Ultrasonic diagnostic apparatus

An ultrasonic diagnostic apparatus, comprising:

• a frequency characteristic analysis circuit configured to perform a frequency analysis on a first reception signal corresponding to a region of interest of each depth, of multiple depths, among reception signals of ultrasonic waves, and acquire a frequency characteristic of each depth;
• a filter setting circuit configured to set a reception filter of each depth based on the acquired frequency characteristic of each depth such that a signal resulting from application of the reception filter has a predetermined frequency characteristic;
• a filter processing circuit configured to apply the set reception filter of each depth to a second reception signal corresponding to the region of interest of each depth among the reception signals, the second reception signal being after the first reception signal, and convert the second reception signal into a third reception signal corresponding to the region of interest of each depth among the reception signals;
• and
• an image generating circuit configured to generate an ultrasonic image based on the converted third reception signal corresponding to the region of interest of each depth of the multiple depths, wherein
• the frequency characteristic analysis circuit is further configured to
• set, prior to the frequency analysis of the reception signals in the region of interest of each depth being performed, the region of interest within an imaging region of the ultrasonic image to include a center of the imaging region in a scanning direction,
• determine that a change in a value indicating a scan section is equal to or greater than a first threshold value, the scan section being a cross-section in which the ultrasonic waves are transmitted and received,
• after the determination, determine that the change in the value indicating the scan section is less than a second threshold value, and
• perform the frequency analysis on a fourth reception signal corresponding to the region of interest of each depth, the fourth reception signal being received after the first reception signal.

An ultrasonic diagnostic apparatus, comprising:

• a frequency characteristic analysis circuit configured to perform a frequency analysis on a first reception signal corresponding to a region of interest of each depth, of multiple depths, among reception signals of ultrasonic waves, and acquire a frequency characteristic of each depth;
• a filter setting circuit configured to set a reception filter of each depth based on the acquired frequency characteristic of each depth such that a signal of each depth resulting from application of the reception filter has a predetermined frequency characteristic;
• a filter processing circuit configured to apply the set reception filter of each depth to a second reception signal corresponding to the region of interest of each depth among the reception signals, the second reception signal being after the first reception signal, and convert the second reception signal into a third reception signal corresponding to the region of interest of each depth among the reception signals;
• and
• an image generating circuit configured to generate an ultrasonic image based on the converted third reception signal corresponding to the region of interest of each depth of the multiple depths, wherein
• the frequency characteristic analysis circuit is further configured to
• set, prior to the frequency analysis of the reception signals in the region of interest of each depth being performed, the region of interest within an imaging region of the ultrasonic image to include a center of the imaging region in a scanning direction,
• determine that change in a value indicating a condition of a depth of field is equal to or greater than a threshold value, and
• perform the frequency analysis on a fourth reception signal corresponding to the region of interest of each depth, the fourth reception signal being received after the first reception signal.