We conduct a global, weakly nonlinear analysis of the magnetorotational instability (MRI) in a Taylor-Couette flow. This is a multiscale perturbative treatment of the nonideal, axisymmetric MRI near threshold, subject to realistic radial boundary conditions and cylindrical geometry. We analyze both the standard MRI, initialized by a constant vertical background magnetic field, and the helical M...

The computation of an optic flow field to reconstruct a dense velocity field from a sequence of tagged MR images faces a major difficulty: a non-constant pixel intensity. In this paper, we resolved this problem by regarding the MRI sequence as density images, which adhere to a principle of conservation of intensity. Based on this principle, optic flow equations are developed based on Gaussian d...

Purpose Magnetic resonance imaging (MRI)-guided procedures are typically performed under high magnetic field strengths (1.5-3 Tesla) and expensive. Recently, technological progress has led to MRIs that low-cost but similarly performing despite lower (58-74mT). Our purpose was evaluate the cost-efficiency of implementing a low-field MRI for targeted prostate cancer biopsy. Materials methods We u...

Correspondence to Selmi Yilmaz (Yardimci), Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Kirikkale University, Kurtuluş Mahallesi 692. Sokak No: 31. Merkez, Kirikkale, Turkey Tel: +90-318-224-4927 Fax: +90-318-225-0685 E-mail: selmiyard@ gmail.com Received: Jan 23, 2014 Accepted: Jan 24, 2014 Cite this article as: Yilmaz S. The safety of high-field MRI? Int J Occup Envir...

MRI at high magnetic field strengths promises to deliver clearer images of the body’s structure and function. However, high-field MRI currently faces several substantial engineering challenges before it can be considered robust and safe enough for routine clinical use. Challenges include increased radiofrequency (RF) energy deposition that can create unsafe patient heating, large main field inh...

Magnetic resonance imaging and spectroscopy can provide detailed morphologic, functional and metabolic information that may provide unique biomarkers to assist drug discovery and development. To overcome the inherent low signal to noise of in vivo magnetic resonance applications, stronger magnetic field strengths can be applied that not only boost signal strengths, but can also be used to impro...