The present invention relates to an apparatus, method and system for detecting and locating dental cavitations in jawbones using Through-Transmission Alveolar Ultrasonography (TAU). The apparatus comprises a measuring unit comprising an ultrasonic transducer and a round ultrasonic receiver. The apparatus is a handhold and is configured to define the geometric position of the ultrasonic transducer and the ultrasonic receiver with respect to each other so as to achieve a high-resolution ultrasound image of the jawbone with minimal errors and in order to improve diagnosis of dental cavitations.
