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If radiation has been suggested for your brain tumour, the word can sound frightening. This guide explains what radiation really involves — in plain language, step by step.
Radiation therapy uses carefully aimed beams of high-energy X-rays to damage the DNA of tumour cells so they can no longer grow and divide. Healthy cells repair this damage far better than tumour cells do — which is why the dose is usually spread out over many small daily sessions. The treatment itself is completely painless: you lie still on a couch while a machine moves around you, and you feel nothing as the beam works.
The two techniques you will hear most about are IMRT and IGRT. IMRT (intensity-modulated radiation therapy) shapes the beam to the exact outline of your tumour and varies its strength, so the tumour gets a high dose while nearby healthy brain receives much less. IGRT (image-guided radiation therapy) takes a quick image right before each session to confirm the target is in exactly the right place. Together they make brain radiation more precise — and safer for the brain around the tumour.
Radiation is one part of a complete plan. It often follows surgery, sometimes runs alongside chemotherapy for brain tumours, and is reviewed for every patient at CION's multidisciplinary tumour board. At CION, radiation therapy is delivered directly by our radiation oncology team.
The word "radiosurgery" can be misleading — there is no cutting involved. Stereotactic radiosurgery delivers many precisely aimed radiation beams that meet at the tumour, giving a high dose there while sparing the brain around it. NCCN and the European Association of Neuro-Oncology (EANO) guidelines support focused radiation techniques like IMRT, IGRT and radiosurgery because they protect healthy brain — which helps lower the risk of long-term effects on memory and thinking compared with older, less targeted radiation.
Radiation is not used for every brain tumour, and it is rarely the only treatment. Your radiation oncologist recommends it in situations such as these:
Some benign, slow-growing tumours are simply watched with scans and never need radiation. The right choice always balances benefit against risk for your tumour — a decision made with you at the tumour board. Book a free consultation to understand which applies to you.
"Radiation" is not a single treatment. The technique is chosen to match the tumour's type, size and location, and the goal of treatment. Here are the main approaches you may hear about. At CION, IMRT and IGRT are delivered directly by our radiation oncology team; highly specialised radiosurgery on a dedicated Gamma Knife or proton unit is arranged as part of coordinated radiosurgery care.
IMRT is the workhorse of modern brain radiotherapy. The radiation beam is divided into many small "beamlets," each with its own adjustable intensity, so the dose can be sculpted to the exact three-dimensional shape of the tumour. This lets your radiation oncologist deliver a high, effective dose to the tumour while keeping the dose to nearby healthy structures — the brainstem, optic nerves and healthy brain — as low as possible. IMRT is used for most fractionated brain radiation courses, including after surgery for high-grade gliomas, and is delivered directly by CION over a series of short, painless daily sessions.
IGRT is not a separate machine but an added layer of accuracy used with IMRT. Right before each treatment session, a quick imaging scan checks that the tumour and your head are in exactly the planned position; tiny adjustments are made before the beam switches on. Because the brain sits in a fixed bony skull and a custom mask holds the head still, this daily verification means the high-dose region lands precisely on the target every single day — reducing the dose that reaches healthy brain. CION uses image guidance as standard for brain tumour radiation, so accuracy is confirmed at every session.
Despite the name, stereotactic radiosurgery involves no cutting. It delivers many finely focused beams that converge on a small target from different angles, giving a very high dose to the tumour while the surrounding brain receives very little. SRS is ideal for small, well-defined tumours and for brain metastases, and is typically completed in 1 to 5 outpatient sessions with no incision and no recovery period. Highly specialised radiosurgery using a dedicated Gamma Knife or CyberKnife platform is arranged as part of coordinated radiosurgery care. Read our full stereotactic radiosurgery explainer.
"Fractionation" means dividing the total radiation dose into many small daily doses, usually 5 days a week. For a standard high-grade glioma course this runs over about 6 weeks — roughly 30 sessions. Spreading the dose out gives healthy brain cells time to repair between sessions, while tumour cells, which repair poorly, accumulate damage. This is why a daily routine of short visits, rather than one large dose, is the standard for most brain tumours. Your radiation oncologist sets the exact number of sessions based on your tumour grade, size and overall health, and explains the schedule before you begin.
Whole-brain radiation treats the whole brain rather than a single target. It is used mainly when there are many brain metastases, or a high risk of microscopic spread that focused radiation cannot cover. Because it treats healthy brain as well, modern practice reserves WBRT for situations where focal radiation or radiosurgery is not enough, and techniques such as hippocampal-sparing planning are used where appropriate to better protect memory. Whether WBRT or focused radiation fits you depends on the number and size of lesions and your overall situation — a decision your radiation oncologist will talk through clearly with you.
Proton therapy uses protons rather than X-rays. Protons release most of their energy at a set depth and then stop, so there is little dose beyond the tumour — useful for selected tumours near very sensitive structures, and particularly in younger patients where protecting developing healthy tissue matters. It is a highly specialised treatment available at a limited number of centres. CION does not operate a proton unit in-house; where proton therapy is the best option, it is arranged as part of coordinated specialist radiosurgery and radiation care, while CION continues to manage your overall treatment plan.
Important: the right technique for you depends on a careful review of your scans and diagnosis. This page explains the options — your brain tumour treatment team will recommend the one that fits your tumour.
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Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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Get a clear explanation of which radiation technique fits your tumour, how many sessions you'll need, and the side effects to expect — from a coordinated neuro-oncology team. Decisions for healing, not billing.
Before a single beam is delivered, careful planning makes radiation both effective and safe. This planning phase usually takes a few days to a couple of weeks, and it is where the precision of IMRT and IGRT is built in:
The daily routine of treatment is far simpler than most people expect. A typical session looks like this:
Because the treatment is painless and outpatient, many people continue light daily activities throughout their course. Your team reviews you regularly to manage any side effects as they build up. Speak to a CION radiation oncologist to understand what your specific course would involve.
Modern, targeted radiation is designed to limit side effects, but some are common. Knowing what to expect helps you prepare:
CION provides the supportive and rehab care — steroid and seizure management, and cognitive or physiotherapy support where needed — directly alongside your radiation, so side effects are managed by the same team that plans your treatment.
For glioblastoma, radiation is not given alone. The international standard — established by a landmark clinical trial and recommended by NCCN — combines about 6 weeks of daily radiation with an alkylating chemotherapy taken at the same time, followed by further cycles of that medicine. A molecular marker called MGMT methylation, tested on the tumour sample, helps predict how well this chemotherapy will work. This is why radiation, systemic therapy and molecular testing are planned together — read more about chemotherapy for brain tumours.
Radiation is a major part of brain tumour treatment, and a second opinion is especially worthwhile in these situations:
CION offers a free written second opinion reviewed by a neuro-oncology tumour board, with radiation delivered in-house. We walk this journey with you — with transparent costs and decisions made for healing, not billing. Request your free review or call 18002028726. You can also explore the full brain tumour treatment pathway or the wider brain cancer & tumour hub.
A free written review of your imaging and plan — especially valuable if you've been offered whole-brain radiation without discussing focused radiosurgery, or want to understand the side effects first.
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Start Your Story. Book Free Consultation.No. Radiation therapy itself is completely painless — it feels no different from having an X-ray or a CT scan. You lie still on a treatment couch while the machine moves around you, and a single session usually takes only 10 to 20 minutes. You will not see, hear or feel the radiation beam. What can build up over a course of treatment are side effects — tiredness, some hair loss in the treated area, and mild skin changes on the scalp. These are managed by your radiation oncology team and usually settle in the weeks after treatment finishes. At CION, the radiation therapy is delivered directly by our radiation oncology team.
IMRT (intensity-modulated radiation therapy) shapes the radiation beam to the exact contour of the tumour and varies its intensity, so a high dose hits the tumour while nearby healthy brain — and structures like the optic nerves and brainstem — receive much less. IGRT (image-guided radiation therapy) adds daily imaging right before each session to confirm the tumour is in exactly the right position before the beam switches on. In modern brain radiotherapy the two work together: IMRT plans the precise dose, IGRT makes sure it lands accurately every single day. CION delivers both as standard for brain tumour radiation.
It depends on the tumour type and the goal of treatment. A standard course of fractionated radiation for a high-grade glioma is usually given over about 6 weeks — 5 short sessions a week, roughly 30 sessions in total. This spreads the dose out so healthy brain has time to recover between sessions. Some tumours need shorter courses, and stereotactic radiosurgery delivers a high dose in just 1 to 5 sessions for small, well-defined targets. Your radiation oncologist sets the schedule after reviewing your MRI, tumour grade and overall health, and explains it clearly before you start.
Radiation and surgery often work together rather than as either-or. For many high-grade tumours, radiation is given a few weeks after surgery to treat any tumour cells left behind. When a tumour is too deep or too risky to remove, radiation may be the main treatment instead of an operation. Stereotactic radiosurgery can treat small tumours and brain metastases without any incision at all. For glioblastoma, radiation is combined with alkylating chemotherapy as standard. Your tumour board decides the sequence based on tumour type, location and grade.
The most common short-term effects are tiredness, mild scalp skin changes, and hair loss in the treated area — hair often regrows after treatment, though sometimes thinner. Some people get headaches or feel nauseated, usually eased with steroids and anti-nausea medicine. Most short-term effects settle within a few weeks of finishing. A small number of people notice longer-term effects on memory or concentration, which is exactly why modern techniques like IMRT and IGRT are used — to protect healthy brain and lower this risk. Your team monitors you closely and provides supportive care throughout, all delivered directly by CION.
No — they are different tools for different situations. Targeted (focal) radiation, using IMRT/IGRT or stereotactic radiosurgery, treats just the tumour and a small margin around it, sparing the rest of the brain. Whole-brain radiation therapy (WBRT) treats the entire brain and is used mainly when there are many brain metastases or a high risk of microscopic spread. Modern practice favours focal radiation and radiosurgery where possible, because they better protect memory and thinking. Which approach fits you depends on how many lesions there are, their size and your overall situation — a decision your radiation oncologist will talk through with you.
Yes. Radiation therapy — including IMRT and IGRT — is delivered directly by CION's radiation oncology team. We plan the treatment from your MRI, contour the tumour and the healthy structures to protect, and deliver the daily sessions with image guidance. We also provide the systemic therapy, steroid and seizure management, and supportive care that go alongside radiation. Highly specialised radiosurgery using a dedicated Gamma Knife or proton unit is arranged as part of coordinated radiosurgery care where it is the best option. Every plan is reviewed by a multidisciplinary tumour board, so radiation fits into your complete treatment journey.
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