Abstract
Currently, a large number of endovascular interventions are performed for treatment of intracranial aneurysms. For these treatments, correct positioning of microcatheter tips, microguide wire tips, or coils is essential. Techniques to detect such devices may facilitate endovascular interventions. In this paper, we describe an algorithm for tracking of microcatheter tips during fluoroscopically guided neuroendovascular interventions. A sequence of fluoroscopic images (1,024 × 1,024 × 12 bits) was acquired using a C-arm angiography system as a microcatheter was passed through a carotid phantom which was on top of a head phantom. The carotid phantom was a silicone cylinder containing a simulated vessel with the shape and curvatures of the internal carotid artery. The head phantom consisted of a human skull and tissue-equivalent material. To detect the microcatheter in a given fluoroscopic frame, a background image consisting of an average of the four previous frames is subtracted from the current frame, the resulting image is filtered using a matched filter, and the position of maximum intensity in the filtered image is taken as the catheter tip position in the current frame. The distance between the tracked position and the correct position (error distance) was measured in each of the fluoroscopic images. The mean and standard deviation of the error distance values were 0.277 mm (1.59 pixels) and 0.26 mm (1.5 pixels), respectively. The error distance was less than 3 pixels in the 93.0% frames. Although the algorithm intermittently failed to correctly detect the catheter, the algorithm recovered the catheter in subsequent frames.
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Acknowledgement
This research supported by a grant-in-aid for young scientists (B) (KAKENHI 15790656) of The Ministry of Education, Culture, Sports, Science and Technology of Japan and NIH Grant numbers R01 HL52567, R01 EB002916, R01 EB002873 and R01 NS43924
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Takemura, A., Hoffmann, K.R., Suzuki, M. et al. An Algorithm for Tracking Microcatheters in Fluoroscopy. J Digit Imaging 21, 99–108 (2008). https://doi.org/10.1007/s10278-007-9016-9
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DOI: https://doi.org/10.1007/s10278-007-9016-9