| 摘要: |
| 目的：应用64层螺旋CT血管造影减影软件进行头颈部动脉CT血管成像，探讨新的半自动减影软件的使用方法并评价效果。方法：100例患者经过头颈部CT平扫及增强扫描，扫描期间使用特殊的头部固定装置利于图像配准，通过减影软件将增强前骨骼的三维模型从增强后的数据中减去，得到头颈部血管减影图像。（1）让1名有经验的操作者分别对这100例患者进行常规血管成像和减影血管成像，记录图像处理时间。（2）让2位资深放射科医生双盲评价两种方法做出的头颈部动脉图像并按质量等级（1～5级）进行评分。 结果：（1）两种图像处理方法所需时间具有统计学差异（14.30±2.25 min vs 11.01±1.89 min，P<0.01）,减影组比常规组明显节省了时间。（2）两位盲法观察者的相关系数达到0.87，具有很高的相关性，结合两位观察者的数据，常规法与减影法得到的头颈部动脉图像质量有统计学差异(评分为2.93±0.36 vs 4.22±050，P<0.05)，减影法图像质量优于常规法图像。结论：在头颈部CT血管造影中，64层螺旋CT血管造影减影技术操作简便、省时，较好的克服了常规方法难以从骨骼中提取血管的难题，有较好的推广应用前景。 |
| 关键词: 体层摄影术，螺旋计算机 减影技术 血管造影术 狭窄 动脉瘤 |
| DOI：10.3724/SP.J.1008.2007.01201 |
| 投稿时间：2007-07-24 |
| 基金项目: |
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| Subtraction technique of 64-slice spiral CT angiography for intra- and extra-cranial artery imaging |
| CHENG Xiao-qing,ZUO Chang-jing*,,TIAN Jian-ming,SHAO Cheng-wei,WANG Min-jie,SHENG Jing,XIAO Yi |
| (Department of Radiology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China) |
| Abstract: |
| Objective：To employ the subtraction technique of 64slice spiral CT angiography for intra and extracranial arteries imaging, so as to study the managing method and assess the clinical outcome. Methods: The precontrast and postcontrast images of 100 patients were obtained by 64slice spiral CT angiography. A special head holder was used during the scanning to guarantee the accurate overlapping of the precontrast and postcontrast images. A reconstructed threedimensional model of the precontrast bone dataset was subtracted from the postcontrast dataset to produce the subtracted images. (1) An experienced operator performed the conventional and subtraction reconstructions; the periods for image generation of both methods were recorded and compared. (2) The quality of the images were evaluated and graded (grade 15) by 2 experienced radiologists in a doubleblinded manner. Results: (1) The new subtraction technique using 64slice spiral CT angiography needed significantly less time than the conventional method did (11.01±1.89 min vs 14.30±2.25 min，P<0.01). (2) The correlation coefficient of the results of 2 radiologists was 0.87. The score of image quality by subtraction 64slice spiral CT angiography was significantly higher than that by the conventional method (4.22±050 vs 2.93±0.36，P<0.05).Conclusion: Subtraction 64slice spiral CT angiography is easy to use and time saving for intra and extracranial artery imaging; it does not has the difficulty of separating artery from bone and is worth popularizing in clinic. |
| Key words: tomography,spiral computed subtraction technique angiography stenosis aneurysm |
