摘要
螺旋CT技术最显著的特征是X线球管围绕病人旋转时，扫描床上病人连续通过机架。由于滑环技术的发明，螺旋CT于1989年投入临床应用，它被广泛接受并成功地应用于人体各个部位的检查。由于产生容积数据，螺旋CT产生较少的呼吸遗漏扫描且可允许重建，提高了Z轴的分辨率。螺旋CT较单层切面CT的优点是快速容积数据获得，较短的检查时间。最小程度地减少了运动伪影和漏扫，可获得高质量的重建图像。能够回顾性地从原始数据中产生重叠间隔图像，就避免了另外的扫描。这些优点特别适合于需快速和精确成像急症病人、多发创伤患者和小儿。它还应用于CT血管造影（CTA）及其三维（3D）CTA成像。
The distinguishing characteristic of helical CT technology is thecontinuous movement of the patient on the table through the gantry as the x-raytube rotates around the patient. By inventing slip-ring gantry system, spiralcomputed tomography (CT) was introduced into clinical practice in 1989, it has gainedwidespread acceptance and has been applied successfully to all areas of the body.Because of producing a volumetric data set, helical CT results in less respiratorymisregistration and allows overlapping reconstructions, which improve the Z-axisresolution. The advantage of helical CT over single-section CT is faster acquisitionof a volumetric data set, resulting in shorter examination time. Motion andmisregistration artifacts are minimized, and high-quality reconstruction imagescan be obtaained in many instances, additional scanning after the initialacquisition is avoided by the ability to retrospectively generate overlappinginterscan images from the original data. These advantages are particularly relevantin acutely ill, multiple-trauma victims and children who require rapid and accurateimaging assessment. It has enabled new application such as CT angiography (CTA) andthree dimensional (3D) CTA.
出处
《CT理论与应用研究（中英文）》
1999年第2期23-25,共3页
Computerized Tomography Theory and Applications
