Dosimetric evaluation of a three-dimensional treatment planning system

Appasamy Murugan; Xavier Sidonia Valas; Kuppusamy Thayalan; Velayudham Ramasubramanian

doi:10.4103/0971-6203.75467

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ORIGINAL ARTICLE

Year : 2011 | Volume : 36 | Issue : 1 | Page : 15-21

Dosimetric evaluation of a three-dimensional treatment planning system

Appasamy Murugan¹, Xavier Sidonia Valas², Kuppusamy Thayalan², Velayudham Ramasubramanian³
¹ Medical Physics Division, Dr. Kamakshi Memorial Hospital, No:1, Radial Road, Pallikaranai, Chennai - 600 100, Tamil Nadu; Nuclear and Medical Physics Division, School of Advanced Sciences, VIT University, Vellore - 632 014, Tamil Nadu, India
² Medical Physics Division, Dr. Kamakshi Memorial Hospital, No:1, Radial Road, Pallikaranai, Chennai - 600 100, Tamil Nadu, India
³ Nuclear and Medical Physics Division, School of Advanced Sciences, VIT University, Vellore - 632 014, Tamil Nadu, India

Correspondence Address:
Appasamy Murugan
Medical Physics Division, Dr. Kamakshi Memorial Hospital, No:1, Radial Road, Pallikaranai, Chennai - 600 100. Tamil Nadu
India

Source of Support: None, Conflict of Interest: None

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DOI: 10.4103/0971-6203.75467

The computerized treatment planning system plays a major role in radiation therapy in delivering correct radiation dose to the patients within ±5% as recommended by the ICRU. To evaluate the dosimetric performance of the Treatment Planning system (TPS) with three-dimensional dose calculation algorithm using the basic beam data measured for 6 MV X-rays. Eleven numbers of test cases were created according to the Technical Report Series-430 (TRS 430) and are used to evaluate the TPS in a homogeneous water phantom. These cases involve simple field arrangements as well as the presence of a low-density material in the beam to resemble an air in-homogeneity. Absolute dose measurements were performed for the each case with the MU calculation given by the TPS, and the measured dose is compared with the corresponding TPS calculated dose values. The result yields a percentage difference maximum of 2.38% for all simple test cases. For complex test cases in the presence of in-homogeneity, beam modifiers or beam modifiers with asymmetric fields a maximum percentage difference of 5.94% was observed. This study ensures that the dosimetric calculations performed by the TPS are within the accuracy of ±5% which is very much warranted in patient dose delivery. The test procedures are simple, not only during the installation of TPS, but also repeated at periodic intervals.

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