Stereotactic radiation therapy (SRT) is also referred to as stereotactic body radiation therapy (SBRT) or stereotactic ablative radiation therapy (SABR). It is an advanced technique used to treat small, well-defined tumours or high-risk postoperative areas. It can be used to treat both primary and metastatic (sometimes referred to as secondary) tumours. These are tumours that have spread from other organs in the body to cancers in the brain, spine, bones, liver and lung.
The specialised technology allows a multiple, highly precise radiation beams to deliver a high dose of radiation to the tumour very accurately to a small target. This is made possible by the use of 3D treatment planning with advanced imaging technology (e.g. CT scans, PET, MRT) to localize the tumour accurately in four dimensions.
With the ability to treat with sub-millimetre accuracy, there is a steep dose gradient outside the tumour and the surrounding healthy tissue is not affected in a manner that is not achievable by conventional radiation therapy.
Due to the larger daily doses of radiation delivered to patients with stereotactic radiation therapy, treatments can be completed within a single treatment, or multiple treatments spanning over 2-10 days. Each daily treatment usually takes no longer than 20 minutes. This treatment can be done on an outpatient basis and normal activities can be resumed thereafter.
Volumetric modulated arc therapy [VMAT] involves the use of external radiation therapy beams being directed in a series of arcs or angles to allow for greater access to tumour. VMAT allows more difficult tumours, such as ones wrapped around other important structures, to be targeted precisely.
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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