| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic wave diagnostic apparatus in which noise due to pulses of pulse width control causes no effects on information indicative of the velocity of a moving body within a subject when displaying information indicative of the velocity, and also to provide a method of controlling the apparatus.SOLUTION: If a boundary value of a velocity scale set to display information indicative of the velocity of a moving body on a liquid crystal panel is less than a threshold value Th, the frequency of pulses of pulse width control is set to 20 kHz in such a manner that noise due to the pulses of the pulse width control is not displayed on the liquid crystal panel. If the boundary value of the velocity scale is equal to or greater than the threshold value Th, the frequency of pulses of the pulse width control is set to 200 Hz in such a manner that noise due to the pulses of the pulse width control resides at a position remote from the information indicative of the velocity.SELECTED DRAWING: Figure 4 |
