Translational and Molecular Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA To evaluate the effect of surface coils for carotid MR imaging on PET quantification in a clinical simultaneous whole-body PET/MR scanner. A cylindrical phantom was filled with a homogeneous 2L water-FDG mixture at a starting dose of 301.2MBq. Clinical PET/MR and PET/CT systems were used to...

A method for obtaining localized high-resolution magnetic resonance (MR) images of the eye and orbit is demonstrated. The method uses modified surface receiver coils placed immediately adjacent to the anatomy to detect the MR signal. Surface coils provide enhanced sensitivity for imaging voxels close to the surface of the body while limiting the received patient-generated noise. The resulting i...

Introduction: MR guided Radiation Therapy (MRgRT) is a new hybrid technique that combines MR’s soft tissue contrast for better accuracy in tumor delineation during the planning stage and reduction of healthy tissue damage during the treatment stage with Radiation therapy equipment such as LINACs. One more important aspect of such a hybrid system is the real time monitoring of the motion for the...

A review of the theory, technology, and practice of RF coils for small-animal MRI is presented that includes a brief overview of MR S/N analysis and discussions of the various coils commonly used in small-animal MR – surface coils, linear volume coils, birdcages, and their derivatives. The scope is limited to mid-range coils – coils where the product (fd) of the frequency f and the coil diamete...

Introduction: One of the major causes of image non-uniformity in MRI is due to the existence of  non-homogeneity in RF receive and transmit. This can be the most effective source of error in  quantitative  studies  in  MRI  imaging.  Part  of  this  non-homogeneity  demonstrates  the  characteristics of RF coil and part of it is due to the interaction of RF field with the material being  imaged...

The use of surface coils in MR imaging allows for the possibility of obtaining images with increased signal-to-noise ratio and increased spatial resolution [1]. To obtain the maximum signal, the coil should be placed close to the region to be imaged. For rigid coils , a close fit may be difficult to obtain routinely and can lead to patient discomfort. We describe a technique for constructing fl...

Effective denoising is vital for proper analysis and accurate quantitative measurements from magnetic resonance (MR) images. Even though many methods were proposed to denoise MR images, only few deal with the estimation of true signal from MR images acquired with phased-array coils. If the magnitude data from phased array coils are reconstructed as the root sum of squares, in the absence of noi...

Introduction: Small animal MR imaging and spectroscopy, where spatial resolution is a limiting factor, requires the use of distinct transmit and receive coils [1]. This approach makes easier the optimization of the RF field homogeneity for transmit-only coils and signal-to-noise ratio (SNR) for receive-only coils. It also requires that RF coils should be electrically decoupled, commonly using P...

Introduction MR imaging of mice in medical research has allowed for well controlled disease models for pharmokinetic and dynamic tests of new contrast and therapeutic agents. However, the volume of interest in mice is typically several orders of magnitude smaller than in humans, and concomitantly the number of spins that contribute to the signal in an MR exam will be substantially smaller, ther...