Coronal reformations of volumetric expiratory high-resolution CT of the lung.
Coronal reformations of volumetric expiratory high-resolution CT of the lung.
复制标题
肺容积呼气高分辨率 CT 的冠状重建。
DOI：
10.2214/ajr.182.4.1820979
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
H. Hatabu
中科院分区：
文献类型：
--
作者：
M. Nishino;M. Kuroki;P. Boiselle;J. Copeland;V. Raptopoulos;H. Hatabu
目标
本研究的目的是评估从容积呼气高分辨率 CT 成像获得的冠状重新格式化图像的质量，并比较冠状和轴向图像在检测和表征空气滞留方面的有用性。主题和方法。我们连续研究了 40 名患有已知或疑似弥漫性肺病并伴有气道异常的患者，这些患者在 2003 年 5 月至 7 月期间接受了呼气容积高分辨率 CT 扫描。对上、中和下肺区域的呼吸运动伪影进行了评估。对整个肺野的心脏运动、束硬化和其他伪影进行了评估。在轴向与冠状呼气末高分辨率 CT 图像上比较空气滞留的可检测性、边界清晰度、尺寸、分布和程度。
结果
除 3 名患者 (7%) 的下肺区域图像质量下降具有诊断限制外，所有患者的呼吸运动伪影要么难以察觉，要么不具有诊断限制。其他诊断限制性图像退化是由两名患者 (5%) 的光束硬化伪影和另外两名患者 (5%) 的量子噪声引起的。冠状图像上的空气滞留边界比轴向图像更清晰（1 级[模糊]，9 比 3；2 级[部分清晰]，23 比 21；3 级[完全清晰]，8 比 16；中值，2 比 2；p = 0.001）。冠状重新格式化图像与轴向图像一样提供信息，用于检测和评估空气滞留的分类和程度。
结论
呼气容积高分辨率 CT 扫描的冠状重建在图像质量方面是可以接受的，并且通过提供比连续轴向图像更清晰的空气滞留边界可视化来提供附加价值。
OBJECTIVE
The purposes of this study were to evaluate the quality of coronal reformatted images obtained from volumetric expiratory high-resolution CT imaging and to compare coronal and axial images with regard to their usefulness in detecting and characterizing air trapping. SUBJECTS AND METHODS. We studied 40 consecutive patients with known or suspected diffuse lung diseases with airway abnormalities who underwent volumetric expiratory high-resolution CT between May and July 2003. Respiratory motion artifacts were evaluated at upper, middle, and lower lung areas. Cardiac motion, beam-hardening, and other artifacts were evaluated throughout the lung fields. Detectability, clarity of borders, size, distribution, and extent of air trapping were compared on axial versus coronal end-expiratory high-resolution CT images.
RESULTS
Respiratory motion artifacts were either imperceptible or not diagnostically limiting in all patients except three (7%) with diagnostically limiting image degradation at lower lung areas. Other diagnostically limiting image degradation was caused by beam-hardening artifacts in two patients (5%) and by quantum noise in two other patients (5%). The borders of air trapping were more clearly identified on coronal images than on axial images (grade 1 [vague], nine vs three; grade 2 [partially clear], 23 vs 21; grade 3 [completely clear], eight vs 16; median, two vs two; p = 0.001). The coronal reformatted images were as informative as axial images for detecting and assessing the classification and extent of air trapping.
CONCLUSION
Coronal reformations of volumetric expiratory high-resolution CT scans were acceptable in image quality and provided additional value by affording clearer visualization of the borders of air trapping than was found in contiguous axial images.