Heavy Ion Radiotherapy at QST Hospital: Principles and Indications
Medical Supporter — Information Notice
This article is a summary of international medical information and is not medical advice; it cannot replace the diagnosis or treatment plan of your attending physician. The medical technologies, drug information and clinical data presented here are compiled from public literature and official statements of Japanese medical institutions; the applicability and outcome of any therapy vary with each patient and must be assessed individually by a qualified physician.
Heavy ion (Heavy Particle) beam therapy is a form of radiation therapy. This therapy utilizes charged particles, such as carbon or neon ions, accelerated to over 70% of the speed of light using a medical synchrotron to irradiate tumor lesions.
Physical and Biological Properties of Heavy Ion Beams
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Physical Precision (Bragg Peak): Traditional X-rays are strongest upon entering the body's surface and gradually weaken as they penetrate. In contrast, heavy ion beams possess the "Bragg Peak" characteristic, allowing them to concentrate energy at a planned depth. This property is used in treatment planning; surrounding healthy tissue can still be affected.
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Biological Effects: Ionizing radiation can damage DNA. Carbon ions can produce complex DNA damage; biological effects vary with the beam, dose and tissue. These properties do not guarantee tumor control or the absence of adverse effects.
Heavy Ion Therapy at QST Hospital
QST Hospital (National Institutes for Quantum Science and Technology) houses the world's first dedicated heavy ion medical facility, "HIMAC."
- Extensive Experience: As of 2019, the hospital has completed over 15,000 actual treatments.
- Advanced Irradiation Technology: The facility features "Respiratory Gated Irradiation," "3D Beam Scanning," and "Rotating Gantry Irradiation" technologies, used in planning and delivering treatment.
- Comprehensive Facilities: With 100 beds and a professional radiological medical team, the hospital provides medical care; individual eligibility must be confirmed.
Applicable Conditions
Conditions discussed in heavy ion therapy research and practice include the following. Suitability requires individual clinical assessment:
- Head and neck tumors, including skull base tumors
- Lung cancer (specifically non-small cell lung cancer)
- Liver, pancreatic, and renal cancers
- Osteosarcoma and chondrosarcoma
- Prostate cancer
- Post-surgical recurrence of colorectal cancer
The Treatment Process
Each heavy ion treatment session lasts approximately 2 to 5 minutes and is performed once daily. The number of sessions and possible adverse effects depend on the treatment plan.
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