Wang Dong, Zhang Wan-shi, Xiong Ming-hui, Yu Min, Xu Jia-xing
Department of Radiology, Air Force General Hospital, Beijing 100036, China.
Chin Med J (Engl). 2004 Jan;117(1):62-6.
There have been few studies to evaluate the effects of helical CT on bladder tumor. This study was to evaluate the clinical applications of helical CT dynamic contrast-enhanced axial imaging, multiplanar reformation (MPR), three-dimensional (3D) reconstruction and virtual cystoscopy (CTVC) in bladder tumors.
The precontrast and four-phase postcontrast helical CT scans were performed in 42 patients with bladder tumors confirmed by conventional cystoscopy and pathology. MPR, 3D and CTVC images were generated from the volumetric data of the excretory phase. The results were then compared with the findings of conventional cystoscopy and surgery in a double-blinded mode.
The sensitivity of the axial, 3D and CTVC images in detecting the bladder tumors were 90.8%, 76.9% and 95.4% respectively. The dynamic contrast-enhanced axial images could provide excellent intramural and extravesical information, and the accuracy in preoperative tumor staging was 87.7%. MPR could directly demonstrate the origin and extravesical invasions of the tumors and their relation to the ureter. 3D and CTVC images were useful for displaying the surface morphology of the tumor and the relationship between the tumor and the ureteric orifices, whereas CTVC could depict the tumors smaller than 5 mm that were not seen on the axial images.
The combination of axial, MPR, 3D and CTVC images with helical CT can provide comprehensive information on bladder tumor.
很少有研究评估螺旋CT对膀胱肿瘤的影响。本研究旨在评估螺旋CT动态对比增强轴位成像、多平面重建（MPR）、三维（3D）重建及虚拟膀胱镜检查（CTVC）在膀胱肿瘤中的临床应用。
对42例经传统膀胱镜检查及病理证实的膀胱肿瘤患者进行了平扫及四期增强螺旋CT扫描。从排泄期的容积数据生成MPR、3D及CTVC图像。然后以双盲模式将结果与传统膀胱镜检查及手术结果进行比较。
轴位、3D及CTVC图像检测膀胱肿瘤的敏感度分别为90.8%、76.9%及95.4%。动态对比增强轴位图像可提供出色的壁内及膀胱外信息，术前肿瘤分期的准确率为87.7%。MPR可直接显示肿瘤的起源、膀胱外侵犯情况及其与输尿管的关系。3D及CTVC图像有助于显示肿瘤的表面形态以及肿瘤与输尿管口的关系，而CTVC能够显示轴位图像上未见的小于5mm的肿瘤。
螺旋CT的轴位、MPR、3D及CTVC图像相结合可提供关于膀胱肿瘤的全面信息。
