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A parametric method for determining mammographic X-ray tube output and half value layer

Regional Medical Physics Department, Newcastle General Hospital, Westgate Road, Newcastle upon Tyne NE4 6BE, UK

View larger version (10K): [in a new window]   Figure 1. Plot of log10(air kerma) against log10(kV) for the molybdenum target/filter combination (Mo/Mo). The three sets of data represent the following sets of conditions: , 36.1 µm Mo, 1.75 mm Perspex; , 25 µm Mo, 1 mm Perspex; , 45 µm Mo, 3 mm Perspex. Solid lines represent the best fit allowing the free choice of both parameters in Equation (2). Dotted lines show the curve fits obtained after fixing the shape and allowing only the constant term to vary.

View larger version (14K): [in a new window]   Figure 2. Plot of the half value layer (HVL) against tube voltage for the molybdenum target/filter combination (Mo/Mo). The three sets of data represent the following sets of conditions: , 36.1 µm Mo, 1.75 mm Perspex; , 25 µm Mo, 1 mm Perspex; , 45 µm Mo, 3 mm Perspex. Solid lines represent the best fit allowing the free choice of all parameters in Equation (3). Dotted lines show the curve fits obtained after fixing the shape and allowing only the constant term to vary.

View larger version (11K): [in a new window]   Figure 3. (a) Predicted values of air kerma plotted against measured values for a range of tube voltages and target/filter combinations. The solid line is the line of equality, y=x. (b) Predicted values of the half value layer (HVL) plotted against measured values for a range of tube voltages and target/filter combinations. The solid line is the line of equality, y=x.