因此,每次成像之前都要进行一次调谐(tuning)。调谐分为自动调谐和手动调谐两种,其中手动调谐只在个别线圈中使用。线圈的调谐一般通过改变谐振回路中可变电容的电容值或变容二极管的管电压(从而改变其电容值)两种方式来实现。MRI设备的调谐过程与收音机的选台非常相似,并常常伴有由机械调谐传动机构发出的“咔咔”声音。
The authors briefly discuss four tuning and matching networks and their application range in magnetic resonance (MR) imaging and MR spectroscopy. Analytic expressions for the network elements needed to tune and match an MR imaging or spectroscopy probe for a given coil impedance are given, and the...
These improvements persist over a wide range of practical data signal-to-noise ratios, without any parameter tuning. 展开 关键词: Compressed sensing (CS) dictionary learning image reconstruction magnetic resonance imaging (MRI) reduced encoding sparse representation DOI: 10.1109/TMI.2010.2090538 ...
However, most existing denoising algorithms require laborious tuning of parameters that are often sensitive to specific image features and textures. Automation of these parameters through artificial intelligence techniques will be highly beneficial. In the present study, an artificial neural network ...
Chapter6MR参数 I.信噪比SignaltoNoiseRatio~SNR SNR是MR非常重要的一个参数噪声来源于病人、背景和系统电子噪声等……noisesignal SNR与设备有关，如：–磁场B0~Magneticfield–线圈~coil–调谐~tuning–校准~Calibration –……线圈尺寸越大，SNR越低 SNR与扫描参数有关：SNR?(?voxel)((Ny)(NEX)/BW)1/2Voxel=...
成像过程。MR 参数I.信噪比信噪比signal to noise ratioSNR SNR是是MR非常重要的一个参数。非常重要的一个参数。 噪声来源于病人、背景和系统电子噪声等噪声来源于病人、背景和系统电子噪声等noisenoisesignalsignalSNR 与设备有关,如与设备有关,如磁场磁场B0Magnetic field线圈线圈coil调谐调谐tuning校准校准C 2、a...
Security Insights Additional navigation options master 1Branch0Tags Code README License We have built a set of pre-trained models calledGeneric Autodidactic Models, nicknamedModels Genesis, because they are createdex nihilo(with no manual labeling), self-taught (learned by self-supervision), and gen...
Background Low signal‐to‐noise ratio (SNR) has been a major limiting factor for the application of higher‐resolution diffusion‐weighted imaging (DWI). Most of the conventional denoising models suffer from the drawbacks of shallow feature extraction and hand‐crafted parameter tuning. Although mult...
The later MR-F10, MR-F20, and MR-F30 players with colour screens, drag-and-drop file transferring, and FM tuning and recording were only released in... BM Jessalyn - Sess Press 被引量: 0发表: 2012年 Estimates for regularity of the tangential MSC (2010) 32F1032F2032N1532T25We study ...
Pre-trained generative models can play an important role for sharing synthetic images from small datasets, as it should be less likely for a pre-trained model to memorize a small number of new images during fine tuning (compared to training the model from scratch). To determine an acceptable ...