Abstract:
Objective To research the structure and principle of Helical Tomotherapy, and study the clinical application value of the equipment system. Methods As the first helical radiotherapy system in the mainland of China, its constructions, structure and principle were analyzed and discussed. Results Helical Tomotherapy is a new kind of radiotherapy equipment. The Hi-Art treatment system is a combination of a LINAC and a CT scanner capable of having the function of both systems. It was approved to achieve the best intensity modulated radiation therapy (IMRT), used for adjusting the setup position of the patient with MVCT and as the basis for dose reconstruction and other adaptive radiotherapy processes. It is the first integrated planning, delivery and verification system for IMRT. Conclusion Image-guided radiation therapy (IGRT) and IMRT have introduced a new era in radiation oncology which will better fight cancer and simultaneously improve the patients' quality of life. Having been designed from the ground up for IGRT and IMRT, the tomotherapy system is in the forefront of technical advancements for efficacy and processes to make it efficiently.Keywords:
Tomotherapy
Image-guided radiation therapy
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A Karger 'Publishing Highlights 1890–2015' title New high-precision technologies for the planning and delivery of radiotherapy are major advances in cancer treatment. This volume is a comprehensive guidebook to these new technologies and the many clinical treatment programs that bring them into practical use. Advances in intensity modulated radiation therapy (IMRT), 4D and adaptive treatment planning are clearly explained, and the new target localization and image-guided radiotherapy (IGRT) systems are comprehensively reviewed. Clinical tutorials fully illustrate the target definitions for the major cancer sites, and techniques for organ motion management are shown. In addition, chapters explore the technical basis for stereotactic body radiotherapy (SBRT) and the latest clinical experience with it for most organ sites. In this volume, foremost authorities explain the important new techniques and technologies of radiation oncology, and give essential treatment guidelines for its clinical and technical practitioners.
Tomotherapy
Image-guided radiation therapy
Radiation oncology
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Helical tomotherapy using the Hi‐ART II is analogous to helical CT imaging where the gantry and the couch are in simultaneous motion. Hence, beam delivery is continuous over all 360 in transverse planes about the patient. Temporal beam modulation is achieved by using a binary multi‐leaf collimator. In addition to its ability to deliver IMRT, the Hi‐ART II has the ability to obtain helical megavoltage CT (MVCT) images. These MVCT images have adequate spatial and contrast resolution for image guidance, and also for identification of many soft‐tissue structures. The incorporation of daily three dimensional soft‐tissue imaging into the radiotherapy process also enables dose recalculation and periodic evaluation of the treatment delivery during a course of radiotherapy. Hence, the subsequent treatment delivery can be modified using a systematic feedback of the geometric and dosimetric information in the previous fractions. This requires many components as feedback, including CT guidance to achieve soft tissue localization, dose recalculation, dose accumulation, treatment evaluation, re‐contouring, and re‐optimization. This lecture will provide an overview of the physical characteristics of the Hi‐ART II, acceptance testing and commissioning, image quality tests, image registration, basic quality assurance, and an overview of clinical applications. Finally, system limitations and future developments will be addressed. Educational Objectives 1. Understand the basics concepts of helical tomotherapy. 2. Understand the basic QA requirements and system limitations association with helical tomotherapy. 3. Understand the workflow and issues related to clinical applications of helical tomotherapy, including acquisition, reconstruction, registration and patient alignment. 4. Understand the possibilities of daily soft‐tissue imaging for patient alignment and evaluation of treatment accuracy.
Tomotherapy
Collimator
Image registration
Image-guided radiation therapy
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Pre-treatment cone beam CT image guidance combined with linear accelerator based intensity-modulated radiotherapy (IMRT) is compared to and contrasted with tomotherapy an alternative commercially available IMRT planning and delivery system. The underlying rationale of the two different IMRT approaches are discussed and their methods pre-treatment image guidance and modes of treatment delivery are described. Differences between dose-distributions delivered using tomotherapy and conventional linear accelerators are outlined. Because conventional linear accelerator design has been refined over many decades, innovative design enhancement of one aspect of system performance often limits another facet of system capability. Consequently the two IGRT/IMRT delivery systems may prove optimal for different types of treatment, proving advantageous for certain disease sites while being of almost equal utility in others. Educational Objectives: 1. Understand the differences and similarities in pre-treatment image guidance for the two systems discussed. 2. Understand the differences and similarities in treatment delivery for the two systems discussed.
Tomotherapy
Image-guided radiation therapy
Cone-Beam CT
Delivery system
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Objective To evaluate and analyze the advantages of the helical tomotherapy system from the medical engineering point, providing decision-makers the technical reference who were ready to introduce this radiation therapy system into hospital.Materials and Methods According to the current published professional paper and the development of CT technology industry,evaluates the advantages of IGRT,IMRT and DGRT in the helical tomotherapy system one by one.Then analyzes the development in future. Results and Discussion IGRT could be achieved everyday for every patient with a low dose helical fan beam MVCT guidance which could help the system users to realize accurate patient set-up.IMRT could be achieved with high 3D conformal dose distribution.DGRT function implementation on a real-time dose verification,as well as using the results based on real-time dose reconstruction to calculate the cumulative dose distribution in patients.According to the cumulative dose distribution,physicians and physicists could decide whether to change the treatment plan in order to get high-quality result in the next factions.In system efficiency and motion correction,the helical tomotherapy system had more room for development.Conclusion Helical tomotherapy system is a radiation therapy equipment specially designed for IGRT-IMRT system.It is a perfect harmony of CT and accelerators with implementation of helical tomotherapy.It has realized the true meaning DGRT adaptive radiotherapy.It represents one direction of the precision radiation therapy equipment development which can maximize killing the tumor cell as well as maximize protect the normal tissue.
Tomotherapy
Image-guided radiation therapy
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A clinical helical tomotherapy treatment machine has been installed at the University of Wisconsin Comprehensive Cancer Center. Beam alignment has been finalized and accepted by UW staff. Helical tomotherapy will soon be clinically available to other sites. Clinical physicists who expect to work with this machine will need to be familiar with its unique dosimetric characteristics, and those related to the geometrical beam configuration and its verification are described here. A series of alignment tests and the results are presented. Helical tomotherapy utilizes an array of post‐patient xenon‐filled megavoltage radiation detectors. These detectors have proved capable of performing some alignment verification tests. That is particularly advantageous because those tests can then be automated and easily performed on an ongoing basis.
Tomotherapy
Benchmarking
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Tomotherapy
Margin (machine learning)
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Tomotherapy
Cyberknife
Multileaf collimator
Image-guided radiation therapy
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Citations (8)
Tomotherapy
Multileaf collimator
Collimated light
Collimator
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KylinRay-IMRT is the advanced radiotherapy treatment planning module of accurate radiotherapy system (KylinRay) aiming to provide accurate and efficient plan design platform. In this paper the system design, main functions and key technologies of KylinRay-IMRT were introduced. KylinRay-IMRT supports three dimensional conformal radiotherapy (3D-CRT), intensity modulated radiotherapy (IMRT) and many other types of treatment plan design with function modules including patient data management, image registration and fusion, image contouring, image three dimensional reconstruction and visualization, three dimensional conformal radiotherapy planning, intensity modulated radiotherapy planning, plan evaluation and comparison, and report print. KylinRay-IMRT has been tested by the national standard YY/T 0889-2013, the results showed that the performance of KylinRay-IMRT can fully meet the standard requirements.
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Citations (1)