| 摘要 |
A probe 10 transmits an ultrasonic pulse of a wide band, and detects its echo to generate a reception signal. The reception signals are respectively filtered by three filter parts (14a to 14c) of different passing bands. Outputs of the respective filter parts (14a to 14c) are signal components of a narrow band, and speckle components (interference components by a fine structure) appear conspicuously. Outputs of the respective filter parts (14a to 14c) are detected, and the detection outputs are set respectively as each color signal of R, G and B, and are composed by an image composition part (20), whereby a speckle part is displayed by coloring in R, G or B. As a tissue boundary part is high in a signal level in any band, it is displayed in a whitish color by composition.
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