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RADT 456
ARRT Registry Review Content Covering Image Acquistion and Evaluation
| Question | Answer |
|---|---|
| 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
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