Stereotactic Body Radiotherapy (SBRT)
Stereotactic body radiation is radiation aimed with surgical precision at a tumour outside the brain, in the lung, liver, prostate or pancreas. Big dose. Few sessions. Almost no room for error. Ever wondered how a beam stays on a lung tumour that moves with every breath? This page explains how SBRT works, who it suits, and what treatment day feels like.
Reviewed by Dr. P. Vijay Karan Reddy · Radiation Oncologist ·
Last updated October 2026
Stereotactic body radiation therapy (SBRT) delivers a very high radiation dose to a small tumour in the body, usually in one to five sessions. Imaging and breathing control keep the beams on target. It's used for early lung cancer, prostate, liver and pancreatic tumours, and a few spread-out tumours, often when surgery isn't possible.
What Is Stereotactic Body Radiation? High Dose, Few Sessions
Picture a lung tumour the size of a walnut. It rises and falls with every breath, sometimes by a centimetre or more. SBRT meets it with many thin beams from different angles, all crossing at the tumour. Each beam alone is gentle. Together they deliver an ablative dose, strong enough to destroy the cells.
SBRT is also called SABR, stereotactic ablative radiotherapy. Mayo Clinic notes it gives a higher dose in just one to five treatments, where conventional radiation uses small doses over many weeks. Dr. Karan, a radiation oncologist, plans your treatment and oversees every session. In the brain or spine, the same method is called radiosurgery.
How Stereotactic Body Radiation Therapy Works
SBRT pairs a breathing-aware planning scan with a body mould and beams from many angles. Here's each stage.
SBRT by Cancer Type: Who Is a Candidate
SBRT suits small, well-defined tumours, often when surgery isn't an option. Dr. Karan uses it in four situations.
Key Benefits of Stereotactic Body Radiation Therapy
Each benefit depends on the tumour's size, site and movement, and the cost of SBRT in India varies with sessions and imaging.
Stereotactic Body Radiation vs. Other Options
SBRT isn't the only way to treat a tumour in the body. Here's how it compares with surgery, conventional radiation and radiosurgery, and where each fits.
SBRT vs. surgery for early lung cancer
Surgery removes the tumour, stages it fully and remains the standard when you're fit for it. SBRT needs no incision and suits people with weak lungs or heart conditions. Cleveland Clinic notes recent studies show similar results for some early-stage lung cancers.
SBRT vs. conventional radiation
Conventional radiation gives small daily doses over several weeks and safely treats larger areas. SBRT gives a high dose in one to five sessions to a small, defined target. Dr. Karan's view: if the tumour is small enough, or it's an early-stage cancer like lung or prostate, ask whether SBRT can save you weeks of travel.
SBRT vs. radiosurgery
Same precision, different targets. SRS treats the brain, where a mask or frame holds the target still. SBRT treats tumours in the chest, abdomen and pelvis, which can shift as you breathe, so it adds 4D-CT, breath-hold or gating.
Preparing for Stereotactic Body Radiation
SBRT preparation centres on one goal: knowing exactly where a moving tumour sits. Here's what that involves.
Motion Management: How SBRT Keeps Up With Your Breathing
Breathing moves organs, so SBRT measures, limits or follows it. At Dr. Karan's centre, SBRT runs on a TrueBeam STx linear accelerator with HyperArc, with kV and cone-beam imaging and breath-hold.
What a Treatment Day Looks Like
- 01
Check-in
You arrive at Apollo Hospital, Financial District, with a full bladder if it's a prostate treatment. The team confirms your name and plan.
- 02
Positioning
You settle into your cushion or mould, and the team lines you up using skin marks and, where used, markers.
- 03
Imaging check
A cone-beam CT, a quick 3D scan on the machine, shows the tumour or its markers, and the team aligns you within millimetres.
- 04
Beam delivery
Beams switch on as you breathe or hold your breath on cue. You'll feel nothing. You're on the table for up to 15 minutes, and with 30 to 45 minutes of waiting the whole visit takes around 60 to 90 minutes.
- 05
Going home
You go home the same day. Between sessions you can usually eat, work and move as normal, and call the team about anything new.
Stereotactic Body Radiation Side Effects and Recovery
Is SBRT gentler than conventional radiation? Often, because less healthy tissue is treated. Effects depend on the site, and most are mild and short-lived.
Short-Term Effects
Tiredness for a few days is common. Lung treatment can bring a mild cough, abdominal treatment nausea, and prostate treatment urinary urgency. Skin may feel dry or itchy. Medicines and rest settle most of these.
Long-Term Effects
Weeks to months later, lung treatment can inflame the lung (pneumonitis), causing cough or breathlessness that medicine usually settles. Scarring often shows on scans without symptoms. Less often, ribs, bowel or bladder are affected.
Recovery Between Sessions
With only a few sessions, effects have little time to build. Most people rest, eat normally and keep light routines, and the team is there if something worries you.
Considering SBRT? Get a Second Opinion First
Not sure SBRT is right for your tumour, or whether surgery or conventional radiation would serve you better? Send your scans and reports. Dr. Karan will weigh the tumour's size, site and movement against each option and tell you plainly what he'd recommend, with eleven years in radiation oncology behind that advice.
What Happens After Treatment
SBRT keeps working for weeks to months after treatment ends. Here's the general roadmap, not a personal schedule.
Follow-up differs by site: chest scans for lung, PSA tests for prostate, scans and blood tests for liver and pancreas. Your schedule is agreed with you before treatment ends.
Questions Patients Ask Us
None in practice. SABR (stereotactic ablative radiotherapy) is another name for SBRT, stressing that the dose is high enough to destroy the tumour.
Usually one to five, and up to eight for tumours near the main airways. At Dr. Karan's centre SBRT takes 3 to 5 sessions for every site. Lung courses run over three to five days and prostate over one to three weeks.
No, the beams can't be felt. The harder part is lying still, often with your arms above your head, for up to 15 minutes, and the team can give pain relief or something calming if needed.
Generally lung, prostate, liver, pancreas and kidney tumours, plus a few spread tumours in bone, lymph nodes or adrenal glands. Dr. Karan uses it for lung, prostate, pancreatic and, rarely, liver cancer.
It's cancer that has spread to only a few places. Dr. Karan treats it with SBRT, either at the sites of spread or sometimes at the primary cancer, and there's no fixed limit on how many tumours. The choice rests on the state of the disease and where it has spread. In the phase 2 SABR-COMET trial, adding SBRT to standard care more than doubled five-year survival, from 17.7% to 42.3% (Journal of Clinical Oncology, 2020). Dr. Karan reads that result as a benefit of treating the primary cancer, not the sites of spread: in stage 4 disease, once the spread responds to drug treatment, treating the primary site helps control and survival.
Rarely at Dr. Karan's practice, and only for early-stage tumours that can't be operated on. The liver limits how much dose it tolerates.
Only if your tumour moves with breathing or is hard to see on scans. Many sites need neither.
It depends on the number of sessions, imaging and hospital, so there's no single price. At Dr. Karan's centre, a course of SBRT costs ₹4.5 lakh.
Coverage depends on your policy, and some policies set limits on newer treatments such as stereotactic radiation. Ask the billing desk to request pre-authorisation once your plan is confirmed.
Not necessarily: protons are a type of radiation, while SBRT is a way of aiming a few high doses, usually with X-rays. Dr. Karan says protons suit almost any case where radiation is used, but cost is the barrier.
Find Out Whether SBRT Fits Your Case
Send your scans, and Dr. Karan will explain whether stereotactic body radiation suits your tumour, how its movement would be managed, and how many sessions it would take. A straight answer, no hard sell.
Written & reviewed by Dr. P. Vijay Karan Reddy ·
Radiation Oncologist · Last reviewed October 2026