Department of Radiology and Medical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan 49241, Republic of Korea.
Department of Radiology and Medical Research Institute, Yangsan Pusan National University Hospital, Pusan National University School of Medicine, Busan 50612, Republic of Korea.
Medicina (Kaunas). 2024 Aug 12;60(8):1301. doi: 10.3390/medicina60081301.
: This study's objective was to investigate the influence of increased scan speed and pitch on image quality and nodule volumetry in patients who underwent ultra-low-dose chest computed tomography (CT). : One hundred and two patients who had lung nodules were included in this study. Standard-speed, standard-pitch (SSSP) ultra-low-dose CT and high-speed, high-pitch (HSHP) ultra-low-dose CT were obtained for all patients. Image noise was measured as the standard deviation of attenuation. One hundred and sixty-three nodules were identified and classified according to location, volume, and nodule type. Volume measurement of detected pulmonary nodules was compared according to nodule location, volume, and nodule type. Motion artifacts at the right middle lobe, the lingular segment, and both lower lobes near the lung bases were evaluated. Subjective image quality analysis was also performed. : The HSHP CT scan demonstrated decreased motion artifacts at the left upper lobe lingular segment and left lower lobe compared to the SSSP CT scan ( < 0.001). The image noise was higher and the radiation dose was lower in the HSHP scan ( < 0.001). According to the nodule type, the absolute relative volume difference was significantly higher in ground glass opacity nodules compared with those of part-solid and solid nodules ( < 0.001). : Our study results suggest that HSHP ultra-low-dose chest CT scans provide decreased motion artifacts and lower radiation doses compared to SSSP ultra-low-dose chest CT. However, lung nodule volumetry should be performed with caution for ground glass opacity nodules.
本研究旨在探讨在接受超低剂量胸部 CT 检查的患者中，增加扫描速度和螺距对图像质量和结节体积测量的影响。
本研究纳入了 102 例肺部结节患者。所有患者均行标准速度、标准螺距（SSSP）超低剂量 CT 和高速、高螺距（HSHP）超低剂量 CT 检查。图像噪声作为衰减的标准差进行测量。根据位置、体积和结节类型对 163 个结节进行识别和分类。根据结节位置、体积和结节类型对检测到的肺结节的体积测量进行比较。评估右中叶、舌段和靠近肺底的下叶两处的运动伪影。还进行了主观图像质量分析。
与 SSSP CT 扫描相比，HSHP CT 扫描在左肺上叶舌段和左肺下叶显示出较低的运动伪影（<0.001）。HSHP 扫描的图像噪声更高，辐射剂量更低（<0.001）。根据结节类型，磨玻璃密度结节的绝对相对体积差异明显高于部分实性和实性结节（<0.001）。
我们的研究结果表明，与 SSSP 超低剂量胸部 CT 相比，HSHP 超低剂量胸部 CT 扫描可减少运动伪影并降低辐射剂量。然而，对于磨玻璃密度结节，肺结节体积测量应谨慎进行。
