Dosimetric and Treatment Delivery Efficiency Comparison of Two Ring-gantry Linear Accelerator Platforms for Liver Stereotactic Body Radiotherapy
Abstract
Purpose: The purpose of this study was to compare the dosimetric performance and treatment delivery efficiency of two ring-gantry linear accelerator platforms, Helical Tomotherapy and Halcyon, in stereotactic body radiation therapy (SBRT) for liver metastasis. Materials and Methods: A retrospective dosimetric analysis was conducted on 16 patients with solitary liver metastasis. For each patient, SBRT plans were generated using the Accuray treatment planning system (TPS) (Tomotherapy) and Eclipse TPS (Halcyon). Plan evaluation included conformity, homogeneity, and gradient indices, along with target coverage and organs at risk (OAR) dose–volume parameters, in accordance with Radiation Therapy Oncology Group-1112 (RTOG-1112) guidelines. Treatment efficiency was assessed using monitor units (MU) and beam-on time (BOT). Statistical analysis was performed using paired t-tests (SPSS v28.0), with P < 0.05 considered statistically significant. Results: Both platforms achieved acceptable target coverage and OAR constraints. Conformity index and gradient index were comparable. Halcyon showed improved planning target volume homogeneity, lower normal liver V15 Gy, reduced OAR doses, and significantly lower MU and BOT (P < 0.05), indicating superior treatment efficiency. Conclusion: Both Tomotherapy and Halcyon are capable of generating high-quality liver SBRT plans with comparable target coverage. However, Halcyon demonstrated improved normal tissue sparing and enhanced treatment efficiency.
Related
- Dosimetric Comparison of Intensity-Modulated Radiotherapy and Four-Field Three-Dimensional Conformal Radiotherapy in the Management of Prostate Cancer: A Retrospective Dual-Centre Analysis
- Dosimetric feasibility of lattice radiotherapy for bulky tumors: a paired VMAT vs. helical tomotherapy comparison - the STRYKE trial
- Updated dosimetric comparison of HDR interventional radiotherapy including ⁶⁰Co sources versus VMAT and electron beam therapy for NMSC.
- Dosimetric Comparison of One-, Two-, Three-, and Four-Arc Volumetric Modulated Arc Therapy Plans in Cervical Carcinoma: Evaluation of Plan Quality, Organ-at-Risk Sparing, and Treatment Efficiency.
- Dosimetric impact of baseline shift plan in a magnetic resonance linear accelerator according to target motion and plan characteristics.
BibTeX
@article{guduru2026dosimetric,
title = {{Dosimetric and Treatment Delivery Efficiency Comparison of Two Ring-gantry Linear Accelerator Platforms for Liver Stereotactic Body Radiotherapy}},
author = {Srikanth Guduru and Rohith Singareddy and N. V. N. Madhusudhana Sresty and Deleep Kumar Gudipudi and Aparna Dode},
journal = {Journal of Medical Physics},
year = {2026},
month = jul,
doi = {10.4103/jmp.jmp_91_26},
url = {https://doi.org/10.4103/jmp.jmp_91_26},
note = {CC BY-NC-SA},
}
RIS
TY - JOUR
TI - Dosimetric and Treatment Delivery Efficiency Comparison of Two Ring-gantry Linear Accelerator Platforms for Liver Stereotactic Body Radiotherapy
AU - Srikanth Guduru
AU - Rohith Singareddy
AU - N. V. N. Madhusudhana Sresty
AU - Deleep Kumar Gudipudi
AU - Aparna Dode
PY - 2026
DA - 2026/07/01
JO - Journal of Medical Physics
DO - 10.4103/jmp.jmp_91_26
UR - https://doi.org/10.4103/jmp.jmp_91_26
AB - Purpose: The purpose of this study was to compare the dosimetric performance and treatment delivery efficiency of two ring-gantry linear accelerator platforms, Helical Tomotherapy and Halcyon, in stereotactic body radiation therapy (SBRT) for liver metastasis. Materials and Methods: A retrospective dosimetric analysis was conducted on 16 patients with solitary liver metastasis. For each patient, SBRT plans were generated using the Accuray treatment planning system (TPS) (Tomotherapy) and Eclipse TPS (Halcyon). Plan evaluation included conformity, homogeneity, and gradient indices, along with target coverage and organs at risk (OAR) dose–volume parameters, in accordance with Radiation Therapy Oncology Group-1112 (RTOG-1112) guidelines. Treatment efficiency was assessed using monitor units (MU) and beam-on time (BOT). Statistical analysis was performed using paired t-tests (SPSS v28.0), with P < 0.05 considered statistically significant. Results: Both platforms achieved acceptable target coverage and OAR constraints. Conformity index and gradient index were comparable. Halcyon showed improved planning target volume homogeneity, lower normal liver V15 Gy, reduced OAR doses, and significantly lower MU and BOT (P < 0.05), indicating superior treatment efficiency. Conclusion: Both Tomotherapy and Halcyon are capable of generating high-quality liver SBRT plans with comparable target coverage. However, Halcyon demonstrated improved normal tissue sparing and enhanced treatment efficiency.
SN - 0971-6203
SN - 1998-3913
ER -