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RADT 465 Img. Acq

ARRT Review coering Image Acquisition and Evaluation

Exposure factors include: (pg.298) mA, time, kV, distance
Visibility factors include: (pg. 298) Density/Brightness and Contrast/Gray Scale
Geometric factors include: (pg. 298) Detail/Resolution and Distortion
refers to the clarity, or resolution, with which anatomic structures are represented in the x-ray image (pg. 298) recorded detail
refers to size distortion (pg. 298) magnification
refers to shape distortion (pg.298) elongation/foreshortening
Factors that affect size distortion/ magnification: (pg. 298) OID and SID
Factors that affect shape distortion: (pg. 298) Alignment of the x-ray tube, anatomic part, and IR
The term used to describe the IR's impact on recorded detail in CR/DR is: (pg. 300) spatial resolution
Recorded detail and magnification are ______ related. That is recorded detail _______ and magnification decreases. (pg 301) inversely, increases
SID is ________ related to magnification. (pg. 301_ inversely
SID is ______ related to recorded detail. (pg. 301) directly
OID is ______ related to magnification. (pg. 301) directly
OID is _________ related to recorded detail (pg. 301) inversely
True or False Changes in OID impact detail more significantly than similar changes in SID. (pg. 301) TRUE
The anode heel effect is most pronounced using: (pg. 309) large IRs, short SIDS, and small anode angles
Peristaltic activity, muscle spasms, and heart action are considered _____________ motion. (pg. 309) involuntary
The best way to minimize involuntary motion: (pg. 309) use the shortest possible exposure time
To minimize voluntary motion: (page 310) Use good communication and suspended respiration
Gadolinium, Lanthanum, Yttrium are all: ( pg. 311) Rare earth phosphors
_______ is responsible for more than 98% of film emulsion exposure. (pg. 313) Fluorescent light
Any combination of mA and time that will produce a given mAs will produce identical radiographic density according to the: (pg. 318) reciprocity law
At least a ___% change must be made in mAs for there to be a perceptible change in radiographic density. (pg. 318) 30
As SID increases, exposure rate and image density _______. (pg. 320) decrease
Increased kV produces ____ high energy photons, so exposure rate increases. (pg. 321) more
Screen speed and image density are _____ proportional. (pg. 322) directly
Screen speed and patient dose are _____ proportional. (pg. 322) inversely
High contrast is: (page. 340) short-scale contrast
Low contrast is: (page. 340) long-scale contrast
High contrast displays: (page 340). few, very different, image/tissue densities
Created by: jkcottongim