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Silent MR-3D ASL
Silent MR-三维动脉自旋标记成像
3D ASL utilizes water in arterial blood as an endogenous contrast media to help visualize tissue perfusion and provide quantitative assessment of cerebral blood flow (CBF) in ml/100 g/min. 3D ASL deploys stacked spiral FSE readout with modulated flip angle to acquire 3D volumetric data with increased SNR and less image distortion compared to conventional 2D EPI-based ASL techniques. A pulsed-continuous labeling is applied to label arterial blood close to the imaging volume thus improving conspicuity of flowing blood. Selective, interwoven pulses are then used to saturate and invert the imaging volume, in order to achieve better background suppression, and reduce sensitivity to motion. The 3D volume can be reformatted to axial, sagittal, coronal or oblique planes. The quantitative color CBF maps can be generated and stored in DICOM format. 3D ASL helps generate robust, reproducible images and perfusion maps with high SNR, reduced motion artifacts and less distortion in high magnetic susceptibility regions.
3D ASL(内源性对比脑灌注成像)是衡量血液流动状态的成像技术，无须打药，一次扫描实现全脑灌注成像，可测量特定区域的脑血流量，与传统2D动脉质子自旋标记成像相比其优点十分明显：
三维成像，高信噪比，覆盖全脑
标记位置靠近成像区域，将T1衰减效应减至最低
采用自旋回波，减少磁敏感伪影和金属伪影
螺旋式数据采集，高采集效率，缩短扫描时间
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Silent MR-eDWI
Silent MR-多对比弥散成像
The enhanced Diffusion Weighted Imaging technique has been designed to provide high signal-to-noise-ratio diffusion images of the liver and brain with short-acquisition time Its multi-B feature is designed to provide measurement of apparent diffusion coefficient (ADC) map with reduced effect of perfusion. In addition, “3 in 1” technique applies diffusion weighting to all three gradients simultaneously, helping improve sensitivity. Built in tetrahedral feature applies four different diffusion weighing combinations of x, y, and z gradients simultaneously to acquire isotropic diffusion weighted images with high signal to noise ratio and shorter TE. Its smart NEX feature significantly reduces the acquisition time. Inversion recovery has been deployed to provide robust fat suppression. Enhanced DWI package includes the acquisition sequence and post-processing tools.
eDWI(多对比弥散成像技术) 是衡量细胞内外水分子运动状况的最新弥散成像技术，它克服了以前DWI图像中PWI效应的影像，为临床提供更准确的组织ADC信息，同时它也是新一代高信噪比高分辨率肿瘤筛查方法，在分子水平对肿瘤的诊断与预后进行评估，其优点如下：
多达40个B值可选，ADC值更准确；
各向同性四面体采集；
扫描时间更短，信噪比更高，背景更干净
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Silent MR-IDEAL QUANT
Silent MR-肝脏无创定量成像技术
Ideal IQ can quantitatively measure fat content and iron content in the liver by multi-contrast and multi-echo imaging during one scan. For many diffuse liver lesions, especially cirrhosis of the liver, liver hemoglobin disease has a very important clinical significance.
One scan obtains different echo in different echo time using Gradient echo sequence (GRE). The echo signal curve is the T2* relaxation curve that changes by different iron content. Tissue’s R2* and T2* can be quantitatively calculated according to the signal curve and then get accurate intrahepatic fat content with the corresponding R2 * correction.
IDEAL IQ is the multi-echo acquisition based on 3D, the SNR is significantly higher than the 2D acquisition, which is very important for quantitative research, since the iron content and intrahepatic fat content is quantified by the signal curve analysis.
Meanwhile, IDEAL IQ also achieves the evaluation of liver volume, which is also crucial for the analysis of diffuse lesions.
IDEAL IQ通过多对比度、多回波成像在一次成像中能对肝内脂肪含量及铁含量进行双定量研究。这对于许多肝脏弥漫性病变特别是肝硬化、肝脏血色素病有非常重要的临床意义。
利用梯度回波序列一次采集同时获取多个不同TE时间的回波，这些回波所描记的信号变化曲线即为T2*弛豫曲线，该曲线会因为含铁不同而不同。根据该信号曲线可以定量计算出组织的R2*和T2*，用相应的R2*进行校正就能得到准确的肝内脂肪含量。
IDEAL IQ是在3D基础上实现的多回波采集，其信噪比明显高于2D采集，这对于定量研究非常重要，因为铁含量以及肝内脂肪含量是通过通过信号变化曲线来定量分析。
同时，IDEAL IQ实现了肝脏容积评价，这对于分析弥漫性病变也至关重要。 |
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