will attenuate what percentage of the scattered beam at 100 kVp | 75% |
| What traditional unit measures X or gamma radiation only | Roentgen |
| What two ways do the PSP europium-activated barium fluorohalide phosphors react when stimulated by x-ray exposure | They emit some light, and they store some energy as the latent image |
| What does sampling frequency of PSPs impact spatial resolution? | As sampling frequency increases increases, spatial resolution increases |
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