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Head Neck ; 30(2): 215-21, 2008 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-17764089


BACKGROUND: To date, few imaging methods have been established for the head and neck region, in particular for soft tissues, that allow adequate visualization and simultaneously adequate real-time orientation. METHODS: We report a new method using a navigated ultrasound device and a navigated surgical instrument that allows--even in the absence of bony landmarks--appropriate visualization and reliable orientation in real time. RESULTS: The practical applicability of the system was tested. Good handling and acceptance of the system could be shown. The "3-dimensional error" derived from the deviations in all 3 dimensions lies at 0.64 mm. CONCLUSIONS: With this ultrasound-guided navigated procedure, an accurate approach of soft tissue structures with a surgical instrument is possible. Changes of the situs are represented in real time.

Neoplasias de Cabeça e Pescoço/diagnóstico por imagem , Monitorização Intraoperatória/métodos , Ultrassonografia Doppler/instrumentação , Calibragem , Humanos , Ultrassonografia Doppler/métodos
Acta Bioeng Biomech ; 10(4): 55-62, 2008.
Artigo em Inglês | MEDLINE | ID: mdl-19385513


Navigation systems track objects with precision expressed as root mean square equalling even up to 0.15 mm. Application of navigation system combined with imaging technique makes surgical operations less invasive, which results in the reduced risk of infection, smaller scar and a shorter time of rehabilitation. Imaging techniques allow surgeon to create individual virtual models for virtual surgery planning. Navigation system tracks the positions of surgical tools in relation to the patient's coordinate systems. Medical imaging enables low-invasive surgery, whereas the position of surgical instruments is monitored on screen. The paper presents a newly developed computer-aided surgical system consisting of ultrasonographic probe and tracking system to measure bone geometry, design surgical scenario virtually and follow it intraoperatively. The system assists surgeon to correct bone deformities. The paper presents the results of several accuracy tests, which demonstrate good repeatability and accuracy.

Simulação por Computador , Ortopedia/métodos , Software , Cirurgia Assistida por Computador/métodos , Fêmur/cirurgia , Humanos
Orthopedics ; 30(10 Suppl): S144-7, 2007 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-17983118


In this study, we present a new 2.5-dimensional ultrasonic navigation system for measuring axes, lengths, and torsions preoperatively, intraoperatively, and postoperatively. The system comprises an ultrasound unit with a 5-MHz linear probe (TELEMED Echoblaster 128; Telemed, Vilnius, Lithuania) and a navigation system (OrthoPilot; B. Braun Aesculap, Tuttlingen, Germany) with a Polaris camera (Northern Digital, Waterloo, Canada). Specialized software developed for this application allows for selecting any body region on a virtual 3D skeleton. With a virtual ultrasound probe, planes needed for measurements can be defined. For each section, the respective surface contour of the bone, which is also shown in the ultrasound image, is displayed. Alternatively, the clinician can use established standard sections. Finally, the required length, axes, and torsions are defined. The accuracy and precision of the system were tested using a plastic model. The measurements of length, torsion, and axis values were accurate to -0.1 +/- 0.3 mm (95% CI), 0.1 degree +/- 0.2 degree (95% CI), and 0.0 degree +/- 0.006 degree (95% CI), respectively. The precision variances for length, torsion, and axis were 1.17 mm (standard deviation) and 0.94 degree and 0.66 degree. These results suggest that the new sonographic method is more accurate than conventional radiographic techniques.

Artroplastia de Quadril/métodos , Osteoartrite do Quadril/diagnóstico por imagem , Cirurgia Assistida por Computador/métodos , Ultrassonografia/instrumentação , Desenho de Equipamento , Humanos , Processamento de Imagem Assistida por Computador/instrumentação , Osteoartrite do Quadril/cirurgia , Reprodutibilidade dos Testes