| 摘要 |
PURPOSE: A system is provided to accumulate ultrasound information from a region of interest during a post-storage mode for variable ultrasound analyses. CONSTITUTION: Ultrasound echo signal data in a system for providing variable ultrasound analyses in a post-storage mode comprises a complete set of raw RF signal samples( or the quadrature signals I and Q) are accumulated in a cinescan memory during a storage period for multiple range positions along one or more scan lines covering a region of interest. Line interleaving and multiline acquisition techniques may be employed in data accumulation. The accumulated echo signal data is processed during a post-storage operation to provide a number of various and selectable analysis and display modes. During the post-storage playback operation, any known signal processing and data manipulation techniques, which have conventionally been carried out in real-time during a scanning may be selectively modified during post-storage playback to optimize the displayed output. For example, in an off-line playback mode, the system operator may select any scan line and Doppler gate location and width within the region of interest for spectral Doppler analysis or for color M-mode analysis. The system operator may also manually set and reset one or more beam/vessel angles such as spectrum scale, Doppler dynamic range, Doppler gain, baseline and color mapping may also be modified during off-line playback. Other known signal processing operations such as noise parameters thereof adjusted, during the post-storage operation.
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