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- W2066756875 abstract "A novel method of designing intensity modulated beams (IMBs) to achieve compensation in external beam radiotherapy of the breast, without the need for CT scans, is presented. The design method comprises three parts: (1) an electronic portal image is used to generate a map of radiological thickness; (2) this map is then used to obtain an estimate of the breast and lung outline; (3) a TMR-based dose calculation algorithm is then used to determine the optimum beam profile to achieve the best dose distribution. The dose distributions calculated for IMBs were compared with those calculated for the use of simple wedges. The results for two patients studied indicate that the dose inhomogeneity for IMBs is ±5%, compared with a value of ±10% for a wedged plan. The uncertainty in radiological thickness measurement corresponds to a dosimetric error of ±2%. Other errors associated with outline estimation are typically less than 2%, with a largest value of +5% for one of the patients who had a large and highly asymmetrical breast. The results for the two patients studied suggest that the uncertainties in the method are significantly smaller than the improvement in dose uniformity produced." @default.
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- W2066756875 date "1995-10-01" @default.
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- W2066756875 title "Design of compensators for breast radiotherapy using electronic portal imaging" @default.
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- W2066756875 doi "https://doi.org/10.1016/0167-8140(95)01617-p" @default.
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