Patent ID: 6793626
Filing Date: 2004-09-21
Classification: A61B,G01N,G01S

Abstract:
An ultrasonic scatterer comprising gas-containing particles having an average particle size of 0.01 &mgr;m to 10 &mgr;m, wherein, considering three adjacent particles including a first particle, the nearest particle to the first particle and the second nearest particle to the first particle, 20% to 100% by number of the total gas-containing particles satisfy that the three adjacent particles have a center-to-center distance between the first particle and the nearest particle of 0.01 &mgr;m to 10 &mgr;m, and a center-to-center distance between the first particle and the second nearest particle of 0.01 &mgr;m to 10 &mgr;m,wherein, when diluted with pure water so that the average particle-to-particle distance of the gas-containing particles becomes 1 mm, 10% to 100% by number of the total gas-containing particles satisfy that the three adjacent particles have a center-to-center distance between the first particle and the nearest particle of 0.01 &mgr;m to 10 &mgr;m and a center-to-center distance between the first particle and the second nearest particle of 0.01 &mgr;m to 10 &mgr;m.