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Related Experiment Video

Updated: Sep 6, 2025

Radiation Planning Assistant - A Streamlined, Fully Automated Radiotherapy Treatment Planning System

Radiation Planning Assistant - A Streamlined, Fully Automated Radiotherapy Treatment Planning System

Published on: April 11, 2018

A Novel Method for Improving VMAT Plan Quality and Deliverability.

Natarajan Ramar^1,2, Samir Ranjan Meher²

¹Philips Health Systems, Philips India Ltd, Bangalore, India.

Asian Pacific Journal of Cancer Prevention : APJCP

|June 28, 2022

Summary

A new Volumetric Modulated Arc Therapy (VMAT) method, Augmented Arc (Aug Arc), improves treatment plan quality and delivery. This technique balances single or partial arc efficiency with double arc benefits, optimizing parameters for better outcomes.

Keywords:

Control point IMRT Objective function Partial Arc VMAT

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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Planning

Background:

A novel Volumetric Modulated Arc Therapy (VMAT) technique, termed Augmented Arc (Aug Arc), is introduced.
Aug Arc involves augmenting specific portions of a VMAT arc with an additional arc to enhance treatment plan quality.
The identification of these Aug Arc portions relies on an objective function-based scoring method, the 'ψ - score'.

Purpose of the Study:

To demonstrate the clinical validity and effectiveness of the proposed Augmented Arc (Aug Arc) VMAT method.
To evaluate Aug Arc's performance across diverse clinical scenarios, including Lung, Abdomen, Gynecologic (Gyn), and Pancreas cases.
To assess the impact of Aug Arc on plan quality and deliverability compared to conventional VMAT techniques.

Main Methods:

Four clinical cases (Lung, Abdomen, Gyn, Pancreas) were used to validate the Aug Arc approach.
Different plan configurations were generated: Single Arc (S Arc), Double Arc (D Arc), Partial Arc (P Arc), and Augmented Arc (P+Aug Arc or S+Aug Arc).
The 'ψ - score' was computed using initial optimization with a full arc and 4-degree gantry spacing to identify optimal Aug Arc portions.

Main Results:

The Augmented Arc (Aug Arc) method significantly improved plan quality and deliverability for both central and non-central tumors.
Key improvements included reductions in Organs at Risk (OAR) dose, monitor units (MUs), and beam-on time.
Low dose volume was reduced without compromising target coverage, indicating enhanced treatment precision.

Conclusions:

The proposed Augmented Arc (Aug Arc) approach offers a balanced solution between single/partial arc and full double arc VMAT techniques.
Planners can leverage Aug Arc to identify optimal delivery parameters, achieving a 'sweet spot' for superior plan quality.
This method enhances radiotherapy planning by optimizing efficiency and therapeutic ratio.