Digital radiography and PACS Exam Questions with Verified Answers Already Passed (Rated A+)

Digital radiography and PACS Exam Questions with Verified Answers Already Passed (Rated A+) conventional radiography - Answers an imaging technique that passes x-rays through the body, which expose x-ray film to produce a negative image called a radiograph Digital Imaging - Answers a process through which a picture is converted into a series of square electronic dots known as pixels Teleradiography - Answers moving images via telephone lines to and from remote locations Photostimulable phosphor (PSP) - Answers The phosphor layer of the imaging plate (IP) composed of barium fluorohalide crystals doped with europium Flat Panel Detector - Answers Type of digital detector employing amorphous silicon or selenium detector material, bonded with thin-film transistor technology for digital image creation and amplification TFT - Answers thin film transistors (converts electrons into an electronic signal) - used in flat panel detectors intensifying screen - Answers Device used to convert x-ray energy into visible light, which in turn exposes screen film charge coupled device - Answers device that converts light into electrical energy; used in digital cameras Indirect Capture DR - Answers devices that absorb x-rays and convert them into light; the light is then detected by an area-charge-coupled device or thin-film transistor array in concert with photodiodes, and then converted into an electrical signal that is sent to the computer for processing and viewing complementary metal-oxide semiconductor (CMOS) - Answers type of a sensor with technology that coverts x-rays into an electronic signal, which is sent to the computer analog - Answers A continuous method of representing information. Digital Signal - Answers A signal that encodes information as a string of 1's and 0's Analog-toDigital Conversion ( ADC) - Answers Analog signals converted to binary language CR speed - Answers the amount of light that strikes the IR exposure indicator - Answers Provides a numeric value indicating the level of radiation exposure to the digital IR Detective Quantum Efficiency (DQE) - Answers a measurement of the efficiency of an image receptor in converting the x-ray exposure it receives to a quality radiographic image rhodopsin - Answers the pigment in rod cells that causes light sensitivity artifact - Answers unwanted density on images backing layer - Answers soft polymer that protects the back of the cassette barcode label - Answers label attached either to the cassette or to the imaging plate that identifies the plate for the purpose of matching the examination to the plate bit depth - Answers The number of bits used to encode each sample during digitization. cassette - Answers Contains extraoral films during exposure collimation - Answers The restriction of the size and shape of the x-ray beam in order to reduce patient exposure. color layer - Answers Located between the active layer and the support that absorbs the stimulating light but reflects emitted light conductive layer - Answers absorbs and reduces static electricity fast scan direction - Answers movement of the laser across the imaging plate focus grid - Answers the range where the X-ray image can be produced grid frequency - Answers The number of lead strips per inch. grid ratio - Answers the ratio of the height of the lead strips to the distance between them imaging plate (IP) - Answers device that is made of a photostimulable phosphor that absorbs the photon energies exiting the patient; is located inside a computed radiographic cassette Kilovoltage peak (kVp) - Answers Highest voltage of x-ray tube used during an exposure laser - Answers light amplification by stimulated emission of radiation Milliamperage (mA) - Answers a measurement of x-ray tube current - the number of electrons crossing the tube from cathode to anode per second moire pattern - Answers A visually undesirable dot-exaggerating effect that occurs when two different screen patterns are randomly positioned or superimposed. phosphor center - Answers area within the phosphor layer where electrons are trapped phosphor layer (active layer) - Answers a layer of photostimulable phosphor that traps electrons during exposure Photodetector - Answers converts light photons into electrons Photostimulable phosphor (PSP) - Answers phosphor that produces light when stimulated by light or x-ray photons protective layer - Answers a thin, transparent coating placed over the emulsion Aliasing artifact - Answers occurs when tissue outside the Field of View is undersampled, causing a misregistration of anatomical location, in the phase direction, but on the opposite side of the anatomical location, also known as wrap-around artifact Archive query - Answers software function that allows historical information to be gathered from digital storage, such as multiple examinations, a range of dates, or by pathology automatic rescaling - Answers process by which images are produced with uniform brightness and contrast, regardless of the amount of exposure contrast manipulation - Answers conversion of the digital image using contrast enhancement parameters critical frequency - Answers the frequency of a signal that exactly matches the Nyquist frequency, resulting in a zero-amplitude signal caused by phase shifts edge enhancement - Answers a process by which the visual system makes edges as visible as possible, facilitating perception of where one object or surface ends in the retinal image and another begins high pass filtering - Answers technique for the enhancement of contrast and edge that amplifies the frequencies of areas of interest that are known (those frequencies that can be amplified) and suppresses frequencies outside the area of interest Histogram - Answers a bar graph depicting a frequency distribution Image annotation - Answers software function that allows text or markers to be digitally added to an image image orientation - Answers identification of the top or side of an image image stitching - Answers process of "sewing" together multiple images to form one continuous image Look Up Table (LUT) - Answers data that are stored to substitute new values for each pixel during processing low pass filter - Answers Attenuates high frequency energy but passes low frequency energy manual send - Answers computer function that allows images to be sent to specified reading