Processing the aluminum weld image from the scanning of the X ray negative can derive the binary image of the weld defects.
利用X射线底片扫描成像法得到铝合金焊缝图像，再通过图像处理方法即可得到焊接缺陷二值图象。
Conclusion There are varied clinical manifestations in pneumothorax patients with thoracic X-ray negative. CT was the best diagnosis way of the disease.
结论胸片阴性的气胸患者，临床表现多种多样，CT是诊断该病的最佳方法。
Dr Hess envisages a ray of light travelling down an optical fibre made from two materials: a core with a negative refractive index and an outer sheath with a positive one.
赫斯博士构想出一个画面，即一道光正穿越于一个由两种材料制作的光导纤维，一种是具有正折射指数的纤维核，另一种则是具有正折射指数的外围。
In the female osteoarthritis patients, the serum testosterone level had negative correlation with the ISOA, the severe degree score of the X-ray manifestation and the symptomatic score of TCM.
女性肾阳虚型骨性关节炎患者血清睾酮水平的高低与骨关节炎严重性指数（ISOA）、X线表现轻重程度及中医症状评分负相关。
Infrared ray and negative ion of bamboo charcoal were tested.
并测试了竹炭的红外线性能与负离子性能。
Methods 25 patients who had foreign body inside the digestive tract but the X-ray exploration was negative, were exarnined with ultrasonic inspection with high and Iow frequency detecting head.
方法对25例有明确异物吞入史，但X线探查为阴性的患者，运用超声高、低频探头对可疑部位进行探查定位。
Methods: MRI and other imaging data of 31 patients with negative performance on plain X-ray films were retrospectively analysed.
方法：回顾性分析31例X线片阴性患者的MRI及其他影像学资料。
The Royal College of Radiology promotes MRI, CT, and scintigraphy equally when X-ray is negative.
皇家放射学会认为当x -线检查是阴性时，MRI,CT，还有闪烁扫描法的作用是等同的。
Objective: To analyze the difference characteristics of X-ray findings in active pulmonary tuberculosis with smear positive and smear negative.
目的：分析活动性肺结核有关X线征象的特征。
Objective: To analyze the difference characteristics of X-ray findings in active pulmonary tuberculosis with smear positive and smear negative.
目的：分析活动性肺结核有关X线征象的特征。
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