Biomedical Instrumentation

Webster, John G.

doi:10.4018/978-1-4666-0122-2.ch008

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…HR measurement is an important factor that can provide information about changes in the blood circulation and heart activity; therefore, it is often a measured quantity in the medical environment. Today, various quantities, such as the ECG electrical signal, the acoustic signal, blood pressure changes in the circulatory system, changes in tissue volume as a result of volume changes in the circulatory system, changes in tissue impedance associated with changes in the blood volume in a specific tissue section or changes in blood flow velocity—due to changes in blood pressure in the circulatory system—are used for its determination [ 11 ].…”

Section: State Of the Artmentioning

confidence: 99%

Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study

Nedoma

Kepák

Fajkus

et al. 2018

Sensors

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The publication presents a comparative study of two fibre-optic sensors in the application of heart rate (HR) and respiratory rate (RR) monitoring of the human body. After consultation with clinical practitioners, two types of non-invasive measuring and analysis systems based on fibre Bragg grating (FBG) and fibre-optic interferometer (FOI) have been designed and assembled. These systems use probes (both patent pending) that have been encapsulated in the bio-compatible polydimethylsiloxane (PMDS). The main advantage of PDMS is that it is electrically non-conductive and, as well as optical fibres, has low permeability. The initial verification measurement of the system designed was performed on four subjects in a harsh magnetic resonance (MR) environment under the supervision of a senior radiology assistant. A follow-up comparative study was conducted, upon a consent of twenty volunteers, in a laboratory environment with a minimum motion load and discussed with a head doctor of the Radiodiagnostic Institute. The goal of the laboratory study was to perform measurements that would simulate as closely as possible the environment of harsh MR or the environment of long-term health care facilities, hospitals and clinics. Conventional HR and RR measurement systems based on ECG measurements and changes in the thoracic circumference were used as references. The data acquired was compared by the objective Bland–Altman (B–A) method and discussed with practitioners. The results obtained confirmed the functionality of the designed probes, both in the case of RR and HR measurements (for both types of B–A, more than 95% of the values lie within the ±1.96 SD range), while demonstrating higher accuracy of the interferometric probe (in case of the RR determination, 95.66% for the FOI probe and 95.53% for the FBG probe, in case of the HR determination, 96.22% for the FOI probe and 95.23% for the FBG probe).

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Section: State Of the Artmentioning

confidence: 99%

Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study

Nedoma

Kepák

Fajkus

et al. 2018

Sensors

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“…We designed a two-channel ECG amplifier to allow simultaneous ECG data recording from gel and dry electrodes. The amplifier design was adapted from Webster (2012). We built the amplifier around the Texas Instruments INA2126 micropower instrumentation amplifier in dual version.…”

Section: Ecg Amplifier Design and Data Acquisitionmentioning

confidence: 99%

Simultaneous comparison of 1 gel with 4 dry electrode types for electrocardiography

et al. 2015

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We designed a spandex tank top with dry electrodes for continuous electrocardiogram (ECG) recording. This pilot study determined the best fabric, the best electrode types, sizes, and locations. Optimal electrodes provide high signal to artifact ratio (SAR) and reliability by meeting the following criteria: 1) low baseline shift, 2) high adhesion, 3) good physical stability, 4) large effective area, 5) thin with high flexibility (Luo et al 1992). We compared electrodes from three main groups: Ag/AgCl gel electrode, commercial conductive rubber and foam-metal based electrodes. Ag/AgCl gel electrodes are easy to apply, make good body contact and do not slip during the course of an experiment. We found that higher SARs are obtained when electrode area is increased (40 mm diameter) and the two dry measurement electrodes are located on convex areas (over chest muscle) rather than concave areas (over sternum), so the spandex will apply light pressure to the dry electrode to yield good electrode to skin contact. We experimentally validated findings with 24 subjects: 12 men and 12 women wearing the tank top with gel and dry electrodes, by monitoring movements imitating daily life while continuously recording their ECGs.

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“…Pengukuran denyut jantung merupakan faktor penting yang dapat memberikan informasi tentang perubahan sirkulasi darah dan aktivitas jantung sehingga sering diukur dalam lingkungan medis. Saat ini, pengukuran dilakukan seperti sinyal listrik elektrokardiogram (EKG), sinyal akustik, perubahan tekanan darah dalam sistem peredaran darah, perubahan volume jaringan sebagai akibat dari perubahan volume dalam sistem peredaran darah, perubahan impedansi jaringan yang terkait dengan perubahan volume darah di bagian jaringan tertentu atau perubahan kecepatan aliran darah [1]. Pendekatan yang paling umum untuk menilai sinyal jantung dan pernapasan secara bersamaan adalah polisomnogram (PSG).…”

Section: Pendahuluanunclassified

Aplikasi Sistem Sensor Fiber Bragg Grating Untuk Pendeteksian Simulasi Denyut Jantung

Saktioto

2021

JKFI

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Heart rate detection still widely develops one to human behavior, so that efforts are regnired to investigrate other ways to more easily detect it. Currently, heart detection can be done without medical ceek up, such as using cellphones, watches, and others. Fiber Bragg Grating (FBG) can be used to detect the heart rate, in the form of pressure which causes a change in strain. FBG also has high sensitivity to strain. Heart rate detection can be measured in several ways such as using a telescope, but FBG has a high level of accuracy. This study aims to design and measure changes in the output power of the FBG and analyze the effect of strain changes on the FBG by loudspeaker vibration. Bragg wavelengths used are 1310 nm and 1550 nm with a power of 1 mW as a diode laser source and the output is measured by an optical power meter. The highest output power change at 1310 nm Bragg wavelength is 0.736 µW, while at 1550 nm wavelength it is 0.009 µW. The highest Bragg wavelength shift is at the Bragg 1310 nm wavelength of 0.598 nm, while at the Bragg 1550 nm wavelength it is 0.552 nm. The highest strain change at the Bragg 1310 nm wavelength is 576,186 µε, while at the Bragg 1550 nm wavelength it is 432,113 µε. This shows that the response at the Bragg 1310 nm wavelength is more sensitive than the Bragg 1550 nm wavelength.

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Biomedical Instrumentation

Cited by 4 publications

References 14 publications

Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study

Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study

Simultaneous comparison of 1 gel with 4 dry electrode types for electrocardiography

Aplikasi Sistem Sensor Fiber Bragg Grating Untuk Pendeteksian Simulasi Denyut Jantung

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