Quality Assurance for Diagnostic Imaging Equipment (Ncrp by NCRP


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Additional resources for Quality Assurance for Diagnostic Imaging Equipment (Ncrp Report : No. 99)

Example text

In that hospital, errors in technique accounted for 87 percent of the total number of repeats (54 percent because the radiographs were too light and 33 percent because the radiographs were too dark). Although part ofthis was corrected by quality control measures, further improvement was possible only after moving to a 28 1 4. 8 percent). Methods of Retcrke Anulysis. The number of retakes can be estimated from a room log, but it may be inaccurate. A formal retake analysis is a time-consuming and complicated procedure.

Upper and lower control limits must be determined. If these are reached or exceeded, corrective action is required. These control limits can apply, for instance, to the limits in acceptable density for a sensitometric strip or the limits on radiation emitted a t a certain mA and kVp setting of a machine. The upper and lower control limits should be established so that the diagnostic value of the image will not be significantly compromised before the limits are reached and corrective action is required.

2. To ensure the greatest possible utilization of imaging equipment (particularly for exceptionally costly or scarce equipment). 3. To ensure most efficient sequence of studies. 4. To minimize patient and personnel waiting time. Suggested Policy: 1. All studies requiring preparation or utilization of specialized equipment shall be scheduled in advance, and instructions concerning proper preparation, if any, shall be given to the patient. Comment: It is usually not necessary to schedule conventional studies that may be performed in any of several rooms.

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