行业组件数据 · 2026

钨叶

Tungsten leaves are precision radiation-shaping components in multi-leaf collimators used in medical linear accelerators for cancer treatment.

技术定义与适配语境
典型 钨叶 会按材料、尺寸公差、适配关系和失效风险在 机械和设备制造 中评估。

Tungsten leaves are individual, independently movable, high-density metal components arranged in banks within a multi-leaf collimator (MLC) system. They function as dynamic radiation attenuators that shape the therapeutic X-ray beam from a linear accelerator to match the tumor's contour in three dimensions, minimizing exposure to surrounding healthy tissues during radiotherapy.

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组件规格

定义
Tungsten leaves are individual, independently movable, high-density metal components arranged in banks within a multi-leaf collimator (MLC) system. They function as dynamic radiation attenuators that shape the therapeutic X-ray beam from a linear accelerator to match the tumor's contour in three dimensions, minimizing exposure to surrounding healthy tissues during radiotherapy.
工作原理
Each tungsten leaf is driven by a precise motor (typically a servo or stepper motor) along a curved path to project a straight edge at the isocenter. The leaves move into and out of the radiation field based on digital treatment plans, creating custom apertures. Their high atomic number (74) and density (≈19.3 g/cm³) provide effective attenuation of megavoltage photons through photoelectric absorption and Compton scattering.
材料
Primary: Tungsten or Tungsten alloy (e.g.W-Ni-FeW-Ni-Cu). May include minor alloying elements for machinability. Surface may have protective coatings. Backing structure often uses aluminum or composite materials for reduced weight.
Density
≥ 18 g/cm³
Leaf Speed
Up to 3 cm/s
Travel Range
Up to 200 mm from central axis
Maximum Field Size
Typically 40 cm x 40 cm
Positioning Accuracy
≤ 1 mm
Leakage Between Leaves
< 2%
Leaf Width at Isocenter
2.5 mm to 10 mm
Transmission Through Leaf
< 0.5%
标准
ISO 13485IEC 60601-2-1IEC 60601-2-29

行业分类与别名

钨叶 的常用贸易名称、技术标识和检索关键词。

tungsten leafmulti-leaf collimatorMLCradiation therapylinear acceleratorbeam shapingradiotherapycancer treatmentmedical device component钨叶Tungsten Leaves机械和设备制造 钨叶

上级产品

该组件会出现在以下整机或工业产品中。

多叶准直器
一种用于放射治疗中，将放射束塑形以匹配肿瘤轮廓的设备。
查看产品详情 ->
多叶准直器
一种用于放射治疗中，将辐射束塑形以匹配肿瘤轮廓的设备。
查看产品详情 ->

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Wear in drive mechanism or bearings->Reduced positioning accuracy or leaf sticking->Regular calibration and preventive maintenance; use of wear-resistant materials and lubrication where applicable.
Control system software error or communication fault->Incorrect leaf position, creating wrong radiation field shape->Redundant position verification (e.g., potentiometers, encoders); independent safety interlocks; rigorous software testing and validation.
Thermal effects from radiation absorption->Thermal expansion alters leaf position relative to isocenter->Thermal modeling in control algorithms; use of materials with low thermal expansion; active or passive cooling systems.

工业生态与工程逻辑

兼容对象
Medical Linear Accelerators (e.g., Varian TrueBeam, Elekta Versa HD, Accuray CyberKnife)Radiotherapy Treatment Planning Systems
可替换件
Varian Millenium MLCElekta Agility MLCSiemens ARTISTE MLC
0
Mechanical wear or backlash affecting positional accuracy
1
Radiation leakage through leaf gaps
2
Motor or drive failure immobilizing a leaf
3
Thermal expansion causing positional drift
4
Software control errors leading to incorrect field shape

合规与检测

tolerance
Leaf position tolerance typically ±1 mm at isocenter, with tighter tolerances (e.g., ±0.5 mm) for high-precision systems. Must meet manufacturer specifications and regulatory requirements for medical devices.
test method
Regular quality assurance tests including: Picket Fence test for leaf positioning accuracy and reproducibility, Garden Fence test for inter-leaf leakage, transmission measurements using ion chambers, and Winston-Lutz test for isocenter coincidence. Performed per TG-142 (AAPM) and manufacturer guidelines.

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技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例，不代表真实客户评分、具体国家买家反馈或实时询盘。

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研磨层
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磨料介质/工作面
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检修盖
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常见问题

Why is tungsten used for MLC leaves?

Tungsten has a very high density (≈19.3 g/cm³) and high atomic number (74), making it extremely effective at attenuating high-energy X-rays used in radiotherapy, allowing for thinner leaves and sharper beam edges.

How are tungsten leaves controlled?

Each leaf is controlled by an individual motor (servo or stepper) and drive mechanism, receiving positioning instructions from the treatment planning system via the MLC controller to dynamically shape the beam during treatment delivery.

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URN:CNFX:ME:UNIT:TUNGSTEN_LEAVES