Development of a magnetic-resonance-compatible photoplethysmograph amplifier for behavioral and emotional studies

Chung, Soon−Cheol; Kwon, Ji-Hun; Lee, Bongsoo; Yi, Jeong-Han; Kim, Hyun-Jun; Tack, Gye−Rae

doi:10.3758/brm.40.1.342

Cited by 6 publications

(6 citation statements)

References 21 publications

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“…Analogous to Doppler flowmeters, PC MRI can give insight into the haemolymph flow distribution of the animal, which was found to change in undisturbed crabs and in response to temperature changes [13, 33]. Calculation of SV from PC MRI requires simultaneous HR measurements, provided by either fast single-slice CINE MRI scans or simultaneous IR-PPG recordings, as long as sensors are shielded from high-frequency electro-magnetic fields [40]. Employing such sensors, CINE MRI can be gated and used to study in more detail how different components of the cardiac cycle make up the IR-PPG signal.…”

Section: Discussionmentioning

confidence: 99%

Non-invasive quantification of cardiac stroke volume in the edible crab Cancer pagurus

et al. 2019

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BackgroundBrachyuran crabs can effectively modulate cardiac stroke volume independently of heart rate in response to abiotic drivers. Non-invasive techniques can help to improve the understanding of cardiac performance parameters of these animals. This study demonstrates the in vivo quantification of cardiac performance parameters through magnetic resonance imaging (MRI) on the edible crab Cancer pagurus. Furthermore, the suitability of signal integrals of infra-red photoplethysmographs as a qualitative tool is assessed under severe hypoxia.ResultsMulti-slice self-gated cardiac cinematic (CINE) MRI revealed the structure and motion of the ventricle to quantify heart rates, end-diastolic volume, end-systolic volume, stroke volume and ejection fraction. CINE MRI showed that stroke volumes increased under hypoxia because of a reduction of end-systolic volumes at constant end-diastolic volumes. Plethysmograph recordings allowed for automated heart rate measurements but determination of a qualitative stroke volume proxy strongly depended on the position of the sensor on the animal. Both techniques revealed a doubling in stroke volumes after 6 h under severe hypoxia (water PO2 = 15% air saturation).ConclusionsMRI has allowed for detailed descriptions of cardiac performance in intact animals under hypoxia. The temporal resolution of quantitative non-invasive CINE MRI is limited but should encourage further refining. The stroke volume proxy based on plethysmograph recordings is feasible to complement other cardiac measurements over time. The presented methods allow for non-destructive in vivo determinations of multiple cardiac performance parameters, with the possibility to study neuro-hormonal or environmental effects on decapod cardio physiology.

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Section: Discussionmentioning

confidence: 99%

Non-invasive quantification of cardiac stroke volume in the edible crab Cancer pagurus

et al. 2019

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“…Investigations on the mutual relationships between the skin conductance response (SCR) and fMRI have been partially studied, but are insufficient to clearly examine both central and peripheral nerves (Nagai et al, 2004;Williams et al, 2001). Thus, it is necessary to examine such mechanisms utilized by the CNS and PNS and to study the mutual relationships through the simultaneous measurement of fMRI and physiological signals (Chung et al, 2006(Chung et al, , 2008Demmel, Ridt, & Olbrich, 2000;Nagai et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…To minimize the distortion of MR images, the length of the transmitter was minimized, the measuring instrument was shielded, and the use of metallic materials was minimized (Chung et al, 2006(Chung et al, , 2008Liu et al, 2000;Obler, Köstler, Weber, Mack, & Becker, 1999). On the basis of these techniques, it was possible to perform functional magnetic resonance imaging (fMRI) and receive an electroencephalogram (EEG) signal simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Development of a Magnetic Resonance-Compatible Galvanic Skin Response Measurement System Using Optic Signal

Lim

Park

Choi

et al. 2009

International Journal of Neuroscience

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The purpose of the current study is to develop a magnetic resonance (MR)-compatible galvanic skin response (GSR) measurement system that can measure the GSR signal during MR image acquisition. If GSR signals are measured simultaneously with the acquisition of MR images, there can be a mutual interference effect. The present system was designed to block noises caused by the main magnetic field, the gradient magnetic field, and the radio frequency (RF) pulse when MR images are acquired. To minimize the distortion of MR images, the GSR measurement system was shielded. Especially, this system used analog, not digital, elements in order to remove any possible effects on MR images. An RF-interference-free optical data link using the pulse-width modulation technique was adopted in order to transmit GSR signals measured inside the MR room. The experiment verified that a reliable GSR signal can be obtained without deteriorating the MR image. It is expected that this system can be used for diverse medical and neuroscience studies.

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“…Photoplethysmogram (PPG) measurements are generally conducted using an LED/photo detector pair placed on the skin near each other. To utilize this type of measurement in the MRI environment, light generated by an LED must be guided inside the MRI room by an MR-compatible fibre whose other end is attached on the patient's skin [3][4][5]. Light reflected back from tissue is then guided by a receiver fibre to a photo detector placed outside the MRI room.…”

Section: Introductionmentioning

confidence: 99%

Human Heart Pulse Wave Responses Measured Simultaneously at Several Sensor Placements by Two MR-Compatible Fibre Optic Methods

et al. 2012

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This paper presents experimental measurements conducted using two noninvasive fibre optic methods for detecting heart pulse waves in the human body. Both methods can be used in conjunction with magnetic resonance imaging (MRI). For comparison, the paper also performs an MRI-compatible electrocardiogram (ECG) measurement. By the simultaneous use of different measurement methods, the propagation of pressure waves generated by each heart pulse can be sensed extensively in different areas of the human body and at different depths, for example, on the chest and forehead and at the fingertip. An accurate determination of a pulse wave allows calculating the pulse transit time (PTT) of a particular heart pulse in different parts of the human body. This result can then be used to estimate the pulse wave velocity of blood flow in different places. Both measurement methods are realized using magnetic resonance-compatible fibres, which makes the methods applicable to the MRI environment. One of the developed sensors is an extraordinary accelerometer sensor, while the other one is a more common sensor based on photoplethysmography. All measurements, involving several test patients, were performed both inside and outside an MRI room. Measurements inside the MRI room were conducted using a 3-Tesla strength closed MRI scanner in the Department of Diagnostic Radiology at the Oulu University Hospital.

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Development of a magnetic-resonance-compatible photoplethysmograph amplifier for behavioral and emotional studies

Cited by 6 publications

References 21 publications

Non-invasive quantification of cardiac stroke volume in the edible crab Cancer pagurus

Non-invasive quantification of cardiac stroke volume in the edible crab Cancer pagurus

Development of a Magnetic Resonance-Compatible Galvanic Skin Response Measurement System Using Optic Signal

Human Heart Pulse Wave Responses Measured Simultaneously at Several Sensor Placements by Two MR-Compatible Fibre Optic Methods

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