Imaging of human tooth using ultrasound based chirp-coded nonlinear time reversal acoustics

0359805 - ÚT 2012 RIV NL eng J - Journal Article
Dos Santos, S. - Převorovský, Zdeněk
Imaging of human tooth using ultrasound based chirp-coded nonlinear time reversal acoustics.
Ultrasonics. Roč. 51, č. 6 (2011), s. 667-674. ISSN 0041-624X. E-ISSN 1874-9968
Institutional research plan: CEZ:AV0Z20760514
Keywords : TR-NEWS * chirp-coded excitation * echodentography * ultrasonic imaging
Subject RIV: BI - Acoustics
Impact factor: 1.838, year: 2011
http://www.sciencedirect.com/science/article/pii/S0041624X11000229

The complexity of the tooth internal structure (enamel–dentine interface, cracks between internal tubules) is analyzed by adapting the nonlinear elastic wave spectroscopy (NEWS) with the objective of the tomography of damage. Optimization of excitations is proposed using time reversal (TR) invariance, reciprocity, correlation properties, etc. The TR-NEWS approach is implemented on a third molar human tooth. A 10 MHz bandwidth ultrasonic instrumentation is used, including laser vibrometer and a 20 MHz contact piezoelectric transducer. Nonlinear signature coming from the symmetry properties is experimentally observed in the tooth using bi-modal TR-NEWS imaging after and before focusing induced by the time-compression process. The TR-NEWS polar B-scan of the tooth is described and suggested as a potential application for modern echodentography.
Permanent Link: http://hdl.handle.net/11104/0197517