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Investigation of optimum energies for chest imaging using film–screen and computed radiography

Kings Centre for the Assessment of Radiological Equipment (KCARE), Kings College Hospital, London SE5 9RS, UK

View larger version (12K): [in a new window]   Figure 1. The mass attenuation coefficients of Gd2O2S (thin solid line) and BaFB0.85I0.15 (thick solid line) as a function of energy [10].

View larger version (12K): [in a new window]   Figure 2. The fraction of photons interacting with a BaF(Br0.85I0.15) computed radiography (CR) plate (solid line) and a Gd2O2S phosphor screen (dashed line). The values were calculated using Equation 1, and published tables of data [9, 10]. Both curves have been normalized to their peak point.

View larger version (17K): [in a new window]   Figure 3. A schematic diagram of the experimental setup used.

View larger version (11K): [in a new window]   Figure 4. Plot of visibility index (VI) versus effective dose for sets of computed radiography (CR) images obtained at 75 kVp (thick solid line with data points marked by horizontal lines), 90 kVp (dashed line with data points marked by crosses) and 125 kVp (thin solid line with data points marked by diamond shapes).

View larger version (13K): [in a new window]   Figure 5. Plot of visibility index (VI) versus effective dose for sets of film–screen (FS) images obtained at 75 kVp (thick solid line with data points marked by horizontal lines), 90 kVp (dashed line with data points marked by crosses) and 125 kVp (thin solid line with data points marked by diamond shapes).

View larger version (11K): [in a new window]   Figure 6. A plot of the ratio of film–screen (FS) visibility index (VI) trend-line to the computed radiography (CR) VI trend-line at 75 kVp (thick solid line), 90 kVp (dashed line) and 125 kVp (thin solid line).