Helical CT Virtual Cystoscopy:the Clinical Applications and Limitations / 实用放射学杂志

ABSTRACT

Objective To evaluate the clinical applications and limitations of helical CT virtual cystoscopy (CTVC).Methods CTVC was performed in 36 patients suspected bladder diseases, all cases were confirmed by conventional cystoscopy and pathology. CTVC images were generated from the volumetric data of the excretory phase using helical CT. The results were then compared with the findings of axial images and conventional cystoscopy in a double-blinded manner. Results CTVC could clearly display the normal anatomic structures of bladder, 11 ureteric orifices were visualized at CTVC in 7 of 8 normal bladders. The location, size, numbers, configuration and extension of lesions showed on CTVC were corresponded well with that of conventional cystoscopy. The sensitivity to vesical carcinoma was 94.7%,2 tumors smaller than 5 mm depicted on CTVC images were not seen on the axial images, whereas areas of wall thickening and extravesical invasions were more readily appreciated on axial and MPR images. There was 1 false lesions detected on CTVC images. Conclusion CTVC has proved to be a noninvasive and reliable technique in the detection and diagnosis of bladder lesions, but the optimal evaluation requires adequate bladder filling with contrast medium, and should combine with the interpretation of axial and MPR images.