open access

Vol 8, No 4 (2003)
Original papers
Published online: 2003-01-01
Submitted: 2003-04-22
Get Citation

Dosimetric verification of dynamic wedged fields

Marzena Janiszewska, Grzegorz Nowakowski
DOI: 10.1016/S1507-1367(03)71001-3
·
Rep Pract Oncol Radiother 2003;8(4):139-152.

open access

Vol 8, No 4 (2003)
Original papers
Published online: 2003-01-01
Submitted: 2003-04-22

Abstract

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 planning 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 0.6 ccm and 0.1 ccm.

Results

The results are presented in the form of diagrams and tables. Differences in the calculations of monitor units do not exceed 3%. The differences between the analyzed profile areas averaged out at 2.4%.

Discussion

: The compliances confirmed by measurements corroborate the correctness of the system operation. The measurements became a guideline for the creation of a routine system of dynamic wedge control.

Abstract

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 planning 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 0.6 ccm and 0.1 ccm.

Results

The results are presented in the form of diagrams and tables. Differences in the calculations of monitor units do not exceed 3%. The differences between the analyzed profile areas averaged out at 2.4%.

Discussion

: The compliances confirmed by measurements corroborate the correctness of the system operation. The measurements became a guideline for the creation of a routine system of dynamic wedge control.

Get Citation

Keywords

Dynamic wedge; GSTT (Golden Segmented Treatment Table); profile

About this article
Title

Dosimetric verification of dynamic wedged fields

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 8, No 4 (2003)

Pages

139-152

Published online

2003-01-01

DOI

10.1016/S1507-1367(03)71001-3

Bibliographic record

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

Keywords

Dynamic wedge
GSTT (Golden Segmented Treatment Table)
profile

Authors

Marzena Janiszewska
Grzegorz Nowakowski

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