INTRODUCTION: In our previous work on passive current source RF power amplifiers, it was noted that additional inter-element isolation in a parallel transmit coil array was possible when the lengths of the coaxial cables that connected the amplifiers to the coils were reduced [1,2]. In addition, shorter cable lengths also lead to reduced power loss and cost. This can be achieved by placing the ...

Radio frequency (RF) heating was applied to stirred yoghurt after culturing in order to enhance the shelf-life and thereby meet industrial demands in countries where the distribution cold chain cannot be implicitly guaranteed. In parallel, a convectional (CV) heating process was also tested. In order to meet consumers' expectations with regard to texture and sensory properties, the yoghurts wer...

INTRODUCTION: Radiotherapy is a primary cancer treatment modality. However, targeting a radiation beam on tumours in moving organs such as liver, stomach or lungs, without damaging healthy tissue can be challenging. For this reason, Magnetic Resonance Imaging (MRI) and Linear Accelerator (LINAC) are being combined as a MRI-LINAC, a new image-guided radiotherapy treatment capable to both image a...

We study the expansion of stable structures by adding predicates for arbitrary subsets. Generalizing work of Poizat-Bouscaren on the one hand and Baldwin-BenediktCasanovas-Ziegler on the other we provide a sufficient condition (Theorem 4.7) for such an expansion to be stable. This generalization weakens the original definitions in two ways: dealing with arbitrary subsets rather than just submod...

We present the construction and performance of a 20-μL active volume probe that utilizes zero-susceptibility wire for the detection transceiver coil and a 3.5 mm outer diameter thin-wall bubble flow cell to contain the sample. The probe shows good rf homogeneity, resolution, line shape and sensitivity. The sensitivity and resolution of the 20-μL probe was compared to those for several other coi...

Reverse correlation methods such as spike-triggered averaging consistently identify the spatial center in the linear receptive fields (RFs) of retinal ganglion cells (GCs). However, the spatial antagonistic surround observed in classical experiments has proven more elusive. Tests for the antagonistic surround have heretofore relied on models that make questionable simplifying assumptions such a...

Introduction: A new class of NMR/MRI rf volume coils is being developed that permits improved tuning range, tuning stability, B1 homogeneity, sensitivity, and ease of use compared to birdcages over a wide range of practical conditions, esp ecially for double-resonance microscopy and wraparound flexible applications. They are denoted litz coils (after the German word for "braided'), as the desir...

Introduction In an environment of ultrahigh field (UHF) MRI, B1 + inhomogeneity causes contrast difference and spatially varying image signal in region-ofinterest (ROI). Recently, several designs of radiofrequency (RF) coils have been suggested to compensate this B1 + inhomogeneity. Using parallel transmission system [1-2] is also meaning for compensating B1 + inhomogeneity. However, most of av...

Although in the design of transmit RF coils, B(1) homogeneity is crucial for good image quality, discussion of electric field (E-field) distribution in the literature has been mostly limited to specific absorption rate (SAR) and patient loading (dielectric) effects. In this work, we report on a different aspect of E-field: the receive-only surface coil heating resulting from the voltage drop ac...

There are advantages to conducting cardiovascular magnetic resonance (CMR) studies at a field strength of 3.0 Telsa, including the increase in bulk magnetization, the increase in frequency separation of off-resonance spins, and the increase in T1 of many tissues. However, there are significant challenges to routinely performing CMR at 3.0 T, including the reduction in main magnetic field homoge...