An Approach to Noninvasive Analysis of Intracranial Pressure (ICP) Using an Ultrasonic Probe

Kuchiwaki, Hiroji; Itoh, Junki; Ishiguri, Hitoshi; Andoh, K.; Ogura, Satoshi; Sakuma, Nobumitsu; Takishita, Toshio

doi:10.1007/978-3-642-73987-3_3

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…We grossly assumed the 3-mm thickness of the skull (2460 m/s) and scalp to consist of a 3-mm layer of fat tissue (1476 ds-Ref. 10) and a 3-mm thick muscular layer (1568 m/s-Ref. 13).…”

Section: Methodsmentioning

confidence: 99%

“…These layers correlate with the skull bone, the dura mater (including the arachnoid membrane, summarized here as "dura mater"), and the brain substance. Changes in intensity of the ultrasound interference echoes from the dura mater were processed with a method using fast Fourier transformation (FFT) and Cepstrum.12 It was found in an experimental model of increased ICP that changes in intensity correlated with changes in ICP.g, 10 Our system consists of three main parts: A device with an ultrasound pulserheceiver and a small probe, a signal processor determining the ICP level by analyzing the interference echoes with each stroke of the heart beat, and a recorder of the continuous ultrasound wave forms of ICP through a time window via a peak detector. Using our system, a correlation between changes in amplitude of the ultrasound interference echoes and levels of ICP measured by a medical transducer have been well demonstrated in our experimental work^.^,'^ The present study is a preliminary report of examples of practical, as well as clinical applications, of the portion of our system recording the continuous wave forms of ICP through a time window via a peak detector.…”

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confidence: 99%

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Continuous recording of changes in intracranial pressure using interference echoes of ultrasonic wave: A preliminary report of practicality and clinical evaluation

Kuchiwaki

Inao

Andoh

et al. 1992

J of Clinical Ultrasound

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We attempted to examine intracranial pressure (ICP) noninvasively using probes receiving interference echoes of ultrasound from thin layers between the skull and the surface of the cerebrum. The reception of echo through bone flaps less than 5-mm thick was good. Normal adults (4) and patients (4) were examined by attaching ultrasound probes to the frontotemporal scalp. Recordings were performed during rest, Valsalva maneuver, hyperventilation, and pumping of a shunt-flushing device. Ultrasound recordings of ICP were compared with those of the scalp using two different time windows. The effect of scalp vessels on the ultrasound recordings of ICP was evaluated. The waves from a pressure transducer and the ultrasound probe were similar. This method was found to be useful for ICP recording.

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“…We grossly assumed the 3-mm thickness of the skull (2460 m/s) and scalp to consist of a 3-mm layer of fat tissue (1476 ds-Ref. 10) and a 3-mm thick muscular layer (1568 m/s-Ref. 13).…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Continuous recording of changes in intracranial pressure using interference echoes of ultrasonic wave: A preliminary report of practicality and clinical evaluation

Kuchiwaki

Inao

Andoh

et al. 1992

J of Clinical Ultrasound

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New non-invasive method and system for intracranial pressure waves' measurement

Ragauskas

Daubaris²,

Pamakštis³

et al.

1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium

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Non-invasive dynamic assessment of the elasticity of intracranial structures

Pranevicius

Bertašius

Pranevicius

et al. 1992

Acta Neurologica Scandinavica

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The dynamics of the speed of transcranial propagation of ultrasonic impulses has been established in humans. The possibility of detecting the changes in mechanical state of intracranial structures by dynamic measurement of the time of transcranial propagation of ultrasonic impulses (TUPT) has been ascertained for 10 healthy persons and 11 patients with different neurological pathology. The cerebrospinal fluid pressure (CSFP) was simultaneously monitored for 4 of the patients. Spontaneous fluctuations in TUPT and the changes caused by jugular veins, inferior vena cava compression, hyperventilation and temporary retention of breathing were detected for all investigated subjects. Spontaneous TUPT changes in the range of 0.25-0.85 x 10(-4) of initial mean value, which are related with cardiac and respiratory cycles, have been found in healthy persons while in patients they ranged from 0.07 x 10(-4) to 4.5 x 10(-4) of mean time. In healthy persons bilateral jugular vein compression leads to a decrease in TUPT by 1.8-3.0 x 10(-4), while the compression of inferior vena cava gives an increase in TUPT by 1.6-2.6 x 10(-4). Changes in TUPT during these maneuvers in neurological patients were found to be of different amplitude and direction. The rise of CSFP by 8.4-20.2 mmHg (mean 12.4 mmHg) was observed in 4 investigated patients during the compression of jugular veins or during the inferior vena cava compression, while the changes in TUPT obtained during each of such maneuvers were of opposite character. The results suggest that dynamic evaluation of acoustic impedance of intracranial system reflects the changes in the mechanical state of brain parenchyma.

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An Approach to Noninvasive Analysis of Intracranial Pressure (ICP) Using an Ultrasonic Probe

Cited by 5 publications

References 2 publications

Continuous recording of changes in intracranial pressure using interference echoes of ultrasonic wave: A preliminary report of practicality and clinical evaluation

Continuous recording of changes in intracranial pressure using interference echoes of ultrasonic wave: A preliminary report of practicality and clinical evaluation

New non-invasive method and system for intracranial pressure waves' measurement

Non-invasive dynamic assessment of the elasticity of intracranial structures

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