| 摘要 |
PURPOSE:To accurately display the ultrasonic image within a region of concern with uniform resolving power and to reduce the lowering of a frame rate by selecting delay data on the basis of an indicated region and the number of focus points and setting the transmission caliber control data of a probe and controlling a transmission circuit on the basis of both data. CONSTITUTION:An F-number capable of realizing uniform resolving power and the max. focus is calculated on the basis of the number of focus stages and the size of a region of concern and converted to caliber element number data on the basis of the element pitch data of a fine vibrator 2. Next, the delay data at the position of a focus point performing transmission is read from a ROM 7 to be inputted to a transmission delay control circuit 6 along with the calculated caliber element number data. The transmission delay control circuit 6 outputs a trigger signal to a transmission pulser 4 on the basis of the delay data and caliber element number data from a CPU 8. The transmission pulser 4 outputs an ultrasonic pulse on the basis of the trigger signal to perform the transmission driving of the fine vibrator 2. |
