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RADT 456

ARRT Registry Review Content Covering Image Acquistion and Evaluation

QuestionAnswer
What does the term recorded detail refer to? the clarity, or resolution, with which anatomic structures are represented in the x ray image
What does the term distortion refer to? the misrepresentation o the actual size or shape of the stuctures imaged, which may cause object unsharpness
What term is used to describe the concept of recorded detail in electronic/digital imaging spatial resolution
How is resolution expressed? in line pairs per millimeter (lp/mm)
What does the term visibility of detail refer to? how well the recorded detail can be seen
In electronic/digital imaging the visiblity of detail is refered to as? contrast resolution
How are recorded detail and magnification related? inversely related, as recorded detail increases magnification decreases
Magnification is regulated by what two factors? SID and OID
How is SID related to magnification and recorded detail? SID is inversely related to magnification(increase SID decrease mag) and directly related to recorded detail( increase SID increase recorded detail)
How is OID related to magnification and recorded detail? OID is directely related to magnification and inversely related to recorded detail
How does subject/object unsharpness occur? when object shape does not coincide with shape of x ray beam, object is not parallel with tube/IR, anatomic object not in path of CR, anatomic object are a distance form IR
How does focal spot size affect detail? by influencing the degree of blur or unshparness
What is the greates adversary of recorded detail? motion
How can you minimize voluntary patient motion? good communication
How can you minimize involuntary patient motion? use shortest exposure time possible
What are the three types of rare earth phosphors? gadolinum, lantanum, yttrium
Intensifying screen speed increases and recorded detail decreases as...? phosphor size increases, active/phosphor layer thickness incrases, phosphor sensitivity increases, screen relectance incrases
Recorded detail increases as? focal spot size decreases, SID increases, OID decreases, motion decreases, distortion decreases, screen speed decreases
Why do we use intensifying screens? to decrease patient dose, increase tube life
What is responsible for 98% of film emulsion exposure? flourescent light
Created by: bnpickrell