DocumentCode :
1241529
Title :
Multifrequency transducer for microemboli classification and sizing
Author :
Palanchon, Peggy ; Bouakaz, Ayache ; Klein, Jan ; De Jong, Nico
Author_Institution :
Dept. of Cardiology, Erasmus Med. Center Rotterdam, Netherlands
Volume :
52
Issue :
12
fYear :
2005
Firstpage :
2087
Lastpage :
2092
Abstract :
The classification of circulating microemboli as gaseous or particulate matter is essential to establish the relevance of the detected embolic signals. Until now, Doppler techniques have failed to determine unambiguously the nature of circulating microemboli. Recently, a new approach based on the analysis of radio frequency (RF) signal and using the nonlinear characteristics of gaseous bubbles to classify emboli was investigated. The main limitation of these studies was the requirement of two separate transducers for transmission and reception. This paper presents a multi-frequency transducer with two independent transmitting elements and a separate receiving part with a wide frequency band. The transmitting elements are positioned in a concentric design and cover a frequency band between 100 and 600 kHz. The receiving part consists of a polyvinylidene fluoride layer. The new transducer has been tested in vitro using gaseous emboli. It could correctly classify and size air emboli with diameters ranging from 10 μm to 105 μm.
Keywords :
biomedical transducers; biomedical ultrasonics; microwave devices; 10 to 105 mum; 100 kHz; 600 kHz; gaseous bubbles; independent transmitting elements; microemboli classification; microemboli sizing; multifrequency transducer; polyvinylidene fluoride layer; radio frequency signal; Associate members; Cardiology; Helium; In vitro; RF signals; Radio frequency; Signal analysis; Signal detection; Testing; Transducers; Harmonic-subharmonic-emboli-characterization; Electromagnetics; Embolism, Air; Equipment Design; Equipment Failure Analysis; Gases; Microspheres; Particle Size; Radio Waves; Transducers;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.2005.857641
Filename :
1542459
Link To Document :
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