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Volume 8, Number 4, 2003

Dosimetric verification of dynamic wedged fields

Janiszewska M, Nowakowski G.


Purpose: Verification of dynamic wedge algorithm generation in the Clinac 2100 CD accelerator, and in the Cad Plan- Treatment Planing System.
Material: In order to calculate the dose distribution for dynamic wedge modified fields, the Cad Plan planning system uses an algorithm which is a combination of measurement results for open fields
and the GSTT files. No additional measurement data are required from the user.
Method: To this end, measurements verifying the calculations of monitor units realized by the pla-nning system for dynamically modified fields were conducted. The following profiles were compared: the measured profile and the profile generated by the Varian system. The measurements were carried out for the energy of 6 MeV, for EDW 15, 20, 30 and 45, using a water phantom and ionization chambers with active volumes of 0.6ccm and 0.1ccm.
Results: The results are presented in the form of diagrams and tables. Differences in the calcu-lations of monitor units do not exceed 3%. The differences between the analyzed profile areas ave-raged out at 2.4%.
Discussion: The compliances confirmed by measurements corroborate the correctness of the sys-tem operation. The measurements became a guideline for the creation of a routine system of dynamic wedge control.

Signature: Rep Pract Oncol Radiother, 2003; 8(4) : 139-152


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