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螺旋CT的问世,使病人肝脏三相扫描(即肝动脉强化期、门静脉强化期和延迟期)能够实现。本文阐述了肝肿瘤(富血供肿瘤和乏血供肿瘤)螺旋CT三期相检测的理论根据。讨论了对比剂类型、注射量与注射率、从静脉注射对比剂开始到CT扫描开始之间的延迟时期等因素,以及层厚(准直器宽)、螺距等技术条件的选择。分析了三期相螺旋CT各期相对肝脏小结节性病灶检出率及定性诊断的价值,以及肝螺旋CT扫描的伪影和潜在的误区。
The advent of spiral CT, the patient’s liver three-phase scan (ie, hepatic artery enhancement, portal vein enhancement and delay) can be achieved. This article describes the theoretical basis for the detection of the third phase of the spiral CT of liver tumors (rich blood for tumor and lack of blood for the tumor). The types of contrast medium, injection volume and injection rate, the delay period from the start of intravenous injection of contrast agent to the start of CT scan, and the selection of technical conditions such as layer thickness (collimator width) and pitch were discussed. The relative rates of small nodular lesions and the value of qualitative diagnosis in each stage of phase III phase spiral CT as well as the artifacts and potential misunderstandings of hepatic helical CT scan were analyzed.