open access

Vol 3, No 4 (1998)
Original papers
Published online: 1998-01-01
Submitted: 1998-10-20
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Comparison of calculation accuracy of the cadplan and alfard radiotherapy computer planning systems in Co – 60 teletherapy

A. Rembielak, K. Ślosarek, A. Grządziel
DOI: 10.1016/S1507-1367(98)70171-3
·
Rep Pract Oncol Radiother 1998;3(4):75-80.

open access

Vol 3, No 4 (1998)
Original papers
Published online: 1998-01-01
Submitted: 1998-10-20

Abstract

Purpose

The purpose of this work was to determine the agreement of the measured and calculated values of the isodose distance (depth) along the central axis and penumbra.

Materials and methods

Isodose distributions were measured with an ionization chamber in a water phantom. Photon beams were generated by a Co60 teletherapy unit. Beam data were transferred to the treatment planning systems.

The analysis was performed for open or 30, 45, 60 degree wedged fields, field sizes of 6 × 6 cm, 10 × 10 cm, 14 × 14 cm and SSD = 80 cm. The relative errors between the measured values and the calculated values by CADPLAN 2.7 and calculated by ALFARD were evaluated.

Results

In the case of open fields, the relative error of the calculated isodose depth along the central axis is comparable for both systems, whereas for wedged fields the relative error is smaller in CADPLAN calculations. Generally, both systems underestimate the calculated values as compared with those measured. The penumbra values are smaller for the CADPLAN system than those for the ALFARD.

Conclusion

Quantification of calculation accuracy constitutes an essential part of the verification of radiotherapy planning systems.

Abstract

Purpose

The purpose of this work was to determine the agreement of the measured and calculated values of the isodose distance (depth) along the central axis and penumbra.

Materials and methods

Isodose distributions were measured with an ionization chamber in a water phantom. Photon beams were generated by a Co60 teletherapy unit. Beam data were transferred to the treatment planning systems.

The analysis was performed for open or 30, 45, 60 degree wedged fields, field sizes of 6 × 6 cm, 10 × 10 cm, 14 × 14 cm and SSD = 80 cm. The relative errors between the measured values and the calculated values by CADPLAN 2.7 and calculated by ALFARD were evaluated.

Results

In the case of open fields, the relative error of the calculated isodose depth along the central axis is comparable for both systems, whereas for wedged fields the relative error is smaller in CADPLAN calculations. Generally, both systems underestimate the calculated values as compared with those measured. The penumbra values are smaller for the CADPLAN system than those for the ALFARD.

Conclusion

Quantification of calculation accuracy constitutes an essential part of the verification of radiotherapy planning systems.

Get Citation

Keywords

radiotherapy; treatment planning system; calculation accuracy

About this article
Title

Comparison of calculation accuracy of the cadplan and alfard radiotherapy computer planning systems in Co – 60 teletherapy

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 3, No 4 (1998)

Pages

75-80

Published online

1998-01-01

DOI

10.1016/S1507-1367(98)70171-3

Bibliographic record

Rep Pract Oncol Radiother 1998;3(4):75-80.

Keywords

radiotherapy
treatment planning system
calculation accuracy

Authors

A. Rembielak
K. Ślosarek
A. Grządziel

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