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Image Acquisition

QuestionAnswer
recorded detail clarity, resolution, with which anatomic structures are represented in the x-ray image (Radiology Prep, p.298).
image quality image density, contrast or gray scale, recorded detail, and distortion (Radiology Prep, p.298).
geometric factors include: detail/resolution and distortion, distance, patient factors, focal spot size (Radiology Prep, p.298-308).
photographic factors include: motion and intensifying screens (Radiology Prep, p.309-313).
visibility factors include: density and contrast (Radiology Prep, p.314-348).
2 types of automatic exposure control (AEC) phototimer and ionization chamber (Radiology Prep, p.349).
fixed kV technique chart specifies a particular kV for each body part or type of exam (Radiology Prep, p.352).
variable kV technique the mAs is fixed and the kV is increased as part thickness increases (Radiology Prep, p.351).
digital images require: large amount of digital storage space, high bandwidth in PACS, and high resolution display monitors (Radiology Prep, p.354).
pixel 2-D, picture element, measured in XY direction. pixel pitch is the distance between pixels (Radiology Prep, p.355).
voxel 3-D, has depth, volume element, measured in Z direction (Radiology Prep, p.355).
matrix number of pixels in XY direction (Radiology Prep, p.355).
FOV how much of the part/ patient is included in the matrix (Radiology Prep, p.355).
pixel size affected by change in matrix size, and change in FOV (Radiology Prep, p.356).
CR spatial resolution improves with smaller pixel pitch, greater pixel/mm, greater sampling frequency (Radiology Prep, p.356).
functions of digital imaging systems sensor function, display function, and storage function (Radiology Prep, p.356).
PSP storage plate layers protective coat, reflective backing, polyester base support material, antistatic layer, lead foil backing (Radiology Prep, p.359).
CR resolution increases as PSP phosphor size decreases, laser beam size decreases, monitor matrix size increases (Radiology Prep, p.363).
CR features traditional x-ray equipment, uses IPs and cassettes, display, image preview and post processing (Radiology Prep, p.363).
DR features needs new equipment, uses no IPs or cassettes, immediate image display, image preview and post processing, higher DQE or lower patient dose (Radiology Prep, p.363).
types of artifacts handling, processing, and exposure (Radiology Prep, p.383).
information required on each x-ray image patient name/ identification number, side marker, examination date, institution's name (Radiology Prep, p.384).
optional information on each x-ray image patients age or date of birth, attending physician, time of day, radiographer identification (Radiology Prep, p.384).
film processing steps developer, fixer, wash, and dryer (Radiology Prep, p.386).
3 stages for PSP x-ray exposure, scanning/ reading, and erasure (Radiology Prep, p.390).
CR resolution increases as PSP phosphor size decreases, laser beam size decreases, monitor matrix size increases (Radiology Prep, p.406).
electronic imaging brightness changes with window level, contrast changes with widow width, has wide dynamic range/ latitude, fading can occur with delayed processing, IPs are very sensitive to x-ray fog (Radiology Prep, p.407).
exposure factors mA, time, kV, and distance (Radiology Prep, p.298).
factors that affect recorded detail/ resolution OID, SID, focal spot size, patient factors, intensifying screens, and motion (Radiology Prep, p.298).
distortion size distortion (magnification), and shape distortion (elongation. foreshortening) (Radiology Prep, p.298).
factors that affect distortion size distortion is affected by OID and SID; shape distortion is affected by alignment of the x-ray tube, anatomic part, and IR (Radiology Prep, p.298).
Created by: meechthebeech91