| 摘要: |
| 目的 探讨在自由呼吸条件下，2种飞利浦CT机型胸部扫描参数对图像质量的影响。方法 前瞻性纳入80例在飞利浦256层CT上进行检查（40例采用常规扫描模式，40例采用快速扫描模式）及80例在飞利浦16层CT上进行检查（40例采用常规扫描模式，40例采用快速扫描模式）的患者。256层常规扫描组在深吸气后控制呼吸条件下选择常规螺旋模式，螺距为0.977；256层快速扫描组在自由呼吸条件下选择快速螺旋模式，螺距为1.473；16层常规扫描组在深吸气后控制呼吸条件下选择常规螺旋模式，螺距为1；16层快速扫描组在自由呼吸条件下选择快速螺旋模式，螺距为1.472。对4组图像质量客观评价指标进行比较，并由2名资深胸部诊断医师主观评价图像质量并评分，分析2名医师主观评分的一致性。结果 客观评价图像质量结果显示，密度分辨率比较256层快速扫描组 > 16层快速扫描组 > 16层常规扫描组 > 256层常规扫描组，空间分辨率比较16层常规扫描组 > 16层快速扫描组 > 256层快速扫描组 > 256层常规扫描组，背景噪声比较16层常规扫描组 > 16层快速扫描组 > 256层常规扫描组 > 256层快速扫描组。主观评价图像质量结果显示，2名医师对图像质量评分的一致性较好（Kappa值=0.91）。结论 256层快速CT扫描能有效改善自由呼吸条件下CT图像的呼吸伪影。 |
| 关键词: 自由呼吸 胸部 X线计算机体层摄影术 扫描参数 图像质量 |
| DOI：10.16781/j.0258-879x.2021.10.1193 |
| 投稿时间：2020-04-08修订日期：2021-03-04 |
| 基金项目: |
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| Effect of parameter optimization of different models of chest computed tomography on image quality under free breathing |
| ZHANG Ye,ZHU Jie,LI Jia-yu,YIN Wei,WANG Min-jie* |
(Department of Radiology, Changhai Hospital, Naval Medical University(Second Military Medical University), Shanghai 200433, China
*Corresponding author) |
| Abstract: |
| Objective To explore the effects of chest scanning parameters of 2 Philips computed tomography (CT) models on image quality under free breathing. Methods Eighty patients examined on Philips 256-multislice CT (40 cases using conventional scan mode and 40 cases using fast scan mode) and 80 patients examined on Philips 16-multislice CT (40 cases using conventional scan mode and 40 cases using fast scan mode) were prospectively enrolled. In the 256-and 16-multislice CT conventional scan groups, the conventional spiral mode was selected under the control of breathing after deep inhalation, and the pitch was 0.977 and 1, respectively. In the 256-and 16-multislice CT fast scan groups, the fast spiral mode was selected under free breathing, and the pitch was 1.473 and 1.472, respectively. The objective evaluation indexes of image quality were compared among the 4 groups. The image quality was evaluated and scored by 2 senior chest diagnostic physicians, and the consistency of subjective scores between the 2 physicians was analyzed. Results The objective evaluation results of image quality showed density resolution:256-multislice CT fast scan group > 16-multislice CT fast scan group > 16-multislice CT conventional scan group > 256-multislice CT conventional scan group; spatial resolution:16-multislice CT conventional scan group > 16-multislice CT fast scan group > 256-multislice CT fast scan group > 256-multislice CT conventional scan group; and background noise:16-multislice CT conventional scan group > 16-multislice CT fast scan group > 256-multislice CT conventional scan group > 256-multislice CT fast scan group. The subjective evaluation results of image quality showed that the consistency of image quality score between the 2 physicians was good (Kappa=0.91). Conclusion The 256-multislice CT fast scan can effectively reduce image respiratory artifacts under free breathing. |
| Key words: free breathing chest X-ray computed tomography scanning parameters image quality |
