Volumetric modulated arc therapy [VMAT] builds further on intensity-modulated radiation therapy [IMRT] technology.
VMAT involves the use of external radiation therapy beams being directed in a series of arcs or angles by a rotating machine to allow for greater access to a cancerous tumour. The main advantages of this treatment are its precision and speed.
This therapy reduces the likelihood of impacting healthy surrounding tissues and allows more difficult tumours, such as ones wrapped around other important structures, to be targeted precisely.
VMAT technology allows different variables (e.g. gantry rotation speed, dose rate, MLC position) to be adjusted while the radiation beam is moving. With this, complex dose distributions can be achieved and treatment time is much shorter.
On average, each VMAT treatment is completed in less than two minutes, significantly shorter than conventional radiation treatments. Shorter treatment times improves the accuracy of radiation delivery while also improving the patient’s convenience and quality of life.
The VMAT technique is utilised in head and neck cancers, prostate cancers, and tumour sites where radiation therapy needs to be delivered to larger areas while sparing surrounding healthy organs. This treatment is especially suitable for patients who have difficulty remaining in the treatment position for prolonged periods of time due to the short treatment duration.
Image-guided radiation therapy [IGRT] is a radiation therapy which utilises advanced imaging equipment and computer software to accurately target tumours. This minimises the impact on surrounding healthy tissues, resulting in fewer potential side effects from treatment.
Brachytherapy is a special form of internal radiation therapy where a radioactive source is placed close to or inside the tumour.
Senior Consultant Radiation Oncologist, Medical Director, MBBS (Aust), FRANZCR (Radiation Oncology)
Dr Tang obtained his medical degree from the University of Newcastle, Australia in 1998 and completed his house officer training at the Hunter Area Health Service, Australia before returning to Singapore to start his specialty training in Radiation Oncology at the National University Hospital (NUH). After obtaining his fellowship from the Royal Australian College of Radiologist (FRANZCR) in 2006, Dr Tang underwent fellowships in breast brachytherapy at University of Wisconsin and Arizona Breast Cancer Specialist Centre as well as prostate brachytherapy, skin and paediatric fellowships at Peter Maccallum Cancer Institute, Australia.
Dr. Johann Tang is an experienced radiation oncologist who aims to deliver the highest level of care to his patients. e is dedicated to understanding each patient’s condition and provides holistic customized care that is both effective and compassionate. With ethics and empathy held at the core of our practice, we strive to understand your individual needs and provide care that is compassionate and responsive.
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