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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mechanical index ： ウィキペディア英語版 Mechanical index Mechanical index (MI) is an ultrasound metric. It is defined as 〔Thomas Szabo (2004). ''Diagnostic Ultrasound Imaging: Inside Out (Biomedical Engineering)''. ISBN 978-0-12-680145-3〕 :$\backslash text\; =\; \backslash frac\},$ where : *PNP is the peak negative pressure of the ultrasound wave (MPa), derated by 0.3 dB cm−1 MHz−1 to account for the difference between in-water and in-tissue acoustic attenuation, and : *''Fc'' is the center frequency of the ultrasound wave (MHz). Mechanical index can be used as an estimate for the degree of bio-effects a given set of ultrasound parameters will induce. A higher mechanical index means a larger bio-effect. Currently the FDA stipulates that diagnostic ultrasound scanners cannot exceed a mechanical index of 1.9.〔 http://www.accessdata.fda.gov/cdrh_docs/pdf9/K091970.pdf (accessed July 2010)〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mechanical index」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.