118,176 research outputs found
Non contact cardiac monitoring from carotid artery using optical vibrocardiography
No full textThe aim of the present work is to establish a protocol for monitoring the cardiac activity measuring the skin surface vibrations of the main neck vessels, caused by vascular wall motion in carotid artery. The method is based on the optical recording of the movements of the neck by means of laser Doppler interferometry.
The ECG signal and the velocity of vibration of the skin in correspondence of the carotid artery (named optical vibrocardiography: VCG) have been simultaneously recorded on five healthy subjects. Standard heart rate variability tests have been carried out. The capability of VCG signals to be used as a surrogate of the ECG in assessing both cardiac rate and heart rate variability (HRV) has been tested using time and spectral descriptors, and specific statistical analysis. Mean differences have been found lower than 3.13%.
Optical vibrocardiography might be a simple approach to the clinical practice of cardiovascular screening, in particular in harsh environment, such as MR clinical practice, where ECG recordings are corrupted by artefacts and ECG cables might represent an hazard for the patients
Clinicals results related to the use of the tissuetech autograft system in the treatment of diabetic foot ulceration
No full textA novel fiber optic sensor for multiple and simultaneous measurement of vibration velocity
No full textSimultaneous and multipoint assessment of vibration velocities is an important issue for the
development of advanced noncontact vibrometers. In this article a novel fiber optic vibrometer is
presented. The architecture of the sensor is based on a simple optical layout and it is characterized
by multiple fiber optic interferometric sensors which are operated in the homodyne mode. Optical
configuration and operation of the single-point version of the sensor, as well as the two-points
measurement version, are described and typical measured signals with the operating range are
shown. The sensor can easily be configured in order to perform a higher number of point
measurements. Some details regarding signal acquisition and processing are also given and the ways
in which Doppler demodulation is performed are discussed. Finally tests with sinusoidal target
excitation in the range 0–1.8 kHz have been conducted
Tissuetech Autograft System nel trattamento delle ulcere del piede diabetico: risultati clinici
No full textGuest Editorial Special Section on IEEE MeMeA 2019 Metrological Point of View in Medical Measurements
No full textSince the first workshop held in Italy in 2006, the IEEE International Symposium on Medical Measurements and Application has grown constantly, year after year reaching its 14th edition, which was held in Istanbul, Turkey, on June 26-28, 2019. For the first time, researchers working in the field of medical measurements, from academia and industry, met at the interaction of the two continents, Europe and Asia, in a magnificent city so rich of historical elements. This was another excellent opportunity in the Symposium's history to spread worldwide the exchange of knowledge, experience, and advances in research on instrumentation and measurements in medicine and healthcare
Methods for the metrological characterization of wearable devices for the measurement of physiological signals: state of the art and future challenges
No full textWearable devices are rapidly spreading in many different application fields and with diverse measurement accuracy targets. However, data on their metrological characterization are very often missing or obtained with non-standardized methods, hence resulting in barely comparable results. The aim of this review paper is to discuss the existing methods for the metrological characterization of wearable sensors exploited for the measurement of physiological signals, highlighting the room for research still available in this field. Furthermore, as a case study, the authors report a customized method they have tuned for the validation of wireless electrocardiographic monitors. The literature provides a plethora of test/validation procedures, but there is no shared consensus on test parameters (e.g. test population size, test protocol, output parameters of validation procedure, etc.); on the other hand, manufacturers rarely provide measurement accuracy values and, even when they do, the test protocol and data processing pipelines are generally not disclosed. Given the increasing interest and demand of wearable sensors also for medical and diagnostic purposes, the metrological performance of such devices should be always considered, to be able to adequately interpret the results and always deliver them associated with the related measurement accuracy. • The sensor metrological performance should be always properly considered. • There are no standard methods for wearable sensors metrological characterization. • It is important to define rigorous test protocols, easily tunable for specific target applications
Design and development of an electro-optic measurement system for 3D topographic surveys: application to skin nevoid lesion
No full text
Wearables for health and fitness: Measurement characteristics and accuracy
No full textTo date, wearable devices are increasingly widespread among different kinds of users (e.g. sport people, patients, but also young and adult people in general) to monitor physiological parameters (e.g. heart rate, skin temperature, steps and energy expenditure), depicting the subject's physical activity pattern during different activities. Nonetheless, an insufficient attention is paid to the measurement characteristics and the accuracy of these devices, which, on the contrary, are of utmost importance, especially if the wearable is used for health or fitness purposes since uncertainty affects the result itself. The aim of this work is to analyze the performances of wearable devices and the measurement procedure used to validate them with respect to gold standard instruments, such as electrocardiogram for cardiac parameters or calorimetry for energy expenditure. What clearly appears is the lack of a standard test protocol in the validation process, as well as a large variability in the expression of metrological characteristics of this class of measurement device (e.g. referring to accuracy, some authors use bias, others absolute error). Therefore, in the field of wearable devices research it would be fundamental to identify some common measurement parameters and to devise a kind of guidelines, in order to obtain repeatable and inter-comparable data that can be reliably compared
- …
