Stereotactic Radiosurgery (SRS): Radiation treatment of a tumour that is applied in a single fraction or 2-3 fractions with a high dose of Radiation.
Benign brain tumours like arteriovenous malformations (AVM), Acoustic schwannomas, meningiomas, and pituitary adenomas can be treated very effectively with SRS without surgery. Brain metastasis can also be treated successfully with SRS.
SRS for functional radiosurgery: It is widely used in the treatment of Trigeminal neuralgia and intractable epilepsy. A relatively new indication is in the treatment of ventricular tachycardia, which does not respond to medications.
Image-Guided Radiation Therapy (IGRT): Radiation treatment that uses real-time x-ray and CT imaging to deliver precisely focused high-energy Radiation to a tumour.
Three-Dimensional Conformal Radiation Therapy (3D-CRT):
A set of CT images is used to identify both the tumour and the normal tissue structures that need to be avoided. Then, radiation beams of varying shapes are designed to enter the patient from multiple angles and the tumour while avoiding nearby healthy tissues.
Intensity-Modulated Radiation Therapy (IMRT):
It is a high-precision radiotherapy technique and can result in better sparing of normal structures than 3D Conformal radiotherapy. It is possible to vary the doses within the tumour in this technique, maximising radiation to the tumour and maximising radiation to the surrounding normal tissue.
Rapid Arc: It is a more advanced form of IMRT. The treatment delivery is faster and delivers a more conformal dose of radiotherapy, and decreases the normal tissue radiation.
Stereotactic Body Radiation Therapy (SBRT): It is one of the most advanced forms of radiotherapy. High doses of radiotherapy can be delivered within a very short period of time (3-5 days). It is mostly used in early prostate cancer, lung cancer, pancreas & early hepatocellular cancer as a curative modality. It can also be used in lung and liver metastasis as a palliative measure.