MRI 誘導定位脳手術の基礎的検討 : target point の測定精度について

概要

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For stereotactic surgery with MRI, measuring the position of a target point is one of the important procedures. However, due to spatial distortion because of insufficient static field uniformity, some risk to errors is inevitable. So, we measured the spatial distortion of the two different MR scanners (0.15T, 0.5T) using a grid phantom and made an accuracy comparison between the outer marker and inner marker techniques. As a result, we recognized that the error is maximum at 4.8mm under the outer marker technique for the 0.5T MRI scanner, and yet, the lower magnetic field strength MRI causes more errors than the higher one. On the contrary, the inner marker technique which places a standard point near the target point error of only has a maximum 1mm. In conclusion, the inner marker technique should be applied in performing stereotactic surgery for the minimal positioning error.
公益社団法人日本放射線技術学会の論文
1991-05-01