In each blank, try to type in the
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If your not sure what answer should be entered, press the space bar and the next missing letter will be displayed. When you are all done, you should look back over all your answers and review the ones in red. These ones in red are the ones which you needed help on. Term: DetectorDefinition: A system that uses to convert x-ray energy into an electrical signal through an intermediate stage that utilizes light photons. Term: DetectorDefinition: A system that uses photoconductors to convert x-ray energy directly into charge without the intermediate stage. Term: Amorphous Definition: An Indirect detector has a layer of ______. Term: Definition: A direct detector converts x-ray to electrical signal with amorphous _____. Term: CCD Definition: The CCD digital detector is based on an indirect conversion process and uses a ____ to convert light to electrical charge. Term: Scintillation Definition: The ______ detects x-rays and converts them into light. Term: Cesium Iodide, oxysulfideDefinition: The x-ray scintillation layer used in the direct flat-panel digital detector is usually either _____ ______ or _________ _______. Term: Phosphor/ScintillatorDefinition: Cesium Iodide crystals are arranged in a needle-like fashion and run in the of the x-ray beam. Term: Powdered Unstructured PhosphorDefinition: Gradolinium oxysulfide crystals are deposited as particles in the photodiode array. Term: Turbid Powdered Definition: Which type of phosphor or scintillation screen causes lateral spreading of light and decreases the spatial of the image? Term: layerDefinition: The purpose of a a-Si ______ ______ is to convert the light from the x-ray detection scintillator into electrical charges. Term: Definition: The ______ in a direct digital detector system converts the x-ray to an electrical signal. Term: Thin Film Definition: An array for readout of electrical charges generated by the photodiode layer in an detector system, or by the storage capacitor from the photoconductor of the direct detector system. Term: Definition: The sensing/storage element of an indirect flat-panel TFT detector is the _______. Term: Storage Definition: The sensing/storage element of a direct flat-panel TFT detector is the _____ ________ in the photoconductor. Term: Fill Definition: The of sensing area of the pixel to the area of the pixel itself. Term: Definition: Detectors with ____ fill factors will provide better spatial and contrast resolutions. Term: opticsDefinition: The _____ ______ in a CCD digital detector system reduces the output image from the scintillator phosphor to the size of the CCD array thereby reducing the image quality. Term: Signal noise Definition: The light optics reduces the image quality by reducing the ______to_____ _____. Term: Definition: Indirect detectors use a light-sensitive __________ to capture light and then produce electrical charges. Term: Definition: The direct detectors use a a-Se ____________ to convert x-ray energy directly into electrical charges. Term: seleniumDefinition: X-ray scintillators are CsI and Gradolinium oxysulfide for indirect flat-panel TFT detectors and a _______ for direct flat-panel TFT detectors. Term: latitudeDefinition: The response of the image receptor to the radiation upon it. Term: Definition: The exposure latitude for digital detectors is much _____ compared to the film-screen receptors. Term: Flat Definition: A pre-processing technique properly referred to as system calibration that detector performance integrity by removing artifacts. Term: Definition: The spatial resolution depends on the ____ of the pixels in the matrix. Term: ResolutionDefinition: The ability of an imaging system to resolve fine details present in an object. It's also referred to as the sharpness of the . Term: Modulation FunctionDefinition: A mathematical function that measures the ability of a detector to transfer its spatial characteristics to the image. Term: Definition: An MTF of __ represents a perfect . Term: Definition: As spatial frequency increases, the MTF _______. Term: oneDefinition: A perfect digital detector have a DQE of __. Term: Image Definition: also known as memory effect;The persistence of an image in a flat-panel detector due to charge still being produced the x-ray radiation beam has been turned off Term: rangeDefinition: The of a detector to different levels of radiation exposure. Term: Pre-processingDefinition: ____________ operations deal with applying corrections to the raw data. Term: Post-processingDefinition: _____________ operations address the appearance of the image displayed on a monitor for viewing and interpretation by a radiologist. Term: detector Definition: The flat-panel TFT digital detector is designed as a matrix of ______ _______. Term: ______ ________ involves the digital subtraction of images in time. A pre-contrast image(mask image) and post contrast images are digitally subtracted from the mask image.Definition: Temporal Term: The _____ _______ operation is based on subtraction of images taken at different kVps.Definition: subtraction |
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