Goo Hyun Woo, Allmendinger Thomas
Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.
Siemens Healthcare, GmbH, Computed Tomography Division, Forchheim 91301, Germany.
Korean J Radiol. 2017 Sep-Oct;18(5):860-866. doi: 10.3348/kjr.2017.18.5.860. Epub 2017 Jul 17.
Cardiac and respiratory motion artifacts degrade the image quality of lung CT in free-breathing children. The aim of this study was to evaluate the effect of combined electrocardiography (ECG) and respiratory triggering on respiratory misregistration artifacts on lung CT in free-breathing children.
In total, 15 children (median age 19 months, range 6 months-8 years; 7 boys), who underwent free-breathing ECG-triggered lung CT with and without respiratory-triggering were included. A pressure-sensing belt of a respiratory gating system was used to obtain the respiratory signal. The degree of respiratory misregistration artifacts between imaging slabs was graded on a 4-point scale (1, excellent image quality) on coronal and sagittal images and compared between ECG-triggered lung CT studies with and without respiratory triggering. A value < 0.05 was considered significant.
Lung CT with combined ECG and respiratory triggering showed significantly less respiratory misregistration artifacts than lung CT with ECG triggering only (1.1 ± 0.4 vs. 2.2 ± 1.0, = 0.003).
Additional respiratory-triggering reduces respiratory misregistration artifacts on ECG-triggered lung CT in free-breathing children.
心脏和呼吸运动伪影会降低自由呼吸儿童肺部CT的图像质量。本研究的目的是评估心电图（ECG）联合呼吸触发对自由呼吸儿童肺部CT上呼吸配准错误伪影的影响。
共纳入15名儿童（中位年龄19个月，范围6个月至8岁；7名男孩），他们接受了有无呼吸触发的自由呼吸ECG触发肺部CT检查。使用呼吸门控系统的压力传感带来获取呼吸信号。在冠状面和矢状面图像上，根据4分制（1分，图像质量极佳）对成像层面之间的呼吸配准错误伪影程度进行分级，并在有无呼吸触发的ECG触发肺部CT研究之间进行比较。P值<0.05被认为具有统计学意义。
与仅采用ECG触发的肺部CT相比，联合ECG和呼吸触发的肺部CT显示出明显更少的呼吸配准错误伪影（1.1±0.4对2.2±1.0，P = 0.003）。
额外的呼吸触发可减少自由呼吸儿童ECG触发肺部CT上的呼吸配准错误伪影。
