Introduction Over the past couple of years, high field imaging is slowly expanding from the head to extremities and the body. A target of particular interest is the prostate, because of the high incidence of prostate cancer and the expected increase in diagnostic capabilities. One of the problems in imaging the prostate is the limited penetration depth of the RF signal, resulting in high power ...

An algorithm is described that localizes a set of simultaneously energized coils using MEG detectors. The algorithm is based on a mathematical model describing the coils as stationary magnetic dipoles, of which the source time functions are known. It is assumed that the source time functions are orthogonal. It is shown how this a priori knowledge can be used to improve the efficiency of the alg...

Introduction It has been shown that 3D P CSI sequences can be used to enhance spatial coil coverage of the single-channel coil to aquire 3D P spectrscopic data [1]. Furthermore, multi-channel P phased-array coils can be used to acquire data from the entire abdominal slice using a 2D CSI sequence [2]. If the coil is large enough to wrap around the entire liver, 3D MR spectroscpic data can also b...

MR is undoubtedly the most revolutionary imaging technology of the century. The clinical jsefulness of MRI has been widely accepted in the CNS, spine and certain body areas and the future vision of MR includes wide-ranging morphological and functional applications in cardiology, oncology, orthopaedics, obstetrics and sports medicine. In order to accommodate this wide range of clinical applicati...

Knowledge about the magnetic eld distribution in radio frequency coils is important for both magnetic resonance imaging and magnetic resonance spectroscopy. The information about the eld's distribution is used to obtain correct excitation pulse ip angles, as well as to perform signal strength corrections. Another use is also accelerating imaging and spectroscopic examinations, where accurate de...

High-resolution breast imaging may improve differentiation between benign and malignant lesions and may be important for refining treatment strategy. This article presents a new, flexible design of a breast-imaging coil capable of providing breast images of a high level of spatial resolution. Referred to as a switchable coil array, the design uses small-diameter surface coils that provide high ...

breast cancer is a major public health problem for women in the iran and many other parts of the world. dynamic contrast-enhanced magnetic resonance imaging (dce-mri) plays a pivotal role in breast cancer care, including detection, diagnosis, and treatment monitoring. but segmentation of these images which is seriously affected by intensity inhomogeneities created by radio-frequency coils, is a...

Introduction: Gradient coils may be replaced on MRI systems as part of hardware upgrades or as a result of hardware failure. These events could introduce a step change in longitudinal quantitative neuro-imaging studies. Gradient winding errors cause even nominally identical gradient coils to differ in their field. Additionally the precise alignment of the gradient coil in the magnet and the act...

Introduction. The signal-to-noise ratio (SNR) is an accepted measure of the coil performance and at the same time SNR is an accepted standard for measurement of image quality in MRI, as the quality of the reconstructed image depends strongly on the SNR of the acquired MR signals. Analytical expressions based on the Maxwell equations, can be derived for the simplest cases of surface coils [1], b...