MURAGAKI Yoshihiro    Department   School of Medicine(Tokyo Women's Medical University Hospital), School of Medicine    Position   Visiting Professor
Language	Japanese
Title	The correction method of anatomical deformation considered perioperative body position for chest navigation system
Conference Type	Nationwide Conferences
Presentation Type	Speech
Date	2008/10/31
Society abstract	日本コンピュータ外科学会誌 10(3),395-396 2008
Summary	Abstract: The navigation system for thoracoabdominal aortic replacement has been originally developed based on an experience of neurosurgery, and this approach has been applied clinically since 2006. However, in the current navigation system, there was a problem that patient's postures are different between preoperative CT scanned data and intraoperative real data. In this paper, it is aimed to improve current navigation system to follow global deformation arising from difference of patient's postures. And the mathematical method is discussed that matches image space with real space globally by correcting the image. In thispaper, mathematical method to accord graphic space with real space globally is discussed It is assumed that the deformation of thoracic cage is affected by the weight of trunk. To match both spaces, the algorithm that makes image slanted at the thoracic region was developed. The angle of inclination for slanting and were calculated from body weight, width of costale and elastic coefficient of bone. This algorithm was evaluated by using MRI images of two volunteers those were scanned in dorsal position and right decubitus position. As a result, fitting between image space and real space decreased by 20% by operating this algorithm. It is concluded that this algorithm is effective to match both spaces.