Authorised Indian Distributor
Saxsons Group
New Delhi, India · Since 1997
SBRT Immobilization SystemIndexed Platform + Bridges + T-Vacuum Cushion + Indexing Bar + Respiratory Belt
Complete stereotactic body radiation therapy immobilisation system — couch-indexed platform with belly bridge, knee bridge, wing-board T-grip, knee + feet cushion, elevation cushion, T-shaped vacuum cushion, carbon-fibre headrest, lockable indexing bar and respiratory belt. The full ten-component chain that AAPM TG-101 expects for lung, liver, abdomen, pelvic and spine SBRT delivery. Clear scale marks on every adjustable component for fraction-to-fraction reproducibility; quick-lock / unlock bridges for fast setup; compatible with all major linac couch-tops.
Key Features
- Comprehensive ten-component SBRT immobilisation system — every layer of the AAPM TG-101 chain is in the box
- Indexed SBRT platform locks onto the linac and simulator couches at the standard couch-bar pitch — same indexing across CT-sim and treatment
- Belly bridge — adjustable belly compression for abdominal SBRT; restricts respiratory excursion and shrinks the ITV-to-PTV margin
- Knee bridge — knee elevation paddle with left/right and vertical adjust; locks femoral rotation and pelvic tilt for pelvic SBRT
- Wing-board T-grip — above-head arm-support T-grip keeps both arms out of the chest/abdomen field; DIBH-compatible ergonomics for breath-hold workflows
All Features
- Comprehensive ten-component SBRT immobilisation system — every layer of the AAPM TG-101 chain is in the box
- Indexed SBRT platform locks onto the linac and simulator couches at the standard couch-bar pitch — same indexing across CT-sim and treatment
- Belly bridge — adjustable belly compression for abdominal SBRT; restricts respiratory excursion and shrinks the ITV-to-PTV margin
- Knee bridge — knee elevation paddle with left/right and vertical adjust; locks femoral rotation and pelvic tilt for pelvic SBRT
- Wing-board T-grip — above-head arm-support T-grip keeps both arms out of the chest/abdomen field; DIBH-compatible ergonomics for breath-hold workflows
- Knee + feet cushion — conformal lower-leg support under the knee bridge; reproducibility beyond the bridge alone
- Elevation cushion — variable-height head and shoulder elevation for thoracic SBRT diaphragm-baseline reproducibility
- T-shaped vacuum cushion — bead-fill conformal hold under vacuum; locks the patient outline at simulation, reproduces the shape every fraction
- Carbon-fibre headrest — radiolucent low-attenuation head support; reproducible cervical-spine curvature across fractions
- Lockable SBRT indexing bar — locks the platform to the couch at a defined position; reproduces the planning isocentre fraction-to-fraction
- Respiratory belt — pairs with 4D-CT or DIBH gating; sets the per-patient motion-management baseline
- Quick-lock / unlock bridge system — single-action lock; operator sets up in seconds, no fiddly screw cycle
- Clear scale marks on every adjustable component — reproducibility reads from the scale, not from feel
- Universal couch-top adapters — drop-in fit for the major linac couch-tops; same SBRT platform across vendor brands
- Compatible with S-Type thermoplastic mask for combined head + body SBRT workflows
- AAPM TG-101 and TG-178 immobilisation framework anchors the validation programme
Technical Specifications
| System composition | Ten-component SBRT chain (platform, belly bridge, knee bridge, wing-board T-grip, knee+feet cushion, elevation cushion, T-vacuum cushion, headrest, indexing bar, respiratory belt) |
| Platform indexing | Locks onto standard couch-bar pitch; index reproducibility within < 1 mm at the lock position |
| Bridge adjustment | Quick-lock / unlock — left/right and vertical adjust; clear scale marks on every axis |
| Headrest material | Carbon-fibre radiolucent composite — typical 1–2 % attenuation at MV photon energies |
| T-vacuum cushion | Bead-fill polystyrene in airtight polyurethane outer; quick-release valve; hand + electric pump compatible |
| Respiratory belt | Surface motion-tracking belt — compatible with 4D-CT, DIBH gating and surface-guided RT (SGRT) systems |
| Couch compatibility | Universal adapters for the major linac couch-tops on the Indian and global market |
| Mask compatibility | S-Type thermoplastic mask integration for combined whole-body SBRT |
| Imaging compatibility | CT, MR and DRR planning workflows; kV-imaging compatible for daily CBCT verification |
| Compliance framework | AAPM TG-101 (SBRT), AAPM TG-178 (immobilisation methodology), AAPM TG-176 (dosimetric handling) |
| Regulatory status (India) | Passive non-radioactive accessory — CDSCO Medical Devices Rules 2017 import registration; the system itself does not need AERB licensing (that sits on the linac facility) |
| Documentation | Per-batch material certificate, dosimetric-attenuation report, IQ / OQ / PQ protocols |
Applications
Five SBRT treatment workflows the ten-component system covers — plus the inspection-ready evidence chain
Lung SBRT
Platform + T-vacuum cushion + wing-board T-grip + respiratory belt. The respiratory belt sets the 4D-CT or DIBH baseline; the platform locks indexed position; the cushion locks the patient outline. ITV-to-PTV margin per AAPM TG-101.
Liver / abdomen SBRT
Platform + T-vacuum cushion + belly bridge + respiratory belt + wing-board T-grip. The belly bridge restricts respiratory excursion; DIBH workflows lock the breath-hold patient shape; daily CBCT verifies setup.
Pelvic / oligometastatic SBRT
Platform + T-vacuum cushion + knee bridge + knee+feet cushion. Knee bridge locks femoral rotation and pelvic tilt; cushion locks buttock and posterior pelvic shape; ideal for pelvic nodal and bone SBRT.
Spine SBRT
Platform + T-vacuum cushion + elevation cushion + carbon-fibre headrest. Spine SBRT cord-sparing dose-fall-off needs sub-mm reproducibility; the elevation cushion sets the supine-aligned baseline; daily CBCT confirms.
Combined H&N + body SBRT
Platform + S-Type thermoplastic mask + T-vacuum cushion. For SBRT workflows that need head-and-neck immobilisation alongside body-site SBRT — mask locks the upper-body shell; platform + cushion locks the rest.
Inspection-ready evidence chain
Per-batch material certificate + dosimetric-attenuation report + IQ / OQ / PQ protocols + per-fraction setup log. Ready for facility QA + medical-physics audit. The passive-accessory dossier plugs into the linac facility's own AERB licence — the SBRT system itself does not need a separate AERB permit.
Why SBRT Immobilization System?
Every layer of the AAPM TG-101 SBRT immobilisation chain — platform, bridges, cushion, mask compatibility, indexing, respiratory belt, accessories — supplied as one system. No mix-and-match procurement; no compatibility risk between vendors; the SBRT chain ships pre-validated.
Belly and knee bridges have single-action quick-lock; the platform locks to the couch in one motion via the indexing bar. The full setup — platform, bridges, cushion, belt, mask — completes in under 10 minutes for a trained operator. SBRT room throughput stays inside the daily fraction schedule.
Every adjustable component carries clear scale marks. The per-patient setup configuration is recorded once at the simulation visit; every subsequent fraction reproduces the recorded values exactly. Inter-fraction reproducibility is what AAPM TG-101 expects at SBRT dose levels.
Variant matrix
Ten components, four SBRT workflows, one chain
The system ships as a complete ten-component chain. The per-site build sheet configures which components engage for the workflow — lung needs the wing-board T-grip; abdomen adds the belly bridge; spine pairs the elevation cushion. The Accessories Matrix below covers the quick-lock and indexing details.
Ten-component SBRT chain
| SBRT platform | Indexed couch-side base shell — locks onto the linac and simulator couches at the standard pitch; the SBRT chassis everything else mounts on |
| Belly bridge | Adjustable belly compression for abdominal SBRT — restricts respiratory excursion to shrink the ITV margin |
| Knee bridge | Knee elevation paddle with left/right and vertical adjust — locks femoral rotation and pelvic tilt for pelvic SBRT |
| Wing-board T-grip | Above-head arm-support T-grip — keeps both arms out of the chest / abdomen treatment field, DIBH-compatible ergonomics |
| Knee + feet cushion | Conformal cushion that supports the lower legs under the knee bridge — improves comfort + adds reproducibility beyond the bridge alone |
| Elevation cushion | Variable-height head and shoulder elevation — used in thoracic SBRT to drop the diaphragm into a reproducible expiration baseline |
| T-shaped vacuum cushion | Conformal-hold cushion shaped to the SBRT body region; the bead-fill locks under vacuum into the patient outline |
| Carbon-fibre headrest | Radiolucent low-attenuation head support — reproducible cervical-spine curvature across fractions |
| SBRT indexing bar | Lockable index bar that locks the platform to the couch at a defined position; reproduces the planning isocentre fraction-to-fraction |
| Respiratory belt | Surface respiratory-motion belt — pairs with 4D-CT or DIBH-gating to set the breath-hold or motion-management baseline |
Per-site build sheet
| SBRT site | Target | Configuration |
|---|---|---|
| Lung SBRT | Peripheral and central lung nodules; 4D-CT-derived ITV or DIBH | Platform + T-vacuum cushion + wing-board T-grip + respiratory belt |
| Liver / abdomen SBRT | Liver, kidney, adrenal metastases; DIBH or breath-hold | Platform + T-vacuum cushion + belly bridge + respiratory belt + wing-board T-grip |
| Pelvic / oligometastatic SBRT | Pelvic nodal or bone SBRT; free-breathing | Platform + T-vacuum cushion + knee bridge + knee+feet cushion |
| Spine SBRT | Vertebral SBRT; cord-sparing dose-fall-off requirement | Platform + T-vacuum cushion + elevation cushion + carbon-fibre headrest |
Accessories Matrix
| Quick-lock / unlock bridge system | Single-action lock for belly and knee bridges — operator sets the patient position in seconds, no fiddly screw cycle |
| Clear scale marks on every adjustable component | Reproducibility across fractions reads from the scale, not from feel; the operator records the per-patient setting once and reproduces it every day |
| Couch-top adapters (universal) | Drop-in fit for the major linac couch-tops on the Indian and global market; same SBRT platform across vendor brands |
| S-Type thermoplastic mask compatibility | For SBRT workflows that pair the body platform with head-and-neck mask immobilisation (combined whole-body SBRT) |
| Pairing with Vacuum Cushion (RT-020) | Standard chain — SBRT platform + T-shaped vacuum cushion form the conformal-hold layer that AAPM TG-101 expects on body-site SBRT |
| Indexing strap | Locks the T-shaped vacuum cushion onto the platform at the indexed position; setup transfers from CT-sim to linac without per-room recalibration |
Per-batch material certificate and dosimetric-attenuation report ship with every system. Couch-top adapter specified to the receiving linac during site IQ / OQ.
Catalogs & Resources
AAPM references that anchor the SBRT immobilisation chain. Contact Saxsons for India pricing, couch-top adapter selection and IQ / OQ / PQ documentation.
AAPM TG-101 — Stereotactic Body Radiation Therapy
AAPM task-group report defining SBRT delivery framework and immobilisation expectations.
AAPM TG-178 — Methodology to determine the use of body immobilisation devices
AAPM task-group report on body immobilisation device characterisation and clinical-use methodology.
AAPM TG-176 — Dosimetric effects of couch tops and immobilisation devices
AAPM task-group report on dosimetric handling of immobilisation devices in the treatment beam path.
SBRT Immobilization System
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FAQ
SBRT immobilisation — questions we hear from Indian radiation-oncology teams
Why SBRT margins can't tolerate free-breathing motion, what the ten-component chain locks down, how belly compression reduces lung / liver tumour excursion, and how the system is supplied across India.
Q.What makes SBRT setup so different from routine external-beam radiotherapy?
SBRT delivers 1–5 hypofractionated ablative doses (often 12–20 Gy per fraction) with 3–5 mm PTV margins to targets that move with breathing (lung, liver, pancreas) or that share edges with sensitive structures (spinal cord in spine SBRT). Any inter-fractional or intra-fractional setup error at the scale of the margin translates directly into either a geometric miss on the tumour or an overdose on the organ at risk. That is why AAPM TG-101 mandates a full immobilisation chain — not a single accessory — for every SBRT indication.
Q.What does the SBRT Immobilization System actually include, and why the ten-component chain?
The system ships as one indexed platform plus nine setup-and-hold components — belly bridge (abdominal-motion compression), knee bridge (pelvic tilt reproduction), wing-board T-grip (arm position lock), knee + feet cushion, elevation cushion, T-shaped vacuum cushion (conformal patient hold), carbon-fibre headrest, lockable indexing bar (fraction-to-fraction couch registration) and respiratory belt (breath-monitoring / DIBH gating input). Each component addresses one specific reproducibility failure mode; leaving one out is where SBRT setup accuracy typically drops below the margin.
Q.How does breath compression (belly bridge) actually reduce lung / liver tumour motion?
Abdominal compression restricts diaphragmatic excursion by 30–70 % depending on patient anatomy. That reduces peak-to-peak tumour motion in the lower lobes of the lung and in the liver dome from 15–20 mm free-breathing down to 5–10 mm compressed. The residual motion is small enough to be contained in the ITV or gated with breath hold — so the SBRT margin stays at the plan value instead of expanding to swallow uncontrolled motion.
Q.Is the system indexed to standard linac couches?
Yes. The lockable indexing bar mounts to the standard couch-bar-pitch interface used by Varian TrueBeam / Halcyon / Ethos, Elekta Versa HD / Infinity and Accuray Radixact linacs. The platform locates to the same couch coordinates every fraction — no free-hand realignment; the setup deltas the CBCT catches are patient-shape deltas, not platform-placement deltas.
Q.How is the SBRT Immobilization System supplied and supported in India?
The system is distributed across India by Saxsons Group under SKU RT-021. Supply covers the full ten-component chain, indexed platform, applications training for the mould-room / therapist team, and setup-workflow support for lung, liver, abdomen, pelvis and spine SBRT indications. The system is a passive non-radioactive accessory imported under CDSCO Medical Devices Rules 2017 — no AERB licence needed for the device itself.
SBRT Immobilization System supplier in India — Saxsons Group
Saxsons Group has supplied radiotherapy equipment to over 1,000 Indian hospitals since 1988. Every consignment of SBRT Immobilization System ships with cold-chain logistics, AERB import documentation, CDSCO registration references and a Certificate of Analysis delivered before dispatch — the paperwork your radiation-safety and procurement teams need, pre-assembled.
- Nationwide delivery footprint — every metro and tier-2 city in India, scheduled to your treatment / procedure calendar.
- AERB & CDSCO documentation — import licence, radiation-safety paperwork and RSO briefing pre-assembled for the audit file.
- 40+ years in Indian oncology — long-standing supply relationships with AIIMS, Tata Memorial, and hundreds of tertiary-care centres.
- Single point of accountability — one purchase order, one delivery contact, one after-sales team across the whole product family.
Also supplied by Saxsons Group across India
The complete SBRT immobilisation chain in one system
Contact Saxsons Group for SBRT system supply, couch-top adapter selection, accessory configuration, IQ / OQ / PQ documentation and CDSCO medical-device import registration.