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Radiation Therapy · Modality & Technology
HDR vs LDR Brachytherapy — Sessions, Stay and Safety
Both place the radiation source inside you. The difference is how long it stays. HDR puts it in for minutes and takes it straight back out, so nothing radioactive remains and no isolation is needed. LDR leaves it in for hours, days, or permanently — which can mean a shielded-room stay. For most families, that stay is the real decider.
Medically reviewed by Dr. Venkata Sushma P, Radiation Oncologist, MBBS · MD (Radiation Oncology) · Last reviewed August 2026
- Minutes vs hours or days — HDR delivers its dose in roughly 5 to 20 minutes per session, then the source is withdrawn completely; LDR leaves the source in place while it works.
- Isolation only applies to one of them — After HDR you are not radioactive and your family can be with you immediately. A temporary LDR implant means a shielded single room with limited visiting.
- Older does not mean under-treated — LDR seed implants remain a guideline-recognised option for selected cases; the planned dose is held to the same standard either way.
- Delivered at NABH-accredited partner centres — CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout, whichever dose rate your case calls for.
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The short answer
How long is the radiation source actually inside me?
Minutes with HDR. Hours, days, or permanently with LDR. That single line is the whole difference. HDR stands for high dose rate: the source is driven in, sits at the tumour for roughly five to twenty minutes, and is pulled fully back out before you leave the room. LDR, low dose rate, leaves it in.
The dose your team plans is the same target either way. What changes is the speed at which it is delivered, and therefore how long you and the source have to share a room. In HDR the source is never handled by a person at all — a shielded afterloading machine sends it down a thin channel into an applicator that was already positioned in you, then retracts it completely when the timer ends.
In LDR the source stays put and gives its dose slowly. A temporary LDR implant is left in place for hours or a few days and then removed. A permanent seed implant, used mainly for selected prostate cancers, is placed once and never taken out; the seeds simply fade over weeks to months.
Your brachytherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout, whichever dose rate your case calls for.
Did you know?
Because the source sits at or inside the tumour, the brachytherapy dose falls away steeply within a couple of centimetres — which is why so little reaches the tissue further out. The WHO lists brachytherapy equipment as essential for cancer services, and NCCN and ASTRO guidance treats it as a core part of definitive treatment for locally advanced cervical cancer, not an optional extra. Guidance current as of 2026.
The question families actually ask
Do I need isolation — and is my family at risk?
After HDR: no isolation at all. Nothing radioactive is left in you, so you are not a radiation source. Your husband, your mother, your child can sit with you the moment the session ends. After a temporary LDR implant: yes. The source is inside you continuously, so you stay in a shielded single room until it is removed.
This is the difference that reorganises a household, and it is worth asking about before you agree to anything. A shielded-room stay means visiting is limited by both time and distance — a spouse can come in, but for a set number of minutes and from a marked position, and children and pregnant visitors are usually asked to stay away for the duration. Nurses plan their contact time deliberately for the same reason. None of this is a sign that something has gone wrong. It is ordinary radiation-protection practice while a source is in the room.
Permanent seed implants sit in between. There is no isolation and no shielded room, and you go home the same day or the next. Because the seeds keep giving off a very short-range dose while they decay, most centres give dated written advice about prolonged close contact — typically a child on your lap for long periods, or sharing a bed with someone who is pregnant — for a limited number of weeks. Everyday contact, cooking, travelling and working are not restricted.
Ask your treating centre directly: “Will I need a shielded room, and if so for how many nights?” The answer tells you more about what treatment will do to your week than the dose rate ever will.
Side by side
HDR vs LDR brachytherapy — side by side
A starting framework to take into your own consult. Every row is a question worth putting directly to your radiation oncologist about your specific plan.
| Factor | HDR (high dose rate) | LDR (low dose rate) |
|---|---|---|
| How long the source is in place | Minutes per session — commonly around 5 to 20 | Hours to a few days (temporary implant), or left in place for good (permanent seeds) |
| Shielded room or isolation | Not required — family can be with you straight after | Temporary implant: yes, a shielded single room with limited visiting. Permanent seeds: no isolation |
| Anything radioactive left in you | No — the source retracts fully into its shielded machine | Temporary implant: no, once removed. Permanent seeds: yes, decaying over weeks to months |
| Typical number of visits | A small number of short sessions over days or weeks | Usually a single implant procedure |
| Hospital stay | Usually day care; overnight only if applicator placement needs it | Temporary: inpatient for the length of the implant. Permanent seeds: same day or one night |
| Anaesthesia or sedation | Usually needed to place the applicator | Usually needed to place the implant |
| Where it is most often used | Cervix and uterus, oesophagus, airway, breast, some head and neck sites | Prostate seed implants; some gynaecological and eye programmes |
| Restrictions after you go home | None related to radiation | Temporary: none once removed. Permanent seeds: short-term advice on prolonged close contact |
| Who it can suit | People who need to be home the same day, or cannot be away overnight | People who would rather have one procedure than repeated visits |
| Cost pattern (indicative only, as of August 2026) | Priced per session plus planning, imaging and applicator charges — ask for a written estimate | Priced as one implant procedure, with the sources a large part of it — ask for a written estimate |
| Delivered at | An NABH-accredited partner centre; CION Cancer Clinics coordinates the plan, the team and the care | |
This table is a starting framework, not a plan. Which approach suits you depends on your cancer site, its size and stage, your general health and what the delivering centre runs — ask your radiation oncologist how each row applies to your own case.
Planning your calendar
How many sessions will I need?
HDR is normally a small number of short sessions. They are usually spread over days or weeks, and often run alongside or straight after a course of external radiation. LDR is usually one procedure. One implant, either left in for a set period and then taken out, or left permanently in place.
The exact number for HDR is set by your cancer site, the total dose your team is aiming for, and whether brachytherapy is the main treatment or a boost added to external radiation. It is planned individually from your imaging — there is no fixed count that applies to everybody with your diagnosis, and you should ask for your number before you start rather than after.
A fair warning about how this reads on paper: a plan with fewer visits is not a lighter plan, and a plan with more visits is not a harsher one. Dose delivered slowly over two days and dose delivered in several short bursts are two engineering routes to the same planned target. What you are comparing is a schedule, not a strength.
If travel from a district is part of your life, say so at the consult. The number of trips, not the dose rate, is often what decides which schedule is workable for a family.
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Get your brachytherapy schedule explained before you agree to it
A radiation oncologist can tell you how many sessions your plan involves, whether a shielded room is part of it and what your family needs to know — free, confidential, no commitment to start treatment.
The real framework
What actually decides whether your plan is HDR or LDR?
In practice you are rarely handed a free choice between the two. These are the factors that make one or the other the sensible route for a given case.
Cancer site
Where the tumour actually is
Site is the first filter. Permanent seed programmes are built around selected prostate cancers, while most gynaecological, airway and oesophageal brachytherapy in India is delivered as HDR.
Role in the plan
Whole treatment or a boost
Brachytherapy is often a boost that follows external radiation. A boost is usually split into a few doses, which fits the HDR pattern of several short sessions rather than one long implant.
Staying still
Whether you can lie flat for a long stretch
A temporary LDR implant means staying largely still in a shielded room for the whole implant period. Your mobility, your breathing and your pain control all count in that decision.
Household
Who is depending on you at home
If you have a small child, an elderly parent or a job you cannot leave overnight, an approach that avoids a shielded-room stay changes your fortnight more than the dose rate does.
Fitness for anaesthesia
One procedure or several
Placing an applicator or implant usually needs sedation or anaesthesia. Your fitness for a single longer procedure versus a few shorter ones is a genuine clinical input here.
Centre capability
What the delivering centre runs
Not every centre offers both. What the NABH-accredited partner centre delivering your treatment actually has, and how its slots run, is a real practical factor worth naming early.
If you have been offered LDR
Is LDR old technology — am I being under-treated?
No. LDR came first, but older is not the same as weaker. Permanent seed implants are still a recognised option in international guidance from bodies such as NCCN and ASTRO for carefully selected prostate cancers, and the dose is planned to the same standard as any other radiation technique.
Why has HDR become more common in many Indian centres? Largely for reasons that have little to do with how strong the treatment is. Sessions are short, staff radiation exposure is easier to control with a remote afterloader, no inpatient bed is tied up for days, and the source position can be adjusted between sessions if the anatomy shifts. Those are real operational advantages, and in many settings they are the reason a department standardised on HDR — not a verdict that LDR under-treats.
What that means for you is simple. If LDR has been offered, the question to ask is not “why am I getting the old one?” but “why does this suit my case?” A good answer will name your cancer site, its size and the dose your team is aiming for. If the answer is only “that is what we do here”, that is a fair reason to ask for a second opinion before you start.
Being told your treatment will be finished in one procedure is not a signal that less is being done. Ask to see the planned dose written down, and ask how it compares with the alternative schedule.
What the day involves
What actually happens on the day, for each approach
The steps below are the common shape of a brachytherapy day. Your own centre will give you its written protocol, which may differ in the detail.
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Placement, under sedation or anaesthesia
An applicator, catheters or seeds are positioned by the treating team. This part is common to both approaches, and it is the part most people are anxious about beforehand and remember least afterwards.
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Imaging and planning while it is in place
A scan confirms exactly where the applicator or implant sits, and the physics team calculates the dose from that image. This is why the position matters as much as the source itself.
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HDR: the source goes in, then comes out
You lie still and the room is cleared while the shielded machine drives the source in for a few minutes. Staff watch you on camera and speak to you throughout. Then it retracts fully.
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LDR: the source stays, and so do you
For a temporary implant you move to a shielded single room for the implant period, with visiting limited by time and distance. For permanent seeds, the seeds stay and you go home.
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Removal and discharge
The applicator or temporary implant is removed, usually with pain relief and often more quickly than expected. Once it is out, you are no longer a radiation source of any kind.
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Written instructions before you leave
Ask for them in writing and dated: what to expect over the next fortnight, who to call, and, if you had permanent seeds, exactly which close-contact precautions apply and for how long.
Bring these to your consult
Questions worth asking before your brachytherapy is booked
These work whichever dose rate comes up. They move the conversation from the label to your actual fortnight.
- Will I need a shielded room, and for how many nights? — the single question that tells your family what to plan for.
- How many sessions or procedures is my plan, exactly? — ask for the number in writing before you start, not after.
- Will anything radioactive still be in me when I go home? — the answer is no for HDR and for a removed temporary implant, and yes for permanent seeds.
- If it is permanent seeds, which close-contact precautions apply and for how many weeks? — ask for dated written instructions.
- Why does this dose rate suit my case specifically? — a good answer names your site, size and planned dose, not departmental habit.
- Which centre is delivering it, and what is the indicative cost and scheme cover? — get the estimate in writing before you decide.
You should not have to guess what the week looks like
One conversation usually settles the sessions, the stay and the safety rules
Whether HDR, LDR or both have been mentioned, a radiation oncologist can map out exactly what your own plan involves and what it will mean at home.
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Common questions
HDR vs LDR brachytherapy — your questions answered
How long is the radiation source actually inside me during brachytherapy?
It depends on which type you have. In HDR brachytherapy the source is moved into position by a shielded machine, sits at the tumour for a few minutes — commonly around five to twenty minutes — and is then pulled fully back out before you leave the room. In LDR brachytherapy the source stays in place far longer: a temporary implant is left in for hours or a few days, while permanent seed implants stay in the body for good and fade away over weeks to months. Your radiation oncologist will tell you the exact dwell time planned for your own applicator or implant.
Do I need isolation after HDR or LDR brachytherapy?
After HDR brachytherapy, no. Nothing radioactive stays behind, so you are not a radiation source and your family can sit with you the moment the session ends. A temporary LDR implant is different: because the source is inside you continuously, you stay in a shielded single room while it is in place, and visiting is limited by time and distance. Permanent seed implants do not need isolation either, but most centres give short-term advice about prolonged close contact with young children and pregnant women. Ask your treating centre for their written instructions in advance.
How many brachytherapy sessions will I need?
HDR brachytherapy is normally given as a small number of short sessions spread over days or weeks, often alongside or after external radiation. The exact count is set by your cancer site, the dose your team is aiming for and whether the brachytherapy is the main treatment or a boost. LDR brachytherapy is usually a single procedure instead: one implant, either left in for a set period and then removed, or left permanently in place. Neither pattern is a sign of more or less thorough treatment — they are simply two ways of delivering a planned dose.
Is LDR brachytherapy old technology — am I being under-treated?
No. LDR is older than HDR, but older does not mean weaker or outdated. Permanent seed implants remain a recognised option in international guidance from bodies such as NCCN and ASTRO for carefully selected prostate cancers, and the dose delivered is planned to the same standard. HDR has become more common for many gynaecological, airway and oesophageal cases largely for practical reasons: sessions are short, staff exposure is easier to control and most people go home the same day. If you are offered LDR, ask why it suits your case rather than assuming it is a downgrade.
Am I radioactive to my family after brachytherapy?
After an HDR session you are not radioactive at all. The source never stays in your body, so there is no restriction on hugging, sharing a bed or holding a child once you leave. After a temporary LDR implant is removed, the same applies. Permanent seed implants are the one situation where simple precautions are advised for a limited period, because the seeds keep giving off a very short-range dose while they decay. Even then the radiation travels only a short distance, and your centre will give you dated, written instructions on what to avoid and for how long.
How much do HDR and LDR brachytherapy cost in Hyderabad?
Costs are indicative only, as of August 2026, and cannot be quoted meaningfully without knowing your plan. HDR is generally priced per session, plus planning, imaging and applicator charges, so the total moves with the number of sessions. LDR is generally priced as one implant procedure, with the sources themselves forming a large part of the bill. Coverage under insurance, ArogyaSri or a government scheme depends on your policy, your diagnosis and the empanelment of the delivering centre. CION Cancer Clinics can help you get a written estimate before you decide.
This page explains HDR and LDR brachytherapy in general terms. It is not a substitute for guidance from your own oncology team about your diagnosis, your planned dose and the centre delivering your treatment.