Authorised Indian Distributor
Saxsons Group
New Delhi, India · Since 1997
Delta4 Phantom+Patient QA System
The fastest 4D verification system for IMRT, VMAT, SRS, Radixact and TomoTherapy. Dual orthogonal detector planes give you per-fraction, per-beam, per-control-point confidence before every treatment.
Key Features
- Simultaneous 4D dose in two orthogonal planes (coronal + sagittal)
- Verifies IMRT, VMAT, Halcyon, SRS, SBRT, Radixact and TomoTherapy
- Single system for patient QA and daily machine QA
- Wireless Wi-Fi — no cables required during measurement
- Battery-operated (>4 h Li-ion) for free positioning
All Features
- Simultaneous 4D dose in two orthogonal planes (coronal + sagittal)
- Verifies IMRT, VMAT, Halcyon, SRS, SBRT, Radixact and TomoTherapy
- Single system for patient QA and daily machine QA
- Wireless Wi-Fi — no cables required during measurement
- Battery-operated (>4 h Li-ion) for free positioning
- No external trigger — fully autonomous acquisition
- Automatic temperature correction; no warm-up drift
- p-type silicon diodes: isotropic, FFF-beam compatible
- Detector stability: <0.1%/kGy (typ. 0.04%/kGy at 6 MV)
- DICOM RT plan, dose and structure import from any TPS
- Per-fraction, per-beam, per-control-point analysis
- Fast trolley delivery — no manual lifting needed
Technical Specifications
| Detector type | p-type silicon (p-Si) disc diode |
| Total detectors | 1,069 |
| Detector planes | Coronal and sagittal (dual orthogonal) |
| Detector dimensions | 1 mm diameter × 0.05 mm thick |
| Active volume | 0.04 mm³ |
| Resolution — central | 5 mm (6 × 6 cm² isocentric area) |
| Resolution — outer | 10 mm |
| Max field size | 20 × 38 cm² (merged); 20 × 20 cm² (single) |
| Phantom material | PMMA (optional Plastic Water DT) |
| Phantom diameter | 22 cm |
| Phantom length | 40 cm (total system 71 cm) |
| Total weight | 27 kg |
| Communication | Wi-Fi (wired Ethernet option available) |
| Power | Rechargeable Li-ion; >4 h per charge |
| Absolute calibration | Required; IC verification optional |
| TPS compatibility | Any TPS with DICOM RT (plan, dose, structures) |
| Modalities | Photon — with and without flattening filter (FFF) |
| Detector stability | <0.1%/kGy; typically 0.04%/kGy at 6 MV |
| Setup time | Seconds (trolley-mounted) |
Linac Compatibility
Varian
TrueBeam, Halcyon, Edge, Clinac
Elekta
Versa HD, Infinity, Synergy
Accuray
Radixact, TomoTherapy HDA, CyberKnife
ViewRay
MRIdian Linac
Siemens
Artiste, Oncor
Brainlab
Vero (with DICOM RT)
Any TPS with DICOM RT (plan, dose, structures) export is supported — including Pinnacle, Eclipse, Monaco, RayStation, Tomotherapy Hi-Art.
Delta4 Software Ecosystem
Core verification software included. Optional modules extend to machine QA, anatomy dose mapping, and statistical trending.
Delta4 Phantom+ Software
Core 4D verification suite. Instant pass/fail, gamma index, DTA, profile, isodose, per-control-point analysis. Customisable reporting. 21 CFR Part 11 audit trail.
Delta4 Machine QA
Daily machine QA: output constancy, flatness, symmetry, MLC position, couch rotation. One detector, two workflows.
Delta4 DVH Anatomy
Maps measured 4D dose onto patient CT anatomy. Delivers dose-volume histogram comparison for biological impact assessment.
Delta4 Statistics
Longitudinal QA trending across patients and machines. Identifies drift before it becomes a clinical issue. Network-compatible database.
Delta4 HexaMotion
6-DOF motion platform for moving-target verification — 4D SBRT and gating QA. Mounts directly under the phantom.
Clinical Applications
One system — the full scope of modern radiotherapy QA
Pre-treatment patient QA
Verify each IMRT and VMAT plan before first fraction. Complete gamma analysis and report in under 20 minutes.
SRS / SRBT verification
High-resolution 5 mm central detector grid meets sub-millimetre SRS spatial requirements with small-field corrections.
Radixact & TomoTherapy QA
Helical delivery QA — axial resolution expandable via merged measurement sets. Full rotational dose captured.
MR-Linac plan verification
Compatible with ViewRay MRIdian workflows via DICOM RT import and standard calibration chain.
Daily & monthly machine QA
Delta4 Machine QA module turns the same phantom into a linac QA tool — output, flatness, MLC leaf bank tests.
Moving-target / gating QA
Pair with Delta4 HexaMotion for 6-DOF motion, gated delivery verification and 4D SBRT dose reconstruction.
Why Delta4 Phantom+?
Competing systems measure in one plane. Delta4 Phantom+ captures the full 4D dose distribution simultaneously — coronal and sagittal — giving a complete volumetric picture without stitching or sequential acquisitions.
Add the Delta4 Machine QA software module and the same phantom handles daily output constancy, flatness, symmetry and MLC tests — reducing capital spend without switching equipment.
From trolley placement to signed-off PDF report in under 20 minutes. No cables, no warm-up, no manual lifting. The wireless Li-ion system is ready the moment you wheel it into the treatment room.
Delta4 Phantom+
More for this product
Each card opens a focused post for a specific specialty — peer-reviewed evidence and clinical workflow, written for the persona you select.
For Medical Physicist
Sensitivity to introduced plan errors
At what magnitude of MLC, gantry, collimator or MU error does the Delta4 gamma passing rate cross the 95 % action threshold? Per Udee 2024, J Med Phys.
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Ion chambers under-respond and many diodes drift at high dose-per-pulse. What changes when the detector integrates one pulse at a time at 50 nGy resolution?
Read thisMedical PhysicistOne phantom — TG-218 patient QA and TG-142 machine QA
Departments routinely run separate equipment for patient-specific QA and routine machine QA. What changes when the same 1,069-detector array runs both workflows under one software ecosystem?
Read thisReady to bring Delta4 to your department?
Contact Saxsons Group for pricing, demo scheduling, AERB import documentation and installation support.