Relaxation enhanced angiography without contrast and triggering (REACT) is a non-contrast-enhanced angiography technique that highlights blood and suppresses the low T2 and T1 background tissues by using a combination of T2prep and inversion modules, respectively. In this work, the T2prep module is modified to effectively perform both T2prep and inversion. This eliminates the need for a separate inversion pulse. The modified sequence (iREACT) is compared with REACT through a subjective evaluation based on blood vessel delineation, muscle and fat suppression efficacy. Further an objective analysis was performed for these parameters by measuring the blood-muscle and water-fat contrast ratios. iREACT shows comparable suppression of muscle and delineation of blood vessels whereas fat suppression efficacy is reduced at tissue boundaries and the edge of larger field of views. Efficient background suppression is achieved with a reduced RF load. This is a step towards safe and easy non-contrast MR angiography.

无造影剂和触发的松弛增强血管造影 (REACT) 是一种非造影增强血管造影技术，通过分别使用 T2prep 和反转模块的组合来突出血液并抑制低 T2 和 T1 背景组织。在这项工作中，T2prep 模块被修改为有效地执行 T2prep 和反演。这消除了对单独反转脉冲的需要。通过基于血管轮廓、肌肉和脂肪抑制功效的主观评估，将修改后的序列 (iREACT) 与 REACT 进行比较。通过测量血-肌肉和水-脂肪对比度对这些参数进行了进一步的客观分析。iREACT 显示出类似的肌肉抑制和血管描绘，而脂肪抑制功效在组织边界和更大视野的边缘降低。通过减少射频负载实现有效的背景抑制。这是迈向安全和简单的非造影 MR 血管造影的一步。