CRDR Test Comprehensive Practice Exam Questions 100% Verified Pass

The photostimulable phosphor in a CR cassette is a barium fluoride that is doped with? - correct answer Europium The quality of digital image depends on which of the following - correct answer Special resolution, brightness AND contrast Which of the following layers of CR imaging plate reduces light and reduces scatter? - correct answer Conductive layer Which of the following systems captures the x-ray converts to light and then to digital - correct answer indirect digital imaging WOF is/are found in a detector element of a flat panel detector? - correct answer 1, 2, and 3 Charged collection area (matric or array), Capacitor, Thin Film transistor CCD is - correct answer charged coupled device Visually dynamic range is - correct answer the shades of grey WOF refers to text added to the image - correct answer annotations What is the technical name for the computed radiology image plate? - correct answer Photostimuable Phosphor Plate WOF is a disadvantage of computed radiography? - correct answer Spatial resolution When an image is extracted from a flat panel detector, the following occurs? - correct answer 1. Data is read by columns and rows 2. Data is digitized 3. Histogram is made WOF is least sensitive to low levels of radiation? - correct answer X-ray Film In digital radiography, Nyquist Theorem is refered to WOF? - correct answer Sampling of frequency of digital data Edge Enhancement can be can be applied to a digital image to improve WOF? - correct answer The contrast along the edge of the structures WOF can be used to reduce patient exposure since CR imaging plates require more exposure than film screen systems? - correct answer 1,2, AND 3 higher kv, increase beam filtration, and use of AEC's ___________ Phosphors are randomly suspended in a phosphor layer, where as ___________ phosphors are formed into columns - correct answer turgid and structured Contrast resolution is a major advantage of digital imaging, what determines high contrast resolution in a digital image? - correct answer High exposure, low noise There are direct and indirect ways to capturing an x-ray image with flat panel detector digital systems, arrange the following the following in order: - correct answer Fluorescent layer Photoconductor layer than TFT layer (TFT is always LAST) Dirt shows up as - correct answer white lines WOF is true concerning indirect vs direct DR? - correct answer Less exposure to the patient and LESS resolution WOF statements would define spacial resolution? - correct answer Measure of amount of detail in the image WOF image plates should be selected to produce an image with the best spacial resolution - correct answer 8 X 10 How well an imaging system reproduce the sharpness of an actual object - correct answer MTF One of the most important aspects of the digital imaging is the ability of the computer to mathematically change, which controls brightness? - correct answer window level The histogram is used to automatically rescale the image to a proper brightness, WOF can cause an error? - correct answer Metal in the field, exposure field detection, gross over exposure (saturation) WOF controls contrast in a digital system? - correct answer Look-up table (LUT) After the values of interest have been determined by the histogram WOF is used to readjust to get the proper contrast? - correct answer LUT Artifact cause by intense heat is - corre