*  Dynamic time warping and machine learning for signal quality assessment of pulsatile signals. - Nuffield Department of Clinical...
In this work, we describe a beat-by-beat method for assessing the clinical utility of pulsatile waveforms, primarily recorded from cardiovascular blood volume or pressure changes, concentrating on the photoplethysmogram (PPG). Physiological blood flow is nonstationary, with pulses changing in height, width and morphology due to changes in heart rate, cardiac output, sensor type and hardware or software pre-processing requirements. Moreover, considerable inter-individual and sensor-location variability exists. Simple template matching methods are therefore inappropriate, and a patient-specific adaptive initialization is therefore required. We introduce dynamic time warping to stretch each beat to match a running template and combine it with several other features related to signal quality, including correlation and the percentage of the beat that appeared to be clipped. The features were then presented to a multi-layer perceptron neural network to learn the relationships between the parameters in the
  https://www.ndcn.ox.ac.uk/publications/349815
*  Results of ophthalmosonometry and supraorbital photoplethysmography in evaluating carotid arterial stenoses. | Circulation
Results of ophthalmosonometry and supraorbital photoplethysmography in evaluating carotid arterial stenoses.. L J Duke, E E ... Results of ophthalmosonometry and supraorbital photoplethysmography in evaluating carotid arterial stenoses.. L J Duke, E E ... Results of ophthalmosonometry and supraorbital photoplethysmography in evaluating carotid arterial stenoses.. L J Duke, E E ... or a combination of ophthalmosonometry and supraorbital photoplethysmography (SOPPG) to determine the presence or absence of a ...
  http://circ.ahajournals.org/content/60/2/127
*  Heart rate variability measurement using the second derivative photoplethysmogram - CDU eSpace
Photoplethysmography is an optical technique that has been developed for experimental use in vascular disease. Because of its ...
  http://espace.cdu.edu.au/view/cdu:36990
*  Patent US5137023 - Method and apparatus for monitoring blood analytes noninvasively by ... - Google Patents
The principles of photoplethysmography are applied to measure the change in light intensity caused by matrix absorption before ... The principles of photoplethysmography are applied to measure the change in light intensity caused by matrix absorption before ... The major relevance of photoplethysmography to the determination of blood glucose is that the change in the absorption of the ... The present invention is based on the principle of transmission and reflection photoplethysmography. Plethysmography refers to ...
  http://www.google.com/patents/US5137023?dq=6,967,448
*  Sensors | Free Full-Text | Comparison of Systolic Blood Pressure Values Obtained by Photoplethysmography and by Korotkoff...
In the current study, a non-invasive technique for systolic blood pressure (SBP) measurement based on the detection of photoplethysmographic (PPG) pulses during pressure-cuff deflation was compared to sphygmomanometry-the Korotkoff sounds technique. The PPG pulses disappear for cuff-pressures above the SBP value and reappear when the cuff-pressure decreases below the SBP value. One hundred and twenty examinations were performed on forty subjects. In 97 examinations the two methods differed by less than 3 mmHg. In nine examinations the SBP value measured by PPG was higher than that measured by sphygmomanometry by 5 mmHg or more. In only one examination the former was lower by 5 mmHg or more than the latter. The appearance of either the PPG pulses or the Korotkoff sounds assures that the artery under the cuff is open during systolic peak pressure. In the nine examinations mentioned above the PPG pulses were observed while Korotkoff sounds were not detected, despite the open artery during systole. In these
  http://www.mdpi.com/1424-8220/13/11/14797/notes
*  Patente US6699199 - Photoplethysmograph signal-to-noise line enhancement - Google Patentes
Modeling of Finger Photoplethysmography for Wearable Sensors.. 3. Asada et al. The Ring Sensor: a New Ambulatory Wearable ...
  http://www.google.es/patents/US6699199
*  METHOD AND APPARATUS FOR NONINVASIVE BLOOD PRESSURE MEASUREMENT USING PULSE OXIMETRY - Patent application
As noted, the photoplethysmography sensor 14 may be associated with the cuff 18. In one embodiment, the photoplethysmography ... In this manner, photoplethysmography signals may be used to more accurately determine Ps. From the Ps as well as the mean ... The photoplethysmography sensor 14 is engaged and actively monitoring the tissue (i.e., the emitter 30 is directing light into ... Accordingly, the photoplethysmography sensor 14 is applied to the patient in an area proximate the cuff 18 such that the ...
  http://www.patentsencyclopedia.com/app/20120215082
*  Segmented photoplethysmographic sensor with universal probe-end - Datex-Ohmeda, Inc.
However, there is a desire to expand the use of photoplethysmography into the monitoring of additional blood analytes such as ... One of the primary uses of photoplethysmography has been the monitoring of the oxygen saturation of a patient's blood. ... light at or exceeding the light power available from light emitting diodes that are typically used in photoplethysmography. The ...
  http://www.freepatentsonline.com/6014576.html
*  High-Throughput Alignment-Insensitive Optical Connector for Laser-Based Photoplethysmography - Patent application
0033] One embodiment of a high-throughput optical connection for laser-based photoplethysmography is shown in FIG. 2. It is a ... 0003] In the science of photoplethysmography, light is used to illuminate or trans-illuminate living tissue for the purpose of ... 0017] In addition to limiting the use of light guides in photoplethysmography to specialized applications, the problem of how ... User replaceable optical subsystem for laser-based photoplethysmography. 2013-02-28. Laser to fiber optical coupling in ...
  http://www.patentsencyclopedia.com/app/20120289799
*  An Overview of Fitness Technology: Heart Rate Monitors - News
Most wearables now use a heart rate measurement method called photoplethysmography, or PPG. In its simplistic form, PPG works ...
  https://www.allaboutcircuits.com/news/fitness-technology-heart-rate-monitors/
*  METHOD AND SYSTEM FOR CARRYING OUT PHOTOPLETHYSMOGRAPHY - Patent application
0001] The invention relates to a method of photoplethysmography, a system for carrying out photoplethysmography, and a computer ... 0035] Several embodiments of a system for remote photoplethysmography will be explained herein. Photoplethysmography is a ... 6 is a schematic diagram of a fourth system for remote photoplethysmography. DETAILED DESCRIPTION OF THE EMBODIMENTS [ ... 2 is a schematic diagram of a second system for remote photoplethysmography; and [0031] FIG. 3 is a schematic diagram of third ...
  http://www.patentsencyclopedia.com/app/20120197137
*  Photoplethysmogram - Wikipedia
"Photoplethysmography and its application in clinical physiological measurement". Physiol Meas. 28: R1-39. Mar 2007. doi:10.1088 ...
  https://en.wikipedia.org/wiki/Photoplethysmogram
*  Identification of Cerebral Artery Stenosis Using Bilateral Photoplethysmography
... Hyun Goo Kang,1 Seogki Lee,2 Han Uk Ryu,3 and ... simply discriminate between people with normal blood vessels and those with cerebral artery stenosis using photoplethysmography ...
  https://www.hindawi.com/journals/jhe/2018/3253519/abs/
*  Monitoring led wavelength shift in photoplethysmography - KEILBACH KEVIN A.
In one embodiment, a system for use in photoplethysmography includes a plurality of light signal emitters (. 20. A-D) within a ... 0002] Photoplethysmography involves the transmission of light signals through a tissue under test to non-invasively determine ... 0001] The present invention generally relates to the field of photoplethysmography, and more particularly to the indirect ...
  http://www.freepatentsonline.com/y2003/0073889.html
*  OSA | Nonconstrained Blood Pressure Measurement by Photoplethysmography
Young-Zoon Yoon and Gil-Won Yoon, "Nonconstrained Blood Pressure Measurement by Photoplethysmography," J. Opt. Soc. Korea 10, ... Blood pressure was predicted from photoplethysmography (PPG). To obtain PPG, backscattered light from a fingertip was measured ... Nonconstrained Blood Pressure Measurement by Photoplethysmography Young-Zoon Yoon and Gil-Won Yoon ... "Pulse transit time by R-wave-gated infrared photoplethysmography: review of the literature and personal experience," J. Clin. ...
  https://www.osapublishing.org/josk/abstract.cfm?uri=josk-10-2-91
*  Applied Sciences | Free Full-Text | Estimation of Mental Distress from Photoplethysmography
This paper introduces the design of a new wearable photoplethysmography (PPG) sensor and its assessment for mental distress ... This paper introduces the design of a new wearable photoplethysmography (PPG) sensor and its assessment for mental distress ... Keywords: distress estimation; wearable; heart rate variability; photoplethysmography distress estimation; wearable; heart rate ... "Estimation of Mental Distress from Photoplethysmography." Appl. Sci. 8, no. 1: 69. ...
  http://www.mdpi.com/2076-3417/8/1/69
*  Investigation of Five Algorithms for Selection of the Optimal Region of Interest in Smartphone Photoplethysmography
L.-M. Po, X. Xu, L. Feng, Y. Li, K.-W. Cheung, and C.-H. Cheung, "Frame adaptive ROI for photoplethysmography signal extraction ... K. H. Shelley, "Photoplethysmography: beyond the calculation of arterial oxygen saturation and heart rate," Anesthesia & ... J. Allen, "Photoplethysmography and its application in clinical physiological measurement," Physiological Measurement, vol. 28 ... S. Lu, H. Zhao, K. Ju et al., "Can photoplethysmography variability serve as an alternative approach to obtain heart rate ...
  https://www.hindawi.com/journals/js/2016/6830152/ref/
*  IR THERMOGRAPHY AND IMAGE PHOTOPLETHYSMOGRAPHY : NON-CONTACT MEDICAL COUNTER MEASURES FOR INFECTION SCREENING
The second part of thesis refers to the study of image photoplethysmography (IPPG), a cost-effective and flexible method for ... IR THERMOGRAPHY AND IMAGE PHOTOPLETHYSMOGRAPHY : NON-CONTACT MEDICAL COUNTER MEASURES FOR INFECTION SCREENING. ...
  https://drum.lib.umd.edu/handle/1903/19784
*  Abstract 15179: Photoplethysmography Using a Smartphone Application for Assessment of Ulnar Patency Prior to Transradial...
Abstract 15179: Photoplethysmography Using a Smartphone Application for Assessment of Ulnar Patency Prior to Transradial ... Abstract 15179: Photoplethysmography Using a Smartphone Application for Assessment of Ulnar Patency Prior to Transradial ... Abstract 15179: Photoplethysmography Using a Smartphone Application for Assessment of Ulnar Patency Prior to Transradial ... Abstract 15179: Photoplethysmography Using a Smartphone Application for Assessment of Ulnar Patency Prior to Transradial ...
  http://circ.ahajournals.org/content/134/Suppl_1/A15179
*  The combination of laser Doppler perfusion imaging and photoplethysmography is useful in the characterization of scleroderma...
The combination of laser Doppler perfusion imaging and photoplethysmography is useful in the characterization of scleroderma ... and photoplethysmography (PPG), respectively. Results: Both the mean value of mean perfusion and the mean value of sphygmic ...
  http://www.biomedsearch.com/nih/combination-laser-Doppler-perfusion-imaging/21338324.html