Radiation Therapy Services
2 Dimensional Conventional Radiation Therapy
Conventional treatments offered using linear accelerator. Although the service is named as conventional, at Aditya Birla Memorial Hospital, all patients undergo CT scan based planning, and port film verification with this technique, using the latest high resolution amorphous silicon portal imager for this purpose.
3 Dimensional Conformal Radiation Therapy (3D-CRT)
Tumours are not regular, they come in different shapes and sizes. The 3D-CRT uses computers, and high-definition software with special imaging techniques to map the size, shape and location of the tumour. Various radiation beam approaches are then visualized so that the best plan, targeting the tumour with the highest dose of radiation may be selected. The accuracy of the selection process saves healthy tissue from damage.
Intensity Modulated Radiation Therapy (IMRT)
IMRT is a type of external-beam radiation therapy that uses CT scans to form 3D pictures of the tumour before treatment. The computer then analyzes the size, shape, and location of the tumour. Beams from different angles are divided into millimeter sized beamlets (voxels), where the intensity (strength) of the beams within the beamlet can be adjusted to minimize the dose reaching the most sensitive adjacent normal tissues. This allows clinicians to deliver an even higher dose to the cancer areas.
Image Guided Radiation Therapy (IGRT)
Tumours can move between treatment sessions due to changes in organ-filling. There could also be a variation in patients position during day-to-day treatment setup. The new technology adopted at our cancer wing, helps overcome this challenge. The change in the position of tumour can be tracked with a CT scan mounted on a LINAC (called Cone Beam CT), just before treatment delivery and the necessary corrections can be made online, enabling precision delivery of radiation.
Volumetric Modulated Arc Therapy (VMAT)
During VMAT, the radiation machine rotates around the patient in single, or a series of arcs delivering focused beams of radiation to the cancer. The shape and intensity of the radiation beams changes as the machine rotates, depending upon the planning. These features mean that, in effect, the beam of radiation can come from an infinite number of angles, thereby reducing the dose of radiation to normal tissue while increasing the dose to the cancer. The arc-based delivery also allows the radiation oncologist to successfully treat tumors that are adjacent to critical structures in the body, should the tumor be wrapped around an organ.
Stereotactic Radiation Therapy (SRT)
Radiation therapy is delivered with stereotactic precision but divided into small daily fractions, given over several weeks using a re-locatable head frame. This technique is used for tumors located close to sensitive structures, such as the optic nerves or brain stem. Diseases that are commonly treated with this modality include malignant brain tumours, primary brain gliomas, meningiomas, pituitary adenomas and acoustic neuromas.
Active Breathing Coordinator (ABC) & Stereotactic Body Radiation Therapy (SBRT)
Hypo fractionated high-dose Stereotactic Body Radiotherapy (SBRT) is a relatively novel technique that involves the use of a few sessions of precise, high dose radiotherapy. Linked to the digital accelerator through the ResponseTM gating interface, automated gated breath-hold treatments can be delivered. From 3D conformal and IMRT to complex VMAT treatments, including stereotactic treatments, can all be delivered with confidence and efficiency. By providing comfortable and reproducible breath hold, ABC has been widely used for stereotactic treatment in the lung and has been proven effective in clinical practice as it:
•Immobilizes target anatomy through planning, imaging and delivery
•Enables dose escalation for SBRT techniques
•Reduces dose to adjacent organs at risk (OAR)
•Supports automated gating for workflow efficiencies
High Dose Rate Brachytherapy
We have a high dose-rate brachytherapy unit that delivers extremely precise internal surface radiation to the tumour site. The radiation source is placed at the site using specialized catheters, cylinders and other applicators that minimize the amount of radiation passing through other parts of the body. The treatments are comfortable and delivered mainly on an out-patient basis.