Development of Ultrasound Computed Tomography (USCT) system for US guided stereotactic neurosurgery

概要

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Recently, a, number of studies on the 3-D reconstruction of the ultrasound echography are described and published. 3-D Ultrasound echography, compared with other three dimensional medical images, e. g., MR(magnetic resonance)imaging, computed tomography(CT)and positron emission tomography(PET), is effective as an intraoperative use. However, the reconstruction requires computational power and that makes this study not applied to the sufficient clinical use. The authors developed a compact, mobile and less costly ultrasound computer reconstruction system for stereotactic neurosurgery. The system consists of sector probe(Aloka, 20mm in diameter)actuator for its rotation, ultrasound imaging system and personal computer for reconstruction. The probe is guided through a burr hole and automatically rotates in half circle and images gained among this movement are transferred to the personal computer. Then the computer reconstructs the four transverse images and displays on the extension monitor. With the us age of this system, the operator can obtain an ultrasound image on planes perpendicular to a trajectory; they are effective as an guidance for the surgical operation. Computational time scale is enough short(20 sec.)for the usage during the operation. The most attractive feature is that the cost is lower because the system needs only existing ultrasound imaging system and personal computer.
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