Feasibility of neonatal lung imaging using electrical impedance tomography

Taktak, A.; Spencer, Andy; Record, Paul; Gadd, R.; Rolfe, P.

doi:10.1016/0378-3782(95)01700-3

Cited by 13 publications

(14 citation statements)

References 9 publications

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“…Although the current EIT measurements were performed in a similar environment, the novel evaluation with the f‐EIT technique markedly improved the images. This is apparent in comparison with the low‐quality thoracic EIT image 22 obtained under comparable measuring conditions using current injection at a fixed frequency. The simple evaluation of the EIT data using only two instantaneous points from the measurement, expected to correspond with inspiration and expiration, 22 made the generated image strongly dependent on irregularities in the breathing pattern, cardiac events, movement artifacts, or noise.…”

Section: Discussionmentioning

confidence: 61%

“…In harmony with the postulated most probable future clinical use of EIT in respiratory applications, 19‐21 the EIT measurements in infants were almost exclusively performed on the thorax. Thoracic EIT images of the neonatal thorax were obtained using electrical current injection of either single 22 or multiple frequencies. 23,24 The quality of the obtained images was rather low due to the difficulties associated with EIT measurements in the intensive care field and the specific features of neonatal impedance measurements.…”

Section: Discussionmentioning

confidence: 99%

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Monitoring Regional Lung Ventilation by Functional Electrical Impedance Tomography during Assisted Ventilation^a

Frerichs¹,

Hahn²,

Schiffmann

et al. 1999

Annals of the New York Academy of Sciences

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A new approach in discriminating the regional air volume changes in the lungs associated with either spontaneous or mechanical ventilation during assisted ventilation is presented. Impedance data are obtained by conventional electrical impedance tomography (EIT). The data are filtered in the range of either the spontaneous or the ventilator rate and processed by the functional EIT (f-EIT) evaluation technique, whereby the variation of the respective EIT data with time is determined and imaged. EIT measurements performed in an infant during synchronized intermittent mandatory ventilation were evaluated with this method and indicated that the specific local lung volume swings related to spontaneous and mechanical inhalations can be separated and imaged as tomograms. This noninvasive approach may become useful in optimizing the ventilatory pattern during advanced forms of artificial ventilation and may help the clinician in the therapy management of individual patients.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Monitoring Regional Lung Ventilation by Functional Electrical Impedance Tomography during Assisted Ventilation^a

Frerichs¹,

Hahn²,

Schiffmann

et al. 1999

Annals of the New York Academy of Sciences

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“…In spite of multiple positive features of EIT (non-invasiveness, no exposition to radiation, portability, bedside application), which favour its use in neonatal and paediatric patients, only a few EIT studies in children currently exist [12,23,24,25,26]. The quality of the EIT images produced so far has been partly disappointing due to the technical limitations of EIT hardware and evaluation procedures applied [24]. The current results demonstrate that EIT images of good quality can be generated even from noisy data if long data series are acquired and processed by advanced evaluation tools.…”

Section: Discussionmentioning

confidence: 99%

Non-invasive radiation-free monitoring of regional lung ventilation in critically ill infants

et al. 2001

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“…2(b)]. It is given by (3) where and are respectively the positive and negative supply voltages, is the overdrive voltage of transistor , and is the voltage across .…”

Section: B Transconductance Stagementioning

confidence: 99%

High-Power CMOS Current Driver With Accurate Transconductance for Electrical Impedance Tomography

Constantinou

Triantis

Bayford

et al. 2014

IEEE Trans. Biomed. Circuits Syst.

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Current drivers are fundamental circuits in bioimpedance measurements including electrical impedance tomography (EIT). In the case of EIT, the current driver is required to have a large output impedance to guarantee high current accuracy over a wide range of load impedance values. This paper presents an integrated current driver which meets these requirements and is capable of delivering large sinusoidal currents to the load. The current driver employs a differential architecture and negative feedback, the latter allowing the output current to be accurately set by the ratio of the input voltage to a resistor value. The circuit was fabricated in a 0.6- μm high-voltage CMOS process technology and its core occupies a silicon area of 0.64 mm (2) . It operates from a ± 9 V power supply and can deliver output currents up to 5 mA p-p. The accuracy of the maximum output current is within 0.41% up to 500 kHz, reducing to 0.47% at 1 MHz with a total harmonic distortion of 0.69%. The output impedance is 665 k Ω at 100 kHz and 372 k Ω at 500 kHz.

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Feasibility of neonatal lung imaging using electrical impedance tomography

Cited by 13 publications

References 9 publications

Monitoring Regional Lung Ventilation by Functional Electrical Impedance Tomography during Assisted Ventilation^a

Monitoring Regional Lung Ventilation by Functional Electrical Impedance Tomography during Assisted Ventilation^a

Non-invasive radiation-free monitoring of regional lung ventilation in critically ill infants

High-Power CMOS Current Driver With Accurate Transconductance for Electrical Impedance Tomography

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Feasibility of neonatal lung imaging using electrical impedance tomography

Cited by 13 publications

References 9 publications

Monitoring Regional Lung Ventilation by Functional Electrical Impedance Tomography during Assisted Ventilationa

Monitoring Regional Lung Ventilation by Functional Electrical Impedance Tomography during Assisted Ventilationa

Non-invasive radiation-free monitoring of regional lung ventilation in critically ill infants

High-Power CMOS Current Driver With Accurate Transconductance for Electrical Impedance Tomography

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Product

Resources

About

Monitoring Regional Lung Ventilation by Functional Electrical Impedance Tomography during Assisted Ventilation^a

Monitoring Regional Lung Ventilation by Functional Electrical Impedance Tomography during Assisted Ventilation^a