Object information acquiring apparatus and control method thereof

A control method of an object information acquiring apparatus that includes:

• a holding unit configured to hold an object;
• a probe configured to receive, via the holding unit, an acoustic wave that propagates from the object held by the holding unit;
• a housing configured to, along with the holding unit, constitute a holding container;
• a matching solution configured to be filled inside the holding container and to match acoustic impedance between the holding unit and the probe;
• and a pressure adjustment unit including a liquid quantity adjustment section configured to adjust a quantity of the matching solution inside the holding container, and a distance adjustment section configured to adjust a distance between the holding container and the object, the control method comprising the steps of:
• causing the pressure adjustment unit to perform a first compression which increases a pressure applied to the object to a predetermined pressure value while adjusting the distance adjustment section without adjusting the liquid quantity adjustment section;
• and
• causing the pressure adjustment unit to perform a second compression which maintains the predetermined pressure value by decreasing the distance between the object and the holding container using the distance adjustment section, while decreasing the liquid quantity inside the holding container using the liquid quantity adjustment section.