Dose calculation and dosimetry tests for clinical implementation of 1D tissue-deficit compensation by a single dynamic absorber

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
D CorlettoR Calandrino

Abstract

In this study the possibilities for implementing 1D tissue-deficit compensation techniques by a dynamic single absorber were investigated. This research firstly involved a preliminary examination on the accuracy of a pencil beam-based algorithm, implemented for irregularly shaped photon beams in our 3D treatment planning system (TPS) (Cadplan 2.7, Varian-Dosetek Oy), in calculating dose distributions delivered in ID non-uniform fields. Once the reliability of the pencil beam (PB) algorithm for dose calculations in non-uniform beams was verified, we proceeded to test the feasibility of tissue-deficit compensation using our single absorber modulator. As an example, we considered a mantle field technique. To evaluate the accuracy of the method employed in calculating dose distributions delivered in 1D non-uniform fields, three different fluence profiles, which could be considered as a small sample representative of clinically relevant applications, were selected. The incident non-uniform fluences were simulated by the sum of simple blocked fields (i.e. with rectangular 'strip' blocks, one per beam) properly weighed by the 'modulation factors' Fi, defined in each interval of the subdivided profile as the ratio between the desired f...Continue Reading

References

Aug 1, 1988·International Journal of Radiation Oncology, Biology, Physics·R MohanZ Fuks
Jun 1, 1988·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·A Brahme
May 1, 1982·Medical Physics·A L Boyer
Dec 1, 1993·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·C FiorinoR Calandrino
Feb 1, 1994·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·C WeltensE van der Schueren
May 20, 1993·International Journal of Radiation Oncology, Biology, Physics·J Van DykP C Shragge
Jan 1, 2000·Physics in Medicine and Biology·P R StorchiE Woudstra

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Citations

May 2, 2000·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·C FiorinoR Calandrino
Mar 22, 2003·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Daniela CorlettoClaudio Fiorino
Dec 10, 1999·Physics in Medicine and Biology·D CorlettoF Rudello

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