purpose: to compare central corneal thickness (cct) measured by galilei and orbscan ii with that by ultrasonic (u/s) pachymetry in unoperated eyes. methods: cct was measured in 184 unoperated eyes of 92 healthy retractive surgery candidates using galilei, orbscan ii, and u/s pachymetry. considered as a benchmark, measurements by u/s pachymetry were compared to those obtained by the other two de...

OBJECTIVE To investigate the validity and reliability of computerised acoustic analysis in the detection of abnormal respiratory noises in infants. METHODS Blinded, prospective comparison of acoustic analysis with stethoscope examination. Validity and reliability of acoustic analysis were assessed by calculating the degree of observer agreement using the kappa statistic with 95% confidence in...

In this paper, changes in acoustic characteristic of young children speech are investigated as a function of age. We examined fundamental frequency, formant frequencies and vowel durations of ten monophtongal vowels from American-English speaking children, age groups 3 to 6. In this study, we also examined the vowel pronunciation variability of young-aged children. The results show that prescho...

An efficient finite volume approach has been used to develop a three dimensional Helmholtz acoustic solver for complex geometries. This acoustic solver was utilized to obtain characteristic mode shapes and frequencies of a baffled combustion chamber. An experimental setup, including stationary and moving sensors, has also been used to measure these quantities for the same model combustion chamb...

4.1 Acoustic Microscopy Theory, Techniques, and Specimen Preparation The Physical Interaction between Ultrasound and Solid Media • A Historical Perspective of the Study of Bone with Acoustic Microscopy • Specimen Preparation • The Acoustic Microscope 4.2 Acoustic Studies of Cortical Bone Material Properties Low Frequency • High Frequency 4.3 Acoustic Microscopy and Biomaterials Analysis Acousti...