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Digital Imaging A

Digital Imaging

QuestionAnswer
one of the two types of digital imaging systems that is cassette based, the body part is obtained using storage phosphor in the cassette Computed radiography
the process of acquiring images of the body using x-rays displaying them digitally, viewing and storing them on a computer complete file Digital imaging
one of the two types of digital imaging systems; is cassetteless. The phosphor is bonded to a flat panel detector built into the x-ray table or chest board Digital radiography (DR)
detectors convert the x-ray energy directly to an electric signal through an amorphous selenium detector Direct conversion
a two-step process in which the x-ray energy is first converted to light & then converted into electrical signal using a scintillator Indirect conversion
a device that glows when hit by the high-energy x-ray photons and often is made of cesium iodide Scintillator
a phosphor used in computed radiography (CR)plates to absorb the x-ray energy and store it until it is processed by a special unit and laser light Photostimulable phosphor
an extensive networked group of computers, services and archives the image Picture archival and communication system (PACS)
the further adjusting of any image of a body part with the use of computer software Post processing
image comprised of continuous shades of gray from black to white Analog
relates the number of line pairs in a given length as cm or mm (lp/mm); data is sampled from an exposed detector in computed radiography/detector element-size (del) Sampling frequency
an array of small picture elements (pixels) that forms a matrix; each pixel is recorded Digital
the ability if an imaging system to resolve and render on the image a small high contrast object; determined primarily by the number of pixels in an image & therefore the size of each pixel Spatial resolution (digital) –
the dimensions of the field of view (fov) with in patients body not the size of displayed image Image size (digital)
range of exposures over which a detector can acquire image data and display contrast comparable to film latitude; the number of gray shades that an imaging system can reproduce. Dynamic range (digital receptors)
smallest exposure change (signal) difference that can be captured by a detector controlled by the dynamic range of the detector and quantization Contrast resolution (digital)
an option of post processing to improve the film Windowing
a part of windowing that adjusts the brightness; it identifies the type of tissue to be in focus (soft tissue or bone) Window level
determines the gray scale rendition of that tissue & therefore the image contrast Window width – (contrast)
measure of x-ray absorption efficiency; variation in detectors which predicts their efficiency; absorption coefficient; DQE Detector Quantum Efficiency
Created by: mdtodd