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High Precision

High Efficiency

Patient Safety

Sentinel 4DCT - The New Benchmark in 4DCT

CT Simulation is increasingly becoming the standard procedure in radiation therapy. But patient breathing, as well as movements of the tumor or normal tissue can impact planning, delivery and verification. With a normal CT scan, motion may cause inaccurate target definition, in that moving targets could be in distorted shapes at the wrong location. It could also cause extra dose distribution to healthy tissue, due to dosing larger fields to cover a moving tumor.

To improve the visualization of moving tumors, 4DCT is applied to determine the motion and help to design an accurate plan for employing precise standard or gated therapy.

C-RAD Sentinel 4DCT is an easy-to-use, laser-based optical surface scanning system with functionality for 4DCT reconstruction and gated imaging in a CT room. It also provides reference images for patient positioning and intra-fraction motion detection in a radiation therapy treatment room.

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Benefits & features

Full 4D CT capability

  • Breath-hold, deep inspiration and coached/free breathing modes are all supported, along with retrospective and prospective modes. This provides maximum flexibility to adapt to different patient capabilities and clinical requirements.
  • Patient baseline is calculated as an absolute parameter that can be used during the treatment delivery
  • The system offers seamless support throughout the entire 4D CT simulation, 4D treatment planning, and 4D delivery phases of the radiation therapy process

High level of patient safety and comfort

  • No markers or other equipment need to be placed on or around the patient.
  • Laser tracking system in the CT room for getting couch movement automatically
  • Audio-visual coaching through in-room speakers and video goggles, assisting the patient to follow the optimal breathing pattern.

Sophisticated software to streamline the workflow

  • All data acquired by Sentinel is stored in a central database and the same surface points and breathing curve will be automatically tracked with a Catalyst™ system in the treatment room during every fraction, without manual intervention.

Selected specifications


  • CT Interfaces: Integration with major oncology CT models


  • Measurement reproducibility: 0.2 mm
  • Long term stability: Within 0.3 mm

Want to know more about Sentinel 4DCT?

Support services available

Our knowledgeable and experienced C-RAD Services team is here for you during the entire lifetime of the systems. We guide you from installation and clinical implementation, through preventive maintenance, support and continuous software upgrades.

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More information on Clinical Usage

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