MRA對(duì)比劑
心血管

        三維損毀梯度回波序列非常適于采用T1WI-增強(qiáng)的MR對(duì)比劑。在細(xì)胞外MR對(duì)比劑注入前、后均可應(yīng)用三維損毀梯度回波序列。對(duì)比增強(qiáng)MRA不依賴于血液流動(dòng)來(lái)產(chǎn)生信號(hào),而是通過(guò)對(duì)比劑使血液的T1(自旋-晶格)弛豫時(shí)間降低,從而與周圍組織    （共 1161 字）     [閱讀本文] >>