2H-4 In vivo Acoustic Radiation Force Impulse Imaging of the Cardiac Cycle

2006 ◽  
Author(s):  
P. D. Wolf ◽  
G. E. Trahey ◽  
D. M. Dumont ◽  
S. J. Hsu ◽  
R. R. Bouchard
Keyword(s):  
Cardiac Cycle ◽  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Acoustic Radiation Force Impulse

scholarly journals Acoustic Radiation Force Impulse Imaging of Human Prostates: Initial In Vivo Demonstration

2012 ◽  
Vol 38 (1) ◽  
pp. 50-61 ◽  
Author(s):  
Liang Zhai ◽  
Thomas J. Polascik ◽  
Wen-Chi Foo ◽  
Stephen Rosenzweig ◽  
Mark L. Palmeri ◽  
...  
Keyword(s):  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Acoustic Radiation Force Impulse

scholarly journals In Vivo Assessment of Myocardial Stiffness with Acoustic Radiation Force Impulse Imaging

2007 ◽  
Vol 33 (11) ◽  
pp. 1706-1719 ◽  
Author(s):  
Stephen J. Hsu ◽  
Richard R. Bouchard ◽  
Douglas M. Dumont ◽  
Patrick D. Wolf ◽  
Gregg E. Trahey
Keyword(s):  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Acoustic Radiation Force Impulse ◽  
Myocardial Stiffness ◽  
In Vivo Assessment

Acoustic radiation force impulse imaging: in vivo demonstration of clinical feasibility

2002 ◽  
Vol 28 (2) ◽  
pp. 227-235 ◽  
Author(s):  
Kathryn Nightingale ◽  
Mary Scott Soo ◽  
Roger Nightingale ◽  
Gregg Trahey
Keyword(s):  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Acoustic Radiation Force Impulse

Acoustic Radiation Force Impulse Imaging of In Vivo Vastus Medialis Muscle Under Varying Isometric Load

2002 ◽  
Vol 24 (2) ◽  
pp. 100-108 ◽  
Author(s):  
Kathryn Nightingale ◽  
Roger Nightingale ◽  
Deborah Stutz ◽  
Gregg Trahey
Keyword(s):  
Recovery Time ◽  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Acoustic Radiation Force Impulse ◽  
Maximum Displacement ◽  
Transducer Array ◽  
Vastus Medialis Muscle ◽  
Arfi Imaging

Acoustic Radiation Force Impulse (ARFI) imaging is a method for characterizing local variations in tissue mechanical properties. In this method, a single ultrasonic transducer array is used to both apply temporally short localized radiation forces within tissue and to track the resulting displacements through time. Images of tissue displacement immediately after force cessation, maximum tissue displacement, the time it takes for the tissue to reach its maximum displacement, and the recovery time constant of the tissue are generated from the ARFI data sets. The information in each of these images demonstrates good agreement with matched B-mode images. The study presented here was designed to evaluate the relationship between changes in these ARFI parameters with known tissue mechanical properties in vivo. Utilizing a modified Siemens Elegra scanner with a 75L40 transducer array, ARFI images of vastus medialis muscle were generated in three of the authors under four levels of activation (0, 5.7, 14.5, and 23.3 N-m). Four ARFI datasets were acquired for each loading condition. The observed trends were that displacement magnitude, the time it took for the tissue to reach its maximum displacement, and recovery time constant decreased with increasing load (i.e., increasing muscle stiffness). Significant differences were observed between load levels and subjects for all parameters (p<0.01). The results indicate that ARFI imaging may be capable of quantifying tissue stiffness in real-time measurements, although further investigation is required.

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