Study of multi-slice helical CT perfusion imaging in cerebral neoplasms / 中华放射学杂志

ABSTRACT

Objective To study the potential of multi-slice spiral CT perfusion imaging in the assessment of cerebral neoplasms.Methods Multi-slice helical CT perfusion imaging was performed in 38 patients with cerebral tumors.The perfusion imaging of the tumor was carried out by cine scan technique (ls/1 rotation) with slice thickness 5 mm/4i,reconstructed slice thickness 10 mm/2i.Contrast injection was done by using 50 ml nonionic contrast agent(300 mg I/ml),at a flow rate of 3.5 ml/s with a power injector,and 5 seconds delay,and data acquisition lasted for 45 seconds.The scanning images were processed in ADW 4.0 workstation.BF、BV、PS values of tumors were calculated and statistically analysed. Results 38 patients with cerebral neoplasms included 9 cases of gradeⅠ—Ⅱgliomas(group 1),10 cases of gradeⅢ—Ⅳgliomas (group 2),9 eases of metastases (group 3)and 10 cases of meningiomas (group 4).All raw data was transformed to square root so as to be consistent with normal distribution.BF~(1/2) values for groupl to group 4 were (5.99?1.03)、(7.55?1.57)、(7.72?2.02 )、(11.40?2.13)ml?rain~(-1)?kg~(-1).The differences in BF~(1/2) were statistically significant between group 1 and group 2,between group 1 and group 3,between group 1 and group 4,between group 2 and group 4,between group 3 and group 4(t_(1,2)=6.89,t_(1,3)=4.59,t_(1,4)=11.03,t_(2.4)=10.58,t_(3,4)=7.65,P＜0.05),and there was no statistically significant difference between group 2 and group 3(t_(2.3)=1.17,P＞0.05);BF~(1/2) values for groupl to group 4 were (1.01?0.19)、(1.42?0.38)、(1.25?0.33)、(1.60?0.24)ml?kg~(-1).The differences in BF~(1/2) were statistically significant between every two groups (t_(1,2)=7.15,t_(1.3)=3.71, t_(1.4)=5.93,t_(2.3)=2.94,t_(2,4)=2.72,t_(3.4)=4.46,P＜0.05 );PS~(1/2) values for groupl to group 4 were (1.70?0.37)、(3.63?0.95)、(4.29?1.30)、(5.69?1.03)ml?min~(-1)?kg~(-2).The differences in PS~(1/2) were statistically significant between every two groups(t_(1.2)=11.53,t_(1.3)=10.61,t_(1.4)=16.77,t_(2.3)=3.69, t_(2,4)=9.94,t_(3,4)=5.52,P＜0.05).Conclusion Multi-slice helical CT perfusion imaging is very useful to evaluate tumor vessels of cerebral neoplasmas and it can provide information of incremental benefit in diagnosis,in staging of tumor grade,in the distinction of benign from maglignant cerebral neoplasmas and in differentiating intracerebral neoplasmas from extracerebral neoplasmas.