Introduction The transmit efficiency and receive signal-to-noise ratio (SNR) of transceive RF coils depends on how well the resonance circuit is tuned to the Larmor frequency and matched to the 50 ohm coaxial cable. Patient size variability changes the load the coil couples with and adversely impacts both tuning and matching, and subsequently the power efficiency and SNR of the coil. The loadin...

OBJECTIVE To study the therapeutic effect of endovascular treatment for intradural hemorrhage from ruptured spontaneous vertebral artery dissections (SVAD) using Guglielmi detachable coils and mechanical coils. METHODS The retrospective study was carried out in the Department of Interventional Radiology, Rizhao People`s Hospital, Rizhao, China from January 2008 to December 2011. Twelve patien...

BACKGROUND AND PURPOSE The purpose of this study was to determine whether implanting exogenous fibroblasts on platinum coils could enhance intra-aneurysmal fibrosis. Hypotheses included: (1) fibroblast-coated (FBC) platinum coils can improve angiographic results after embolization; and (2) FBC platinum coils can accelerate histological healing of embolized aneurysms. METHODS Experimental aneu...

OBJECTIVE Device- or technique-related air embolism is a drawback of various neuro-endovascular procedures. Detachable aneurysm embolization coils can be sources of such air bubbles. We therefore assessed the formation of air bubbles during in vitro delivery of various detachable coils. MATERIALS AND METHODS A closed circuit simulating a typical endovascular coiling procedure was primed with ...

BACKGROUND AND PURPOSE Endovascular treatment of intracranial aneurysms using platinum coils is effective, but uncommonly aneurysms recur. New-generation coils, such as Cerecyte, aim to address this problem. This study examines the safety and efficacy of these coils in the treatment of a cohort of ruptured and unruptured aneurysms MATERIALS AND METHODS Sixty-seven patients with 68 aneurysms w...

This work designed an intercalation internal induction heating coil in a mold and drew plate-type steel for the (size: 300 mm × 200 40 mm). First, to explore influence rule of special-shaped coils on effects, temperature rise curve surface was simulated at different depths, currents, frequencies. Next, extent which these three factors affect maximum mean uniformity discussed using Taguchi metho...

A novel traction AC motor is proposed by grouping magnets and coils in the stator design with aluminium as substantial for housing of end ring. The back iron designed silicon steel. As a result, magnet can provide more repulsion when revolving rotor, lowering input side current. configuration was changed to increase its effectiveness terms efficiency, performance appearances were investigated c...

The localization of effects from magnetic coil stimulation is not immediately obvious. We measured the magnetic fields produced by several different coils and compared the results with theoretical calculations. Magnetic stimuli were delivered from a Cadwell MES-10 magnetic stimulator using 3 circular coils (one 9 cm in diameter; two with an angulated extension, 5 and 9 cm in diameter) and twin ...

BACKGROUND AND PURPOSE Endovascular treatment of cerebral aneurysms, a minimally invasive alternative to surgery, is too often followed by recanalization and recurrences. The purpose of this work was to assess if in situ beta radiation can inhibit recanalization after coil embolization. METHODS Radioactive platinum coils (32P-coils) were produced by ion implantation of 32P. A single-coil arte...