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１ 仪器和方法１－１ 仪器使用美国ＧＥ公司生产ＳＹＴＥＣ４０００型和ＰＱ６０００型高档螺旋ＣＴ断层扫描仪。１－２ 决定空间分辨率的因素高分辨率ＣＴ（ｈｉｇｈｒｅｓｏｌｕｔｉｏｎｃｏｍｐｕｔｅｒｔｏｍｏｇｒａｐｈｙ，ＨＲＣＴ）是用１ｍｍ层厚ＣＴ扫描取样并用?
1 instruments and methods 1-1 instrument using the United States GE company SYTEC4000 and PQ6000 type high-grade spiral CT tomography. 1-2 Factors Determining Spatial Resolution High-resolution computed tomography (HRCT) is a 1-mm-thick CT scan sampling and use?