Costello P
Department of Radiological Sciences, Deaconess Hospital, Boston, MA 02215.
Radiographics. 1994 Jul;14(4):913-8. doi: 10.1148/radiographics.14.4.7938778.
Helical CT depicts small pulmonary nodules not seen at conventional CT by elimination of respiratory misregistration and thorough analysis of a contiguous data volume. Pulmonary lesions can be analyzed in detail with use of retrospective reconstruction of the data volume. Multiplanar and three-dimensional images of lung masses and arteriovenous malformations are free of motion artifacts. The airways are clearly depicted by helical CT, a capability that enhances the radiologic evaluation of patients with hemoptysis, bronchial strictures, tumors, and recent lung transplantation. In comparison to conventional CT, helical CT provides a more consistent level of vascular enhancement because of the shortened acquisition time. Clinical applications include the detection of central pulmonary thromboemboli and the assessment of aortic aneurysms and dissections.
螺旋CT通过消除呼吸配准误差并对连续数据容积进行全面分析，能够显示传统CT无法发现的小肺结节。利用数据容积的回顾性重建可以对肺部病变进行详细分析。肺肿块和动静脉畸形的多平面和三维图像没有运动伪影。螺旋CT能够清晰显示气道，这一功能增强了对咯血、支气管狭窄、肿瘤及近期肺移植患者的放射学评估。与传统CT相比，由于采集时间缩短，螺旋CT能提供更一致的血管强化水平。临床应用包括中央型肺血栓栓塞症的检测以及主动脉瘤和主动脉夹层的评估。
