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作为医学诊断设备,临床上对B超有两个最重要的技术要求:一是探测深度;二是图像分辨力。图像分辨力包括空间分辨力和对比度分辨力,其中空间分辨力又分为轴向、侧向和俯仰方向3种,而“俯仰分辨力”的更常用称谓是“切片厚度”。本文介绍的是关于切片厚度的物理概念、临床意义及其标准化检测技术。一、声束切片厚度概念超声成像的基本原理告诉我们:当其频率达数兆赫兹,换能元件孔径达10mm以上时,超声波将在人体组织中成束传播,因而被称为“声束”或“波束”。A超探头和机械扇形扫描式B超探头采用的是单元式换
As a medical diagnostic equipment, there are two most important technical requirements for B ultrasound in clinical practice: one is the depth of detection; the other is the image resolution. The image resolution includes spatial resolution and contrast resolution. Among them, the spatial resolution is divided into three kinds of axial, lateral and pitch directions. The more common name for “pitch resolution” is “slice thickness”. This article describes the physical concept of section thickness, clinical significance and its standardized detection techniques. First, the concept of ultrasonic beam thickness slice Ultrasound imaging tells us the basic principle: When the frequency of several megahertz, the transducer pore size of 10mm or more, the ultrasound will be transmitted in human tissue beam, it is called “Or ” beam ". A super-probe and mechanical fan-shaped scanning B-probe is a unit exchange