一种基于生物雷达的隐匿性伤情检测方法研究

Bio-radar based method for detecting occult injuries

目的:针对院前急救中低成本、便携式伤情检测设备的研制需求,提出一种基于生物雷达的隐匿性伤情检测方法。方法:该方法基于某些隐匿性伤情出现会破坏人体浅表组织结构左右对称性的原理,使用单发单收冲激脉冲体制超宽带生物雷达测量人体左右两侧对称位置的回波差异,采用直达波定位保证左右测量位置的对称性,设计基于线性判别分析(linear discriminant analysis,LDA)的检测算法来量化回波差异。为验证方法的有效性,开展基于液态体模的模拟气胸探测实验。结果:在直接接触体模条件下,无气胸、左侧气胸和双侧气胸3种场景的差异数值分别为0.628 8、5.724 5和5.835 6;在穿透衣物条件下,无气胸、左侧气胸和双侧气胸3种场景的差异数值分别为2.234 2、4.255 0和6.768 2。结论:该方法初步实现了有/无伤情的检测,与现有技术相比具有体积小、测量方便、可穿透衣物的潜在优势,可为下一步设计一种低成本、便携式的非接触伤情检测装备提供可行的思路。

Objective To propose a bio-radar based occult injuries detection method for the development of low-cost,portable injury detection equipment for pre-hospital emergency care.Methods Some occult injuries disrupted the left-right symmetry of the superficial tissue structure of the body.Accordingly,the method proposed used an impulse ultra-wide band bio-radar with single-transmission-single-receiving antennas to measure the difference in echoes between the symmetrical parts in Lat direction of the human body and direct wave to ensure the symmetry during measurement,which designed a detection algorithm based on linear discrimination analysis to quantify the difference of the echoes.The experiments were carried out to simulate pneumothorax detection based on liquid body models so as to verify the validity of the method proposed.Results The difference values were 0.6288,5.7245 and 5.8356 respectively for the three scenarios of no pneumothorax,left pneumothorax and bilateral pneumothorax in case of direct contact with the phantom,and 2.2342,4.2550 and 6.7682 respectively for the three scenarios in case of penetrating clothing.Conclusion The method detects the existence of the injuries preliminarily,and gains advantages over the existing techniques in size,convenience and the ability to penetrate clothing,which provides a viable idea for designing a low-cost,portable,non-contact injury detection equipment in the future.