Artikel
Automated registration for image-guided surgery and intraoperative MRI - A phantom study
Automatische Registrierung für Neuronavigation und intraoperatives MRT – eine Phantom-Studie
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Autoren
Veröffentlicht: | 23. April 2004 |
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Gliederung
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Objective
Intraoperative MRI makes updated imaging for surgical navigation possible. A major shortcoming is the necessity to reregister the acquired images to the surgical field. We have designed a system, which uses active markers to achieve this goal without user interaction. In this study we show the feasibility and accuracy of this system.
Methods
An Intera IT 1.5 Tesla System, situated in a surgical suite was used for imaging. The phantom was designed to simulate the location of the head on a movable table. Active markers were attached to the table. These active markers send distinct RF-Impulses, which are unequivocally detected within the imaging volume. The precise location of these markers is read into the navigation system. Thus a Cartesian Coordinate system can be constructed with the active marker information. The navigation system can be used with the newly acquired images without user registration.
Results
The newly acquired images were registered as soon as the navigation system had uploaded the information. There was no user interaction necessary. We have performed accuracy tests with various phantoms, which showed precision of approximately 1-2 mm within the imaging volume according to the image dimensions. When the active markers were located closer to the imaging volume, there was no detectable imprecision.
Conclusions
We have developed and used active markers in combination with a navigation system, to obliviate user interaction for registration. The registration is automated, and occurs during uploading the new images. The surgeon can use the images without delay by ruling out user error, which is the biggest single reason for inaccuracies.