基于最小化方差的多点射线探测器的一致性校准方法
By establishing a dose-to-reading mapping model for the ionization chamber using the method of minimizing variance, and solving the calibration factor using the Lagrange multiplier method, the problems of measurement error and time consumption in the calibration process of multi-point X-ray detectors were solved, achieving efficient and accurate consistency calibration.
CN117331113BActive Publication Date: 2026-07-17GUANGZHOU RAYDOSE MEDICAL TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGZHOU RAYDOSE MEDICAL TECH CO LTD
- Filing Date
- 2023-09-11
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing methods for consistency calibration of multi-point X-ray detectors suffer from problems such as large measurement errors, time-consuming and labor-intensive processes, and difficulty in handling complex equipment.
Method used
By employing a method based on minimizing variance, a mapping model between ionization chamber dose and reading is established. The calibration factor is then solved using normally distributed random variables and the Lagrange multiplier method, simplifying the calibration process and improving accuracy.
Benefits of technology
It enables efficient and accurate calibration of multi-point measurement equipment, is suitable for equipment with complex structures, reduces measurement steps, and improves calibration efficiency.
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Abstract
本发明提供一种基于最小化方差的多点射线探测器的一致性校准方法，包括建立电离室的剂量到读数的映射关系模型，通过多次测量剂量的均值来估计一点的剂量，而且通过任意一点P中，获取第n步测量时第i号电离室的读数为以及点P的剂量估计，并对估量引入方差，然后拉格朗日函数对目标函数求解，获取校准因子C，本发明适用于任何的多点测量设备；只假设加速器出束是稳定的，而不对剂量分布的平坦性有任何要求，能够应对更灵敏的硬件设备的一致性校准问题；能够应对探头数量众多的设备，极大地简化了一致性校准测量过程；而且不需要针对特定的测量设备专门推导递推公式，而且能够得到尽可能少的测量步骤，能够面对各种复杂的测量设备。
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