Ultrasound diagnostic apparatus and control method of ultrasound diagnostic apparatus

An ultrasound diagnostic apparatus that assists in puncturing a blood vessel of a subject, the ultrasound diagnostic apparatus comprising:

• a monitor;
• an ultrasound probe;
• a processor configured to
• continuously acquire an ultrasound image of the blood vessel using the ultrasound probe,
• detect the blood vessel from the ultrasound image,
• acquire a depth of a center and a thickness of the blood vessel as blood vessel information of the blood vessel which is detected,
• acquire needle information of a puncture needle,
• accept a designation of an insertion position of the puncture needle by a user,
• set a lower limit value A1 and an upper limit value A2 of a needle insertion angle range based on the depth of the center of the blood vessel and an insertable length of the puncture needle into the subject,
• calculate a distance L2 from the insertion position of the puncture needle through D/[tan(A1)] using the lower limit value A1 and depth D of the center of the blood vessel,
• calculate a distance L3 from the insertion position of the puncture needle through D/[tan(A2)] using the upper limit value A2 and the depth D of the center of the blood vessel,
• calculate a range in which the puncture needle is inserted within the blood vessel having a thickness equal to or greater than a predetermined thickness, within a range between a position separated by the distance L2 and a position separated by the distance L3 from the insertion position of the puncture needle, as a range of an estimated reaching position of the puncture needle, and
• display a range of the estimated reaching position on the monitor as a range of positions which are on a center line along a running direction of the blood vessel and at which the puncture needle can reach, with the estimated reaching position being superimposed on the ultrasound image.