RT Journal Article SR Electronic T1 Oesophageal Cancer: Conformal Radiotherapy vs. Hybrid-VMAT Technique With Two Different Treatment Planning Systems JF In Vivo JO In Vivo FD International Institute of Anticancer Research SP 331 OP 337 DO 10.21873/invivo.11778 VO 34 IS 1 A1 MIYAZAKI, MASAYOSHI A1 OHIRA, SHINGO A1 UEDA, YOSHIHIRO A1 ISONO, MASARU A1 FUJIWARA, MASAYUKI A1 TANOOKA, MASAO A1 OKADA, WATARU A1 NAKAHARA, RYUTA A1 SUEOKA, MASAKI A1 SUZUKI, HITOMI A1 TESHIMA, TERUKI A1 YAMAKADO, KOICHIRO YR 2020 UL http://iv.iiarjournals.org/content/34/1/331.abstract AB Background/Aim: Traditionally, the radiotherapy of oesophageal cancer has been conformal radiotherapy (CRT). We sought to compare dosimetric parameters of conformal radiotherapy (CRT) with those of two treatment planning systems for hybrid-volumetric modulated arc therapy (h-VMAT) for the treatment of oesophageal cancer. Patients and Methods: In 11 patients, we compared: i) planning target volume coverage, ii) dose to organs at risk, and iii) the dose rate (DR) of the three techniques. We evaluated two treatment planning systems: i) Eclipse and ii) RayStation. Results: The Conformity Index of the CRT plan was significantly higher for the h-VMAT plans, compared to all other parameters. Normal lung tissue volumes receiving >5, 13, or 20 Gy were lower with the RayStation plan compared to Eclipse. The volume of cardiac tissue receiving >40 Gy was highest with the CRT plan. The minimum DR in VMAT was lowest for the RayStation plan (49.5 MU/min). Conclusion: The h-VMAT plan using RayStation is the appropriate choice for reducing lung dose.