| Presentation | 2012-10-27 Prediction Method of Noninvasive Acoustic Intracranial Pressure Measurement in the Ear Canal Hiroto NAKANO, Kenji FURIHATA, Tsuyoshi TADA, Jun NAKANO, Satoshi YASUMOTO, Norio KOIKE, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Intracranial pressure (ICP) can be assessed using infrasound because tympanic membrane displacement results from the transmission of ICP waves via the cochlear duct to the inner ear and then via the oval window to the auditory ossicles of the middle ear. The relationship between the infrasound pressures from the tympanic membrane (ear canal pressure (ECP)), which is detected using an earplug embedded with a low-frequency microphone, and the carotid artery (carotid artery pressure (CAP)), which is detected using a bell type stethoscope fitted with the same microphone, can be quantitatively characterized using a technique of systems analysis. This method does not allow us to measure absolute ICP levels. An elastance is derived from the ratio of the measured pressure (ECP_Δ_p) and volume changes (CAP_ΔV). The correction coefficient α of the elastance in two body positions is derived from magnetic resonance (MR) imaging measurements of cerebrospinal fluid (CSF) and blood flow. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Intracranial pressure / Tympanic membrane displacement / Carotid artery / Elastance |
| Paper # | EA2012-70 |
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| Committee | EA |
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| Conference Date | 2012/10/20(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Engineering Acoustics (EA) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Prediction Method of Noninvasive Acoustic Intracranial Pressure Measurement in the Ear Canal |
| Sub Title (in English) | |
| Keyword(1) | Intracranial pressure |
| Keyword(2) | Tympanic membrane displacement |
| Keyword(3) | Carotid artery |
| Keyword(4) | Elastance |
| 1st Author's Name | Hiroto NAKANO |
| 1st Author's Affiliation | Faculty of Engineering, SHINSHU UNIVERSITY() |
| 2nd Author's Name | Kenji FURIHATA |
| 2nd Author's Affiliation | Faculty of Engineering, SHINSHU UNIVERSITY |
| 3rd Author's Name | Tsuyoshi TADA |
| 3rd Author's Affiliation | Faculty of Medicine, SHINSHU UNIVERSITY |
| 4th Author's Name | Jun NAKANO |
| 4th Author's Affiliation | ICHIKAWA CO. LTD. |
| 5th Author's Name | Satoshi YASUMOTO |
| 5th Author's Affiliation | ICHIKAWA CO. LTD. |
| 6th Author's Name | Norio KOIKE |
| 6th Author's Affiliation | ICHIKAWA CO. LTD. |
| Date | 2012-10-27 |
| Paper # | EA2012-70 |
| Volume (vol) | vol.112 |
| Number (no) | 266 |
| Page | pp.pp.- |
| #Pages | 6 |
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