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Proceedings Paper

Registration of preoperative CTA and intraoperative fluoroscopic image sequence for assisting endovascular stent grafting
Author(s): Hiroshi Imamura; Naozo Sugimoto; Shigeru Eiho; Shin-ichi Urayama; Katsuya Ueno; Kanji Inoue
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Paper Abstract

We have investigated a registration method between pre-operative 3D CT angiography (3D-CTA) and intra-operative fluoroscopic image sequence (with/without contrast injection) during intervention. Most registration methods are developed for assisting neurosurgery or orthopedic surgery, but our method is developed for interventional procedure such as endovascular stent grafting. In our method, DRR (Digitally Reconstructed Radiograph) are generated by voxel projection of 3D-CTA after extracting an aorta region. By increasing/decreasing CT value in the aorta region of CTA, DRR with/without contrast media injection are obtained. Subsequently we calculate distance (or similarity) measures between DRR and fluoroscopic image iteratively by changing imaging parameters. The most similar DRR to fluoroscopy is selected. We validated our algorithm by using simulated/clinical fluoroscopic images and DRR (with/without contrast media injection) of thorax and abdomen. Several distance (or similarity) measures were investigated in this experiment. Validation results show that M-estimator of residual is good as matching measure, and registration is well performed for almost all cases. However, accuracy is not enough for non-contrasted thoracic images, and calculation time should be reduced for all cases.

Paper Details

Date Published: 17 May 2002
PDF: 10 pages
Proc. SPIE 4681, Medical Imaging 2002: Visualization, Image-Guided Procedures, and Display, (17 May 2002); doi: 10.1117/12.466953
Show Author Affiliations
Hiroshi Imamura, Kyoto Univ. (Japan)
Naozo Sugimoto, Kyoto Univ. (Japan)
Shigeru Eiho, Kyoto Univ. (Japan)
Shin-ichi Urayama, National Cardiovascular Ctr. Research Institute (Japan)
Katsuya Ueno, Takeda Hospital (Japan)
Kanji Inoue, Takeda Hospital (Japan)

Published in SPIE Proceedings Vol. 4681:
Medical Imaging 2002: Visualization, Image-Guided Procedures, and Display
Seong Ki Mun, Editor(s)

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