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Vascular assessment after clipping surgery using four-dimensional CT angiography

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Abstract

Recent advances in computed tomography angiography (CTA) enable repeated imaging follow up for post-clipping surgery. The purpose of this study was to clarify the critical volume and configuration of the aneurysmal clip in the postoperative evaluation using volume rendering (VR) imaging, and present four-dimensional (4D)-CTA for these larger metal artifacts. A total of 44 patients with cerebral aneurysm, treated using clipping surgery, were included in this study. The metal artifact volume was assessed using CTA and the association between the type of clips and its metal artifact volume was analyzed. A VR image and a 4D-CTA were then produced, and the diagnostic accuracy of arteries around the clip or residual aneurysm on these images was evaluated. In the receiver operating characteristic (ROC) curve analysis, the cutoff value for metal artifacts was 2.32 mm3 as determined through a VR image. Patients were divided into two groups. Group 1 included patients with a simple and small clip, and group 2 included patients with multiple, large or fenestrated clips. The metal artifact volume was significantly larger in group 2, and the group incorporated the cutoff value. Post-clipping status on the VR image was significantly superior in group 1 compared with group 2. In group 2, the imaging quality of post-clipping status on 4D-CTA was superior in 92.9% of patients. The metal artifact volume was dependent on the number, size, or configuration of the clip used. In group 2, evaluation using a 4D-CTA eliminated the effect of the metal artifacts.

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Authors and Affiliations

  1. Department of Neurosurgery, Sapporo Medical University, South 1 West 16, Chuo-ku, Sapporo, 060-8543, Japan

    Yusuke Kimura, Takeshi Mikami, Kei Miyata, Hime Suzuki, Katsuya Komatsu & Nobuhiro Mikuni

  2. Division of Radiology, Sapporo Medical University Hospital, Sapporo, Japan

    Toru Hirano

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  1. Yusuke Kimura
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  2. Takeshi Mikami
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  3. Kei Miyata
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Correspondence to Takeshi Mikami.

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Kimura, Y., Mikami, T., Miyata, K. et al. Vascular assessment after clipping surgery using four-dimensional CT angiography. Neurosurg Rev 42, 107–114 (2019). https://doi.org/10.1007/s10143-018-0962-0

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