and D.K. Sodickson, Ideal current patterns yielding optimal signal-to-noise ratio and specific absorption rate in magnetic resonance imaging: computational methods and physical insights. Magn Reson Med 2012. 68(1): p. 286-304.Lattanzi R, Sodickson DK (2012) Ideal current patterns yielding ...
The signal-to-noise ratio (SNR) at the output of an ideal FM detector is determined as a function of the modulation index for the case of an SSB-FM signal plus narrow-band Gaussian noise at the input, where the input SNR is large. The modulation is assumed to be sinusoidal, and the...
However, the difference between the two masks has not been addressed rigorously in the signal-to-noise ratio (SNR) sense. In this paper, we analytically investigate the difference between the two ideal masks under the assumption of the approximate W-Disjoint Orthogonality (AWDO) which almost ...
【摘要】目的:对比研究IDEAL序列和频率选择预饱和脂肪抑制方法的信噪比(signal to noise ratio,SNR)、对比噪声比(contrast to noise ratio,CNR)和脂肪抑制的均匀性,以明确IDEAL序列在乳腺MR成像中的优缺点.方法:选取19名行乳腺MR检查的患者,选择病变相同的层面测量SNR和CNR;对2种脂肪抑制方法所得图像选择相同层面的20...
论著lThesis ·79· IDEAL序列与频率选择预饱和脂肪抑制在 乳腺MR中的对比研究 张晓晶,高珊珊,赵彦清,王锡臻 摘【要】 目的:对比研究IDEAL序列和频率选择预饱和脂肪抑制方法的信噪比 signaltonoiseratio,SNR 、对比噪声比 contrastt0noiserati0,CNR 和脂肪抑制的均匀性,以明确 IDEAL序列在乳腺MR成像 中的优缺点。方...
信噪比(signal-to-noise ratio,SNR)和SNR效率计算:分别在IDEA-T2WI水像和FS-T2WI图像的同一层面上,对正常舌体、腮腺、颈背部皮下脂肪、头夹肌和背景噪声区设置感兴趣区(region of interest,ROI),背景噪声位于结构像之外,需避开伪影,每个ROI面积约为10 mm2,获得信号强度值(SIA)和背景信号的标准差(sn),分别计算组...
Signal-To-Noise RatioA direct proof is presented of a form of Alvise Trevisan's result, that every monomial ideal ring is represented by the cohomology of topological space. Certain of these rings are shown to be realized by polyhedral products indexed by simplicial complexes....
方法 选取体内(腰推、颈椎、骨盆等)含有金属内固定行MRI 检查的患者20例，做常规序列扫描及加 FS 、IDEAL 序列扫描，对所得图像通过软件获得感兴趣区信号的强度值分别计算信噪比(Signal to Noise Ratio, SNR)和对 比噪声比(Contrast to Noise Ratio , CNR ),记录数据结果并做统计学分析；对脂肪抑制...
OBJECTIVE: The purpose of this study was to perform imaging of cartilage at high resolution with a high signal-to-noise ratio (SNR) with a combination of iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) with parallel imaging at 3 T and spoiled...
BACKGROUND: Short TI inversion-recovery (STIR) imaging is widely used, but its signal-to-noise-ratio (SNR) is relatively low. Iterative decomposition of wa... N Tomura,T Saginoya,M Kokubun,... - 《Acta Radiologica》 被引量: 8发表: 2015年 Multiecho IDEAL Gradient-Echo Water-Fat Separati...