| 摘要 |
PCT No. PCT/SE93/00670 Sec. 371 Date Feb. 10, 1995 Sec. 102(e) Date Feb. 10, 1995 PCT Filed Aug. 12, 1993 PCT Pub. No. WO94/04077 PCT Pub. Date Mar. 3, 1994In rhinostereometric measurement, the positions in a fixed coordinate system are determined for a number of points on the nasal mucosa of a test subject. To obtain comparable results on different measuring occasions, the head of the test subject must occupy the same position in the coordinate system every time. By determining the position of a test subject's face in the coordinate system on every occasion of rhinostereometric measurement and transposing the measuring position of the face in the coordinate system to a reference position, the values of the points in the nose can be corrected for the displacement of the face from the reference position that has taken place since the last measurement, thereby to obtain comparable results that are always related to a reference position. Preferably, the position of the face in the coordinate system is determined by measuring the distance between fixed locations in the coordinate system and points in the test subject's face with the aid of distance-measuring lasers (8-12) mounted on a fixed frame (3) in the coordinate system. The displacement of the test subject's head is minimized by the mechanical fixing device (5) in the form of a spectacle frame. The measured values are processed in a computer (13). |
