| Summary: | 碩士 === 國立臺灣大學 === 生醫電子與資訊學研究所 === 101 === The resolution of Ultrasound images is limited by the bandwidth of emitted signal; wider bandwidth is required for images with better resolution. Nowadays, tissue harmonic imaging utilized its broader bandwidth to achieve high-resolution images. However, the number of pulse cycles is reciprocal to the bandwidth of emitted signal but proportional to the production of Tissue Harmonic Signal. In order to break the trade-off between pulse cycles and image resolution, Synthetic Spectrum Imaging (SSI) was presented previously, the principle of which is based on the advantage that narrow band is beneficial to the production of Tissue Harmonic Signal. Under this advantage, the power of THS can be improved and the resolution can be raised to the same level with Pulse Inversion (PI) by increasing the number of synthetic bands. Thus, Synthetic Spectrum technique is capable to acquire high resolution and SNR images. Nevertheless, Synthetic Spectrum imaging has its challenge comes from the absorption effect of tissues, the main reason to reduce the benefits of SSI. Consequently, we presented a correction method to compensate the absorption effect of tissues for maintaining the high SNR and resolution benefits from SSI.
Keywords: Synthetic Spectrum Imaging; tissue harmonic imaging; attenuation correction image; attenuation measurement; Pulse inversion.
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