title: Characterization of the shock pulse-induced cavitation bubble activities recorded by an optical fiber hydrophone.
abstract: A shock pressure pulse used in an extracorporeal shock wave treatment has a large negative pressure (<-5 MPa) which can produce cavitation. Cavitation cannot be measured easily, but may have known therapeutic effects. This study considers the signal recorded for several hundred microseconds using an optical hydrophone submerged in water at the focus of shock pressure field. The signal is characterized by shock pulse followed by a long tail after several microseconds; this signal is regarded as a cavitation-related signal (CRS). An experimental investigation of the CRS was conducted in the shock pressure field produced in water using an optical hydrophone (FOPH2000, RP Acoustics, Germany). The CRS was found to contain characteristic information about the shock pulse-induced cavitation. The first and second collapse times (t1 and t2) were identified in the CRS. The collapse time delay (tc = t2 - t1) increased with the driving shock pressures. The signal amplitude integrated for time from t1 to t2 was highly correlated with tc (adjusted R(2) = 0.990). This finding suggests that a single optical hydrophone can be used to measure shock pulse and to characterize shock pulse-induced cavitation.
authors.affiliation: Interdisciplinary Postgraduate Program in Biomedical Engineering, Jeju National University, 102 Jejudaehakno, Jeju-Si, Jeju Special Self-Governing Province, 690-756, Republic of Korea.
authors.forename: Gwansuk
authors.initials: G
authors.lastname: Kang
authors.affiliation: KORUST Limited, B-#716,717, Keumkang Penterium IT Tower, 282 Hagui-Ro, Dongan-Gu, Anyang-Si, Gyeonggi-Do, 431-810, Republic of Korea.
authors.forename: Sung Chan
authors.initials: SC
authors.lastname: Cho
authors.affiliation: Medical Physics Department, Guy's and St. Thomas' National Health Service Foundation Trust, Lambeth Palace Road, London, SE1 7EH, United Kingdom.
authors.forename: Andrew John
authors.initials: AJ
authors.lastname: Coleman
authors.affiliation: Department of Medicine, Jeju National University, 102 Jejudaehakno, Jeju-Si, Jeju Special Self-Governing Province, 690-756, Republic of Korea.
authors.forename: Min Joo
authors.initials: MJ
authors.lastname: Choi
mesh_terms: D004867:Equipment Design; D019220:High-Energy Shock Waves; D008096:Lithotripsy; D008962:Models, Theoretical; D009038:Motion; D055100:Optical Fibers; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D013997:Time Factors; D014160:Transducers, Pressure; D014465:Ultrasonics / Q000295:instrumentation*; D014867:Water
chemical_list: D014867:Water