Blood-mimicking fluid for the Doppler test objects of medical diagnostic instruments

We present a blood-mimicking fluid for the Doppler test object of medical diagnostic instruments. Accurate measurement in a flow Doppler test requires a blood-mimicking fluid (BMF) that has the acoustic velocity, density, attenuation coefficient, and viscosity defined in the International Electrotechnical Commission (IEC) standard, and furthermore, they must be stable over time. To formulate a fluid with the desired density and acoustic velocity, we have developed a new fluid made of glycerine and water soluble silicone oil. The BMF is dispersed polystyrene particles as scatters in the new fluid. The density of the liquid can be adjusted to maintain the density of the liquid at the same value as that of the polystyrene particles, thus ensuring neutral buoyancy of the particles. The blood-mimicking fluid was stable overlong term, and the acoustic velocity, density, attenuation coefficient, and viscosity of the fluid meet the specific values.