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方法：·如厂家已提供可按厂家方法。·将体模放在扫描架内、细丝经过旋转中心且与扫描面垂直，保证床与扫描架不倾斜。·用最高mAs和最窄层厚标准头部条件扫描体模。·不改变照射野（FOV）用窄窗检查有无伪影。·选择ROI得到经过图像中心的一列象素值。·确定所得像素列的角度
Methods: · If the manufacturer has provided the method according to the manufacturer. • Place the phantom in the gantry, passing the filament through the center of rotation and perpendicular to the scan surface to ensure that the bed and gantry are not tilted. • Scan the phantom with the highest mAs and the narrowest layer thickness standard head conditions. • Check the presence or absence of artifacts with a narrow window without changing the field of radiation (FOV). Select ROI to get a list of pixel values that pass through the center of the image. · Determine the angle of the resulting pixel column