Editorial Technical Reference

Multi-Leaf Collimator (MLC)

This page explains how Multi-Leaf Collimator (MLC) is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The Multi-Leaf Collimator (MLC) is a critical component of the Integrated Radiotherapy Treatment Planning and Delivery System.

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Multi-Leaf Collimator (MLC) in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Multi-Leaf Collimator (MLC)

Definition
The Multi-Leaf Collimator (MLC) is a critical component of the Integrated Radiotherapy Treatment Planning and Delivery System. It consists of multiple thin tungsten leaves that can be individually positioned to create custom apertures. During treatment, the MLC dynamically shapes the radiation beam to precisely conform to the three-dimensional shape of the tumor while minimizing exposure to surrounding healthy tissues. The leaves are moved by computer-controlled motors based on treatment planning data, blocking portions of the beam to create a shaped aperture that matches the tumor's projection from the beam's eye view. The leaves can move during delivery to adapt to tumor motion or create intensity-modulated fields. Typical configurations include 40 to 120 leaf pairs, with leaf widths at isocenter ranging from 2.5 to 10 mm. The maximum field size is 40×40 cm, and leaf travel range extends ±10 to 20 cm beyond the field edge. Leaf positioning accuracy is ±0.1 to 0.5 mm, and leaf speed ranges from 2 to 5 cm/s. Leaf transmission is 0.5% to 2%, and interleaf leakage is 0.5% to 1.5%. The MLC operates on 24–48 V DC, consumes 50–200 W, and functions within an operating temperature of 10–40 °C and relative humidity of 20%–80% (non-condensing). It has an ingress protection rating of IP54–IP65 per IEC 60529, and weighs 50–150 kg. Materials include tungsten, steel alloys, and copper. These values are directory reference ranges; verify model-specific specifications with the legal manufacturer.
Working Principle
The MLC uses computer-controlled motors to individually position thin tungsten leaves. Based on treatment planning data, each leaf is moved to a specific position to block portions of the radiation beam, creating a shaped aperture that matches the tumor's projection. During treatment, leaves can move dynamically to adapt to tumor motion or to create intensity-modulated fields. The leaves are arranged in pairs, and their precise positioning determines the field shaping resolution. The system's accuracy and speed are critical for delivering the intended dose distribution while sparing healthy tissue.
Common Materials
Tungsten, Steel alloys, Copper
Technical Parameters
ParameterTypical rangeNotes & selection driver
Number of Leaf Pairs40–120 pairsDetermines field shaping resolution.
Leaf Width at Isocenter2.5–10 mmSmaller width improves conformality.
Maximum Field Size40×40 cmLargest square field at isocenter.
Leaf Travel Range±10–20 cmOvershoot beyond field edge.
Leaf Positioning Accuracy±0.1–0.5 mmAffects dose delivery accuracy.
Leaf Speed2–5 cm/sFor IMRT/VMAT efficiency.
Leaf Transmission0.5–2 %Lower is better for leakage.
Interleaf Leakage0.5–1.5 %Max radiation through leaf gaps.
Operating Voltage24–48 V DCStepper motor drive.
Power Consumption50–200 WIncludes motors and control.
Operating Temperature10–40 °CStable performance within range.
Relative Humidity20–80 %Non-condensing.
Ingress ProtectionIP54–IP65Dust and water resistance.IEC 60529
Weight50–150 kgAffects gantry mounting.

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
  • Tungsten leaves Part
    Primary radiation blocking elements that shape the beam
    Material: Tungsten alloy
  • Leaf drive mechanism
    Motorized system that positions individual leaves
    Material: Steel, copper
  • Position sensors
    Monitor and verify leaf positions during treatment
    Material: Electronic components
  • Control electronics
    Process treatment planning data and control leaf movements
    Material: Circuit boards, semiconductors

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric (sealed system, no external pressure rating required)
other spec: Radiation field size: 40x40 cm max, Leaf width: 5-10 mm, Leaf positioning accuracy: ±1 mm, Max leaf speed: 3 cm/s
temperature: 15°C to 35°C (operating), 0°C to 50°C (storage)
Media Compatibility
✓ Medical-grade radiation beams (photons/electrons) ✓ Sterile clinical environments ✓ Precision motion control systems
Unsuitable: High-vibration industrial environments or areas with conductive dust/particulates
Sizing Data Required
  • Maximum radiation field dimensions required (cm)
  • Tumor contour complexity (minimum leaf width needed)
  • Treatment delivery speed requirements (leaf positioning speed)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Leaf Positioning Inaccuracy
Cause: Wear in drive mechanisms (e.g., motors, gears, lead screws), thermal expansion, or calibration drift from repeated high-precision movements and radiation exposure.
Leaf Motor Failure
Cause: Overheating due to high duty cycles, electrical faults from power surges, or mechanical binding leading to excessive current draw and burnout.
Maintenance Indicators
  • Audible grinding or clicking noises during leaf movement, indicating mechanical wear or obstruction.
  • Visual misalignment or gaps between leaves in the closed position, detected during routine quality assurance tests.
Engineering Tips
  • Implement predictive maintenance using vibration analysis and thermal imaging on drive components to detect early wear before failure.
  • Establish strict environmental controls (temperature, humidity) and regular calibration schedules to minimize thermal and positional drift.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 60601-2-1 - Medical electrical equipment - Part 2-1: Particular requirements for the basic safety and essential performance of electron accelerators in the range 1 MeV to 50 MeV CE marking - Medical Devices Regulation (MDR) 2017/745

Quoted from the published standard.

Manufacturing Precision
  • Leaf positioning accuracy: +/- 0.5 mm
  • Leaf end flatness: 0.1 mm
Quality Inspection
  • Radiation leakage test
  • Leaf positional accuracy verification via film dosimetry
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
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Supplier transparency
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Manufacturers of Multi-Leaf Collimator (MLC)

Manufacturer profiles associated with Multi-Leaf Collimator (MLC).

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Frequently Asked Questions

What is the primary function of a Multi-Leaf Collimator?

The primary function is to shape the radiation beam in radiotherapy to conform to the tumor's shape, thereby sparing surrounding healthy tissues.

What materials are commonly used in MLC construction?

Common materials include tungsten for the leaves, steel alloys for structural components, and copper for electrical or thermal management.

How does leaf width affect treatment?

Smaller leaf width improves conformality, allowing finer shaping of the beam to the tumor boundary, but may increase complexity and cost.

What should be verified before selecting an MLC?

Verify model-specific parameters such as number of leaf pairs, leaf width, positioning accuracy, transmission, and environmental ratings with the legal manufacturer.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

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

Collimator System
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

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

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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