scholarly journals Examples of acquisition and application of biooptical signals

2019 ◽  
Vol 11 (2) ◽  
pp. 25
Author(s):  
Anna Romana Cysewska-Sobusiak
Keyword(s):  
Pulse Oximetry ◽  
Light Transmission ◽  
Medical Engineering ◽  
Objective Evaluation ◽  
Short Review ◽  
Scientific Activity ◽  
Diagnostic Methods ◽  
Sensor Technology ◽  
Arterial Blood ◽  
Light Flicker

Scientific activity of Division of Metrology and Optoelectronics with Poznan University of Poland (PUT) includes methods and systems used in modern electronic, optoelectronic, and biomedical metrology. Noninvasive diagnostic methods applied in medical engineering, with special interest in optoelectronic sensor technology and advanced methods of imaging, are considered in the paper. The author who was the Head of the Division presents the short review of some selected former results of studies related to biophotonics. Full Text: PDF ReferencesA. Cysewska-Sobusiak, "Powers and Limitations of Noninvasive Measurements Implemented in Pulse Oximetry", Biocybernetics and Biomedical Engineering 22 (2002). DirectLink J.G. Webster, Design of pulse oximeters (Bristol, IOP Publishing Ltd 1997). CrossRef T. Aoyagi, "Pulse oximetry: its invention, theory, and future", Journal of Anesthesia 17, 4 (2003). CrossRef A.A. Alian and K.H Shelley, "Photoplethysmography", Anesthesiology 28, 4 (2014). CrossRef F.A. Duck, Physical properties of tissue: a comprehensive reference book (San Diego, Academia Press 1990). CrossRef Z. Krawiecki, A. Cysewska-Sobusiak, G. Wiczyński, and A. Odon, "Modeling and measurements of light transmission through human tissues", Bull. Pol. Ac. Tech. 56, 2 (2008). DirectLink A. Cysewska-Sobusiak, "One-dimensional representation of light-tissue interaction for application in noninvasive oximetry", Opt. Eng. 36, 4 (1997). CrossRef D. Prokop, A. Cysewska-Sobusiak, and A. Hulewicz, "Monitoring of the Arterial Blood Waveforms with a Multi-Sensor System", Procedia Eng. 47 (2012). CrossRef A. Cysewska-Sobusiak, P. Skrzywanek, and A. Sowier, "Utilization of Miniprobes in Modern Endoscopic Ultrasonography", IEEE Sensors Journal 6, 5 (2006). CrossRef A. Cysewska-Sobusiak, G. Wiczyński, Z. Krawiecki, and A. Sowier, "Role of optical techniques in combined use of selected methods of medical imaging", Opto-Electron. Rev. 16, 2 (2008). CrossRef A. Cysewska-Sobusiak, M. Bołtrukiewicz, and J. Parzych, "Evaluation of fluorescence images acquired from oligonucleotide libraries", Optica Applicata 38, 2 (2008). DirectLink M. Jukiewicz and A. Cysewska-Sobusiak, "Stimuli design for SSVEP-based brain computer-interface", Intl. Journal of Electronics and Telecommunications 62, 2 (2016). CrossRef G. Wiczyński, "Inaccuracy of Short-Term Light Flicker Pst Indicator Measuring With a Flickermeter", IEEE Trans. on Power Delivery, 27, 2 (2012). CrossRef A. Hulewicz, "A New Approach to Objective Evaluation of Human Visual Acuity", Phot. Lett. Poland 6, 4 (2014). CrossRef A. Zielińska, K. Kiluk, M. Wojtkowski, and K. Komar, "System for psychophysical measurements of two-photon vision", Phot. Lett. Poland 11, 1 (2019). CrossRef

scholarly journals The Various Oximetric Techniques Used for the Evaluation of Blood Oxygenation

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4844
Author(s):  
Meir Nitzan ◽  
Itamar Nitzan ◽  
Yoel Arieli
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Near Infrared ◽  
Light Transmission ◽  
Venous Blood ◽  
Blood Oxygenation ◽  
Infrared Light ◽  
Cerebral Tissue ◽  
Peripheral Muscle ◽  
Arterial Blood

Adequate oxygen delivery to a tissue depends on sufficient oxygen content in arterial blood and blood flow to the tissue. Oximetry is a technique for the assessment of blood oxygenation by measurements of light transmission through the blood, which is based on the different absorption spectra of oxygenated and deoxygenated hemoglobin. Oxygen saturation in arterial blood provides information on the adequacy of respiration and is routinely measured in clinical settings, utilizing pulse oximetry. Oxygen saturation, in venous blood (SvO2) and in the entire blood in a tissue (StO2), is related to the blood supply to the tissue, and several oximetric techniques have been developed for their assessment. SvO2 can be measured non-invasively in the fingers, making use of modified pulse oximetry, and in the retina, using the modified Beer–Lambert Law. StO2 is measured in peripheral muscle and cerebral tissue by means of various modes of near infrared spectroscopy (NIRS), utilizing the relative transparency of infrared light in muscle and cerebral tissue. The primary problem of oximetry is the discrimination between absorption by hemoglobin and scattering by tissue elements in the attenuation measurement, and the various techniques developed for isolating the absorption effect are presented in the current review, with their limitations.

scholarly journals PULSE OXIMETER USAGE IN PATIENT COVID-19 TREATMENT : AT A GLANCE

2021 ◽  
Vol 5 (1) ◽  
pp. 53
Author(s):  
Amalia Ajrina
Keyword(s):  
Pulse Oximetry ◽  
Respiratory System ◽  
Pulse Oximeter ◽  
Severe Pneumonia ◽  
Short Review ◽  
Blood Oxygen ◽  
Basic Principles ◽  
Arterial Blood ◽  
Clinical Conditions ◽  
Ir Light

Background: The end of 2019, Wuhan experienced an insurgence of coronavirus within two months of this prolong pandemic. Patients with Covid-19 have chance in suffering a serious damage of respiratory system, which then lead to hypoxemia. The harmful of silent hypoxemia is that either the patients are remain untreated or they will not seek any treatment at all, though their blood oxygen levels (SpO2 levels) slowly decrease. Especially those who isolated at home. Pulse oximeter is a mini device that evaluate the level of arterial blood saturation. Purpose: This article gives a short review about the principle, application, advantage, and disadvantage of pulse oximetry in maintaining the Covid-19 patients with hypoxemia. Review: Two basic principles of pulse oximetry that are important: (a) to differentiate the oxyhemoglobin (HbO2 ) and deoxyhemoglobin (HHb), (b) to get the value of SpO2 from arterial compartment blood. How pulse oximeter detects SpO2 is based on the amount of red and IR light absorbed. Pulse oximeter can detect an abnormality of respiratory system in Covid-19 patients that may cannot be detected earlier. Pulse oximeter also helps diagnosing some severe pneumonia cases. It also can be realiable to diagnose an ARDS (Acute Respiratory Distress Syndroms) if the devices are found limited (WHO, 2020). Beside the advantages of pulse oximeter, there are some erroneous of readings. Conclusion: Pulse oximeter is a mini device which offers many advantages over its limitations. Limitation of pulse oximeter can be early detected and overcame with an introduction evaluation of clinical conditions of each patients.

scholarly journals Accuracy of two pulse-oximetry measurements for INTELLiVENT-ASV in mechanically ventilated patients: a prospective observational study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shinshu Katayama ◽  
Jun Shima ◽  
Ken Tonai ◽  
Kansuke Koyama ◽  
Shin Nunomiya
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Prospective Observational Study ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
Arterial Blood Gas ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Arterial Blood ◽  
Ventilated Patients

AbstractRecently, maintaining a certain oxygen saturation measured by pulse oximetry (SpO2) range in mechanically ventilated patients was recommended; attaching the INTELLiVENT-ASV to ventilators might be beneficial. We evaluated the SpO2 measurement accuracy of a Nihon Kohden and a Masimo monitor compared to actual arterial oxygen saturation (SaO2). SpO2 was simultaneously measured by a Nihon Kohden and Masimo monitor in patients consecutively admitted to a general intensive care unit and mechanically ventilated. Bland–Altman plots were used to compare measured SpO2 with actual SaO2. One hundred mechanically ventilated patients and 1497 arterial blood gas results were reviewed. Mean SaO2 values, Nihon Kohden SpO2 measurements, and Masimo SpO2 measurements were 95.7%, 96.4%, and 96.9%, respectively. The Nihon Kohden SpO2 measurements were less biased than Masimo measurements; their precision was not significantly different. Nihon Kohden and Masimo SpO2 measurements were not significantly different in the “SaO2 < 94%” group (P = 0.083). In the “94% ≤ SaO2 < 98%” and “SaO2 ≥ 98%” groups, there were significant differences between the Nihon Kohden and Masimo SpO2 measurements (P < 0.0001; P = 0.006; respectively). Therefore, when using automatically controlling oxygenation with INTELLiVENT-ASV in mechanically ventilated patients, the Nihon Kohden SpO2 sensor is preferable.Trial registration UMIN000027671. Registered 7 June 2017.

Pulse Oximetry: An Alternative Method for the Assessment of Oxygenation in Newborn Infants

PEDIATRICS ◽  
1987 ◽  
Vol 79 (4) ◽  
pp. 524-528
Author(s):  
Michael S. Jennis ◽  
Joyce L. Peabody
Keyword(s):  
Pulse Oximetry ◽  
Pulse Oximeter ◽  
Arterial Oxygen Saturation ◽  
Newborn Infants ◽  
Fetal Hemoglobin ◽  
Arterial Oxygen ◽  
Skin Injury ◽  
Reliable Technique ◽  
Arterial Blood

Continuous monitoring of oxygenation in sick newborns is vitally important. However, transcutaneous Po2 measurements have a number of limiations. Therefore, we report the use of the pulse oximeter for arterial oxygen saturation (Sao2) determination in 26 infants (birth weights 725 to 4,000 g, gestational ages 24 to 40 weeks, and postnatal ages one to 49 days). Fetal hemoglobin determinations were made on all infants and were repeated following transfusion. Sao2, readings from the pulse oximeter were compared with the Sao2 measured in vitro on simultaneously obtained arterial blood samples. The linear regression equation for 177 paired measurements was: y = 0.7x + 27.2; r = .9. However, the differences between measured Sao2 and the pulse oximeter Sao2 were significantly greater in samples with &gt; 50% fetal hemoglobin when compared with samples with &lt; 25% fetal hemoglobin (P &lt; .001). The pulse oximeter was easy to use, recorded trends in oxygenation instantaneously, and was not associated with skin injury. We conclude that pulse oximetry is a reliable technique for the continuous, noninvasive monitoring of oxygenation in newborn infants.

scholarly journals Energy Conversion Monitoring in Skin Tissue: A More Sensitive Measure of Hypoxia Occurring With Sleep Disordered Breathing Than Pulse Oximetry

2019 ◽  
Author(s):  
Guy M. Hatch ◽  
Liza Ashbrook ◽  
Aric A. Prather ◽  
Andrew D. Krystal
Keyword(s):  
Pulse Oximetry ◽  
Energy Conversion ◽  
Sleep Disordered Breathing ◽  
Skin Tissue ◽  
Current Standard ◽  
Blood Oxygen Saturation ◽  
Primary Snoring ◽  
Arterial Blood ◽  
Obstructive Sleep ◽  
Disordered Breathing

Pulse oximetry is the current standard for detecting drops in arterial blood oxygen saturation (SpO2) associated with obstructive sleep apnea and hypopnea events in polysomnographic (PSG) testing. In cases of hypoxic challenge, such as occurs during apneic events, regulatory mechanisms restrict blood flow to the skin to preferentially maintain SpO2 for more vital organs. As a result, a measure related to skin tissue oxygenation is likely to be more sensitive to inadequate breathing during sleep than pulse oximetry. Energy Conversion Monitoring (ECM) provides a method for measuring skin tissue oxygen-dependent energy conversion and, as such, is promising for more sensitively detecting sleep disordered breathing (SDB) events compared to pulse oximetry. We hypothesized that ECM would detect hypoxia occurring with SDB events associated with drops in SpO2 but also would detect hypoxic challenge occurring with SDB events not associated with drops in SpO2 (hypopneas defined by a drop in nasal pressure occurring in conjunction with an arousal, respiratory-related arousals, and primary snoring). Primary snoring is of particular interest with respect to the potential of ECM because it is statistically associated with co-morbidities of SDB, such as hypertension, but is not considered pathological because of the lack of a proximal measure of pathology occurring with PSG. In this article we review ECM technology and methodology, present preliminary data indicating that it detects hypoxia occurring in the skin during SDB events that is not detected as blood desaturation by pulse oximetry, and make the case that it is a promising tool for identifying pathology occurring at the mild end of the SDB spectrum.

scholarly journals РИЗИКИ ВПРОВАДЖЕННЯ ЕЛЕКТРОННИХ БІБЛІОМЕТРИЧНИХ СИСТЕМ ОЦІНЮВАННЯ ЕФЕКТИВНОСТІ ДІЯЛЬНОСТІ НАУКОВИХ ПРАЦІВНИКІВ

2015 ◽  
Vol 48 (4) ◽  
pp. 1
Author(s):  
Valeriy Yu. Bykov ◽  
Nataliia V. Soroko
Keyword(s):  
Objective Evaluation ◽  
Scientific Activity ◽  
Publication Activity ◽  
Google Scholar ◽  
Network Services ◽  
Electronic Systems ◽  
Scientific Publications ◽  
Scientometric Indicators ◽  
Personal Contribution

The article deals with the results of the analysis of international and domestic experience in the use of network services, which can independently evaluate the quality of electronic publications and scientists’ publication activity. It can be achieved by the analysis of the values of scientometric indicators included in the bibliometric open electronic systems. This approach is associated with certain risks of objective evaluation of researchers’ scientific activity efficiency. The conditions for the inclusion of scientific publications in the search systems like Google Scholar are considered. It is concluded that the scientometric base, which is today an international and widely used in practice, should be developed to provide a more adequate reflection of the character and level of scientists’ scientific activity, as well as their personal contribution to the development of certain areas of science.

scholarly journals THINKING IN TERMS OF VARIABLES: THE CONCEPT OF THE SHADOW

2015 ◽  
Vol 14 (3) ◽  
pp. 295-310
Author(s):  
Ayse Oguz Unver
Keyword(s):  
Science Education ◽  
Science Teachers ◽  
Prospective Teachers ◽  
Qualitative Data ◽  
Light Transmission ◽  
Scientific Activity ◽  
Measurement Tool ◽  
Object Size ◽  
Scientific Terms ◽  
Prospective Science Teachers

The aim of the research was to explore the ideas prospective science teachers (N=51) had about the variables of object size, shape and light transmission that have an impact on shadow formation, using a scientific activity based on Inquiry-Based Science Education (IBSE). In this qualitative study, the measurement tool comprises 3 questions. The first question examines how the participants define the concept of shadow while the second question focuses on the variables of the size of the object, its shape, and its light transmission. The participants were asked to explain whether these variables would produce a shadow. The last question was devised in the atmosphere of an activities laboratory in which the absorption and reflection properties of light were explored. The NVi10 program was utilized for data analysis. At the end of the research, it was observed that the prospective teachers were not able to define the concept of the shadow in scientific terms and even if they knew the basic variables related to shadow formation, they could not exactly explain new situations when the variables were manipulated. Key words: inquiry, prospective science teachers, qualitative data, shadow science, variables.

Arterial blood gases

2007 ◽  
pp. 319-326
Keyword(s):  
Decision Making ◽  
Pulse Oximetry ◽  
Respiratory Rate ◽  
Management Strategy ◽  
Blood Gases ◽  
Capillary Blood ◽  
Blood Gas ◽  
Arterial Blood Gas ◽  
Arterial Blood ◽  
Gas Measurements

Arterial blood gas (ABGs) analysis forms the cornerstone of emergency respiratory investigation. In many situations values obtained dictate management strategy and facilitate decision-making. It is an uncomfortable procedure for the patients and if repeated ABGs are required, consider whether less invasive measures, such as respiratory rate, pulse oximetry or capillary blood gas measurements could be used....

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