Radiat Oncol J.  2015 Sep;33(3):233-241. 10.3857/roj.2015.33.3.233.

Dosimetric comparison of volumetric modulated arc therapy with robotic stereotactic radiation therapy in hepatocellular carcinoma

• Paik EK
• Kim MS
• Choi CW
• Jang WI
• Lee SH
• Choi SH
• Kim KB
• Lee DH

• KMID: 2316745
• DOI: http://doi.org/10.3857/roj.2015.33.3.233

Abstract

PURPOSE
To compare volumetric modulated arc therapy of RapidArc with robotic stereotactic body radiation therapy (SBRT) of CyberKnife in the planning and delivery of SBRT for hepatocellular carcinoma (HCC) treatment by analyzing dosimetric parameters.
MATERIALS AND METHODS
Two radiation treatment plans were generated for 29 HCC patients, one using Eclipse for the RapidArc plan and the other using Multiplan for the CyberKnife plan. The prescription dose was 60 Gy in 3 fractions. The dosimetric parameters of planning target volume (PTV) coverage and normal tissue sparing in the RapidArc and the CyberKnife plans were analyzed.
RESULTS
The conformity index was 1.05 +/- 0.02 for the CyberKnife plan, and 1.13 +/- 0.10 for the RapidArc plan. The homogeneity index was 1.23 +/- 0.01 for the CyberKnife plan, and 1.10 +/- 0.03 for the RapidArc plan. For the normal liver, there were significant differences between the two plans in the low-dose regions of V1 and V3. The normalized volumes of V60 for the normal liver in the RapidArc plan were drastically increased when the mean dose of the PTVs in RapidArc plan is equivalent to the mean dose of the PTVs in the CyberKnife plan.
CONCLUSION
CyberKnife plans show greater dose conformity, especially in small-sized tumors, while RapidArc plans show good dosimetric distribution of low dose sparing in the normal liver and body.

Keyword

Radiosurgery; Hepatocellular carcinoma; Volumetric modulated arc therapy; Robotic radiosurgery

MeSH Terms

Carcinoma, Hepatocellular*
Humans
Liver
Prescriptions
Radiosurgery
Radiotherapy, Intensity-Modulated*