论文部分内容阅读
目的 :探讨螺旋CT三维容积重建(VR)成像方法 ,评价其临床运用范围与价值。材料及方法 :VR三维重建47例 ,包括 :①血管组19例 ,②骨关节组16例 ,③其它部位组12例。扫描技术及造影剂使用参数据部位及病变性质具体设置 ,同时比较VR与表面遮盖法(SSD)及最大强度投影(MIP)。结果 :选择2或3个目标、合适的衰减值及不透明度的限值可获得良好的VR立体成像。VR能显示血管管腔、血管之间、血管与周围器官的相互关系 ,以及显示椎间盘、脑室、支气管等结构或其病变。SSD及MIP显示血管呈实性 ,周围结构相互阻挡 ,对椎间盘、脑室、支气管或其病变显示不佳。血管组病变13例包括血管动静脉畸形6例 ,血管栓塞、血管受脑膜瘤推压侵犯各2例 ,颈静脉球高位、烟雾病、胃底静脉曲张各1例 ;骨关节组病变14例 :颅底骨折8例 ,关节面骨折、关节脱位、椎间盘脱出各2例 ;其它部位组病变7例 :脑积水2例、支气管肺癌、恶性胃溃疡、肾外肾盂、输尿管结石、脑血肿各1例。结论 :VR -3D血管造影是快速而有效的无创伤血管成像术 ,优于SSD及MIP ,其中动静脉畸形、脑膜瘤、较大脑内血管分支阻塞可替代血管造影。骨关节显示清楚直观 ,有利于微细骨折、关节半脱位的诊断及测量 ,椎间盘、半月板显示具有独到之处。VR -3D在气管支气管、胃肠道、?
Objective: To investigate the spiral CT three-dimensional volume reconstruction (VR) imaging method to evaluate the scope and value of its clinical application. Materials and Methods: Three-dimensional VR reconstruction in 47 cases, including: ① vascular group 19 cases, ② bone and joint group 16 cases, ③ other parts of the group of 12 cases. Scanning technology and contrast media use parameters according to site and the nature of the lesion specific settings, while comparing the VR and the surface covering method (SSD) and the maximum intensity projection (MIP). Results: Choosing 2 or 3 targets, appropriate attenuation values, and opacity limits yielded good VR stereoscopic imaging. VR can display the vascular lumen, blood vessels, blood vessels and the relationship between the surrounding organs, as well as the disc, brain chamber, bronchus and other structures or lesions. SSDs and MIPs show that blood vessels are solid, the surrounding structures block each other, and the discs, ventricles, bronchi, or their lesions are poorly displayed. Vascular lesions in 13 cases, including vascular arteriovenous malformations in 6 cases, vascular embolism, vascular invasion by meningioma in 2 cases, high in the jugular bulb, moyamoya disease, gastric varices in 1 case; bone and joint disease in 14 cases: Skull fracture in 8 cases, articular surface fracture, joint dislocation, disc herniation in 2 cases; other parts of the group of disease in 7 cases: hydrocephalus in 2 cases, bronchial lung cancer, malignant gastric ulcer, renal pelvis, ureteral calculi, cerebral hematoma, 1 example. Conclusion: VR-3D angiography is a fast and effective non-invasive angiography, superior to SSD and MIP, arteriovenous malformations, meningioma and intracranial vascular branch blockade can replace angiography. Bone and joint showed clear and intuitive, is conducive to micro-fractures, subluxation of the joint diagnosis and measurement, disc, meniscus display is unique. VR-3D in tracheobronchial, gastrointestinal tract,?