Isocenter Verification System for LINAC Gantry

Product Specifications

Technical details and manufacturing context for Isocenter Verification System

Definition

The Isocenter Verification System is a critical component of the Linear Accelerator (LINAC) Gantry responsible for ensuring the geometric accuracy of the radiation treatment beam. It continuously monitors and verifies that the mechanical rotation axis of the gantry, the collimator, and the treatment couch all intersect at a single, stable point in space known as the isocenter. This verification is essential for delivering precise and accurate radiation therapy to tumor targets while minimizing dose to surrounding healthy tissues. The system typically uses a combination of high-precision sensors (such as optical cameras, lasers, or electronic distance measurement devices) and reflective or active targets mounted on the gantry's rotating assembly. As the gantry rotates, the system measures the position of these targets relative to a fixed reference frame. Sophisticated software algorithms analyze this positional data to calculate the actual path of the radiation source and detect any deviations from the ideal isocenter location, providing real-time feedback for calibration or triggering safety interlocks. The system is designed for full gantry rotation coverage (0–360°) and offers positioning accuracy of ±0.1 mm, repeatability of ±0.05 mm, and resolution of 0.01 mm. It operates within a temperature range of 10–40 °C and relative humidity of 20–80% (non-condensing). The power supply is 100–240 V AC (50/60 Hz auto-switching) with a maximum power consumption of 50 W. The ingress protection rating is IP54 per IEC 60529. The system weighs 15–25 kg and has dimensions of 300×200×150 mm (L×W×H). The housing is made of aluminum alloy (Aluminum 6061 per ASTM B209), with stainless steel for mounting brackets and targets, optical glass for lenses and mirrors, and electronic components including PCBs, sensors, and connectors. These specifications are reference values; verify model-specific details with the legal manufacturer or supplier.

Working Principle

The system uses high-precision sensors (optical cameras, lasers, or electronic distance measurement devices) and reflective or active targets mounted on the gantry's rotating assembly. As the gantry rotates, the sensors measure target positions relative to a fixed reference frame. Software algorithms analyze the positional data to calculate the actual path of the radiation source and detect deviations from the ideal isocenter. Real-time feedback is provided for calibration or to trigger safety interlocks.

Common Materials

Aluminum Alloy (for housing), Stainless Steel (for mounting brackets and targets), Optical Glass (for lenses and mirrors), Electronic Components (PCBs, sensors, connectors)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Measurement Range	0–360 °	Full gantry rotation coverage
Positioning Accuracy	±0.1 mm	Critical for isocenter verification
Repeatability	±0.05 mm	Ensures consistent measurements
Resolution	0.01 mm	High resolution for fine adjustments
Operating Temperature	10–40 °C	Outside this range accuracy may degrade
Relative Humidity	20–80 % RH	Non-condensing
Power Supply	100–240 V AC	50/60 Hz auto-switching
Power Consumption	≤50 W	Low power for continuous operation
Ingress Protection	IP54	Dust and splash water protectedIEC 60529
Weight	15–25 kg	Portable for easy setup
Dimensions (L×W×H)	300×200×150 mm	Compact footprint
Material	Aluminum 6061	Lightweight and corrosion-resistantASTM B209

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Target Mounting Assembly
Holds the reflective or active target(s) that define the reference points for optical or electronic measurement by the system's sensors.

Material: Stainless Steel
Optical Sensor Array / Electronic Distance Measurement (EDM) Unit
The primary sensing component that captures the position of the targets. An optical system uses cameras and lasers, while an EDM system uses radio or microwave signals.

Material: Aluminum Alloy, Optical Glass, Electronic Components
Data Acquisition and Processing Module
Converts raw sensor signals into digital data and runs algorithms to calculate the actual beam path and isocenter position, comparing it to the ideal.

Material: Electronic Components (PCBs, processors)
Interface and Communication Board
Provides the electrical and data interface to the main LINAC control system, transmitting verification results, status, and error signals.

Material: Electronic Components (PCBs, connectors)
Reflective or Active Targets
The marks the sensors actually measure; the mounting assembly only holds them.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Linear Accelerator (LINAC) Gantry

View system integration details

Manufacturers of Isocenter Verification System

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Frequently Asked Questions

What is the primary function of the Isocenter Verification System?

It verifies that the mechanical rotation axes of the gantry, collimator, and treatment couch intersect at a single stable point (isocenter) to ensure accurate radiation delivery.

What are the key performance specifications?

The system offers a measurement range of 0–360°, positioning accuracy of ±0.1 mm, repeatability of ±0.05 mm, and resolution of 0.01 mm. Operating temperature is 10–40 °C, and relative humidity is 20–80% non-condensing.

What materials are used in construction?

The housing is aluminum alloy (Aluminum 6061 per ASTM B209), with stainless steel for brackets and targets, optical glass for lenses, and electronic components including PCBs and sensors.

How should the system be maintained?

Regular calibration checks are recommended. Monitor for deviations in measurements, ensure sensors are clean, and verify environmental conditions stay within specified ranges. Consult the manufacturer for service intervals.

Data Basis

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pressure:	Atmospheric pressure only (non-pressurized system)
other spec:	Relative humidity: 30% to 70% non-condensing, Vibration: <0.5g RMS, Power: 100-240V AC, 50/60Hz
temperature:	15°C to 35°C (operating), -10°C to 50°C (storage)

Isocenter Verification System

Product Specifications

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