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目的：比较使用不同剂量ＧｄＤＴＰＡ行慢速增强３ＤＤＣＥＭＲＡ成像时，ＰＶ，ＨＶ和ＩＶＣ的显示差别。材料与方法：４０名患者被随机分为两组，分别使用２０ｍｌ和３０ｍｌＧｄＤＴＰＡ，造影剂注射速率相同，均为０．５ｍｌ／ｓ。测量和比较两组ＭＲＡ原始图像上ＰＶ、ＨＶ和ＩＶＣ的ＳＩ、ＳＮＲ和ＣＮＲ各项指标。并对ＭＩＰ图像上这些血管的显影进行评价和比较。结果：使用３０ｍｌＧｄＤＴＰＡ，ＰＶ的ＳＩ、ＳＮＲ和ＣＮＲ均明显高于２０ｍｌ组（Ｐ＜０．０５，Ｐ＜０．０１，Ｐ＜０．０５），但在ＭＩＰ重建图上，两组间ＰＶ的显影效果却相仿（Ｐ＞０．０５）。３０ｍｌ组和２０ｍｌ组相比，不论是在原始图像还是在ＭＩＰ图像上，ＨＶ和ＩＶＣ的定量分析结果以及显示效果都相仿（Ｐ＞０．０５）。结论：当做ＰＶ、ＨＶ和ＩＶＣ慢速增强３ＤＤＣＥＭＲＡ成像时，没有必要把造影剂剂量从２０ｍｌ增大到３０ｍｌ
OBJECTIVE: To compare the differences of PV, HV and IVC when using different doses of Gd-DTPA to slowly increase 3DDCEMRA imaging. Materials and Methods: Forty patients were randomly divided into two groups: 20ml and 30ml GdDTPA respectively. The injection rate of contrast agent was the same, both of which were 0.5ml / s. The indexes of SI, SNR and CNR of PV, HV and IVC on the MRA original images of the two groups were measured and compared. The development of these vessels on MIP images was evaluated and compared. Results: The SI, SNR and CNR of PV were significantly higher than those of 20ml group (P <0.05, P <0.01, P <0.05) with 30ml GdDTPA. PV development effect is similar (P> 0.05). Compared with the 20ml group, the quantitative analysis result and the display effect of HV and IVC in the 30ml group were similar (P> 0.05), whether in the original image or the MIP image. Conclusions: When doing 3DDCEMRA for slow enhancement of PV, HV, and IVC, it is not necessary to increase the contrast dose from 20ml to 30ml