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Bushong chapter 20

Processor maintenance Scheduled, Preventative, and non-scheduled.
Processor maintenance (Scheduled) routine procedures that are performed weekly/monthly.
Processor maintenance (Preventative) Planned program of parts replacement at regular intervals.
Processor maintenance (Non-scheduled) Failure in system that necessitates processor repair is a nonscheduled event.
When a bulb requires replacement... All bulbs in that illuminator should be replaced and matched to the type of bulb used in adjacent illuminators.
The viewbox illumination should be analyzed... photometrically on an annual basis with a photometer.
A Photometer measures light intensity.
Exposure reproducibility When selecting kVp or mAs, the tech expects OD and contratto be optimal. If any or all of these factors are changed and then returned to the previous value, exposure should be precisely the same.
Frequency and tolerance of QC on: Exposure reproducibility annually; +/- 5%
Exposure linearity The ability to produce a constant radiaition output for various combinations of mA and exposure time.
Frequency and tolerance of QC on: Exposure linearity annually; +/- 10%
Exposure timer accuracy Should be within 5% of indicated time for exposure times greater than 10 ms. Accuracy of 20% is acceptable for exposure times of 10 ms or less.
Frequency and tolerance of QC on: Exposure timer accuracy annually; +/- 5% >10 ms
Calibration of kVp A variation of approximately 4 % is necessary to affect OD and contrast.
Frequency and tolerance of QC on: Calibration of kVp annually; +/- 10 %
Focal spot size Determines spatial resolution.
3 tools that measure focal spot size: pinhole camera, star pattern, slit camera
Alternative tool that measures focal spot size Line pair test
Frequency and tolerance of QC on: Focal spot size annually; +/- 50%
Collimation Distance and centering indicators must be accurate to within 2% and 1% of SID
Accuracy of Collimation centering 1%
Automatic collimator PBL
Frequency and tolerance of QC on: Collimation semi-annual; +/- 2% SID
Filtration Measured by the half value layer.
Frequency and tolerance of QC on: Filtration annually; meet or exceed 2.5 mm Al
3 Steps of an acceptable QC program: Acceptance testing; Routine performance monitoring; Maintenance
5 steps of the Joint Commission's Quality Assurance Program: Assign responsibility; Delineate Scope of care; Identify aspects of care; Identify outcomes that affect aspects of care; establish limits of the scope of assessment.
Created by: lvilla