ULTRASONOGRAPH

PROBLEM TO BE SOLVED: To provide an ultrasonograph which can easily set a region of interest for Doppler images to be produced on a tomogram displayed on an image display of the device, and can prevent the decline of the PRF(Pulse Repeating Frequency) of ultrasonic beams. SOLUTION: An outer input device 5 is to input instructions for operation from outside to a DSC part 3 and set a position marker on the image displayed on an image display 4. And a detection part 11 for the operation of the outer input device is to input a position marker setting signal from the outer input device 5 and output an operation detection signal S from the outer input device 5. When a region of interest for Doppler images to be produced on a tomogram displayed on the image display 4 is set, a tomogram generation sequence part 6 and a Doppler image occurrence sequence part 7 inside the DSC part 3 are switched with each other by the operation detection signal S from the detection part 11 for the operation of the outer input device. Therefore, it becomes easier to set the region of interest for Doppler images to be produced on a tomogram displayed on the image display 4, and the decline of the PRF of ultrasonic beams can be prevented.