Title | An active dynamic vibration absorber for a hand-held vibro-elastography probe |
Publication Type | Journal Article |
Year of Publication | 2007 |
Authors | Rivaz, H., and R. Rohling |
Journal | Journal of Vibration and Acoustics-Transactions of the ASME |
Volume | 129 |
Pagination | 101–112 |
ISSN | 1048-9002 |
Abstract | Vibro-elastography is a new medical imaging method that identifies the mechanical properties of tissue by measuring tissue motion in response to a multi-frequency external vibration source. Previous research on vibro-elastography used ultrasound to measure the tissue motion and system identification techniques to identify the tissue properties. This paper describes a hand-held probe with a combined vibration source and ultrasound transducer to implement the new method as a practical device. The device uses a proportional integral active dynamic vibration absorber with an electromagnetic actuator to counterbalance the reaction forces from contact with the tissue. Experiments show an operational frequency range of 5-20 Hz, with at least 15 dB vibration absorption in 0.4 s for single frequency excitation. Experiments with variable frequency and amplitude excitation also show a high level of vibration absorption. |
URL | http://dx.doi.org/10.1115/1.2424982 |
DOI | 10.1115/1.2424982 |