PMID: 9533132Apr 9, 1998Paper

The effect of the nasopharyngeal air cavity on x-ray interface doses

Physics in Medicine and Biology
W K KanS T Sham

Abstract

We investigated the impact of air cavities in head and neck cancer patients treated by photon beams based on clinical set-ups. The phantom for investigation was constructed with a cubic air cavity of 4 x 4 x 4 cm3 located at the centre of a 30 x 30 x 16 cm3 solid water slab. The cavity cube was used to resemble an extreme case for the nasal cavity. Apart from measuring the dose profiles and central axis percentage depth dose distribution, the dose values in 0.25 x 0.25 x 0.25 cm3 voxels at regions around the air cavity were obtained by Monte Carlo simulations. A mean dose value was taken over the voxels of interest at each depth for evaluation. Single-field results were added to study parallel opposed field effects. For 10 x 10 cm2 parallel opposed fields at 4, 6 and 8 MV, the mean dose at regions near the lateral interfaces of the cavity cube were decreased by 1 to 2% due to the lack of lateral scatter, while the mean dose near the proximal and distal interfaces was increased by 2 to 4% due to the greater transmission through air. Secondary build-up effects at points immediately beyond the air cavity cube are negligible using field sizes greater than 4 x 4 cm2. For most head and neck treatment, the field sizes are usually 6 x ...Continue Reading

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Citations

Dec 4, 2003·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Marco SchwarzEugène M F Damen
Feb 9, 2000·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·K De VlamynckW De Neve
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Feb 24, 2007·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Myonggeun YoonKwan Ho Cho
May 16, 2006·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Anna L PetoukhovaHans Welleweerd
Apr 19, 2006·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Miltiadis F TsiakalosKiki Theodorou
May 23, 2006·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Sandra CanevaJean-Claude Rosenwald
Dec 20, 2005·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Siarhei SpirydovichPaul Desrosiers
Oct 1, 2003·Physics in Medicine and Biology·Maria M AspradakisAlasdair Steele

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