To provide a highly accurate display of blood flow information and elastic modulus by preventing a measurement error caused by reflection from a depth part by a previous transmission in an ultrasonograph.
An error between a measured amount and an actual moving distance in a turnback phenomenon when a blood flow rate is high and a moving distance measurement when a deformation is large is solved by shortening a repetition interval of transmission/receiving. Mixing of reflected signals in the depth part of the previous transmission pulse can be prevented by positioning a transmission opening and a receiving opening in different positions to provide a favorable signal even if increasing the repetition frequency.
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Hiroki Naito
Daisuke Nagano