OCTAVIUS^® Detector 1600 MR

Array Detector for Patient Plan Verification and Quality Control of SRS Applications at MR-Linacs

This flat-panel ionization chamber array can be easily set up on the treatment couch. Combined with the OCTAVIUS 4D MR system, it provides a complete solution for 3D patient-specific plan verification. With a detector density and resolution perfectly adapted to the application, that dedicated MR-conditional OCTAVIUS array detector allows very reliable and accurate measurements of the dose delivered.

Key Features

Array detector with 1521 liquid-filled ionization chambers
Active volume 2.5 x 2.5 x 0.5 mm³ per chamber
Best available field coverage for SRS applications with a field size of 15 x 15 cm²

Detector spacing in central area: 2.5 mm
Filmless patient plan verification and machine-specific QA
Suitable for use with the OCTAVIUS 4D MR – the modular QA phantom

Best Available Field Coverage for MR Applications

OCTAVIUS Detector 1600 MR is an advanced detector array designed for patient plan verification and quality control in Stereotactic Radiosurgery applications using MR-Linacs

Multiple brain metastases:

Suitable for the OCTAVIUS 4D MR: Verification of stereotactic target volumes in the entire phantom volume

Gold standard ionization chambers:

Long lifetime
Stable and reliable signal independent from accumulated dose
No on-site recalibration
Good field coverage
Nearly water-equivalent

Largest SRS detector array with a well-established system:

Perfect field size for Single-Isocenter Multiple-Target Plans

Only one measurement for all PTVs: a time saving workflow
Coverage of all clinical relevant regions

High spatial resolution:

2,5 mm center to center

An Optimal Solution for SRS Treatments

Unique detector properties

With its very small detector size, OCTAVIUS Detector 1600 MR is perfectly suited for the dosimetry of small fields.

Detector Features

Advancement of well-established OCTAVIUS Detector 1600 SRS
1521 liquid-filled ionization chambers with an active volume
of 2.5 x 2.5 x 0.5 mm³ (0.003 cm³)
Enlarged active detector area with 15 x 15 cm²
729 ionization chambers in enlarged high-resolution inner area
of 6.5 x 6.5 cm²
Spatial resolution 2.5 mm in inner area
Excellent error detection for all stereotactic treatment plans

Optimal size for multi target SRS treatments

Stereotactic treatments require high radiological and, most importantly, spatial precision which should be checked for each patient individually.
Due to its high spatial resolution (2.5 mm) and its large detector area of 15 x 15 cm² OCTAVIUS Detector 1600 MR allows patient specific QA of SRS treatments.

Recently TPS and linac manufacturers introduced new solutions for efficient planning of SRS treatments of multiple target volumes with a single isocenter. These applications often include multiple widely-spaced target volumes easily covered with the large detector area of 15 x 15 cm².

OCTAVIUS Detector 1600 MR: multi target SRS treatments — Please click to enlarge

Commissioning of SRS/SBRT techniques

PTW OCTAVIUS detectors have proven to be accurate tools for planar dose measurements.

Especially for radiotherapy departments implementing SRS/SBRT delivery techniques into their clinical practice, OCTAVIUS Detector 1600 MR can support and facilitate the commissioning process.

Technical Specifications

Type of product:	Two-dimensional array with 1521 liquid-filled ionization chambers
Application:	Patient plan verification
MR-conditional up to 1.5 T:	yes
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 420 mm x 22 mm (W x D x H)
Weight:	5.9 kg