查询词典 subtraction

Many devices have been applied to the diagnosis of it, such as digital subtraction angiography, color doppler ultrasound, magnetic resonance angiograph, computed tomography angiography and personal vascular laboratory.

其诊断方法很多，包括动脉造影、彩色超声多普勒、核磁共振血管造影、计算机断层血管造影和多功能周围血管检查等。

Because the subtraction processes is adopted,the system can get over the noise and outside disturb signals effectively;and pass-zero processing method can get over the effect of optics facular intensity changes.

由于测量装置采用了象限相减的差动信号处理方式，可以有效克服噪声的影响及外部干扰信号的影响；信号处理过程中采用的过零检测处理方法，有助于克服光斑强度的变化对测量结果的影响。

A pivotal problem to recognize of the precise position of laser facula has been solved in the process of design work: Firstly the method of background-subtraction is used to eliminate or weaken the affect of background light. Secondly the image threshold segmentation operation and morphologic operation are used to locate the sketchy position of laser facula ; Then the new method of Extracting Edge are designed based on character of laser facula , by using this method in the search area the edges of laser facula can be extracted effectively; At last the optimum picture of laser facular is selected by using the triggering function of hardware and function of software. The exact result can be obtained only by image processing to optimum picture.

在设计过程中解决了精确确定激光斑中心位置这一关键问题：首先利用减背景法，消除或减弱背景光的变化对确定激光光斑中心的影响；再对减完背景后的图片进行阈值分割和二值化处理以确定激光光斑的粗略位置；根据本文激光光斑的特征，设计了一个有效的边界提取算法，对指定区域进行提取激光光斑边界操作，精确的确定激光斑中心位置；最后利用硬件的触发功能和软件编程实现了激光光斑最佳图片的判读，只有对最佳图片进行图像处理得到结果才是准确的。

Results In all the cases,the diagnostic rate of single rib fracture,multiple rib fracture,rib fracture with hydropneumothorax,rib fracture with pulmonary contusion was 86.7%,91.3%,90.5% and 94.1%,97.1% in multiple rib fracture of energy subtraction image.

结果 在本组病例中，标准胸片发现肋骨单发骨折、肋骨多发骨折、骨折合并液气胸、骨折合并肺挫伤的检出率分别为86.7%、91.3%、90.5%和94.1%；而能量减影仅在肋骨多发骨折中检出率为97.1%，其余检出率均为100%。

An important step is how to extract and segment the information of defects from inspective image.This paper introduces a digital subtraction into image segmentation in order to make the algorithm simpler,more automatic,high-speed,and accurate.

引言随着生产技术的发展，现代工业对于X射线的自动检测与识别的需求越来越迫切，而要实现它的关键是如何将缺陷及反映缺陷特征的信息从图像中提取出来，并给予正确的解释。

For lensless magnification mode, the subtraction method was presented to eliminate the system total aberration to get the 3D phase information of the phase gating by using Fresnel approximation approach and the convolution approach, respectively.

在无透镜放大数字显微全息系统中，分别利用菲涅耳近似法和卷积方法再现原始物波前，并提出相减法消除系统主要球面误差，获得相位光栅的深度信息。

The background edge eliminating method based on background subtraction was improved first and then combined with GVF Snake to extract the locomotory target contour.

该方法首先改进了基于背景减的背景边缘抑制方法，然后将其与GVF Snake方法相结合，提取运动目标轮廓。

The result is that different LUT algorithms can result in different effects of subtraction image.

结果表明：使用不同的输出查找表算法，会得到不同效果的数字减影血管造影图像。

This property is shared by most binary operations, but not subtraction or division or octonion multiplication .

这个属性是共享的最二进制行动，而不是减法或科或octonion乘法。

Objective To evaluate the clinical significances of digital subtraction angiography in preoperation patients of hepatocellular carcinoma.

目的 评价数字减影血管造影对我国原发性肝癌术前的意义。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。