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相关概念视频

Computed Tomography01:10

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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Updated: Jul 23, 2025

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使用Acuros XB算法和使用高空间分辨率二维二极管阵列HypeArcTM验证Qfix EncompassTM沙发建模.

Takumi Yamada1, Hisashi Nakano2, Satoshi Tanabe3

  • 1Section of Radiology, Department of Clinical Support, Niigata University Medical and Dental Hospital, Niigata, 951-8520, Japan.

Medical dosimetry : official journal of the American Association of Medical Dosimetrists
|July 16, 2023
PubMed
概括

使用特定的Hounsfield单位 (HU) 值实现了Qfix EncompassTM固定系统的准确建模. 这验证了AcurosXB (AXB) 剂量计算算法,显示了对立体射线手术计划的98%以上准确性.

关键词:
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科学领域:

  • 医学物理 医学物理
  • 辐射瘤学 辐射瘤学
  • 放射治疗治疗计划 放射治疗治疗计划

背景情况:

  • 精确的剂量计算对于有效的放射治疗至关重要.
  • Qfix EncompassTM 固定系统需要精确的建模来验证剂量.
  • 立体辐射手术 (SRS) 需要高精度的剂量传递.

研究的目的:

  • 在治疗计划系统中模拟Qfix EncompassTM固定系统.
  • 为了验证SRS HyperArcTM计划的AcurosXB (AXB) 剂量计算算法计算的剂量分布.
  • 为了确定最佳的霍恩斯菲尔德单位 (HU) 值,用于准确的EncompassTM建模.

主要方法:

  • 使用CT扫描和QA幻影模型建模了Qfix EncompassTM系统.
  • 使用了AcurosXB (AXB) 剂量计算算法 (ver. 15.5) 具有1.0毫米的网格.
  • 在12个患者计划中使用SRS MapCHECK® (SRSMC) 和马分析验证了剂量分配.

主要成果:

  • 拟议的EncompassTM建模实现了使用1%/1毫米马标准的6 MV和6 MV FFF光束的平均通过率>98%.
  • 为EncompassTM及其不同光束类型 (6 MV和6 MV FFF) 的基础确定了优化的HU值.
  • 经过验证的建模证明了准确的剂量分配计算.

结论:

  • 开发的EncompassTM建模与特定的HU值准确地表示了固定系统.
  • 在这种建模中使用的AcurosXB (AXB) 算法为HyperArcTM SRS计划提供了可靠的剂量计算.
  • 这种方法提高了放射治疗治疗计划和剂量验证的准确性.