Gantry Frame / Structure for LINAC Systems | Industrial Component Directory

Product Specifications

Technical details and manufacturing context for Gantry Frame / Structure

Definition

The Gantry Frame/Structure is the foundational mechanical component of a Linear Accelerator (LINAC) gantry, providing the robust, precision-engineered framework that enables the gantry's 360-degree rotation around the patient. It serves as the primary load-bearing structure, supporting the weight of critical subsystems including the radiation source (accelerating waveguide or bending magnet assembly), beam collimation systems (MLC), imaging devices (kV/MV imagers), and patient positioning lasers. Its design ensures mechanical stability, vibration damping, and precise alignment under dynamic rotational forces, which is critical for accurate radiation beam delivery in radiotherapy.

Constructed from high-strength steel alloy and precision-cast iron components, the frame is engineered to meet stringent mechanical tolerances. The load capacity ranges from 5000 to 15000 kg, accommodating the weight of the LINAC and patient table. The gantry aperture diameter of 70–90 cm allows for patient and imaging system clearance. Positioning accuracy is maintained within ±0.5 mm (ISO 230-2), ensuring precise beam targeting. Rotational speeds of 0.5–6 rpm support dynamic treatments like VMAT. Material grades Q235B–Q345B (GB/T 1591) provide structural strength and weldability. Surface treatment to Sa2.5 (ISO 8501-1) ensures corrosion resistance. Operating temperature ranges from 10–40 °C, humidity 20–80% RH (IEC 60721-3-3), and ingress protection IP54–IP65 (IEC 60529). The frame weighs 8000–20000 kg, with a footprint of 3.5–5.5 m², and power consumption of 5–15 kW for motors and control systems.

As a directory listing, these values are reference ranges; actual specifications must be confirmed with the legal manufacturer for specific models. The frame's design and materials are critical to the safe and accurate operation of the LINAC system.

Working Principle

The frame acts as a stable, rotating platform. Driven by a high-precision motor and bearing system, it rotates the entire mounted LINAC assembly around a fixed isocenter. Its structural rigidity maintains the precise spatial relationships between all mounted components (e.g., radiation source to collimator) during rotation, ensuring the radiation beam always converges at the treatment isocenter regardless of gantry angle. This allows for multi-angle radiation delivery while the patient remains stationary.

Common Materials

High-strength steel alloy, Precision-cast iron components

Technical Parameters

Parameter	Typical range	Notes & selection driver
Load Capacity	5000–15000 kg	Includes weight of LINAC and patient table.
Gantry Aperture Diameter	70–90 cm	Must accommodate patient and imaging systems.
Positioning Accuracy	±0.5 mm	Ensures precise beam targeting.ISO 230-2
Rotational Speed	0.5–6 rpm	For dynamic treatments like VMAT.
Material Grade	Q235B–Q345B	Structural steel with high strength and weldability.GB/T 1591
Surface Treatment	Sa2.5	Blast cleaning before painting for corrosion resistance.ISO 8501-1
Operating Temperature	10–40 °C	Outside range affects electronics and mechanical tolerances.
Humidity Range	20–80 % RH	Non-condensing to prevent corrosion and electrical faults.IEC 60721-3-3
Ingress Protection	IP54–IP65	Protects against dust and water jets.IEC 60529
Weight	8000–20000 kg	Affects floor loading and installation requirements.
Footprint	3.5–5.5 m²	Includes clearance for rotation and patient access.
Power Consumption	5–15 kW	For motors and control systems.

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

Main Structural Rings Part
Form the primary circular load-bearing elements of the rotating frame.

Material: High-strength steel alloy
Radial Support Beams/Spokes Part
Connect the central hub to the outer rings, providing torsional stiffness and distributing loads.

Material: Steel alloy
Mounting Interfaces/Plates Part
Precision-machined surfaces for attaching the LINAC head, imaging systems, and other subsystems.

Material: Steel, often with ground surfaces
Bearing Race Integration Part
Integrated or attached surface that interfaces with the large-diameter rotational bearing system.

Material: Hardened steel
Main Structural Beams Part
Primary load-bearing members that form the ring or arc of the gantry, transferring loads to the rotation bearing.

Material: High-strength steel alloy
Reinforcement Ribs/Gussets Part
Structural elements added to critical junctions to increase rigidity and prevent torsional flexing.

Material: Steel

Applied To / Applications

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

Linear Accelerator (LINAC) Gantry

View system integration details

Manufacturers of Gantry Frame / Structure

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Frequently Asked Questions

What is the primary function of the gantry frame?

The gantry frame provides the rigid structural support for the LINAC gantry, enabling precise 360-degree rotation around the patient while maintaining alignment of all mounted components.

What materials are used in the gantry frame?

The frame is typically made from high-strength steel alloy and precision-cast iron components, with material grades such as Q235B–Q345B per GB/T 1591.

What are the key specifications to verify before procurement?

Key specifications include load capacity (5000–15000 kg), gantry aperture diameter (70–90 cm), positioning accuracy (±0.5 mm), rotational speed (0.5–6 rpm), and environmental ratings. Always confirm with the manufacturer for the specific model.

How does the frame ensure beam accuracy during rotation?

The frame's structural rigidity and precision bearings maintain the spatial relationships between the radiation source and collimator, ensuring the beam converges at the isocenter at all gantry angles.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	N/A (structural component, not pressure vessel)
other spec:	Max dynamic load: 5000 kg, Max static load: 8000 kg, Vibration tolerance: ≤ 0.5 mm displacement at 5-100 Hz, Humidity: 30-70% RH non-condensing
temperature:	10°C to 40°C (operational), -20°C to 60°C (storage)

Gantry Frame / Structure

Product Specifications

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