Disclose the medical imaging apparatus (10) for checking a capacity of a main body (12). Medical imaging apparatus includes a ultrasound acquisition unit (14) for a ultrasonic probe of the acquiring ultrasound image data for main body, one graphic interface (20), its medical image data for being used to receive main body, a position measuring device (30) for the position for determining ultrasonic probe. One calibration unit is provided for being aligned the ultrasound image data of the anatomical features (32) based on main body and the position of medical image data and ultrasonic probe detected and the alignment for adapting to ultrasound image data and medical image data based on a motion model. One image process unit (18) is provided for processing ultrasound image data and medical image data to merge the ultrasound image data and medical image data based on the alignment to combined image data.
