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Radiotherapy linear accelerators operate in highly sensitive medical environments where even minor electromagnetic interference (EMI) can affect system stability and treatment accuracy.
With increasing system complexity and higher power density, ensuring proper electromagnetic compatibility (EMC) is no longer optional—it is critical for both performance and patient safety.
Radiotherapy systems rely on precise signal transmission, stable power control, and accurate dose delivery. Any electromagnetic disturbance can lead to signal distortion, control errors, or system instability.
In critical medical environments, this is not just a performance issue—it directly relates to patient safety.
In radiotherapy systems, EMC is not only a compliance requirement. It directly affects imaging precision, control stability, and treatment safety.
Linear accelerators generate high-voltage pulses and fast switching signals, which can introduce strong electromagnetic emissions.
Control modules, sensors, and communication interfaces are highly sensitive to transient disturbances such as ESD, EFT, and surge.
Power lines, signal lines, and grounding systems interact with each other, making EMC design more complex at the system level.
To ensure stable operation, EMC design must be approached at the system level.
| Protection Area | Risk | Recommended Device | Design Note |
|---|---|---|---|
| AC Power Input | Surge / EFT | MOV + GDT + Filter | Front-end protection, high energy absorption |
| Communication Lines | ESD / Transient | Low-capacitance TVS diode | Maintain signal integrity |
| Sensor Inputs | Noise / Transient | TVS + Ferrite Bead | Reduce signal distortion |
| DC Power Rails | Switching Noise | LC Filter Network | Improve stability and noise immunity |
When selecting protection components, consider:
For medical electronics, long-term reliability and low leakage performance are often more critical than peak surge capability.
Because it ensures system stability, signal accuracy, and patient safety.
TVS diodes, MOVs, GDTs, and filtering networks.
No. They serve different purposes and should be used together.
Through system-level design including layout, grounding, filtering, and protection devices.
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