Simple photoplethysmography pulse encoding technique for communicating the detection of peripheral arterial disease-a proof of concept study.

Objective: To assess the feasibility of novel photoplethysmography (PPG) Pulse Sounder/Pulse Visualizer communication techniques for alerting the presence (or absence) of peripheral arterial disease (PAD).

Approach: Proof of concept evaluation using our previously published multi-site PPG pulse data set (110 participants included; age  >  40 years; 44% PAD by ankle brachial pressure index (ABPI)). Two main pulse encoding rules using the risetime as an example feature to mark each heartbeat in a 6 s analysis study window: if risetime at both great toes  ⩽time threshold ('no PAD' state) then heartbeat marked with a single 5 kHz audio tone; if risetime from either great toe  >  threshold ('PAD') then heartbeat marked with a distinct train of 5 kHz audio tones.

Evaluating the repeatability and set-up sensitivity of a large field of view distortion phantom and software for magnetic resonance-only radiotherapy.

Background And Purpose: Magnetic Resonance (MR)-only radiotherapy requires geometrically accurate MR images over the full scanner Field of View (FoV). This study aimed to investigate the repeatability of distortion measurements made using a commercial large FoV phantom and analysis software and the sensitivity of these measurements to small set-up errors.

Materials And Methods: Geometric distortion was measured using a commercial phantom and software with 2D and 3D acquisition sequences on three different MR scanners.

Athletes and the Aorta: Normal Adaptations and the Diagnosis and Management of Pathology.

Over a hundred years ago, physicians first recognized that participation in regular, vigorous training resulted in enlargement of the heart. Since that time, the term "athlete's heart" has entered the medical lexicon as a global expression encompassing the electrical, functional, and morphological adaptations that develop in response to physical training. Exercise-induced adaptations of the aorta, which is also exposed to large hemodynamic stresses during prolonged endurance exercise or resistance training, are less well recognized.

Novel photoplethysmography cardiovascular assessments in patients with Raynaud's phenomenon and systemic sclerosis: a pilot study.

Objective: Multisite photoplethysmography (PPG) cardiovascular assessments can evaluate endothelial, peripheral autonomic and arterial dysfunction. The aim of this pilot study was to investigate the potential clinical utility of the technology in assessing patients with SSc and primary RP (PRP).

Methods: Multisite PPG pulse measurements, a reference ankle brachial pressure index (ABPI) and a full clinical assessment were undertaken for three subject groups: SSc, PRP and controls.