Ultrasound diagnostic apparatus for reducing influences of structure and speckle in subject

An ultrasound diagnostic apparatus comprising:

• a hardware processor configured to:
• analyze frame data for evaluation range decision formed based on reception beam data for the evaluation range decision, to decide an evaluation range excluding at least a part of a structure in the subject in a data space of the frame data, wherein the reception beam data is formed by reception beam forming with respect to a reception signal obtained by transmitting and receiving ultrasound waves to and from a subject, and the evaluation range decision decides whether each region in the data space of the frame data is included in the evaluation range or excluded from the evaluation range;
• estimate an attenuation amount of the ultrasound waves based on first target beam data that are reception beam data following the reception beam data for the evaluation range decision in time series, wherein the attenuation amount of the ultrasound waves is estimated based only on a frequency spectrum of second target beam data of each region included in the evaluation range among a plurality of regions arranged in a depth direction of the subject defined in advance in a data space of the reception beam data, wherein the second target beam data of each region is a part of the first target beam data;
• execute an envelope detection processing on the first target beam data to generate third target beam data;
• and
• form an ultrasound image based on the third target beam data, and execute a brightness correction processing based on the attenuation amount of the ultrasound waves, to compensate for brightness of each pixel of the ultrasound image which is decreased due to attenuation of the ultrasound waves.