BACKGROUND Identification of recurrent patterns in complex fractionated atrial electrograms (CFAE) has been used to differentiate paroxysmal from persistent atrial fibrillation (AF). Detection of the atrial CFAE patterns might therefore be assistive in guiding radiofrequency catheter ablation to drivers of the arrhythmia. In this study a technique for robust detection and classification of recu...

During an interventional magnetic resonance imaging (MRI) procedure, various kinds of surgical and interventional devices, such as needles, catheters, and guidewires, that contain metallic components are used inside the MRI scanner. Interference of these devices with radiofrequency pulses is known to be a possible health risk. The radiofrequency (RF) power delivered by an RF body coil may becom...

RFI mitigation in Radioastronomy can be achieved adopting cryogenic filters in appropriate typologies. A study has been conducted in L, C and X band with the evaluation of the filter architecture in copper, with theoretical estimation, computer simulations, prototypes realization, laboratory measurements. Such work has been preliminary to the realization of HTS samples with the purpose of a sim...

In magnetic resonance imaging performed at fields of 1 T and above, the presence of a metal insert can distort the image because of susceptibility differences within the sample and modification of the radiofrequency fields by screening currents. Furthermore, it is not feasible to perform nuclear magnetic resonance (NMR) spectroscopy or acquire a magnetic resonance image if the sample is enclose...

We propose to use the method introduced by Volchkov et al., based on state dependent disordered ultracold bosons, to address the critical state at the mobility edge of the Anderson localization transition, and to observe its intriguing multifractal structure. An optimally designed external radio frequency pulse can be applied to generate transitions to eigenstates in a narrow energy window clos...

Ablation of ventricular tachycardia (VT) by conventional radiofrequency ablation can be impossible if the ventricular wall at the targeted ablation site is very thick, as for example the ventricular septum. We present a case of a patient with incessant, non-sustained slow VT originating from the septal part of the lower outflow tracts. Radiofrequency catheter ablation from both ventricles as we...

OBJECTIVES We aimed to prospectively evaluate the response and safety of pulsed and continuous radiofrequecy lesioning of the dorsal root ganglion/segmental nerves in patients with chronic lumbosacral radicular pain. METHODS Seventy-six patients with chronic lumbosacral radicular pain refractory to conventional therapy met the inclusion criteria and were randomly assigned to one of 2 types of...

OBJECTIVES Surgical radiofrequency ablation is increasingly used during open heart surgery for the treatment of chronic atrial fibrillation. The purpose of this study was to determine the effects of application of radiofrequency on coronary endothelial function and structure and establish the relationship between coronary lesions and distance of radiofrequency application. METHODS Six Landrac...

This paper gives a summary of the results of a radio frequency interference mitigation project. Radio frequency interference (RFI) is a problem radio astronomers are facing increasingly in recent years. The goals of this project were: 1) investigate the cost vs. benefits of real-time RFI flagging, 2) determine ways of statistically flagging RFI by doing noise simulations, and 3) to develop a vi...

In this memo we present a study of the attenuation of the radio frequency interference provided by the SKA core in the case of moving interferer (e.g. an aircraft). Identical simulations were carried out for both the Large N (a number of antennae) – Small D (diameter of antennae) and the Small N – Large D designs. The former design provides only a few dB greater attenuation. The attenuation of ...