Ultrasound diagnostic apparatus

An ultrasound diagnostic apparatus, comprising:

• an evaluation range decision unit that analyzes reception beam data before detection processing out of reception beam data formed by reception beam forming with respect to a reception signal obtained by transmitting and receiving ultrasound waves to and from a subject, to decide an evaluation range excluding at least a part of a structure of the subject in a data space of the reception beam data;
• an attenuation amount estimation unit that estimates an attenuation amount of the ultrasound waves based on a frequency spectrum of the reception beam data before the detection processing 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 the data space of the reception beam data, without using the reception beam data of the region that is not included in the evaluation range;
• and
• an image formation unit that forms an ultrasound image based on the reception beam data subjected to the detection processing while executing brightness correction processing of correcting, to compensate for brightness of a pixel of the ultrasound image which is decreased due to attenuation of the ultrasound waves, the brightness of each pixel based on the estimated attenuation amount.