Ultrasonic Non-Linear Imaging
Date Issued
1999-07-31
Date
1999-07-31
Author(s)
DOI
882314B002216M08
Abstract
Generation of the second harmonic
signal was studied for finite amplitude
distortion based second harmonic imaging.
Acoustic field amplitudes of a fixed focus
transducer along the range axis were
measured using a PVDF needle hydrophone.
Results indicated that on-axis amplitudes
strongly depended on the f-number at both
the fundamental and the second harmonic
frequencies. A two-focus transducer was also
used. Gray scale imaging, hydrophone
measurement and simulations were
performed. Results of the study using the
two-focus transducers can be generalized to
imaging systems with full dynamic transmit
focusing capabilities. It is expected that
dynamic transmit focusing can improve the
SNR of finite amplitude distortion based
second harmonic imaging while improving
the contrast resolution over fundamental
imaging.
signal was studied for finite amplitude
distortion based second harmonic imaging.
Acoustic field amplitudes of a fixed focus
transducer along the range axis were
measured using a PVDF needle hydrophone.
Results indicated that on-axis amplitudes
strongly depended on the f-number at both
the fundamental and the second harmonic
frequencies. A two-focus transducer was also
used. Gray scale imaging, hydrophone
measurement and simulations were
performed. Results of the study using the
two-focus transducers can be generalized to
imaging systems with full dynamic transmit
focusing capabilities. It is expected that
dynamic transmit focusing can improve the
SNR of finite amplitude distortion based
second harmonic imaging while improving
the contrast resolution over fundamental
imaging.
Subjects
Ultrasound
Nonlinear Imaging
Multiple Zone Focusing
Publisher
臺北市:國立臺灣大學電機工程學系暨研究所
Type
report
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