He has been studying ultrasonic metrology, especially acoustic microscopy and its applications, and established a method of material characterization by line-focus-beam acoustic microscopy. He also has been interested in biological tissue characterization in the higher frequency range, applying both bulk and acoustic microscopy techniques.,Dr. Kushibiki is a Fellow of the Acoustical Society of America; a Member of the Institute of Electronics, Information and Communication Engineers of Japan, of the Institute of Electrical Engineers of Japan, of the Acoustical Society of Japan, of the Japan Society of Ultrasonics in Medicine, and of the Japan Society of Applied Physics.