| 刘玉林,陈宪,安连峰,陈军,杜东平,葛鸿惠,付荣.多层面螺旋CT 结肠仿真内镜的实验研究[J].中国医学影像技术,2005,21(1):29~32 |
| 多层面螺旋CT 结肠仿真内镜的实验研究 |
| Experimental study of multi-slice CT virtual colography in pig colon |
| 投稿时间：2004-08-10 修订日期：2004-09-02 |
| DOI： |
| 中文关键词: 多层螺旋CT 仿真内镜 结肠 动物,实验 |
| 英文关键词:Multi-slice spiral CT Virtual endoscopy Colon Animals, laboratory |
| 基金项目: |
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| 摘要点击次数: 2689 |
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| 中文摘要: |
| 目的探讨MSCT结肠仿真内镜优化的成像参数。方法 猪结肠8段,于肠壁内面模拟病变后行MSCT扫描,准直层厚1.0 mm、2.5 mm、5.0 mm,螺距 1.25、1.75及重叠重建率0％、50％、70％分别匹配,共16组图像分别行VC观察。结果 第1组(准直层厚1.0 mm,Pitch 1.25,重叠重建率50％)病变检出准确率最高,但与第2~4、9~12组病变检出率无明显差异,其中第12组(准直层厚2.5 mm,Pitch 1.75,重叠重建率50％)的扫描时间和CTDI最小,容积重建法VC的检出准确率高于表面重建法VC。结论 层厚和重叠重建率对MSCT VC的病变检出准确率有明显影响,优化参数为:准直层厚2.5mm,螺距 1.75,50％重叠重建,容积重建法VC。 |
| 英文摘要: |
| Objective To investigate the optimized parameters of multi-slice CT virtual colography (MSCT VC). Methods Eight segments of pig colon were resected and cleaned, and simulated polyps with different size were created on the mucosa of colon. Each specimen was scanned with collimation of 1.0 mm, 2.5 mm, 5.0 mm, and pitch of 1.25, 1.75, reconstructed with 0%, 50%, 70% overlap, respectively. The images were classified into 16 groups by different parameters, and VC with volume perspective-mode were processed. The accuracy of polyps detection was evaluated in each group. Results Group 1 (collimation 1.0mm, Pitch 1.25, overlap rate 50%) had the maximal accuracy of polyps detection, but there was no significant difference between group 1 and group 2-4, 9-12. Group 12 (collimation 2.5mm, Pitch 1.75, overlap rate 50%) had the least scan time and CTDI, but VC with volume perspective-mode was superior to that with surface perspective-mode. Conclusion In experimental condition, MSCT VC were significantly affected by the collimation and overlapping rate. The optimized parameters were as follows: collimation 2.5 mm, pitch 1.75 and 50% overlapped reconstruction, and with volume-perspective VC. |
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