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Absorbed dose behind eye shields during kilovoltage photon radiotherapy

C R Baker, PhD, F Luhana, MSc and S J Thomas, MA, MSc

Medical Physics Department, Box 152, Addenbrooke's NHS Trust, Hills Road, Cambridge CB2 2QQ, UK



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  		Figure 1. Beam geometries for the derivation of predicted dose. Du is the prescribed dose for a field of diameter f containing a shield of diameter s. D0 is the dose at the centre of the field in the absence of the shield, and Ds is the dose beneath the shield. (a) The simple case of a centrally located shield and (b) the extreme case of shielding at the field periphery.

 


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  		Figure 2. Measurement geometry (not to scale). The arrangement for determination of primary beam transmission is shown on the left. The set-up for measurement of dose behind the eye shields is shown on the right. The 3 cm and 5 cm diameter applicators had a source-to-skin distance (SSD) of 30 cm, and the 10 x 10 cm2 and 20 x 20 cm2 applicators had a SSD of 50 cm. Stand-off was 4 cm for the 30 cm SSD and 7 cm for the 50 cm SSD applicators.

 




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