DocumentCode :
3692107
Title :
B-field energy dependent phase lag dispersion in magnetomotive ultrasound imaging
Author :
Roger Andersson;Magnus Cinthio;Maria Evertsson;Hanna Toftevall;Anders Wahlström;Sarah Fredriksson;Göran Nybom;Tomas Jansson
Author_Institution :
Biomedical Engineering, Lund University, Sweden
fYear :
2015
Firstpage :
1
Lastpage :
4
Abstract :
Magnetomotive ultrasound imaging is an emerging technique where superparamagnetic iron oxide nanoparticles can be used as an ultrasound contrast agent. A time-varying external magnetic field acts to move tissue embedded particles, and ultrasound is used to detect the resulting tissue movement. In experimental phantom studies we have observed a phase lag dispersion in the magnetomotive response in respect to applied time-varying magnetic field (B-field). We hypothesize that this dispersion is triggered by the strength of the applied B-field in combination with concentration of embedded nanoparticles in the region. The cohort response of the nanoparticles aligns as the magnetic field gets more energetic. Moreover, the tightening of the phase response indicate an asymptotic tapering towards a phase limit.
Keywords :
"Nanoparticles","Magnetic resonance imaging","Magnetic fields","Ultrasonic imaging","Phantoms","Magnetic flux","Iron"
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium (IUS), 2015 IEEE International
Type :
conf
DOI :
10.1109/ULTSYM.2015.0322
Filename :
7329095
Link To Document :
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