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第五节 CT 检查技术参数

第五节 CT 检查技术参数. 1. 扫描类型 常规扫描 螺旋扫描 通常颅脑、椎间盘扫描选用常规扫描，胸部、腹部扫描及增强扫描选用螺旋扫描 2. 曝光条件 管电压 100 ～ 140kV 管电流 70 ～ 260mA 总曝光时间 6 ～ 20s X 线剂量降低时，噪声增大，图像质量降低. 3. 视野 FOV （ field of view ） 扫描野 scanning field of view ， SFOV 显示野 displaying field of view ， DFOV 扫描野一般为 50cm

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第五节 CT 检查技术参数

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  1. 第五节 CT检查技术参数

  2. 1.扫描类型 • 常规扫描 螺旋扫描 • 通常颅脑、椎间盘扫描选用常规扫描，胸部、腹部扫描及增强扫描选用螺旋扫描 • 2.曝光条件 • 管电压100～140kV 管电流70～260mA • 总曝光时间6～20s • X线剂量降低时，噪声增大，图像质量降低

  3. 3.视野FOV（field of view） • 扫描野scanning field of view，SFOV • 显示野displaying field of view， DFOV • 扫描野一般为50cm • 显示野：腰椎间盘15.0cm 肺36.0cm

  4. 颅脑扫描视野25.0 cm 胸部扫描视野36.0 cm

  5. 4.矩阵matrix • 256×256，512×512等 • 矩阵越大，空间分辨力越高 • 5.层厚slice thickness • 层厚小，图像纵向空间分辨力好，噪声增大 • 扫描层厚可从2.0～10.0mm不等，目前高档CT机等的扫描厚度可达0.33mm

  6. 6.层距slice gap • 若层距与层厚相等，则为连续扫描 • 若层距大于层厚，则为间断扫描 • 若层距小于层厚，则为重叠扫描

  7. THE END

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