Experimental study of multi-slice CT virtual colography in pig colon
LIU Yu lin *, CHEN Xian, AN Lian feng, CHEN Jun, DU Dong ping, GE Hong hui, FU Rong(Department of Radiology, Hubei Provincial Tumor Hospital, Wuhan 430079, China)
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.
【CateGory Index】： R816.5