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The effect of phantom type, beam quality, field size and field position on X-ray scattering simulated using Monte Carlo techniques

Joint Department of Physics, The Royal Marsden NHS Trust, Fulham Road, London SW3 6JJ, UK

View larger version (28K): [in a new window]   Figure 1. The simulation model used to calculate the scatter from a patient undergoing, for example, a chest posteroanterior X-ray examination. The position of the detector is shown at a scattering angle of 135°. The three other phantoms used in the calculations are also shown below.

View larger version (25K): [in a new window]   Figure 2. The variation of the percentage scatter with different phantom types(P1 to P4) for (a) the chest posteroanterior projection, (b) the lumbar spine anteroposterior projection and (c) the lumbar spine lateral projection.

View larger version (13K): [in a new window]   Figure 3. The variation of the normalized percentage scatter at a 45° scattering angle with square, rectangular and equivalent square field sizes between 25 cm2 and 900 cm2 for (a) the lumbar spine anteroposterior projection and (b) the chest posteroanterior projection.