نتایج جستجو برای: radiofrequency field
تعداد نتایج: 803430 فیلتر نتایج به سال:
Background: Severe pain is present in trigeminal neuralgia and may be devastating and debilitating. There are multiple modalities of nonsurgical techniques to help with pain and functionality. Patient: 47 year old male with 6 year history of facial pain due to trigeminal neuralgia. Treated at outside institution with medical management. Intervention: Left gasserian ganglion pulsed radiofrequenc...
The main goal of the project is to develop a VME standard board with two independent radiofrequency inputs. Fast 12 bits A/D converter will digitize each channel at max. rate 40 MHz. After digitalization signal will be down converted by DDC (Harris HSP-50016 Digital Down Converter) with fully programmed intermediate frequency as well as phase. Detected signal from the DDC will be send to TMS320...
Radiofrequency magnetic fields are critical to nuclear excitation and signal reception in magnetic resonance imaging. The interactions between these fields and human tissues in anatomical geometries results in a variety of effects regarding image integrity and safety of the human subject. In recent decades, numerical methods of calculation have been used increasingly to understand the effects o...
PURPOSE At high magnetic field strengths (B(0) ≥ 3 T), the shorter radiofrequency wavelength produces an inhomogeneous distribution of the transmit magnetic field. This can lead to variable contrast across the brain which is particularly pronounced in T(2) -weighted imaging that requires multiple radiofrequency pulses. To obtain T(2) -weighted images with uniform contrast throughout the whole b...
BACKGROUND Radiofrequency ablation is a minimal invasive therapy in the treatment of bone metastases. In this study we present a new ablation system enabling an ablation in multiple directions and with an adaptable size and shape. MATERIAL AND METHODS VX-2 tumor was used for the induction of experimental bone metastases in the femur of six New Zealand white rabbits. X-ray imaging as well as C...
We have observed multi-photon resonances in a system with a spin 3/2 irradiated simultaneously by a multiple pulse radiofrequency sequence and a low frequency field swept in the range 0-80 kHz. The used excitation scheme allowed us to measure the effective field of the radiofrequency sequence. A peculiarity of this scheme is that the intensity of the resonance lines decreases slowly with the mo...
BACKGROUND Ablation of para-Hisian accessory pathway (AP) poses high risks of atrioventricular block. We developed a pacing technique to differentiate the near-field (NF) from far-field His activations to avoid the complication. METHODS AND RESULTS Three-dimensional mapping of the right ventricle was performed in 15 mongrel dogs and 23 patients with para-Hisian AP. Using different pacing outp...
Radiosurgery is a new technique that utilizes an instrument, the radiofrequency bistoury, which is able to simultaneously cut and coagulate tissues with the emission of radiofrequencies. The first experiments about the utilization of radiofrequency currents on man were conducted between the end of the 19th century and the beginning of the 20th century. The first medical field of application was...
Background: Widespread and growing sources of electromagnetic radiation raised concerns attributed to the potential adverse health risk of radiofrequency fields. Given the functional importance of the hippocampus, this study aimed to investigate the effects of electromagnetic waves radiated by mobile jammer on hippocampal expression of p21 and p53 genes as regulators of cellular apoptosis...
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