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二、长程螺旋CT 长程螺旋CT或称长螺旋CT在本讲座中系指每个螺旋扫描周期大于24秒或覆盖两个解剖部位以上的扫描方式。诚如总则中所指出,长短螺旋扫描之间并无明确的划分标准,它受扫描部位与层厚,扫描条件及螺矩诸因素影响,仅是一种相对的界定而已,提请读者注意。 (一)颈部 范围 根据需要自颅底至肺炎或至主动脉弓上方。 定位片 250mm,120KV,50～100mA,侧位像。 造影剂 静脉给予,80ml,非离子型(ultravist300),含碘量300mg/ml,注射速率为2ml/S,压力注射器给予。 延迟时间 在团注射开始后40秒钟启动扫描。
Second, long-range spiral CT Long-range spiral CT or long spiral CT in this lecture refers to each spiral scan cycle is greater than 24 seconds or covering two anatomical sites above the scan mode. As pointed out in the General Provisions, there is no clear dividing standard between the length and the length of the helical scan. It is influenced by the scanning position and layer thickness, the scanning conditions and the screw torque. It is only a relative definition and draws the reader’s attention. (A) neck range from the skull base to pneumonia or to the aortic arch as needed. Positioning film 250mm, 120KV, 50 ~ 100mA, lateral image. Contrast media intravenously, 80ml, non-ionic (ultravist300), iodine content 300mg / ml, the injection rate of 2ml / S, given by a pressure syringe. Delay Time The scan was started 40 seconds after the bolus injection started.