Deep Learning Enables Reduced Gadolinium Dose for Contrast-Enhanced Brain MRI (Journal of Magnetic Resonance Imaging 2018) 这是一篇医学图像增强的论文,介绍了研究人员正在使用人工智能来减少MRI检查后留在体内的造影剂的剂量。 提出背景 钆(gá,gadolinium)是一种用于对比材料的重金属,可增强MRI上的图像,作为一...
An MRI was performed in thin slices (0.6 mm) on a healthy individual, with volumetric 3D imaging using T1 weighting without injection of gadolinium in the three normally used views, with a matrix of 320/320 pixels, using an MRI machine of 1.5 Tesla. Figure 2 - Brain : Coronal section ...
Magnetic resonance imaging (MRI) as a clinical investigation became available in the early 1980s. Since then this method has proven to be a valuable additional diagnostic tool in the recognition and delineation of space-occupying lesions of the brain (1, 2, 3, 5). In the present study the...
如前所述,造影增强 MRI(Contrast-enhanced MRI, CE-MRI) 可用于患者的疗效评估和肿瘤病变的检测标准,但它无法区分疑似病灶是进展恶化中的肿瘤还是治疗所致的非肿瘤损伤病变(如上述的治疗后辐射效应)。尽管这两种不同类型的病变在影像学方面均表现为对比增强的肿块,但二者预后截然不同。所幸的是,不同于CE-MRI,...
• To consider the capabilities of brain imaging (particularly functional MRI) to detect whether an individual has chronic pain • To place the capability of brain imaging as a diagnostic test for chronic pain in an ethical and legal context ...
(CNNs) require a fixed input size. Rescaling the pixel values to a range of 0 to 1 assists in stabilizing the training process as it normalizes the gradient updates during backpropagation, leading to faster convergence. MRI images can vary in contrast and brightness due to different scanning...
arterial magnetic susceptibility is not expected to change much as a result of breath-holding. However, hypercapnia uniquely results in vasodilation29—therefore, while MRI signal is not expected to change in the arteries from paramagnetic contrast agent, we expect that arterial vasodilation will result...
Routine MRI in congenital HIV is initially normal and despite the identification of HIV within fetal brain tissue as early as 15 weeks’ gestation, there are no associated brain malformations. Delay in myelin maturation is common in the infected young infant. Atrophy, HIV white matter disease ...
Dynamic susceptibility contrast (DSC) MRI plays a pivotal role in the accurate diagnosis and prognosis of several neurovascular diseases, but is limited by its reliance on gadolinium, an intravascularly injected chelated metal. Here, we determined the fe
Perivascular spaces (PVS), also known as Virchow-Robin spaces, are fluid-filled spaces that follow the typical course of cerebral penetrating vessels. PVS have the same Magnetic Resonance Imaging (MRI) contrast characteristics as Cerebrospinal Fluid (CSF), that is they appear hypointense (dark) on...