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Module 1

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Question
Answer
Which X-ray beam contains the useful or diagnostic information that is transferred to the image receptor?   show
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What is a major advantage of digital imaging over analog?   show
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show 1)Allows us to see structures that would have previously required additional imaging; 2)Radiologists can manipulate the image to see structures differently; 3)Making multiple copies is simple; 4)Can be electronically distributed  
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In an analog image receptor, the intensifying screen converts the __________ _______ _______ exiting the patient into __________.   show
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With an analog IR, the _______ is the recording device and uses the x-rays reaching the _________ and __________ produced by the intensifying screen to create the image.   show
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show Latent; Processed; Manifest  
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During Analog to Digital Conversion (ADC) the process of assigning numeric values to the analog output signal of the photo detector is termed ________________.   show
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The quantization of the analog signal to numeric values determines the __________ levels of the image.   show
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Binary language consists of a system of ______ symbols, either a _____ or _____ to manage data.   show
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Each number in binary language is called a _______, short for __________ _________.   show
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A _______ is a string of _____ bits, also referred to as a ________.   show
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show Bit Depth  
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show 64; 256  
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show 8 bits  
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show Side to side; Center; Center of an adjacent pixel  
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The size of each pixel within a matrix determines ___________ ___________.   show
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show Recorded Detail will Increase  
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show Recorded detail will decrease  
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show 3000 x 3000; 12; 512 x 512; 16  
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Name the 4 types of digital image receptors:   show
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Flat-Panel detectors with thin-film transistors can either be __________-based or _______________-based.   show
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____________: The ability of certain materials to respond to excitation and give off light.   show
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show 1)Absorption Efficiency 2)Conversion Efficiency 3)Detective Quantum Efficiency  
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show Absorption Efficiency  
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show Conversion Efficiency  
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show Detective Quantum Efficiency  
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show Red Laser Light; Blue light  
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What happens to the electrons in a PSP image plate after it is scanned and releases the energy from the X-ray beam?   show
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show Flat-Panel; Electrons; Amorphous Selenium or Amorphous Silicon  
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The Thin-Film Transistor in a flat-panel image plate collects the released electrons in an area of the circuit assembly called ___________ ___________ or _______.   show
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show Noise  
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The measure of the useful information captured to the nonuseful, random variations captured is referred to as the _________ to ___________ ratio.   show
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show Lower Light Levels  
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show Low-Dose imaging; Quickly; Instantly Refresh  
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show Fluoroscopic  
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show DQE  
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show More Efficient; Lower  
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show Spatial Resolution; Line Pairs per mm  
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show Line Pairs Per millimeter  
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show PSP; Pixel; Spatial Resolution  
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Lower sampling frequencies for a PSP plate reader means that __________ samples are taken and a __________ pixel size which will result in ___________ spatial resolution.   show
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Sampling frequencies for PSP readers can range from _______ pixels per mm to _______ pixels per mm. The _______ pixels per mm provides better spatial resolution.   show
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With Flat Panel Detectors (FPD) ___________ are collected in the ______s of the _______-________ _________.   show
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Thinking of the DELs in a Flat Panel Detector as a pixel: A DEL size that collects 50 microns compared to a DEL size that collects 200 microns will provide what kind of spatial resolution?   show
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show (1) 2.5 Line pairs/mm (2) 5 Line pairs/mm (3) 10 Line pairs/mm  
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show Twice  
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show 5; 10  
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Digital Receptors can produce an image that appears acceptable on a display monitor from _______ % underexposure through to _______% overexposure.   show
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To determine incorrect exposure values on a digital image, a technologist should be able to determine underexposure of less than 50% of the desired mAs because the image will look _________ or ___________.   show
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show Contrast; Penetrated (saturated)  
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show Equipment  
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What are the 3 sources of image blur?   show
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show FSS, SID, OID  
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show Input phosphor is decreased / Output phosphor remains the same.  
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These IR's use TFTs:   show
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These Flat Panel Detectors are "Direct Image Capture" devices which means what?   show
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The Flat Panel Detector that requires an extra step to convert light to electrons are what type of scintillation and uses amorphous ___________.   show
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show Cesium Iodide or Gadolinium Oxysulfide: Converts X-ray photons to light; Amorphous Silicon converts light to electrons  
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