OBJECTIVE:The purpose of our study was to evaluate the effects of 0.3-second high-resolution CT (HRCT) of the lung using partial reconstruction on cardiac motion artifacts and image noise. SUBJECTS AND METHODS:Thirty-seven pairs of 0.3-second (partial reconstruction) and 0.75-second (full reconstruction) HRCT images were obtained for the lower lung zone during full-inspiration breath-holding. Imaging parameters other than temporal resolution were identical for each patient. Two radiologists visually graded motion artifacts of the cardiac border, bronchi, pulmonary vessels, and fissure in the left lung on a 4-point scale (with 4 indicating no artifacts). The maximum width of motion along the left cardiac border and the area percentage of motion artifacts in the left lung were calculated. Image noise in the air and lung was also determined. Cardiac motion artifacts and image noises were compared between the two sets of CT images. RESULTS:Visual grades for the cardiac border (4 +/- 0), bronchi (3.8 +/- 0.7), pulmonary vessels (3.6 +/- 0.8), and fissure (3.9 +/- 0.5) were higher for 0.3-second images than for 0.75-second images (1.7 +/- 0.7, 2.0 +/- 1.0, 1.6 +/- 0.7, and 2.4 +/- 0.9, respectively) (p < 0.001). The maximum width of motion along the left cardiac border (0.1 +/- 0.5 mm) and the area percentage of motion artifacts in the left lung (6.7% +/- 18.4%) were smaller for 0.3-second images than for 0.75-second images (4.5 +/- 1.7 mm and 36.2% +/- 20.9%, respectively) (p < 0.001). Image noises in the air (38.0 +/- 9.2) and the lung (86.0 +/- 23.1) were greater for 0.3-second images than for 0.75-second images (35.6 +/- 9.6 and 76.0 +/- 20.3, respectively) (p < 0.01). CONCLUSION:Compared with 0.75-second HRCT using full reconstruction, 0.3-second HRCT using partial reconstruction substantially reduces cardiac motion artifacts in the lung at the expense of increasing image noise.

译文

目的:本研究的目的是通过部分重建对心脏运动伪影和图像噪声的效果,评估0.3秒高分辨率肺部CT(HRCT)的影响。
研究对象和方法:在全屏吸气时,获得了37对0.3秒(部分重建)和0.75秒(完全重建)的HRCT图像,用于下肺区。对于每个患者,除时间分辨率以外的成像参数均相同。两位放射科医生对心脏边界,支气管,肺血管和左肺裂的运动伪影进行了4分制的视觉分级(其中4表示没有伪影)。计算沿左心脏边界的最大运动宽度和左肺中运动伪影的面积百分比。还确定了空气和肺中的图像噪声。比较两组CT图像之间的心脏运动伪影和图像噪声。
结果:0.3秒图像的心脏边界(4 /-0),支气管(3.8 /-0.7),肺血管(3.6 /-0.8)和裂痕(3.9 /-0.5)的视觉等级高于0.75秒图像(分别为1.7 /-0.7、2.0 /-1.0、1.6 /-0.7和2.4 /-0.9)(p <0.001)。对于0.3秒的图像,沿左心脏边界的最大运动宽度(0.1 /-0.5 mm)和左肺中的运动伪影的面积百分比(6.7%/-18.4%)小于0.75秒的图像(分别为4.5±1.7毫米和36.2%±20.9%(p <0.001)。对于0.3秒的图像,空气(38.0 /-9.2)和肺(86.0 /-23.1)的图像噪声大于0.75秒的图像噪声(分别为35.6 /-9.6和76.0 /-20.3)(p <0.01 )。
结论:与使用完全重建的0.75秒HRCT相比,使用部分重建的0.3秒HRCT可以显着减少肺部的心脏运动伪影,但会增加图像噪声。

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