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Modular Solutions for 3D Patient and Machine QA

OCTAVIUS 4D is an ideal system for routine Patient and Machine QA of all major radiotherapy techniques - from conventional step-and-shoot to multiple-arc, non-coplanar treatment plans. With its modular phantom design and a variety of detectors, OCTAVIUS 4D allows you to select the phantom and detector combination that is best for your patient QA needs. Today and tomorrow.


  • One system for Patient and Machine QA
  • 3D dose verification in phantom and patient geometry
  • Rotating phantom - true 3D, true isotropic geometry
  • Modular and scalable – various array detectors and phantom tops
  • Cutting-edge detector technology based on Gold Standard ionization chambers
  • Verification of treatments including non-coplanar beams, off-axis target volumes or very large fields
  • One system for multiple techniques
  • Compatible version for MR linacs available
  • Simplified workflow - from measurement to case-related monitoring of QA results with optional Track-it
  • Water-equivalent phantom material – no density scaling artefacts
  • Extended dose rate range for FFF beams – no separate detectors required
  • Increased field coverage with 3D Merge for better error detection
  • Simple commissioning process
  • Reproducible, quick and easy positioning with the Couchfix Positioning Tool
  • Full range of advanced comparison and analysis tools for a clinically relevant dose analysis
  • Completely independent QA
    OCTAVIUS 4D requires no data input from plan/linac for measurement and 3D dose reconstruction. A simple set of PDDs measured in water - that’s all! Unlike other commercially available systems, it is completely independent of environmental settings. It guarantees maximum reliability in Patient QA procedures.
  • Truly modular
    OCTAVIUS 4D is the only truly modular 4D QA system. It supports a variety of PTW array detectors and phantom tops for efficient patient- and machine-specific quality assurance.This allows matching the measurement setup according to the particular clinical situation. And extends the scope of OCTAVIUS 4D significantly.
  • Unique measurement principle – Fully transparent
    OCTAVIUS 4D measures dose time- and angle-dependent. It ensures perpendicular irradiation of the PTW array detector through synchronous phantom rotation with the linac gantry. It is the only 4D dose verification system which allows measuring the dose. Not only at the isocenter or the phantom’s surface but also inside the entire phantom volume. Without applying any non-transparent response corrections.
  • Minimum commissioning efforts
    Compared to competitor products, OCTAVIUS 4D needs no time-consuming commissioning process. A simple set of PDDs measured in water at different field sizes is the only input. This can either be taken directly from already existing basement data or from freshly performed water phantom measurements.
  • Extended application range

    Besides standard VMAT or IMRT deliveries, OCTAVIUS 4D covers a wide range of clinical applications.
    Special applications too, like:
    - verification of treatment plans with non-coplanar beams
    - verification of large fields
    - verification of extremely off-axis lying target volumes
    - verification of treatment plans with multiple energies

  • Virtually FOV extension
    In some clinical situations the dimension of the target volume cannot completely be covered by the field of view (FOV) of the OCTAVIUS detector. Therefore, with OCTAVIUS 4D very long radiation fields (like in craniospinal treatments) can be verified up to field lengths of even 48 cm using intelligent merging of consecutive dose measurements.
  • Powerful evaluation platform
    OCTAVIUS 4D’s user interface VeriSoft provides powerful 3D dose comparison and evaluation tools like:

    - 3D Gamma analysis
    - DVH analysis in patient anatomy
    - Profile and dose distribution overlays
    - Dose-difference distributions.
    These are necessary to verify IMRT, VMAT or SRS/SBRT treatment plans.

  • Case-related data management
    Connected to PTW’s data management platform Track-it retrospective data analysis and trending of Patient & Machine specific QA data points out performance changes over time.
  • Chamber plates
    Insert plates for single ionization chamber measurements in OCTAVIUS 4D phantom (Semiflex3D, Semiflex 0.125 cm³, Farmer or PinPoint 3D).
    Rotation Unit plate microDiamond, on-axis (T40056.1.008).
  • Starcheck Detector
    The Starcheck array can be positioned in OCTAVIUS 4D for advanced linac QA measurements.
  • Bronze / Silver / Gold Service Contracts for OCTAVIUS 4D

Verifying Treatment Plans with OCTAVIUS 4D:
Watch the Step-by-step Video

How do I set up OCTAVIUS 4D for measurement? How are measurements performed? Which dose comparison tools are available?

The step-by-step video guides you through the entire workflow – from installation to evaluation.

Other available languages:

Powerful Evaluation Tools

3D gamma volume analysis

Gain more confidence in the accuracy of your results by performing a volumetric 3D gamma index analysis that expands the analysis range from a plane to a volume.
By calculating the gamma value for each voxel in the entire phantom volume and providing the results within less than a minute, the unique 3D volume analysis tool takes the commonly used gamma evaluation one step further. It not only improves passing rates, particularly in regions of steep dose gradients, but also significantly increases evaluation efficiency.

Evaluation in patient geometry

Failed points, measured isodoses, contours of the CTV, PTV and organs at risk can be overlaid onto the patient’s CT image, making it easier for you to immediately detect dose errors and identify the possible causes for failures.

DVH 4D analysis

Optimize your treatment plan based on additional, independently acquired dose data.
Unlike other QA devices, DVH 4D calculates patient dose-volume histograms truly independently from the TPS. The DVH is entirely based on OCTAVIUS 4D measurement data and the patient’s anatomy. Using density values from the patient’s CT scan.

An Integrated Solution

Track, trend and monitor

Track the quality of your treatment plans to take action when needed. Define and assign classes in VeriSoft, e.g., depending on the treatment type (prostate, H&N, etc.), and export the verification results, along with the project file and graphics, to Track-it for efficient case-related monitoring of your QA data in one place. Simply click on the project file to review your evaluation in VeriSoft.


Introducing a new modular system for independent 3D patient plan verification and Machine QA measurements in MR linacs.

OCTAVIUS 4D MR, with its distinctive modular phantom design and ionization chamber array detectors, stands out as an exceptional option for 3D dose verification and linac QA in MR linacs. By independently measuring the dose within a volume, separate from the treatment planning system, OCTAVIUS 4D MR can identify errors that might otherwise go unnoticed. 

Key Features

  • 3D dose verification in the entire phantom volume
  • Filmless patient plan verification and Machine QA in one system
  • Rotating phantom – true 3D, true isotropic geometry with no necessity of angular corrections
  • Modular and scalable – various array detectors and phantom tops
  • Easy workflow for off-axis treatment plan verification
  • Supported by the measurement and evaluation softwares VeriSoft and BeamAdjust
  • Fully integrated with Track-it for automated reporting

OCTAVIUS 4D Components

Motorized modular phantom specially designed for rotational delivery techniques. Includes control unit and wireless inclinometer for dose measurements as a function of time or gantry angle.

OCTAVIUS 4D includes either of the following tops to adapt the measurement setup according to the particular treatment scenario:

  • OCTAVIUS top Standard
  • OCTAVIUS top SRS plus
  • OCTAVIUS top linac QA Top


Each array includes a detector interface for power supply and data transfer.

  • OCTAVIUS Detector 1500 for advanced IMRT / VMAT QA with 1405 vented ionization chambers
  • OCTAVIUS Detector 1000 SRS with 977 liquid-filled ionization chambers
  • OCTAVIUS Detector 1600 SRS for patient plan verification and quality control of SRS applications with 1521 liquid-filled ionization chambers

Each array includes detector interface for power supply and data transfer.

  • VeriSoft Patient Plan Verification Software
    Intuitive, workflow-oriented software platform for patient plan verification with PTW OCTAVIUS systems. Offers advanced tools for visual and quantitative dose comparison and evaluation, including 3D volume analysis, independent DVH analysis and connectivity to data-management platform Track-it.
  • OCTAVIUS 4D Trolley
    Robust, functionally designed trolley on wheels which stores all equipment and allows to conveniently position the OCTAVIUS 4D system onto the patient couch, making daily setup as comfortable and easy as possible.


Technical Specifications

Design: Motorized, modular phantom, consisting of rotation unit with four exchangeable tops    
Dimensions: Rotation unit: Diameter 320 mm, length 343 mm
OCTAVIUS top standard: Diameter 320 mm (272 mm x 317 mm x 137.4 mm)
OCTAVIUS top SRS: Diameter 170 mm (272 mm x 317 mm x 61 mm)
OCTAVIUS top SRS plus: Diameter 210 mm (272 mm x 317 mm x 82,4 mm)
OCTAVIUS top linac QA: Effective depth 50 mm (272 mm x 317 mm x 25.6 mm)
Weight: Rotation unit: 20.7 kg    
  OCTAVIUS top standard: 8.9 kg    
  OCTAVIUS top SRS: 2.3 kg    
  OCTAVIUS top SRS plus: 3,7 kg    
  OCTAVIUS top linac QA: 2.2 kg    
Material: Polystyrene    
Density: 1.05 g/cm³    
Angle range: ± 360°    
Rotation speed: max. 28°/s (rotation unit)    
Positioning reproducibility: ± 1°    
Type of product: Two-dimensional array with 1521 liquid-filled ionization chambers
Application: IMRT patient plan verification (include VMAT)
Machine-specific QA
Online beam adjustment
Measuring quantities: Absorbed rate and absorbed dose
Range of use: (0.1 ... 24) Gy/min
Resolution: 0.1 mGy, 0.1 Gy/min
Dead time: Zero
Display cycle: (100 ... 800) ms
Type of detectors: Plane-parallel, liquid-filled ionization chambers
Detector layout: Center area (6.5 cm x 6.5 cm): spacing 2.5 mm
Outer area (15 cm x 15 cm): spacing 5 mm
Nominal response: 16 nC/Gy
Size of detectors: 2.5 mm x 2.5 mm x 0.5 mm (0.003 cm³)
Active detector area: 15 cm x 15 cm
Outer dimensions: 300 mm x 467 mm x 22 mm (W x D x H)
Weight: 5.9 kg
Detector type: Plane-parallel vented ionization chambers
Number of detectors: 1405
Detector size: 4.4 mm x 4.4 mm x 3 mm
(0.06 cm³)
Detector spacing: 7.1 mm center-to-center
Max. field size: 27 cm x 27 cm
Max. measurement points: 2916 (four measurements)
Reproducibility: ≤ ± 0.5%
Dead time: zero
Repetition rate: 100 ms
Measured quantities: absorbed dose to water (Gy),
absorbed dose rate to water (Gy/min)
Resolution: 0.1 mGy or 0.1 mGy/min
Measurement range: (0.5 ... 48 Gy/min)
Reference point: 7.5 mm below the surface of the array
Housing material: PS, GRP (frame)
Dimensions: 467mm x 300mm x 22mm (H x W x D)
Weight: 6 kg
Power supply: (100 ... 240) VAC; (50 ... 60) Hz
PC connection: Ethernet
Part No.: L981382
Detector type: Liquid-filled ionization chambers
Number of detectors: 977
Detector size: 2.5mm x 2.5mm x 0.5mm
(0.003 cm³)
Detector spacing: Center area (5.5 cm x 5.5 cm): 2.5 mm center-to-center
Outer area (11 cm x 11 cm): 5 mm center-to-center
Max. field size: 11 cm x 11 cm
Reproducibility: ≤ ± 0.5%
Dead time: zero
Repetition rate: 100 ms
Measured quantities: Absorbed dose to water (Gy),
Absorbed dose rate to water (Gy/min)
Resolution: Dose: 0.1 mGy, Dose rate: 0.1 mGy/min
Measurement range: 0.2 ... 36 Gy/min
Reference point: 9 mm below the surface of the array
Housing material: GRP
Dimensions: 22mm x 300mm x 420mm (H x W x D)
Weight: 5.4 kg
Power supply: (100 ... 240) VAC; (50 ... 60) Hz
PC connection: Ethernet
Part No.: L981381
Dimensions: 93.6 cm x 64 cm x 60 cm, height of lifting plate: 85.5 cm
Weight: 35.5 kg
Part No.: T40057
Operating system: Microsoft® Windows®
(Windows 7 Professional x32/x64,
Windows 8 Professional x32/x64,
Windows 10 Pro x32/x64)
Processor: multi-core processor, 2.3 GHz or better
Memory (RAM): min. 4 GB, 8 GB recommended
Hard disk: min. 500 MB of free space for application software and 1.5 GB of free space for .NET Framework 2.0, 3.5 and 4.0+
Screen resolution: 1280 x 1024 or higher
Interfaces: Network interface
Other: Windows® Internet Explorer® 8.0 or higher, Adobe® Reader® 7.0 or higher
Part No.: S070009

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