نتایج جستجو برای: mri نمای dw
تعداد نتایج: 113134 فیلتر نتایج به سال:
Single-shot line scan imaging (LSI) was adapted to diffusion-weighted (DW) MRI by replacing the initial 90 degrees radiofrequency pulse of the underlying high-speed stimulated echo sequence by a DW spin-echo preparation period. Implementation on a 2. 0 T whole-body MRI system yielded DW images of the human brain with b factors of 750 s mm(-2) and total imaging times of about 500 ms either for a...
Diffusion-weighted (DW) MRI is sensitive to the microscopic thermal motion of water molecules on scales comparable with cellular structures. In biological tissue, the motion of these water molecules is hindered by a range of obstacles such as cell membranes, making it possible to probe microscopic properties of the tissue noninvasively in-vivo. Due to the coherent arrangement of fibrous structu...
This chapter will give an overview of the magnetic resonance imaging (MRI) modalities used in locally advanced rectal cancer (LARC) staging with an emphasis on the role of MRI and its significance for planning an effective therapeutic strategy for the individual patient. Specifically, the aim of this chapter is to present a brief review about: 1. Methodologies of Magnetic Resonance Imaging in L...
Diffusion-weighted MRI (DW-MRI) has been increasingly used in imaging neuroscience over the last decade. An early form of this technique, diffusion tensor imaging (DTI) was rapidly implemented by major MRI scanner companies as a scanner selling point. Due to the ease of use of such implementations, and the plausibility of some of their results, DTI was leapt on by imaging neuroscientists who sa...
BACKGROUND Surgical thrombectomy in the context of acute renal vein thrombosis (RVT) post-transplantation has had limited success, with considerable variation in the surgical techniques used. Unfortunately, it is usually followed by allograft nephrectomy within a few days if rapid allograft recovery does not ensue. We report a case of acute RVT in which nephrectomy was not performed despite a p...
Purpose: Diffusion-weighted MRI (DW-MRI) of the body is a non-invasive imaging technique that enables characterization of tissue microenvironments through measurement of variations in the mobility of water molecules due to cellularity, cell membrane integrity, and compartment they are located. Quantitative DW-MRI has a well-established role in the detection, characterization and follow-up of a ...
OBJECTIVE The study evaluated the applicability of diffusion-weighted magnetic resonance imaging (DW-MRI) and apparent diffusion coefficient (ADC) values in the diagnosis and staging of gastric carcinoma (GC). METHODS From December, 2013 to December, 2014, 35 GC patients were selected from the Department of Oncology. Carcinomatous gastric tissues were collected as the case group, and normal g...
BACKGROUND The application of advanced 3T MRI imaging techniques to study recovery after subarachnoid hemorrhage (SAH) is complicated by the presence of image artifacts produced by implanted aneurysm clips. To characterize the effect of these artifacts on image quality, we sought to: 1) quantify extent of image artifact in SAH patients with implanted aneurysm clips across a range of MR sequence...
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