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Clinically acceptable tolerance of roentgen generator exposure parameters
Acta Radiologica (Stockholm, Sweden : 1987)
|January 1, 1987
Summary
Radiologists and technicians found radiographs acceptable even with minor exposure variations. This study suggests acceptable tolerances for roentgen generator calibration to ensure diagnostic image quality.
Area of Science:
- Medical Physics
- Radiologic Technology
- Diagnostic Imaging
Background:
- Accurate calibration of roentgen generator scales is crucial for diagnostic imaging.
- Modern equipment requires defined tolerance levels for maintenance and calibration.
Purpose of the Study:
- To investigate clinical demands for roentgen generator accuracy.
- To define acceptable tolerance levels for calibration and maintenance of modern X-ray equipment.
Main Methods:
- Radiographs of four body parts with varying film densities were produced.
- 59 radiologists and 53 radiologic technicians evaluated radiograph acceptability.
- Exposure data estimations from 38 radiologic technicians were analyzed.
Main Results:
- Ninety-five percent of radiographs were accepted with a one mAs step under- or overexposure.
- Clinically acceptable tolerances for roentgen generator exposure parameters were derived.
- Suggested tolerances: tube voltage (kV) +/- 5%, current-time product (mAs) -20% to +25%, and automatic exposure control (AEC) -20% to +25%.
Conclusions:
- Established acceptable tolerance ranges for key roentgen generator parameters.
- Recommendations provided for calibration and preventive maintenance of X-ray equipment.
- Findings support maintaining diagnostic image quality while allowing for practical equipment variations.