提出了一种二次反锐化掩模算子(QUM)，用于从图像中提取等比重的边缘和细节信息。
A quadratic unsharp masking (QUM) operator is presented, which extracts edge and detail information from an image with equal weights.
目的：比较等比重与重比重局麻药在腰麻中临床应用的优缺点，为低位手术麻醉提供参考。
Objective To reveal the advantages and disadvantages of the application of isobaric and hyperbaric local anesthetic in spinal anesthesia so as to provide reference for clinical practice.
目的 探讨不同注药速度对等比重罗哌卡因脊麻在感觉阻滞和运动阻滞效果以及不良反应发生率的影响。
Objective To investigate the influence of injection rate of isobaric ropivacaine on sensory block, motor block and adverse effects in patients undergoing gynecologic surgery.
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