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Medical Physics |
1 From the U.S. Food and Drug Administration, Center for Devices and Radiological Health, 1350 Piccard Dr, Rockville, MD 20850. Received December 15, 1997; revision requested March 11, 1998; final revision received October 4, 1999; accepted October 26. Address correspondence to R.V.K. (e-mail: rvk@cdrh.fda.gov).
PURPOSE: To provide public health information by means of measurement of the radiation exposures that patients undergoing chest radiography would receive and to compare the results with those of a similar previous survey.
MATERIALS AND METHODS: Surveyed facilities were randomly selected from each state. Patient exposure was evaluated along with film processing, half-value layer, and image quality. Additional information obtained concerned type of equipment, facility work load, radiographic technique, screen-film system, and grid type.
RESULTS: Mean entrance air kerma in all facilities was 141 µGy (16.1 mR). Mean kilovoltage in all facilities was 101 kV. In 1994, 140 (90%) of 156 hospitals (vs 71% in 1984) and 92 (58%; nearly double the percentage in 1984) of 159 nonhospital sites were using grids. Scoring with the imaging test tool resulted in a mean spatial resolution of 2.3 cycles per millimeter, and a mean low-contrast sensitivity of about 3%. Two hundred fifty-three (80%) of 315 facilities surveyed were processing film at minimum acceptable performance levels.
CONCLUSION: Mean entrance air kerma for all facilities did not substantially change. Although increased grid usage would lead to the expectation of higher measured exposures, this was offset by an increase in the use of faster screen-film combinations.
Index terms: Images, quality, 60.11 • Quality assurance • Radiations, exposure to patients and personnel, 60.11 • Radiations, measurement, 60.11 • Screens and films • Thorax, radiography, 60.11
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