Provided are an apparatus and method for imaging a subsurface using frequency-domain reverse-time migration in elastic medium. An object orientation marker, preferably a retro-grate reflector, is placed on an organ of interest of a patient during a scan, such as an MRI scan. Mechanical imaging of the breast is achieved by pressing the sensing pad onto the breast, oscillating it over breast tissue portions with sequential returning to a reference point. A receiver receives light reflected from the reflective marks of the test substrate. The intermediate connector is bilaterally provided with connecting sections that have different orientations.