I M R T Q A

Smarter Moves in IMRT QA

More detectorsBetter resolutionBest field coverage

When design makes the difference in IMRT QA.

With detector density and field coverage nearly doubled, the new OCTAVIUS® 1500 detector array will help you stay ahead of the game in IMRT QA.

The Checkerboard Detector For patient and machine QA For multiple delivery techniques For OCTAVIUS® 2D and 4D

Highlights

OCTAVIUS 1500: Patient plan verification with VeriSoft®, machine QA with MultiCheck®

Detector density and resolution nearly doubled – 1405 vented ionization chambers, arranged in a unique checkerboard pattern on a 27 cm x 27 cm field

Largest field coverage of available arrays

100% field coverage with two measure- ments via simple couch shift

Gold Standard ionization chambers as detectors – no ageing, no degradation

Dose rate up to 48 Gy/min – suitable for FF and FFF beams

Machine QA with FFF analysis using optional MultiCheck software

For use with OCTAVIUS 2D and 4D QA devices

The OD1500 array’s dosimetric characteristics make it well suited for daily clinical use. Stability and interchamber sensitivity are well below 0.2% and 0.7% respectively. The linearity of the array is excel-lent, since deviations are below 1% from 5 to 1000 MU.

T.S. Stelljes, Medical Physicist, Carl-von-Ossietzky University and Pius Hospital Oldenburg, Germany

Cutting-Edge Detector Technology

In IMRT and IMAT QA, large field coverage is of greater importance than detector size, since it significantly increases the chance of detecting a hot spot or measuring dose at steep gradients.

With the best field coverage of available arrays combined with a very good spatial resolution, the new ionization chamber array OCTAVIUS 1500 provides you with the most complete and accurate picture of the dose delivered to the patient.

Largest field coverage – better detection of hot spots

Fig. 1 Fig. 2 Fig. 3

Simplified illustration showing maximum field coverage achieved by OCTAVIUS 1500 with a single measurement (Fig. 1) and two measurements via simple couch shift (Fig. 2)

compared to diode array of the same detector spacing (Fig. 3), even though the actual information is one dose value per single detector for both array types.

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Accumulated dose

Air-filled ionization chamber or microDiamond

Diode P or E

Diode SRS

The Ion Chamber Advantage: No ageing, no degradation

Contrary to silicon diodes, which change their response with accumulated dose, ionization chambers are known for their outstanding stabil-ity. They are factory-calibrated once and remain stable whereas silicon diodes must be regularly calibrated by the user to ensure accurate dose measurements over time.

Fig. Response degradation of silicon diodes compared to an ionization chamber or microDiamond detector

Specifications

Solutions and Options

WWW.PTW.DE

OCTAVIUS® Detector 1500 Product type: Two-dimensional ionization chamber array with checkerboard detector layoutApplication: Patient- and machine-specific quality assurance in radiation therapy Detector type: Plane-parallel vented ionization chambersNumber of detectors: 1405Detector size: 4.4 mm x 4.4 mm x 3 mm (0.06 cm³)Detector spacing: 7.1 mm center-to-centerMax. field size: 27 cm x 27 cmReproducibility: ≤± 0.5%Repetition rate: 100 msMeasured quantities: Absorbed dose to water (Gy), absorbed dose rate to water (Gy/min)Resolution: 0.1 mGy, 0.1 mGy/minDead time: zeroMeasurement range: (0.5 ... 48) Gy/minReference point: 7.5 mm below the surface of the arrayHousing material: PMMA, GRP (frame)Dimensions: 30 cm x 46.7 cm x 2.2 cm (W x D x H)Weight: 6 kgPower supply: (100 ... 265) VAC; (50 ... 60) HzPC connection: Ethernet, RS232 Extent of supply: OCTAVIUS® Detector 1500, Detector Interface 4000Part No.: L981382

OCTAVIUS® 4D 1500

Turnkey solution for 4D patient plan verification in IMRT, IMAT, RapidArc®, VMATIncludes rotating OCTAVIUS 4D phantom with wireless inclinometer, OCTAVIUS 1500 detector, trolley and VeriSoft software. Part No. L981438

OCTAVIUS® 2D 1500

Turnkey solution for 2D patient plan verification in IMRT, IMAT, TomoTherapy®, RapidArc®, VMATIncludes octagonal OCTAVIUS 2D phantom, OCTAVIUS 1500 detector and VeriSoft software. Part No. L981450

LINAC QA for OCTAVIUS®

LINAC QA upgrade package for OCTAVIUS detectors Includes MultiCheck software, BeamAdjust software and BQ-Check phantom. Part No. L981295

OCTAVIUS® 4D 1500 – ready to use

D913.139.02/00 2014-07

With OCTAVIUS® 4D 1500, IMRT QA is advancing into a new dimension of patient safety and clinical efficiency.

Turnkey Solution for 4D Patient and Machine QA IMRT, IMAT, RapidArc®, VMAT, SRS/SBRT, FF/FFF

Smart detector meets smart phantom.

Fig. 1: Most measurement points, including the isocenter OCTAVIUS 4D (right) compared to other dosimetry systems which measure either outside the target volume in the low dose area (left) or far fewer measurement planes (center).

Fig. 2: True isotropic geometry Isotropic OCTAVIUS 4D (right) compared to other dosi-metry systems (left, center) where inclined beam vectors result in a varying angular response of the diodes.

Rotating the OCTAVIUS 1500 detector array synchronously with the gantry, OCTAVIUS 4D measures the dose inside the entire phantom volume, always perpendicular to the beam.

It requires no angular corrections or frequent user calibrations for long-term dosimetric ac-curacy. One thing less for you to worry about.

Unlike other systems, OCTAVIUS 4D calculates the 3D dose and patient DVHs based on truly measured data, entirely independent of the treatment planning system (TPS).

With 1405 ionization chambers laid out in a unique checkerboard pattern, OCTAVIUS 4D 1500 provides the highest detector density and largest field coverage of comparative 4D QA devices.

As a modular system, it can be used with various detector arrays. Enhance or simply upgrade to the next-generation PTW detector as and when needed.

Used with optional MultiCheck software, OCTAVIUS 4D allows you to check key beam parameters at different gantry angles with one single measurement, without the need for gantry mounts.

Why you should use it for IMRT QA

Select from a wide range of standard and advanced dose comparison and evaluation tools:

Profile and dose distribution overlays

Dose-difference distributions

Results summary with “traffic light” indicator

Gamma histograms

2D/3D Gamma index analysis

3D volume analysis

Patient CT overlay

Independent DVH calculation

Measure the dose with OCTAVIUS and verify it against the TPS quickly and efficiently with feature-rich, intuitive VeriSoft patient plan verifi-cation software.

Calculate patient dose-volume histograms (DVHs) for selected structures in less than a few minutes and compare them with the DVHs calculated by the TPS using optional DVH 4D for VeriSoft.

Unlike other QA devices, which require TPS dose data for DVH calculation, DVH 4D performs its calculations truly independently from the TPS, entirely based on OCTAVIUS 4D measurement data and the patient’s anatomy, using density values from the patient’s CT scan.

Does it agree or not?

Patient Plan Verification with VeriSoft®