A non-contact and non-restricting respiration monitoring method for a sleeping person with a fiber-grating optical sensor

2003 ◽  
Vol 1 (3) ◽  
pp. 249-250 ◽  
Author(s):  
Hirooki AOKI ◽  
Yasuhiro TAKEMURA ◽  
Kazuhiro MIMURA ◽  
Hiroichi AOKI ◽  
Masato NAKAJIMA
Keyword(s):  
Optical Sensor ◽  
Fiber Grating ◽  
Monitoring Method ◽  
Respiration Monitoring

scholarly journals A new respiratory monitor system for four-dimensional computed tomography by measuring the pressure change on the back of body

2020 ◽  
Vol 93 (1108) ◽  
pp. 20190303
Author(s):  
Xianwen Zhang ◽  
Jintian Tang ◽  
Gregory C. Sharp ◽  
Lei Xiao ◽  
Shouping Xu ◽  
...  
Keyword(s):  
Body Movement ◽  
Pressure Change ◽  
Respiratory Monitoring ◽  
Time Shift ◽  
Monitoring Method ◽  
Respiration Monitoring ◽  
Number Of Patients ◽  
Significant Difference ◽  
The Difference ◽  
Position Management

Objective: A novel respiratory monitoring method based on the periodical pressure change on the patient’s back was proposed and assessed by applying to four-dimensional CT (4DCT) scanning. Methods: A pressure-based respiratory monitoring system is developed and validated by comparing to real-time position management (RPM) system. The pressure change and the RPM signal are compared with phase differences and correlations calculated. The 4DCT images are reconstructed by these two signals. Internal and skin artifacts due to mismatch between CT slices and respiratory phases are evaluated. Results: The pressure and RPM signals shows strong consistency (R = 0.68±0.19 (1SD)). The time shift is 0.26 ± 0.51 (1SD) s and the difference of breath cycle is 0.02 ± 0.17 (1SD) s. The quality of 4DCT images reconstructed by two signals is similar. For both methods, the number of patients with artifacts is eight and the maximum magnitudes of artifacts are 20 mm (internal) and 10 mm (skin). The average magnitudes are 8.8 mm (pressure) and 8.2 mm (RPM) for internal artifacts, and 5.2 mm (pressure) and 4.6 mm (RPM) for skin artifacts. The mean square gray value difference shows no significant difference (p = 0.52). Conclusion: The pressure signal provides qualified results for respiratory monitoring in 4DCT scanning, demonstrating its potential application for respiration monitoring in radiotherapy. Advances in knowledge: Pressure change on the back of body is a novel and promising method to monitor respiration in radiotherapy, which may improve treatment comfort and provide more information about respiration and body movement.

scholarly journals Respiration Monitoring for Premature Neonates in NICU

2019 ◽  
Vol 9 (23) ◽  
pp. 5246
Author(s):  
Yue Sun ◽  
Wenjin Wang ◽  
Xi Long ◽  
Mohammed Meftah ◽  
Tao Tan ◽  
...  
Keyword(s):  
Optical Flow ◽  
Premature Infants ◽  
Neonatal Intensive Care ◽  
Correlation Coefficients ◽  
Estimation Methods ◽  
Neonatal Intensive Care Units ◽  
Monitoring Method ◽  
Respiration Monitoring ◽  
Flow Estimation ◽  
Video Frames

In this paper, we investigate an automated pipeline to estimate respiration signals from videos for premature infants in neonatal intensive care units (NICUs). Two flow estimation methods, namely the conventional optical flow- and deep learning-based flow estimation methods, were employed and compared to estimate pixel motion vectors between adjacent video frames. The respiratory signal is further extracted via motion factorization. The proposed methods were evaluated by comparing our automated extracted respiration signals to that extracted from chest impedance on videos of five premature infants. The overall average cross-correlation coefficients are 0.70 for the optical flow-based method and 0.74 for the deep flow-based method. The average root mean-squared errors are 6.10 and 4.55 for the optical flow- and the deep flow-based methods, respectively. The experimental results are promising for further investigation and clinical application of the video-based respiration monitoring method for infants in NICUs.

scholarly journals Respiration monitoring in PACU using ventilation and gas exchange parameters

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hee Yong Kang ◽  
Ann Hee You ◽  
Youngsoon Kim ◽  
You Jeong Jeong ◽  
Geuk Young Jang ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Minute Ventilation ◽  
Coefficient Of Determination ◽  
Percentage Error ◽  
Gas Exchange Parameters ◽  
Impedance Tomography ◽  
Monitoring Method ◽  
Respiration Monitoring ◽  
Postoperative Respiratory Complications ◽  
Exchange Parameters

AbstractThe importance of perioperative respiration monitoring is highlighted by high incidences of postoperative respiratory complications unrelated to the original disease. The objectives of this pilot study were to (1) simultaneously acquire respiration rate (RR), tidal volume (TV), minute ventilation (MV), SpO2 and PetCO2 from patients in post-anesthesia care unit (PACU) and (2) identify a practical continuous respiration monitoring method by analyzing the acquired data in terms of their ability and reliability in assessing a patient’s respiratory status. Thirteen non-intubated patients completed this observational study. A portable electrical impedance tomography (EIT) device was used to acquire RREIT, TV and MV, while PetCO2, RRCap and SpO2 were measured by a Capnostream35. Hypoventilation and respiratory events, e.g., apnea and hypopnea, could be detected reliably using RREIT, TV and MV. PetCO2 and SpO2 provided the gas exchange information, but were unable to detect hypoventilation in a timely fashion. Although SpO2 was stable, the sidestream capnography using the oronasal cannula was often unstable and produced fluctuating PetCO2 values. The coefficient of determination (R2) value between RREIT and RRCap was 0.65 with a percentage error of 52.5%. Based on our results, we identified RR, TV, MV and SpO2 as a set of respiratory parameters for robust continuous respiration monitoring of non-intubated patients. Such a respiration monitor with both ventilation and gas exchange parameters would be reliable and could be useful not only for respiration monitoring, but in making PACU discharge decisions and adjusting opioid dosage on general hospital floor. Future studies are needed to evaluate the potential clinical utility of such an integrated respiration monitor.

scholarly journals Fiber Bragg Grating Monitoring of Full-bolt Axial Force of the Bolt in the Deep Strong Mining Roadway

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4242
Author(s):  
Peng Wang ◽  
Nong Zhang ◽  
Jiaguang Kan ◽  
Zhengzheng Xie ◽  
Qun Wei ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Axial Force ◽  
Growth Zone ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Monitoring Method ◽  
Mining Depth ◽  
Working Face ◽  
Before And After ◽  
Mine Roadway

With the increase of mining depth and strength, the evolution of bolt axial force is increasingly becoming important for ensuring the reliability and safety of support. To improve the problem of the existing coal mine roadway pressure-monitoring method, whereby it is difficult to continuously monitor the axial force of the bolt over a long period of time, a full rod fiber bragg grating (FBG) force-measuring bolt and system were designed based on the principle of fiber grating sensing. It was found that a trapezoidal groove is a relatively better groove. The linearity between the center wavelength offset of the fiber grating and the axial force was more than 0.99, and the conversion formula between the axial force of the bolt rod and the wavelength change of the fiber grating were obtained. The real-time monitoring revealed that the axial force of the bolt obviously changed before and after compression. The axial force distribution curve can be divided into the stable zone, growth zone, and peak zone. The influence of the roadway abutment pressure was approximately 130 m ahead of the working face, and the peak area was within the 25–35 m range of the advance working face. The axial force of the bolt rod at the end of the anchorage linearly increased with the tail end of the bolt, the axial force of the free segment was the largest, and the overall stress was essentially the same. The application results demonstrate the feasibility and effectiveness of the FBG full-length force bolt.

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