目的探讨应用Revolution CT行轴位全肾脏灌注成像,扫描持续时间对灌注参数值的影响。资料与方法前瞻性研究双侧肾脏无器质性病变患者42例,按照灌注扫描持续时间将患者分为短灌注组(A组)和长灌注组(B组)。使用Revolution CT机轴扫模式进行灌注扫描,探测器宽度16 cm。A组采用管电压80 k Vp,管电流200 m A,每2 s(曝光0.5 s,间隔1.5 s)采集1次,共采集25期图像,总灌注时间50 s。B组采用管电压120 k Vp,管电流55 m A,采用间隔采集,每次采集时间均为2 s(曝光0.5 s,间隔1.5 s),最终获得23期图像,总灌注时间为594 s。使用CT Perfusion4D灌注软件包进行后处理,选择右侧肾门水平腹主动脉为输入动脉,得到灌注参数图。分别比较两组组内双侧肾脏皮髓质间各灌注参数及两组间肾脏皮髓质各灌注参数间的差异。记录CT容积剂量指数(CTDIvol)及剂量-长度乘积(DLP),计算并比较有效剂量(ED)。结果两组组内双侧肾脏各灌注参数对比差异无统计学意义(P>0.05)。两组间肾脏皮、髓质的血容量、达峰时间及表面通透性差异均有统计学意义(P<0.05...
【英文摘要】
Purpose To explore the influence of duration of scan acquisition on perfusion parameters in whole renal perfusion with Revolution CT. Materials and Methods Fortytwo patients without pathologic changes in bilateral kidneys were divided into group A(with short perfusion time) and group B(with long perfusion time) according to the duration time of the perfusion scan. The Revolution CT axial scan mode was used for perfusion scan, and the width of detector was 16 cm. The perfusion CT series were performed in 50 ...