[Paper Review] Status and Controls Requirements of the Planned Heavy Ion Tumor Therapy Accelerator Facility HICAT

R. Bär, H. Eickhoff+1 more|ArXiv.org|Nov 9, 2001

Radiation Therapy and Dosimetry1 references3 citations

TL;DR

This paper outlines the status and control system requirements for HICAT, a heavy ion tumor therapy facility under development in Heidelberg, Germany, designed to deliver intensity-modulated proton and carbon ion beams via a linac and compact synchrotron. The system employs pulse-to-pulse beam control using raster-scanning for precise tumor targeting, demanding a highly reliable, industrial-grade control system built with standardized components to ensure patient safety and treatment accuracy.

ABSTRACT

The HICAT project is a Heavy Ion accelerator for light ion Cancer Treatment to be built for the clinics in Heidelberg, Germany. It consists of a 7 MeV/u linac, a compact synchrotron and three treatment places, one of them equipped with a 360 degree gantry beam-line. The facility will implement the intensity controlled raster-scanning technique that was developed and successfully demonstrated at GSI with over 100 patients at present. In order to produce the beams with the characteristics requested by the treatment sequencer, the accelerator must operate on a pulse-to-pulse basis with different settings. This concept imposes strict and challenging demands on the operation of the accelerators and hence the control system of the facility. The control system should be developed, installed and maintained by and under the complete responsibility of an industrial system provider, using a state-of-the-art system and wide-spread industrial components wherever possible. The presentation covers the status of the project and the requirements on the control system.

Motivation & Objective

• To define the control system requirements for the HICAT heavy ion therapy accelerator facility to ensure reliable, real-time beam delivery.
• To support the clinical implementation of intensity-modulated raster-scanning therapy using pulsed beam operation.
• To establish a control system architecture based on industrial standards for maintainability, scalability, and safety.
• To ensure the facility meets the stringent operational demands of clinical radiation therapy with high precision and reproducibility.
• To transfer and adapt successful GSI techniques for clinical use in a new, dedicated treatment facility.

Proposed method

• The facility uses a 7 MeV/u linear accelerator followed by a compact synchrotron to deliver ion beams at variable energies and intensities.
• Beam delivery is controlled on a pulse-to-pulse basis, enabling dynamic adjustment of beam position and intensity for raster-scanning.
• The control system is designed to be developed, installed, and maintained by an industrial provider using widely available, standardized components.
• The system must interface with a treatment sequencer to deliver patient-specific beam patterns with high temporal and spatial accuracy.
• The control architecture is based on state-of-the-art industrial systems to ensure reliability, maintainability, and long-term operability.
• The system integrates feedback and monitoring mechanisms to ensure beam quality and patient safety during treatment delivery.

Experimental results

Research questions

• RQ1 How can a heavy ion accelerator facility be controlled to deliver pulsed, intensity-modulated beams with high precision for clinical therapy?
• RQ2 What control system architecture is required to support real-time, patient-specific beam delivery in a clinical environment?
• RQ3 How can industrial-grade components be used to build a reliable, maintainable, and safe control system for a medical accelerator?
• RQ4 What are the technical challenges in implementing pulse-to-pulse beam control for intensity-modulated scanning in a compact synchrotron setup?
• RQ5 How can the successful GSI raster-scanning technique be adapted and scaled for a new clinical facility?

Key findings

• The HICAT facility requires a pulse-to-pulse beam control system to enable dynamic intensity-modulated raster scanning for precise tumor targeting.
• The control system must be built and managed by an industrial provider using standardized, widely available components to ensure reliability and long-term support.
• The system is designed to handle complex, patient-specific beam patterns with high temporal resolution and accuracy.
• The project builds on the successful clinical implementation of raster-scanning at GSI, now being adapted for a new, dedicated treatment facility.
• The control system architecture is based on industrial standards to ensure maintainability, scalability, and safety in a clinical environment.
• The facility's control system is expected to support three treatment rooms, including one with a 360-degree gantry, requiring high-precision beam delivery.