Kabushiki Kaisha Toshiba

Yukinobu Yokoyama

Ryoichi Kanda

A region of interest of a subject is scanned with ultrasound to acquire echo signals. The echo signals are processed to obtain doppler signals. The doppler signals are processed to obtain color angio signals reflecting an amplitude of the doppler signals. The maximum value of levels of the color angio signals is increased from a first value to a second value by a contrast-enhancement effect. The level change within the first value is expressed by the brightness gradation. The level change the first value is expressed by the hue gradation. Therefore, the range less than the first value can be associated with the whole width of the usable brightness gradation of a color display, so that the level change less than the first value can be expressed with high contrast.

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Otawara, Japan

Yukinobu Yokoyama