PMID: 8985048Dec 1, 1996Paper

Evaluation of dose calculation algorithm of the peacock system for multileaf intensity modulation collimator

International Journal of Radiation Oncology, Biology, Physics
A WuS Kalnicki

Abstract

To evaluate the dose calculation algorithm used in the inverse treatment planning computer system for the intensity modulation multileaf collimator. The inverse treatment-planning computer system calculates the intensities of multiple pencil beams to achieve an optimal distribution and modulates the beam intensity through the special multileaf collimator. The system's dose calculation algorithm made the two basic assumptions: (a) The tissue-maximum ratios (TMRs) of a single pencil beam have the same values as TMRs for raylines through each pencil beam that are determined from percentage depth dose isodose curves along the long axis of the 2 x 20 cm2 field with all leaves open; and (b) the relative output factors (ROF) of each pencil beam also have the same values as the rayline TMR at d(max) of the 2 x 20 cm2 field. To verify these two assumptions, a special multileaf collimator was installed to our linear accelerator which produces 4 MV x-rays. The TMRs and ROFs for the single leaves 1 through 10 were measured using an ion chamber and TLD dosimeter in either a water or a polystyrene phantom. The values of rayline TMRs were calculated from the measured crossplane isodose curves of the 2 x 20 cm2 field. Comparisons were made bet...Continue Reading

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Citations

Mar 13, 1999·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·D A LowJ A Purdy
Feb 5, 2000·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·D Verellen, F Vanhavere
Sep 7, 2000·International Journal of Radiation Oncology, Biology, Physics·M D PosnerL J Verhey
Aug 1, 1997·International Journal of Radiation Oncology, Biology, Physics·D VerellenG Storme
Apr 16, 1998·International Journal of Radiation Oncology, Biology, Physics·J S TsaiM J Engler
Jul 4, 1998·International Journal of Radiation Oncology, Biology, Physics·D A Low, S Mutic
Sep 25, 1998·International Journal of Radiation Oncology, Biology, Physics·S Mutic, D A Low
Nov 7, 1998·International Journal of Radiation Oncology, Biology, Physics·D A LowJ A Purdy
Sep 7, 1999·International Journal of Radiation Oncology, Biology, Physics·D A LowJ A Purdy
Apr 12, 2000·International Journal of Radiation Oncology, Biology, Physics·N DoganB Emami
Jul 8, 2000·The British Journal of Radiology·C NuttingS Webb
Jul 4, 2002·Medical Physics·Sha X ChangJoel E Tepper
May 8, 1999·Physics in Medicine and Biology·M H PhillipsA R Hounsell
Jul 1, 1997·Physics in Medicine and Biology·D A Low, S Mutic

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