Automated In Vivo Sub-Hertz Analysis of Viscoelasticity (SAVE) for Evaluation of Breast Lesions
An ultrasound-based imaging method is proposed to visualize viscoelastic properties of the breast masses at sub-Hertz frequencies. The method utilizes an automated compression device with closed-loop feedback control that houses an ultrasound probe. A ramp-and-hold creep test is performed on the tissue while ultrasound is used to image tissue deformation. A classic viscoelastic Kelvin-Voigt model is then used to estimate viscoelasticity parameters….
Unambiguous Identification and Visualization of an Acoustically Active Catheter by Ultrasound Imaging in Real Time: Theory, Algorithm, and Phantom Experiments
To enable better intracardiac guidance and visualization, a prototype of an acoustically active catheter with a piezoelectric element on its distal end is used. The unique symmetric Doppler shifts from the piezoelectric element are detected by the proposed algorithm and the distal end is visualized with a unique color (yellow) in real-time (22- 50 Hz). The algorithm is robust to interference from blood flow with a localization range of few millimeters.
Automated Compression Device for Viscoelasticity Imaging
Non-invasive measurement of tissue viscoelastic properties is gaining more attention for screening and diagnostic purposes. Recently, measuring dynamic response of tissue under a constant force has been studied for estimation of tissue viscoelastic properties in terms of retardation times.