頭部ＣＴ‐ＭＲ画像のマーカレス３次元位置合わせ

DOI Web Site 被引用文献4件 参考文献10件

書誌事項

タイトル別名
  • Markerless Three-Dimensional CT-MR Registration of Head Images.
  • トウブ CT-MR ガゾウ ノ マーカレス 3ジゲン イチアワセ

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We developed a new registration method based on surface matching of multi-modality medical images. This correlation procedure does not need any artificial markers but uses partial body surface information. This allows our registration method to be applied to patients whose body structure has been changed partially (e. g. by surgery or other medical treatment) in the interval between the acquisition of the two data to be correlated. This method consists of three steps. First, body surfaces of the two data are segmented by thresholding and represented in the form of z-buffers. Next, the operator selects ROIs for the matching on the surface of one of the data. Finally, the registration matrix relating the two data is calculated using an algorithm based on the downhill simplex optimization. The cost function of the optimization procedure is the root mean square of the distance the ROIs and the surface of the second data. We present a validation of the accuracy and reliability of this registration method by using X-ray CT and MR phantom data. In the application of surgical planning and diagnosis of cerebral and craniofacial surgery, a registration accuracy better than 1mm is requested. By using more than three ROIs (ROI diameter>40mm), this condition was achieved with a reliability better than 90% in the phantom study. The distortion of the MR images was estimated during the validation. To guarantee our condition of accuracy, the correction parameters of the distortion has to be taken into account during the registration procedure. The accuracy and the effectiveness of the method were confirmed visually on X-ray CT and MR images of the head.

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