这里我们用一个函数来描述不同频率分量在像平面的强度——衬度传递函数(Contrast transfer function,CTF)或者强度传递函数(Intensity transfer function,ITF)。 图1 图2 图3 图1所示为TEM成像示意图。电子束到达样品表面后绝大部分直接透射(电子束 a),其余被散射(电子束 b, c, d),并且散射角度越大,代表空间...
CTF还是一个defocus的函数，而完全聚焦的CTF可以让我们解析道更清晰的图像，但他的问题是对比度太低。当...
入射电子束并非完全平行，存在空间相干性和能量色散，这影响了CTF的形状。如图5所示，真实CTF随空间频率上升而衰减，表明有分辨率极限。固定 [formula]，改变 [formula] 的曲线如图6所示，[formula] 的最佳值受 [formula] 影响。Defocus的特定值 [formula] 可实现最佳分辨率，称为Scherzer defocus，它代表...
CTFCarboxyl-Terminal Fragment(biochemistry) CTFCommander, Task Force CTFChimica e Tecnologia Farmaceutiche(Italian: Chemistry and Pharmaceutical Technology; various universities) CTFCommon Trace Facility(software) CTFContrast Transfer Function CTFCommon Trace Facility ...
CTFSimulatorOptical aberrationAberration correctionBackground The contrast transfer function (CTF) is an important principle in the field of transmission electron microscopy (TEM) imaging. It provides information on how the electron wave that interacted with a sample (in frequency domain) in an ...
网络对比度传递函数 网络释义 1. 对比度传递函数 医疗器械缩略语中英对照... ...CTF Contrast Transfer Function对比度传递函数CTG Cardiotocography 分娩心电图描记法 ... www.3618med.com|基于5个网页
Contrast Transfer Function (CTF) Analysis Tool We present an automated analysis tool designed to generate reproducible Contrast Transfer Functions (CTFs) for various types of Head-Mounted Displays (HMDs). This CTF analysis tool processes acquired images from the HMD display. To compute the CTF of ...
Contrast transfer function(CTF).(a)CTF plotted againstspatial frequency???. The microscope is operated at 200 kV, with a source size of 0.005 Å−1and an energy spread of 0.5 eV[1??]. Thespherical aberrationis 2.0 mm. The amplitude contrast is assumed to be 0.05. The thick lin...
Part 3- The Contrast Transfer Function - G. Jensen 熟肉 P1 - 11:51 第一个例子 散射波在某个特定的空间频率上散射,总的phase shift为180°,蓝色向量极大地缩短了总和,所以标注contrast是一个负值,并且标在了-1的位置。 Part 3- The Contrast Transfer Function - G. Jensen 熟肉 P1 - 12:...
This paper presents a detailed analysis of bar/space pattern methods used in the contrast transfer function (CTF) calculation of linear solid-state X-ray sensitive detectors (LD). The analysis presented centres on the effect of cell aperture on LD response as well as on the measurement of the...