J. Hummel, M. Figl, W. Birkfellner, C. Ede, R. Seemann, H. Bergmann
{"title":"Hybrid tracking system for flexible endoscopes","authors":"J. Hummel, M. Figl, W. Birkfellner, C. Ede, R. Seemann, H. Bergmann","doi":"10.1117/12.534002","DOIUrl":"https://doi.org/10.1117/12.534002","url":null,"abstract":"With the miniaturization of electromagnetic tracking systems (EMTS) the range of possible applications in \u0000image guided therapy was extending. A diameter smaller than 1 mm allows for mounting these sensors into \u0000the working channel of flexible endoscopes for navigation within the body. Knowing the exact position of the \u0000instrument with respect to the patient’s position preoperative CT or MR images can simplify and ease navigation \u0000during various interventions. The Aurora EMTS seems to be an ideal choice for this purpose. However, using \u0000this system exhibits an important limitation: the sensor offers just 5 degrees of freedom (DOF) which means that \u0000rotations round the axis of the sensor cannot be measured. To overcome this restriction we used an additional \u0000optical tracking system (OTS) which is calibrated to deliver the missing DOF. \u0000To evaluate the suitability of our new navigation system we measured the Fiducial Registration Error (FRE) \u0000of the diverse registrations and the Target Registration Error (TRE) for the complete transformation from the US \u0000space to the CT space. The FRE for the ultrasound calibration amounted to 3.2 mm±2.2 mm, resulting from \u000010 calibration procedures. For the transformation from the OTS reference system to the EMTS emitter space \u0000we found an average FRE of 0.8 mm±0.2 mm. The FRE for the CT registration was 1.0 mm±0.3 mm. \u0000The TRE was found to be 5.5 mm± 3.2 mm.","PeriodicalId":302939,"journal":{"name":"Medical Imaging: Image-Guided Procedures","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134075324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Front Matter: Volume 7625","authors":"Proceedings of Spie","doi":"10.1117/12.862162","DOIUrl":"https://doi.org/10.1117/12.862162","url":null,"abstract":"This PDF file contains the front matter associated with SPIE Proceedings Volume 7625, including the Title Page, Copyright information, Table of Contents, and the Conference Committee listing.","PeriodicalId":302939,"journal":{"name":"Medical Imaging: Image-Guided Procedures","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132526322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Automatic pose initialization for accurate 2D/3D registration applied to abdominal aortic aneurysm endovascular repair","authors":"S. Miao, J. Lucas, Rui Liao","doi":"10.1117/12.911495","DOIUrl":"https://doi.org/10.1117/12.911495","url":null,"abstract":"Minimally invasive abdominal aortic aneurysm (AAA) stenting can be greatly facilitated by overlaying the preoperative 3-D model of the abdominal aorta onto the intra-operative 2-D X-ray images. Accurate 2-D/3-D registration in 3-D space makes the 2-D/3-D overlay robust to the change of C-Arm angulations. By far, the 2-D/3-D registration methods based on simulated X-ray projection images using multiple image planes have been shown to be able to provide satisfactory 3-D registration accuracy. However, one drawback of the intensity-based 2-D/3-D registration methods is that the similarity measure is usually highly non-convex and hence the optimizer can easily be trapped into local minima. User interaction therefore is often needed in the initialization of the position of the 3-D model in order to get a successful 2-D/3-D registration. In this paper, a novel 3-D pose initialization technique is proposed, as an extension of our previously proposed bi-plane 2-D/3-D registration method for AAA intervention [4]. The proposed method detects vessel bifurcation points and spine centerline in both 2-D and 3-D images, and utilizes landmark information to bring the 3-D volume into a 15mm capture range. The proposed landmark detection method was validated on real dataset, and is shown to be able to provide a good initialization for 2-D/3-D registration in [4], thus making the workflow fully automatic.","PeriodicalId":302939,"journal":{"name":"Medical Imaging: Image-Guided Procedures","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123554340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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