Electromagnetic compatibility of wireless medical telemetry systems and light-emitting diode (LED) lamps

Ishida, Kai; Arie, Sazu; Gotoh, Kunihito; Hanada, Eisuke; Hirose, M.; Matsumoto, Yasushi

doi:10.15199/48.2018.02.07

Cited by 12 publications

(6 citation statements)

References 1 publication

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“…When L B and L t1 were compared, their tendencies were the same, with the intercept component of LB being only approximately 3 dB larger than that of Lt1 (equations (5) and (9), respectively). In contrast, when L B and L t2 were compared, L t2 increased abruptly with d 4 with respect to the increase with d 2 for LB (equations (5) and (10), respectively). Therefore, the radio wave output was reversed after the break point.…”

Section: A) Distance Characteristics Of Radio Wave Output Using the Rmentioning

confidence: 91%

“…The transmission power (P t ) and the reception power (P r ) are calculated from the transmission formula of the Friis Transmission Equation using the antenna gains (G t , G r ), the propagation distance (d), and the wavelength (λ) [8]. The free space radio propagation loss (L f ) was calculated from equation (4). Assuming that isotropic antennas were used for both the transmitting and receiving antennas, the basic freespace model propagation loss (L B ; units: dB) was calculated using equation (5).…”

Section: Free-space Propagation Modelmentioning

confidence: 99%

“…In previous research, although the electromagnetic interference between the WMTS and equipment such as a light-emitting diode (LED) has been demonstrated, the results presented did not represent a performance evaluation of the WMTT itself [3,4,5]. In addition, another report measured the reception limit distance to determine whether a signal can be received [6].…”

Section: Introductionmentioning

confidence: 99%

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Fundamental Study of Quantitative Evaluation of Radio Wave Output of Wireless Medical Telemetry Transmitters Operable in Medical Field

Fujii¹,

Kishimoto²,

Inoue³

2020

GJMR

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Wireless medical telemetry systems (WMTSs) are important medical equipment for monitoring of biological information such as the electrocardiogram of a patient in a remote location in real time. However, because WMTSs have characteristically used channels that are unique to the radio wave spectrum, many institutions have not previously managed WMTSs. Therefore, we examined a method for quantitative evaluation of the radio wave output of a wireless medical telemetry transmitter (WMTT) that can even be implemented in the medical field. In the experiments, we demonstrated the possibility of use of the method for quantitative evaluation of WMTT radio wave output in the medical field using two types of radio wave propagation model: a free-space propagation model and a two-ray ground reflection model. To determine the reference threshold value for use of each model, a breakpoint was found to be important to grasp the change point between short distance and long distance. It was indicated that the measured value was lower than the theoretical value below the breakpoint, while the measured value was slightly higher than the theoretical value beyond the breakpoint.

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Section: A) Distance Characteristics Of Radio Wave Output Using the Rmentioning

confidence: 91%

Section: Free-space Propagation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fundamental Study of Quantitative Evaluation of Radio Wave Output of Wireless Medical Telemetry Transmitters Operable in Medical Field

Fujii¹,

Kishimoto²,

Inoue³

2020

GJMR

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show abstract

“…In recent years, WMTSs have encountered a fatal electromagnetic interference problem caused by electromagnetic noise emitted from LED lamps [1] since the receiving antennas of WMTSs are, in many cases, installed in the ceiling of patient rooms or the corridors of wards at short distances from LED lamps owing to space or structural limitations [2]. Since this interference phenomenon is a life-threatening problem in some cases, it is strongly desired to formulate guidelines on the use of WMTSs and LED lamps in hospitals.…”

Section: Introductionmentioning

confidence: 99%

Impact of LED lamp noise on receiver sensitivity of wireless medical telemetry system

Ishida

Arie

et al. 2018

IEICE ComEX

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To evaluate the electromagnetic interference (EMI) in a wireless medical telemetry system (WMTS) caused by LED lamp emission, the statistical characteristics of noise and its impact on the receiver sensitivity of the WMTS were investigated. Noise from LED lamp is generally wideband owing to high-speed switching, but the WMTS employs narrow-band reception of 8.5 kHz. The amplitude probability distribution of band-limited noise from LED lamp agrees well with that of Gaussian noise with average power equal to that of band-limited LED noise. The increase in the required signal power of the WMTS for critical reception, caused by LED noise, was almost the same as that in the case of purely Gaussian noise with equal power. The above results indicate that LED noise interfering with a WMTS channel can be well modeled by Gaussian noise, and that the interference effect can be simply represented by the reduction in the receiving carrier-tonoise ratio (CNR), enabling easier evaluation of the impact of interference in the WMTS by using the CNR.

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“…Shadowless lighting has been used in the surgical rooms to improve the lighting of the operative field. The use of LED, which comes together with switching power supply, may cause EMI with some wireless communications and broadcasts in the surgical room [6][7][8]. Electromagnetic tracking based surgical navigation may have metal instruments in the operating environment, which affect the magnetic field.…”

mentioning

confidence: 99%

Assessment of Electric and Magnetic Fields Exposures for Different Types of Street Lights

Azrin*,

Muhamad,

Nazaruddin

et al. 2019

IJRTE

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The use of solid-state lightings using energy saving lights such as light emitting diodes (LEDs), High Pressure Sodium Vapour (HPSV) and induction light in the illumination has represented a major technological breakthrough in recent years. Several recent studies focus on the development and performance of energy saving street lighting systems such as LED, induction etc. These modern lamps use electronic ballasts contain a switching power supply circuit typically operate in the range of 20kHz to 60kHz to achieve low power consumption in which may cause interference to communication equipment as well as health effect to human body, which is not an issue in traditional electromagnetic 60Hz ballasts. This paper investigates the electromagnetic and electric field exposure to human body from three street lights systems; LED, HPSV and Induction lights. The electromagnetic and electric field measurement are conducted in the laboratory that represents a controlled environment in which free from external factors or interferences. The electromagnetic and electric field exposure measurements are conducted using the Aaronia SPECTRAN hand held spectrum analyzer model NF-5030 on five streetlights from three different types in accordance to MS2230-2009 standard. The results presented in this paper can be utilized as references for measurement in open space that may have some interferences from other sources as well.

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Electromagnetic compatibility of wireless medical telemetry systems and light-emitting diode (LED) lamps

Cited by 12 publications

References 1 publication

Fundamental Study of Quantitative Evaluation of Radio Wave Output of Wireless Medical Telemetry Transmitters Operable in Medical Field

Fundamental Study of Quantitative Evaluation of Radio Wave Output of Wireless Medical Telemetry Transmitters Operable in Medical Field

Impact of LED lamp noise on receiver sensitivity of wireless medical telemetry system

Assessment of Electric and Magnetic Fields Exposures for Different Types of Street Lights

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