| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonograph which can make 4 point interpolation operation and can indicate a blood speed correctly even with speed aliasing when a colored image of blood flow is displayed. SOLUTION: A 4 point code judging means 19 and a threshold processing means 20 are installed before a 4 point interpolation operation means 15 inside a color blood flow image display of this device. The 4 point code judging means 19 is to judge whether codes at 4 points surrounding a point to be examined are the same or not, and the threshold processing means 20 is to judge whether the absolute value of the speed at the 4 points is above the threshold previously set for judging the speed aliasing, and to conduct the speed processing against the speed aliasing even if the absolute value is above the threshold only by one point. And a code inversion processing means 21 is installed after the 4 points interpolation operation means 15. The code inversion processing means 21 is to conduct the code inversion processing when the absolute value of the result of the 4 point interpolation operation is above the critical speed for detection. Using such means, the 4 points interpolation operation can be made correctly and a correct blood flow speed can be indicated even when there is a speed aliasing in displaying colored blood flow images. |
