A method for controlling an ultrasound system which includes an ultrasound probe and an image display device wirelessly connected to each other and in which the image display device is configured to display a compound image based on a plurality of frame image information data items generated by the ultrasound probe, where the frame image information data is a signal obtained by performing attenuation correction according to a depth of a reflection position of the ultrasonic waves and an envelope detection process on a sound ray signal, or an ultrasound image signal obtained by performing attenuation correction according to a depth of a reflection position of the ultrasonic waves and an envelope detection process on the sound ray signal and converting the sound ray signal according to a predetermined image display method, the method comprising:
- performing transmission and reception of ultrasonic waves based on a transmission and reception sequence using a transducer array of the ultrasound probe to generate the sound ray signal;
- generating the plurality of frame image information data items based on the generated sound ray signal;
- sequentially wirelessly transmitting the plurality of generated frame image information data items from the ultrasound probe to the image display device;
- determining a steering angle range of each of the plurality of frame image information data items wirelessly transmitted from the ultrasound probe in the image display device;
- determining to combine the plurality of frame image information data items corresponding to a plurality of images having different steering angle ranges, in a case where frame image information data items corresponding to all of the steering angles needed to compose one compound image data are received from the ultrasound probe;
- determining not to combine the plurality of frame image information data items, in a case where only a part of the frame image information data items corresponding to all of the steering angles needed to compose the one compound image data are received from the ultrasound probe;
- once the plurality of frame image information data items are determined to be combined,
- combining the plurality of frame image information data items corresponding to the plurality of images having different steering angle ranges to generate the compound image data;
- and
- displaying on a monitor the compound image based on the compound image data;
- and
- once the plurality of frame image information data items are determined not to be combined,
- stopping combining the plurality of frame image information data items;
- and
- continuing to display on the monitor the latest compound image which has already been generated and displayed on the monitor.