The use of carbon fibre material in radiographic cassettes: estimation of the dose and contrast advantages

The British Journal of Radiology
D R DanceJ Persliden

Abstract

A Monte Carlo simulation has been used to estimate the dose and contrast advantages of replacing radiographic cassette fronts fabricated from aluminium with cassette fronts fabricated from low atomic number material (carbon fibre). The simulation used a realistic imaging geometry and calculations were made both with and without an anti-scatter grid. Account was taken of the scatter generated in the cassette front and the effect of beam hardening on primary contrast. Dose and contrast were evaluated for a range of cassette front thicknesses and tube potentials (60-150 kV) as well as for four examinations representative of situations with varying amounts of scatter. The results with an anti-scatter grid show a clear dose and contrast advantage in all cases when an aluminium cassette front is replaced with a low attenuation cassette front. The contrast advantage is dependent upon the examination and is generally greater for imaging bony structures than for imaging soft tissue. If a 1.74 mm aluminium cassette front is compared with a 1.1 mm carbon fibre cassette front, then the dose advantages are 16%, 9%, 8% and 6% and the contrast advantages are 10%, 7%, 4% and 5% for the AP paediatric pelvis examination at 60 kV, the anteroposte...Continue Reading

Citations

Apr 10, 2003·The British Journal of Radiology·G McVeyG Alm Carlsson
Jan 12, 2010·Radiation Protection Dosimetry·Mark F Mc Entee, Catherine Kinsella
Mar 10, 1999·Physics in Medicine and Biology·M J TapiovaaraD R Dance

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