AI Article Synopsis
- Research has focused on using radar for non-contact heartbeat measurement, but the underlying physical mechanisms are not well understood.
- Many believe that radar detects small body movements linked to heartbeats, but there is uncertainty about whether it’s just surface movements or signals from internal organs.
- Recent experiments suggest that radar primarily captures reflections from the body’s surface, confirming its role in detecting human heartbeats.
Article Abstract
There has been research interest in using radar for contactless measurements of the human heartbeat for several years. While many systems have been demonstrated, not much attention have been given to the actual physical causes of why this work. The consensus seems to be that the radar senses small body movements correlated with heartbeats, but whether only the movements of the body surface or reflections from internal organs are also monitored have not been answered definitely. There has recently been proposed another theory that blood perfusion in the skin could be the main reason radars are able to detect heartbeats. In this paper, an experimental approach is given to determine the physical causes. The measurement results show that it is the body surface reflections that dominate radar measurements of human heartbeats.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1109/TBME.2012.2228263 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unraveling the neural dichotomy of consensus and idiosyncratic experiences in short video viewing.
Brain Cogn
January 2025
Key Laboratory of Brain, Cognition and Education Sciences, Ministry of Education, China. Electronic address:
Human experiences are inherently shaped by individual perspectives, leading to diverse interpretations of the same events. However, shared activities, such as communal film watching or sports viewing, underscore the dual nature of these experiences: collective joy arises through social interactions, while individual emotional responses are influenced by personal preferences. The neural mechanisms underlying this interplay between shared and idiosyncratic experiences, particularly in the context of reward processing, remain insufficiently explored.
View Article and Find Full Text PDFProtocol for assessing T cell receptor-mediated human T cell cytotoxicity.
STAR Protoc
January 2025
Brigham and Women's Hospital, Division of Rheumatology, Inflammation, and Immunity, Boston, MA, USA; Harvard Medical School, Boston, MA, USA. Electronic address:
Measuring the cytotoxicity of human T cells is a valuable but challenging task. We present a protocol for assessing the ability of polyclonal human T cells to kill target cells upon T cell receptor (TCR) triggering. We describe steps for preparing L and T cells for the assay and incubation of target cells with effector cells.
View Article and Find Full Text PDFEnd-to-End Crystal Structure Prediction from Powder X-Ray Diffraction.
Adv Sci (Weinh)
January 2025
DP Technology, Beijing, 100080, China.
Powder X-ray diffraction (PXRD) is a prevalent technique in materials characterization. While the analysis of PXRD often requires extensive human manual intervention, and most automated method only achieved at coarse-grained level. The more difficult and important task of fine-grained crystal structure prediction from PXRD remains unaddressed.
View Article and Find Full Text PDFSleep deprivation and corneal chronobiology: reevaluating overnight corneal changes.
Sci Rep
January 2025
Department of Ophthalmology, Faculty of Medicine, University of Debrecen, Nagyerdei blvd. 98, Debrecen, 4012, Hungary.
This prospective cohort study is aimed to investigate circadian variations in corneal parameters, focusing on sleep-deprived subjects. Sixty-four healthy individuals (age range: 21-76 years) actively participated in this study, undergoing examinations at least five times within a 24-hour timeframe. The analysis encompassed keratometric parameters of the cornea's front (F) and back (B) surfaces, refractive power in flattest and steepest axes (K1, K2), astigmatism (Astig) and its axis (Axis), aspheric coefficient (Asph), corneal pachymetry values of thinnest corneal thickness (Pachy Min) and corneal thickness in the center of the pupil (Pachy Pupil), volume relative to the 3 and 10 mm corneal diagonal (Vol D3, Vol D10) and surface variance index (ISV).
View Article and Find Full Text PDFIdentification of channel shifting patterns and bank erosion-prone sites and challenges of riverine livelihood in the lower Tista River basin.
Environ Sci Pollut Res Int
January 2025
Department of Geography, Rampurhat College, PO-Rampurhat, Dist-Birbhum, 731224, India.
In fluvial environments, the shifting of river channels and bank erosion are frequently caused by both natural and anthropogenic factors. Riverine hazards like bank erosion and course alterations offer severe issues to the riparian villages along the lower basin of the Tista River in India, which substantially influence the livelihoods of inhabitants living there. This research addressed river channel shifting tendency and identified major bank erosion-prone villages along the lower course of the Tista River and challenges to the livelihoods of the riparian people.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!