| 摘要 |
PURPOSE:To calculate the accurate position of a specific region without receiving the effect of the non-uniformity of a static magnetic field, by mounting a gauge for stereotaxis having a curved part curved toward an object to be examined. CONSTITUTION:Gauges 12, 13 are provided wit curved parts A so that the distances (r) from a z-axis (center point) becomes almost equal. By performing scanning in such a state that the gauges 12, 13 are arranged in close vicinity to the periphery of an object 1 to be examined, the image shown by a drawing is obtained. Since the positions of the marker images 12a, 12b of the gauges 12, 13 on the image change corresponding to an arbitrary slice depth, the position (x0, y0, z0) of the affected part 6 can be calculated on a coordinates system by calculating said position. In this case, since the shapes of the gauges 12, 13 correspond to the surface of the body of the object 1 to be examined and said gauges are arranged so that the distances (r) from the center point of said object are almost equal, the whole of the gauges is received in a region less in the non-uniformity of a static magnetic field and, therefore, the strain of the marker images becomes small. As a result, the position of the affected part 6 of the object to be examined on coordinates can be accurately detected. |
