Quest for the ultimate cardiac CT scanner

Silence as the Ultimate Fulfillment of the Philosophical Quest

The Quest for the Ultimate Anisotropic Banach Space

We present a new scale U p (s < −t < 0 and 1 ≤ p < ∞) of anisotropic Banach spaces, defined via Paley–Littlewood, on which the transfer operator Lgφ = (g · φ) ◦ T−1 associated to a hyperbolic dynamical system T has good spectral properties. When p = 1 and t is an integer, the spaces are analogous to the “geometric” spaces Bt,|s+t| considered by Gouëzel and Liverani [26]. When p > 1 and −1 + 1/p...

Cardiac arrhythmias: The quest for a cure

During the last 40 years, much progress has been made in our understanding and management of cardiac arrhythmias. A major step in the late 1960s was to combine programmed electrical stimulation of the heart with intracardiac activation recording. This allowed: 1) localization of the site of the block in the atrioventricular conduction system in patients with bradycardia; and 2) identification o...

Designing and developing an in-house CCD based optical CT scanner for gel dosimetry

Introduction: Measurement of the complex 3D radiation dose distribution created with advanced radiotherapy techniques such as IMRT and SRS became very important. Polymer gel dosimetry (PGD) is proposed method to recording this dose distribution. MRI, X-ray CT, ultrasound, spectrophotometry and optical CT scanners can be used for readout of Polymer gel dosimeters. Although MRI i...

NPL Cs fountain frequency standards and the quest for the ultimate accuracy

NPL operates a system of two primary caesium fountain clocks consisting of a fully characterised standard NPL-CsF2 together with a new standard NPL-CsF3, which has recently become operational. Both fountains feature a single-stage vapour-loaded magneto-optical trap as the source of cold atoms and an approximate cancellation of the potentially large cold collision frequency shift. As a result, t...