Dosimetric Evaluation of Various Radiation Therapy Treatment Techniques for Carcinoma Esophagus: A Treatment Planning Study
Dinesh Kumar SAROJ1,Gopa GHOSH3,Shuchishree SHUKLA3,Suresh YADAV4,Neetu PALİWAL2
1Department of Radiotherapy, Alexis Multispecialty Hospital, Nagpur-India
2Department of Physics, Rabindranath Tagore University, Bhopal-India
3Department of Radiotherapy, Chirayu Medical College and Hospital, Bhopal-India
4Department of Radiotherapy, Gandhi Medical College, Bhopal-India
DOI : 10.5505/tjo.2022.3659 OBJECTIVE
The study was conducted to compare the dosimetric superiority between the three-dimensional conformal radiation therapy (3DCRT), intensity-modulated radiation therapy (IMRT) and Rapid Arc in terms of treatment plan quality.

We have taken 15 Patients of ca-esophagus for our study from our hospital database. Patients were already treated 3DCRT plan. Retrospectively additional IMRT and RA plans were created with Planning target volume (PTV) prescription dose of 50.4Gy in 28 fractions. Prescription dose of 95% of PTV was chosen for the comparison between three treatment planning strategies. Dose volume histogram was used to analyze and compare various plan quality index and doses to the organs at risk (OARs).

The D95% of PTV for 3DCRT plan was 47.85±0.78 Gy, which significantly got improved in IMRT (48.75±0.86 Gy) and RA (49.0±0.64 Gy) plans. The CI value for PTV coverage in 3DCRT was 0.96±0.04; however, the CI values in IMRT and RA plans were significant at 0.98±0.01 and 0.98±0.03, respectively. The 3DCRT plan had an HI of 1.09±0.03, which was significantly raised to 1.046±0.26 in the IMRT plan (p=0.01) and 1.06±0.02 in the RA plan (p=0.03).

An IMRT and RA plan gives greater conformity of dose to the PTV in comparison to 3DCRT. Lesser doses to the surrounding OARs are the major importance of the IMRT and RA planning technique. Dose escalation is possible with IMRT and RA plans. Keywords : Ca-esophagus; intensity-modulated radiation therap; plan quality index; RA; three-dimensional conformal radiation therapy