Sub-Millimetre Tracking.
Added to Your Existing Linac.
The Raypilot® System delivers electromagnetic real-time tracking at 30 Hz without imaging dose, with a P95 radial accuracy. And, it normally installs in just two days with zero clinical downtime.
Core Technology
30 Hz Continuous
Continuous 3D position data with no imaging dose or beam interruption.
P95 < 2 mm
95th-percentile radial error, verified using an optical reference system.
Electromagnetic, Less Invasive
Electromagnetic transmitter. No implanted markers or external imaging.
Redundant Position Estimation
6 independent antenna blocks, each estimating position separately, enabling the system to detect and compensate for individual sensor disturbance.
Large Number of Data Points
The signal model trains on tens of thousands measurement points collected in each clinical environment, adapting to room-specific electromagnetic conditions without manual calibration.
Continuously Verified MQ
Every position estimate carries a reliability score, computed in real time. The system continuously monitors its own accuracy and adapts to maintain it throughout every treatment session.
Real-Time Variable Gain
Transmitter signal parameters are adjusted automatically during treatment to optimise antenna response and maintain measurement accuracy, even during active beam delivery.
Pitch & Yaw
Full orientation data is displayed in real time alongside translational position, giving the treatment team a complete picture of prostate motion during each session.
The Five Dimensions of Treatment Precision
The quality of a prostate SBRT delivery depends on how well you control five interrelated parameters. The Raypilot® System directly addresses the dimensions that are typically the weakest in conventional setups.
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1. Target margins
Real-time tracking allows minimized CTV to PTV margins.
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2. OAR margins
In order to ensure that organs at risk are protected, the urethra visualisation enables dose-sparing where it matters most.
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3. Delivered dose fidelity
In order to ensure that the delivered dose matches the planed dose, a continuous position verification ensures the plan executes as intended.
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4. Intrafraction motion control
Continuous tracking ensures that radiation is delivered accurately and according to plan. If the prostate moves outside the predefined margins, the user can stop the beam reposition the patient.
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5. Cumulative imaging dose
Position tracking with Raypilot System is performed without ionizing radiation.
Conventional SBRT without intrafraction motion management compensates primarily through wider margins (1, 2) and accepts geometric uncertainty during delivery (4). The Raypilot® System addresses all five dimensions simultaneously.
How Electromagnetic Tracking Works with the Raypilot® System
From Signal to Position
The Raypilot® Hypocath contains a miniaturised electromagnetic transmitter housed in a dedicated catheter lumen. The transmitter emits a signal detected by the Raypilot® Receiver, an antenna array on the treatment couch, 30 times per second. The signal is processed through a model that resolves the transmitter’s position in 3D with sub-millimetre precision. Unlike image-based tracking (CBCT, MRI), electromagnetic tracking provides continuous position data without radiation exposure to the patient and without pausing the treatment beam for imaging acquisition.
Fewer Fractions, Lower Cumulative Imaging Dose
Every treatment fraction requires pre-treatment verification imaging (CBCT or MRI), which delivers additional radiation dose to surrounding healthy tissue. Over a conventional 20–39 fraction course, this cumulative imaging dose to organs at risk becomes clinically relevant. By enabling confident delivery in 1–5 fractions with continuous electromagnetic real-time tracking, The Raypilot® System substantially reduces the total number of verification exposures and the associated imaging dose to rectum, bladder, and other organs at risk.
Tracking Methods Compared
| EM tracking (Raypilot) | kV imaging | MR imaging | |
|---|---|---|---|
| Temporal resolution | 30 Hz (continuous) | Intermittent (pre/post) | ~4 Hz (cine MR) |
| Imaging dose to patient | Zero | Additional dose | Zero |
| Beam interruption | Not required | Required for imaging | Not required |
| Implanted markers | Not required | Typically required | Not required |
| Soft tissue visualisation | Urethra (via catheter) | Limited | Full soft-tissue contrast |
Signal Processing and the Raypilot® Signal Model
The Raypilot® System uses a model-based signal processing architecture to resolve the electromagnetic signal from the Raypilot® Hypocath transmitter into a precise 3D position. The model is trained on a large number of measurement points collected during a ~12-hour calibration cycle, mapping antenna responses to transmitter positions.
Redundant Position Estimation
Position estimated independently across antenna blocks. The most probable position is derived from consensus across elements, providing built-in robustness against individual sensor disturbance.
Measurement Quality (MQ)
A continuously computed measurement quality indicator reports the reliability of each position estimate. If the system is exposed to disturbances the system adapts transmitter signal parameters to optimize quality, at all times.
Data Available After Every Session
Every treatment session generates a complete motion record that is stored automatically and available for review. All data is exportable for retrospective analysis and QA integration.
3D Position Trace
Continuous position data in lateral, longitudinal, and vertical directions.
Pitch & Yaw
Rotational orientation data tracked alongside translational position.
Data Export
Full dataset available for offline analysis and quality assurance review.
Dosimetric Impact of Intrafraction Motion
View all publicationsElectromagnetic transmitter-based prostate gating for dose-escalated SBRT
Evaluates intrafraction motion magnitude and gating frequency using The Raypilot System's EM tracking. Reports the proportion of fractions where gating was triggered and the clinical impact.
Why it matters: Adipiscing massa magna massa pellentesque facilisis elit laoreet. Non in vitae feugiat adipiscing nullam maecenas sit. Quam a aliquam sed leo eu.
Read our summaryInstallation and QA Integration
The Raypilot® System installs as an add-on to your existing linear accelerator, with no re-build installation, shielding, or cooling required. The Receiver attaches to the couch with standard index bars.
Hardware & Calibration
Receiver, software, acceptance testing. Unpacking and installation.
Clinical Integration
Workflow setup, staff training, phantom validation. Commissioning test with user and initial training.
Clinical Start
Training in bunker.
Multi-room configuration
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Scaling to Multiple Rooms
One Receiver per treatment room, shared software infrastructure. Additional rooms added with minimal incremental cost and no disruption to existing installations.
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QA Workflow Integration
Reproducible bladder filling and catheter positioning ensure each treatment session matches the plan.
Downloads
View all downloadsThe Raypilot® System Flyer
An overview of The Raypilot® System for intrafraction motion management, featuring system components, key clinical benefits, and references from treating clinicians.
Download Raypilot System FlyerThe Raypilot® System Technical Flyer
Technical specifications for The Raypilot® System, including receiver dimensions, catheter specifications, position update performance, and measurement precision data.
Download Raypilot System Technical FlyerThe Raypilot® System Folder
An introduction to prostate cancer treatment with The Raypilot® System, including how the system works, the step-by-step treatment process, and patient experience.
Download Raypilot System FolderFrequently Asked Questions
View all FAQs-
How does the system integrate with existing QA protocols?
Raypilot® System has a separate QA assessment that needs to be performed before using the system.
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Is The Raypilot® System compatible with my linac?
The Raypilot® System works with most linacs. Feel free to reach out to us if you are wondering about your linac at info@micropos.se.
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What calibration is needed after installation?
The only calibration/verification needed is the daily Quality Control.
Want to See the System in Detail?
Request a technical demonstration, review the full specification sheet, or connect with our engineering team to discuss how The Raypilot® System integrates with your linac and clinical workflow.