In surgical practice, small metallic instruments are frequently used to perform various tasks inside the human body. We address the problem of their accurate localization in the tissue. Recent experiments using medical ultrasound have shown that this modality is suitable for real-time visualization of anatomical structures as well as the position of surgical instruments. We propose an image-processing algorithm that permits automatic estimation of the position of a line-segment-shaped object. This method was applied to the localization of a thin metallic electrode in biological tissue. We show that the electrode axis can be found through maximizing the parallel integral projection transform that is a form of the Radon transform. To accelerate this step, hierarchical mesh-grid algorithm is implemented. Once the axis position is known, localization of the electrode tip is performed. The method was tested on simulated images, on ultrasound images of a tissue mimicking phantom containing a metallic electrode, and on real ultrasound images from breast biopsy. The results indicate that the algorithm is robust with respect to variations in electrode position and speckle noise. Localization accuracy is of the order of hundreds of micrometers and is comparable to the ultrasound system axial resolution.

• MeSH
• fantomy radiodiagnostické MeSH
• implantace protézy metody   MeSH
• implantované elektrody MeSH
• interpretace obrazu počítačem metody   MeSH
• intervenční ultrasonografie metody   přístrojové vybavení   MeSH
• lidé MeSH
• reprodukovatelnost výsledků MeSH
• senzitivita a specificita MeSH
• vylepšení obrazu metody   MeSH
• zobrazování trojrozměrné metody   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• práce podpořená grantem MeSH

• MeSH
• algoritmy MeSH
• chirurgické nástroje škodlivé účinky   MeSH
• fantomy radiodiagnostické využití   MeSH
• financování organizované MeSH
• implantované elektrody virologie   MeSH
• lidé MeSH
• počítačové zpracování signálu MeSH
• poranění měkkých tkání diagnóza   MeSH
• teoretické modely MeSH
• ultrasonografie metody   využití   MeSH
• zobrazování trojrozměrné MeSH
• Check Tag
• lidé MeSH