OCTAVIUS® Detector 1600 MR

Detector array for patient plan verification and quality control of SRS applications at MR-Linacs

  • Detector array with 1521 liquid-filled ionization chambers
  • Filmless patient plan verification and machine-specific QA
  • Suitable for use with the OCTAVIUS I and II systems
  • Active volume 2.5 x 2.5 x 0.5 mm³
  • Detector spacing in center area: 2.5 mm
  • Best available field coverage for SRS applications with a field size of 15 x 15 cm²

Best available field coverage for MR applications

Multiple brain metastases:
Gold standard ionization chambers:
Largest SRS detector array with a well-established system:
High spatial resolution:
Multiple brain metastases:

Verification of single isocenter SRS for multiple brain metastases - one system suitable for QA of IMRT, VMAT and SRS/SBRT

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

Unique Properties - Optimal for SRS Treatments

OCTAVIUS® Detector 1600 MR -
Unique Detector Properties


  • Advancement of well-established OCTAVIUS® Detector 1000 SRS
    with > 50% more chambers
  • 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
  • For filmless patient plan verification and machine specific QA
  • 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 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.

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 1600 MR can support and facilitate the commissioning process.

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
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

Related Downloads

MR-RT Products ( 2 MB )
OCTAVIUS at MRIdian linac ( 2 MB )
Radiation Medicine Catalog ( 9 MB )
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