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100401_research

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Masayuki Tanabe

on 7 October 2013

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Transcript of 100401_research

Ultrasound
k/w : finer US Image
US Motor
Coded Excitation
FM Linear Chirp
The received signal can mix with the transmitted signal.
A limitation of the dynamic range of A/D convertor
Difficult to extract the received signal
Problems of Coded Excitation
Time-bandwidth product(TBP)
B ... transducer's characteristics
T ... can be long
solution
Split and Merge
RESULTS
What's ultrasound?
ulta sound
over 20 kHz
in water : 1500 m/s
in air : apprx. 330 m/s
in water : 0.02 dB/cm/MHz
Sensor and Actuator
higher resolution
higher SNR
low RSLL
Tissue Harmonic Imaging
Problems of THI
Mixture of fundamental and harmonic components
Full transcript