BACKGROUND: Vibro-acoustography (VA) uses two co-focused ultrasound beams with slightly different frequencies. The beams interact and generate a low-frequency focus to excite an object. METHODS: A two-element confocal ultrasound transducer with central frequency at 3.2 MHz was used to generate the low-frequency excitation (30 kHz) and the response of the bone to that excitation was acquired by a dedicated hydrophone. The face of the confocal transducer was positioned parallel to the surface of the bone at a focal length of 7 cm. The hydrophone was fixed to the side of the transducer, out of the path of the ultrasonic beam. RESULTS: The resulting image clearly showed the bone fracture with resolution of 0.25 mm and high contrast with well-defined borders. CONCLUSIONS: In this paper, we present preliminary results of VA imaging of bone surface and of bone fracture using an experimental set-up. Our results encourage future studies using VA to evaluate bone fractures.
BACKGROUND: Vibro-acoustography (VA) uses two co-focused ultrasound beams with slightly different frequencies. The beams interact and generate a low-frequency focus to excite an object. METHODS: A two-element confocal ultrasound transducer with central frequency at 3.2 MHz was used to generate the low-frequency excitation (30 kHz) and the response of the bone to that excitation was acquired by a dedicated hydrophone. The face of the confocal transducer was positioned parallel to the surface of the bone at a focal length of 7 cm. The hydrophone was fixed to the side of the transducer, out of the path of the ultrasonic beam. RESULTS: The resulting image clearly showed the bone fracture with resolution of 0.25 mm and high contrast with well-defined borders. CONCLUSIONS: In this paper, we present preliminary results of VA imaging of bone surface and of bone fracture using an experimental set-up. Our results encourage future studies using VA to evaluate bone fractures.
Authors: Paulo Moraes Agnollitto; Guilherme de Araújo Braz; Adriano Levi Spirlandeli; Francisco José Albuquerque de Paula; Antonio Adilton Oliveira Carneiro; Marcello Henrique Nogueira-Barbosa Journal: Quant Imaging Med Surg Date: 2021-02
Authors: Peter A Pellionisz; Nikan K Namiri; Gregory Suematsu; Yong Hu; Ameet Braganza; Khuzaima Rangwalla; Daniel J Denson; Karam Badran; Nathan C Francis; Ashkan Maccabi; George Saddik; Zachary Taylor; Maie A St John; Warren S Grundfest Journal: Yale J Biol Med Date: 2018-09-21