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High-sensitive ultrasound imaging of small vessels Kenji Yoshida Ultrasound imaging for visualizing small vessels with diameter from several ten to several hundred micrometers have been studied. We proposed contrast enhanced active Doppler ultrasound imaging (CEADUS), where the motions of contrast agents caused by acoustic radiation force of incident ultrasound are visualized. In conventional method, the image has only the information on echo intensity. On the other hand, CEADUS utilize the phase of echo signal to improve image quality. Based on phantom experiments, we demonstrated that CEADUS enabled to visualize a simulated channel with high sensitivity. Now we are improving shortcomings of CEADUS such as poor frame rate and motion artifact to develop to effective method.