In this paper, we present a 3-D tracking technique inspired by visual servoing, specifically designed for Computed Tomography (CT). This work has been developed within the framework of robotand computer-assisted interventional radiology, using stereotactic external fiducials made of radiopaque rods. These fiducials produce a set of image feature points that are used in a pose estimation algorit...

In our centre, 111 patients have been treated with linear accelerator stereotactic radiosurgery. Angiographic, CT and MRI images are generated and the target coordinates calculated in 3 dimensions. For CT scanning, cross sections of perpendicular and oblique fiducial markers are seen. For follow-up CT scans done without the frame, a virtual frame is generated by means of a computer program that...

alzheimer’s disease (ad) is a progressive neurodegenerative disorder that affects regions of the brain that control cognition, memory, language, speech and awareness to one’s physical surroundings. the pathological initiation and progression of ad is highly complex and its prevalence is on the rise. in his study, alzheimer's disease was induced with single injection of amyloid-β (aβ) pepti...

The authors compared the accuracy of laser surface scanning patient registration using the commercially available Fazer (Medtronic, Inc.) with the conventional registration procedure based on fiducial markers (FMs) in computer-assisted surgery. Four anatomical head specimens were prepared with 10 titanium microscrews placed at defined locations and scanned with a 16-slice spiral computed tomogr...

Frameless stereotactic techniques used in conjunction with three-dimensional images allow accurate planning and performance of a variety of neurosurgical procedures. The authors have used the frameless stereotactic Allegro Viewing Wand system to provide real-time correlation of the operating field and computerized images in 42 neurosurgical operations, including 31 epilepsy procedures. The syst...

Brain metastases are the most common intracranial tumors, with an incidence of about 150 000 new cases per year in the US. Radiosurgery is increasingly used as the first line treatment of these lesions because it achieves a high local control rate (95%) with relatively little side effects, such as radiation necrosis (5-15%) 2, . Differential diagnosis between tumor relapse and radiation necrosi...

There is a need for frameless guidance systems to help surgeons plan the exact location for incisions, to define the margins of tumors, and to precisely identify locations of neighboring critical structures. The authors have developed an automatic technique for registering clinical data, such as segmented magnetic resonance imaging (MRI) or computed tomography (CT) reconstructions, with any vie...