CION Ameerpet
Radiation Therapy · Modality & Technology
Surface-Guided Radiotherapy — Treatment Without Tattoo Marks
Medically reviewed by Dr. Gangadhar Vajrala, Radiation Oncologist, MBBS · MD (Radiation Oncology) · MPH · Last reviewed August 2026
Surface-guided radiotherapy (SGRT) uses 3D cameras to map the contour of your skin many times a second, and positions you on the treatment couch from that live map. Because the camera reads your own body surface, permanent tattoo dots are often not needed. Accuracy is not traded away — it is checked differently.
- Often no permanent ink — where a centre runs a tattoo-free protocol, the dots can be replaced by the camera reading your own skin.
- Watched, not just lined up — the surface is monitored while the beam is on, and on machines set up for it the beam can be held if you drift.
- Accuracy is still verified — surface guidance sits alongside X-ray image guidance, which confirms the target inside you — it does not replace it.
- Availability is centre-by-centre — these systems are installed at selected centres in India; we will tell you honestly what the centre treating you actually has.
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The short answer
How does surface-guided radiotherapy track your position?
Surface-guided radiotherapy uses ceiling-mounted 3D cameras that project a harmless light pattern onto your skin and read the shape it makes. The system compares that live surface against the one recorded at your planning scan, and tells the therapists in real time if you have shifted by even a millimetre.
The cameras keep reading while the beam is on. If you drift outside the tolerance your team has set — because you moved, or took a deeper breath than expected — the system flags it, and on machines configured for it the beam can be held until you are back in position. Nothing is inserted, nothing is swallowed, and no extra radiation is used to take the measurement.
Your radiotherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout. So the honest answer to “will I get surface guidance?” depends on the equipment at the centre delivering your sessions — and we will tell you plainly what is available before you commit.
The sections below cover whether the tattoo dots are genuinely avoidable, a side-by-side comparison of both setup methods, and what actually happens to accuracy.
Did you know?
Surface guidance finds you with light, not radiation. The 3D cameras read the contour of your skin using ordinary visible light, so the positioning check itself adds no dose at all — which is why it can run continuously through a session rather than only at the start, per ASTRO patient-education material current as of August 2026.
The tattoo question, answered straight
Are tattoo marks actually avoidable?
Often, yes — but it is not automatic. Where a centre has surface guidance and runs a tattoo-free protocol, the permanent ink dots can be replaced by the camera reading your own skin. Many centres still place small temporary marks that wash off, and some treatment sites and body positions still call for permanent dots.
Three things decide it for you. First, whether the centre delivering your treatment has a surface-guidance system at all. Second, whether that centre has adopted a tattoo-free setup protocol — owning the equipment is not the same as using it that way. Third, whether your treatment site suits it. Breast and chest-wall treatment is where tattoo-free setup is most commonly offered, because the surface being tracked sits directly over the target.
If permanent marks are still needed for your plan, they are usually two to four pinpoint dots the size of a freckle — not a line and not a shape. Ask to see exactly where they will go before your planning scan. Our page on radiation tattoo marks and whether they are permanent covers what they look like, whether they fade, and what removal involves.
Raise this before simulation. The marks are placed at the planning scan, and the decision is much harder to revisit once the plan is built around them.
Side by side
Tattoo-based setup vs surface-guided setup
A comparison to bring into your own consultation. Both approaches are in routine use worldwide; which one you get depends on your treatment site and the equipment at the centre delivering your sessions.
| Factor | Conventional tattoo-based setup | Surface-guided setup (SGRT) |
|---|---|---|
| How you are lined up each day | Therapists align room lasers to permanent ink dots on your skin | 3D cameras match your live skin surface to the planning surface |
| What is left on your skin afterwards | Usually two to four permanent pinpoint dots | Often nothing, or temporary marks that wash off |
| Monitoring during the session | Position is set at the start, then checked by imaging | The surface is monitored continuously while the beam is on |
| If you move mid-session | A small shift may go unnoticed until the next image | The system flags it, and the beam can be held on machines configured for that |
| Does it see the tumour inside you | No — skin marks are a proxy; imaging checks the inside | No — the surface is a proxy too; imaging still checks the inside |
| Extra radiation from the positioning check | None from the marks themselves | None — the cameras use visible light only |
| Time on the couch | Well established, usually quick once the marks are found | Broadly comparable; can be quicker for some breast setups |
| Where it is most used | Every treatment site — the worldwide standard | Most established for breast and chest wall; also brain and breath-hold treatments |
| Availability in India | Available at essentially every radiotherapy centre | Installed at selected centres only — confirm before you assume |
| Cost pattern (indicative only, as of August 2026) | Included in standard radiotherapy planning | May be included, or priced within the technique package — ask for a written estimate |
| Is one approach “better”? | Neither in general — both are accepted; the choice follows your treatment site, your plan and the equipment at your centre | |
This table is a starting framework, not a diagnosis. Ask your radiation oncologist how each row applies to your own treatment site and plan.
Accuracy, without the marketing
Is the accuracy the same without tattoo marks?
Accuracy is not traded away, but it is checked differently. Surface guidance is very precise about where your skin is, and it keeps checking throughout the session. What it cannot see is the tumour itself. That is why surface guidance is used alongside X-ray image guidance, not instead of it.
Skin marks have exactly the same limitation. A tattoo dot records where the surface was on the day of your planning scan. It says nothing about whether your bladder is as full today, or whether the target has shifted with your breathing. Both approaches rely on image guidance — cone-beam CT or portal imaging — to confirm the internal target before the beam is delivered.
So the fair comparison is not ink versus cameras for accuracy. It is this: both are setup aids that work from the outside; one leaves a permanent mark and stops watching once the beam starts, the other leaves nothing behind and keeps watching. Neither one replaces the imaging that confirms where the target actually is.
The question worth asking at your consultation is not which camera the centre owns, but how your internal target is verified each day and how the team would know if it had moved.
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Ask about tattoo-free setup before your planning scan
The decision about skin marks is made at simulation, not afterwards. One conversation before that appointment is usually enough to know your options.
The real framework
Where does surface guidance change your experience — and where is a tattoo-based setup entirely appropriate?
Asked in general, “SGRT or tattoos?” has no single winner. These are the situations that actually decide it.
Surface guidance suits this well
Breast and chest-wall treatment
The surface being tracked sits directly over the target, which is why tattoo-free protocols are most established here.
Surface guidance suits this well
Deep-inspiration breath-hold
The cameras can confirm you are holding the same breath each time, which matters when the aim is to move the heart away from the field.
Surface guidance suits this well
Repeat or re-treatment setups
Where marks were already placed for an earlier course, a surface-based setup avoids adding more permanent dots to the same skin.
Surface guidance suits this well
Young patients, visible skin
For a young woman weighing a permanent mark on her chest or neckline, a tattoo-free option can matter a great deal. It is a fair thing to ask for.
A tattoo-based setup is entirely appropriate
Deep pelvic and abdominal targets
Where the target sits far from the skin, the surface tells you less, and daily imaging carries more of the accuracy either way.
A tattoo-based setup is entirely appropriate
Treatment using a mask or shell
Where an immobilisation mask holds the head still, marks are usually drawn on the mask rather than your skin, so the question often does not arise.
A tattoo-based setup is entirely appropriate
Centres without a surface system
Marks-based setup with image guidance is the accepted worldwide standard described by NCCN and ASTRO. It is not a lesser treatment.
Availability, stated honestly
Is surface-guided radiotherapy available in India, and will my centre have it?
Yes, but not everywhere. Surface-guidance systems are installed at selected radiotherapy centres in India, mostly larger and newer installations. They are not standard equipment at every centre. And having the system does not always mean the centre runs a tattoo-free protocol, so both are worth asking about separately.
CION Cancer Clinics does not own or operate a linear accelerator, a surface-guidance system, or any radiotherapy equipment. Your radiotherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout. That is also why we can tell you honestly, before you commit, what the centre delivering your sessions actually has — rather than describing a technology you may never be offered.
If surface guidance is not available where you will be treated, that does not mean your treatment is second-rate. Setup using skin marks combined with regular image guidance is the standard of care described by NCCN and ASTRO, and it is what the great majority of patients worldwide are treated with. Newer is not the same as necessary, and the difference here is mostly about your skin, not about how well the tumour is treated.
If avoiding permanent marks matters enough to you to travel or to change centre, say so early — it can be planned for, but only before your simulation appointment.
Bring this to your consult
Questions worth asking before your planning scan
Five short questions. Your team’s answers, not this page, should decide what happens to your skin.
- Will I need permanent tattoo marks for my treatment site? — ask at or before simulation; afterwards it is much harder to change.
- Does the centre treating me have surface guidance, and does it run a tattoo-free protocol? — these are two separate questions, and the second is the one that matters.
- If marks are needed, how many and exactly where? — you can usually see the intended positions before any ink is placed.
- How will my internal target be checked each day? — the answer should mention imaging, not only marks or cameras.
- Is any part of this technique priced separately? — ask for a written, itemised estimate (indicative, as of August 2026).
You are allowed to ask about the marks
Five minutes before your planning scan changes what is still possible
Once simulation is done and the marks are placed, the decision has been made for you. A radiation oncologist can walk you through the options while they are still open.
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Common questions
Radiotherapy without tattoo marks — your questions answered
How does surface-guided radiotherapy know where I am?
Surface-guided radiotherapy uses ceiling-mounted 3D cameras that project a harmless light pattern onto your skin and read the shape it makes. The system compares that live surface with the one recorded at your planning scan and tells the therapists, in real time, whether you have shifted. Because the check uses visible light rather than radiation, it can run continuously while the beam is on instead of only at the start of the session. Nothing is inserted, swallowed or injected for it to work.
Will I still need permanent tattoo marks if my centre uses surface guidance?
Often not, but it is not automatic. Three things decide it: whether the centre delivering your treatment has a surface-guidance system, whether that centre has adopted a tattoo-free setup protocol, and whether your treatment site suits it. Breast and chest-wall treatment is where tattoo-free setup is most commonly offered. Where permanent marks are still needed, they are usually two to four pinpoint dots the size of a freckle rather than a line or a shape, and you can ask to see where they will go before your planning scan.
Is surface-guided radiotherapy as accurate as setup with tattoo marks?
Accuracy is not traded away, but it is checked differently. Surface guidance is very precise about where your skin is, and it keeps watching throughout the session. What it cannot see is the tumour itself. Skin marks have the same limitation, because a dot records where the surface was on the day of your planning scan. That is why both approaches are used alongside X-ray image guidance, such as cone-beam CT, which confirms the internal target before the beam is delivered. Neither approach replaces that imaging.
Is surface-guided radiotherapy available in India?
Yes, but not at every centre. Surface-guidance systems are installed at selected radiotherapy centres in India, mostly larger and newer installations, and they are not standard equipment everywhere. Having the system also does not always mean the centre runs a tattoo-free protocol, so the two are worth asking about separately. CION Cancer Clinics does not own or operate a linear accelerator or a surface-guidance system; your radiotherapy is delivered at an NABH-accredited partner centre, and CION coordinates your treatment plan, your oncology team and your care throughout.
Does surface-guided radiotherapy add any extra radiation dose?
No. The cameras used in surface guidance work with ordinary visible light and read the contour of your skin, so the positioning check itself adds no radiation dose at all. That is different from the X-ray image guidance used to confirm the internal target, which does involve a small additional dose and is used on a schedule your radiation oncologist sets. If you are concerned about cumulative imaging dose, ask your team how often internal imaging is planned across your course.
Can I ask for radiotherapy without tattoo marks, and what if it is not possible?
You can, and it is a reasonable thing to raise, particularly if a permanent mark on visible skin matters to you. Raise it before your planning scan, because the marks are placed at simulation and the decision is harder to revisit afterwards. If a tattoo-free setup is not available where you are treated, that does not make your treatment second-rate. Setup using skin marks combined with regular image guidance is the standard of care described by NCCN and ASTRO, and it is what most patients worldwide are treated with.
This page explains surface-guided radiotherapy in general terms; it is not a substitute for guidance from your own radiation oncology team about your specific diagnosis, treatment site and plan, or for confirming what equipment the centre treating you has.