Estimation for SIR of Low-Frequency Imaging Based on Multi-Frequency Approximation
Date Issued
2005
Date
2005
Author(s)
Lin, Chih-Wei
DOI
zh-TW
Abstract
Low-frequency response of microbubbles was found recently, the center frequency of low-frequency response was lower than ones of fundamental and subharmonic response. Based on the low-frequency response, good SIR could be made.
Two-frequency approximation might evaluate the bandwidth of spectrum but could not describe the continuous spectrum of response and the extent of overlap. Hence, the multi-frequency approximation model was developed to evaluate the signal-to-interference ratio and to describe the continuous spectrum of fundamental and low-frequency response.
Computer simulations were performed toinvestigate the spectrum of microbubbles and the bandwidth of signal.
Experiments on phantoms could make imaging by low-frequency response and got a SIR from ROI. SIR almost were worse when bandwidth was larger. Multi-frequency approximation model could provide a new technique to evaluate the filter and the influence of bubble distributions.
Subjects
超音波
微氣泡
影像
模擬
ultrasound
imaging
microbubbles
simulation
Type
thesis
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