图像的感知与获取 Film Sensor Rotation Linear motion ()单个传感器运动产生二维图像 Image Cross-sectional images One image line out per of 3-D object increment of linear motion Imaged area 3-D object Linear motion X-ray soure Sensor strip Linear motion Sensor ring (b)线传感器带获取图像（扫描仪，传真） (©)环形传感器带获取图像 (CT,核磁共振)