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Patient dose optimization in plain radiography based on standard exposure factors

¹ Medical Physics Directorate and ² Imaging Directorate, University Hospital of North Staffordshire NHS Trust, Princes Road, Hartshill, Stoke on Trent ST4 7LN, UK

View larger version (15K): [in a new window]   Figure 1. Comparison of thermoluminescent dosemeter (TLD) measured entrance surface dose (ESD) with the value calculated from the exposure factors used for a sample of six X-ray units for (a) posteroanterior (PA) chest and (b) anteroposterior (AP) abdomen examinations.

View larger version (15K): [in a new window]   Figure 2. Comparison of calculated entrance surface dose (ESD) for exposure factors in the standard charts with those actually used in practice for a sample of six X-ray units for (a) chest and (b) abdomen examinations. TLD, thermoluminescent dosemeter.

View larger version (19K): [in a new window]   Figure 3. Calculated entrance surface dose (ESD) for each item of X-ray equipment for anteroposterior pelvic examination for (a) the first study (2001) and (b) the second study (2003). The dotted line shows the national diagnostic reference level (DRL) for this examination. Equipment owned by the Trust to which the report was issued is highlighted by shaded bars and each bar represents one X-ray tube.

View larger version (23K): [in a new window]   Figure 4. Difference in mean entrance surface dose (2003 study compared with 2001 study) for 47 types of X-ray procedure carried out in six trusts. Data are included only for Trusts participating in both studies for a given examination.