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Image acquisition
ARRT registry review
| Question | Answer |
|---|---|
| What are the visibility factors of image quality? | density/brightness and contrast/gray scale (p.298) |
| What are the geometric factors of image quality? | detail/resolution and distortion (p.298) |
| Recorded detail is measured in what? | lp/mm (p.300) |
| SID is ______ related to recorded detail | directly (p.301) |
| OID is ______related to recorded detail | inversely (p.301) |
| What focal spot size provides the best recorded detail? | small (p.305) |
| What is the finite area on the tungsten target that is actually bombarded by electrons from the filament? | actual focal spot (p.305) |
| What is the foreshortened size of the focus as it is projected down the IR? | effective focal spot (p.305) |
| A larger focal spot equals ____ blur | more (p.308) |
| What is the best method of minimizing voluntary motion? | good communication and suspended respiration (p.309) |
| What is the best method of minimizing involuntary motion? | using the shortest possible exposure time (p.309) |
| What was Thomas Edison's intensifying screen made of? | calcium tungstate (p.310) |
| How much of the exposure received by the film emulsion is from fluorescent light emitted by intensifying screen phosphors? | 98% (p.311) |
| A particular phosphor's ability to absorb x-ray energy and convert it to fluorescent light energy | conversion efficiency (p.312) |
| When should fluorescence end when using an intensifying screen? | at the same time as the x-ray source (p.312) |
| What is it called when fluorescence doesn't stop on time? | lag (p.312) |
| screen speed is ______ related to phosphor size, phosphor layer thickness, and degree of reflective background | directly (p.312) |
| the intensity of light at a particular distance from its source is inversely proportional to the square of the distance | inverse square law (p.318) |
| As SID ______, exposure rate and image density decrease | increases (p.320) |
| Screen speed and patient dose are ________ proportional | inversely (p.322) |
| Screen speed and image density are ________ proportional | directly (p.322) |
| /what is the single most important way to reduce the production of scattered radiation? | collimation (p.322) |
| What is the total filtration Al equivalent used for patient protection purposes? | 2.5 (p.330) |
| X-ray tube total filtration has what effect on image density? | none (p.330) |
| What is the voltage ripple for 3p 6pulse? | 13% (p.334) |
| What is the voltage ripple for 3p 12 pulse? | 4% (p.334) |
| What is the voltage ripple for high frequency? | <1% (p.334) |
| A 6 in. air gap is equivalent to what grid ratio? | 8:1 (p.345) |
| Which type of AEC is beneath the table top but below the IR? | ionization chamber (p.350) |
| Which type of AEC is beneath the IR and charges a photomultiplier tube | Phototimer (p.350) |
| Which has better spatial resolution, CR/DR or SF? | SF (p.354) |
| Which has better contrast resolution, CR/DR or SF? | CR/DR (p.354) |
| What changes pixel size? | changing the matrix or FOV (p.356) |
| The higher the SNR, the _____the contrast resolution | better (p.356) |
| Appears as superimposed images slightly out of alignment, has a wrapping effect | aliasing (p.360) |
| PSP inconsistent scanning motion can result in a wavy or distorted image | laser jitter (p.361) |
| exposure data recognition (EDR) can correct images __% overexposed and ___% underexposed | 500%,80% (p.361) |
| Direct-capture systems eliminate which step of indirect-capture systems? | scintilattor step (p.364) |
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