Catalyst optical surface scanning and re-projection


Catalyst optical surface scanning and re-projection


Revolution in 4D Treatment

Recent advances in treatment planning and delivery systems have led to consistently achieving optimal results. And now with the revolutionary Catalyst, you can get the same level of confidence when controlling the only remaining variable – the patient.

During treatment, patient breathing, as well as movements of the tumor or normal tissue can impact the clinical result and by missing targets or causing extra dose distribution to normal tissue.

The Catalyst system is a revolutionary solution for Surface Image Guided Radiation Therapy (SIGRT), coupled with application software optimized for work-flow integration.

Catalyst offers a complete solution on 3D CRT, IMRT for online patient tracking before and during treatment delivery, thus ensuring the best possible therapeutic and palliative treatment outcome without non-prescribed doses. c4D software is integrated with major radiation therapy equipment suppliers to streamline workflow, including beam and couch control.

In the treatment room, the system provides the following benefits compared to other SIGRT solutions:

Full 4D SIGRT Solution

  • Catalyst has integrated into the whole 4D treatment workflow, from Setup and Positioning to Intra-Fraction Motion Monitoring to Respiratory Gating Treatment
  • During the treatment, the patient is constantly under surveillance by Catalyst
  • Large patient surface coverage (1300x800x700mm)
  • Interactive visual guidance via colour map projected on patient body during setup
  • Correct any posture or positioning errors immediately
  • Auto couch correction in setup
  • Any patient movements above tolerance levels immediately trigger beam hold
  • Respiratory gating
  • Absolute value calculation with baseline monitoring capability
  • Tracking of both thoracic and abdominal respiratory motion in parallel
  • Breath-hold, deep inspiration and coached/free breathing modes are all supported
  • Optional audio-visual coaching helps the patient follow optimal breathing patterns. Patient baseline is calculated as an absolute parameter that can be used during treatment delivery

High level of patient safety and user confidence

  • No markers on or around the patient
  • Dose-free motion management
  • Auto patient data retrieval
  • Tracking of both thoracic and abdominal respiratory motion in parallel with virtual monitoring
  • Optional audio-visual coaching through in-room speakers and video solution, assisting the patient to follow the optimal breathing pattern

Sophisticated software to streamline the workflow

  • Catalyst can retrieve all data acquired by Sentinel, which is stored in a central database, and the same surface points and breathing curve will be automatically tracked in the treatment room during every fraction, without manual intervention
  • Multi-vendor interfaces have been developed to ensure a seamless clinical workflow, i.e. Varian TrueBeam, C-series; Elekta VersaHD, Infinity, Synergy

Increasing productivity without compromising treatment quality

  • Non-rigid algorithm improves accuracy and speed of clinical application
  • Reduces the dose on heart and lung during DIBH treatment for left breast cancer and lymphoma
  • Potential to improve quality and speed of the positioning process, for example, extremity sarcoma
  • Highly integrated QA/QC procedure – Daily QC within 5 minutes
  • Potential to reduce the frequency of other IGRT technologies

Selected specifications

Light projection

  • Wavelengths: 405 nm (near-invisible violet), 528 nm (green), 624 nm (red)


  • Scan volume (X * Y * Z): 800 mm x 1300 mm x 700 mm
  • Measurement reproducibility: 0.2 mm
  • Long term stability: 0.3 mm
  • Warm-up time: 30 minutes
  • Scan speed: Up to 80 complete 3D surfaces per second
  • Registration method: Real-time, non-rigid with deformable models for computing 6 DOF isocentric shifts
  • Positioning accuracy: Within 1 mm for rigid body
  • Motion detection accuracy: Within 1 mm

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