Clinic of the Goethe University, Department of Diagnostic and Interventional Radiology, Frankfurt, Germany.
J Thorac Imaging. 2012 Nov;27(6):376-81. doi: 10.1097/RTI.0b013e318250067e.
To investigate pulmonary arterial (PA) enhancement, image noise, and artifacts related to breathing and heart motion in patients with suspected pulmonary embolism.
Seventy-six consecutive patients underwent computed tomographic pulmonary angiography (CTPA) in dual-source high-pitch mode (pitch 3.0, 100 kV, 180 mAs, 50 mL contrast material) without breathing commands. PA enhancement, image noise, signal to noise ratio, overall image quality, incidence of total or partial interruption of the contrast column in the PAs, and heart motion-related and breathing-related artifacts of the diaphragm and pulmonary structures were recorded.
Mean central and peripheral PA attenuation was 404 ± 104 and 453 ± 119 HU; mean image noise was 11 ± 2 HU; mean examination time was 0.67 ± 0.09 s; and mean dose-length product was 142 ± 31 mGy cm. There were no motion artifacts of the diaphragm or pulmonary vessels related to breathing or heart motion. There was no case of partial or total interruption of the contrast column in the PA tree. No examination was rated nondiagnostic.
High-pitch dual-source CTPA in freely breathing patients effectively produces images that are free of artifacts related to breathing and cardiac motion. Hence, Valsalva-related artifacts can be eliminated using this technique.
研究怀疑患有肺栓塞的患者的肺动脉（PA）增强、图像噪声和与呼吸及心脏运动相关的伪影。
76 例连续患者在双源高速模式（螺距 3.0、100kV、180mAs、50ml 造影剂）下行计算机断层肺动脉造影（CTPA），无需呼吸指令。记录 PA 增强、图像噪声、信噪比、整体图像质量、PA 中对比柱的完全或部分中断的发生率、膈肌和肺结构与心脏运动及呼吸相关的伪影。
中心和外周 PA 衰减的平均值分别为 404±104HU 和 453±119HU；平均图像噪声为 11±2HU；平均检查时间为 0.67±0.09s；平均剂量长度乘积为 142±31mGy cm。没有与呼吸或心脏运动相关的膈肌或肺血管运动伪影。PA 树中没有部分或完全中断对比柱的情况。没有检查被评为不可诊断。
在自由呼吸的患者中，高速双源 CTPA 可有效地产生无呼吸和心脏运动相关伪影的图像。因此，这项技术可以消除瓦氏动作相关的伪影。
