Complex plaques in the aortic arch on transthoracic echocardiography (TEE) can cause brain embolism. However, TEE, which is associated with a number of complications and contraindications, is not suitable for all patients. Therefore, we focused on contrast evaluation of MRI with 3D T1w black-blood TSE as an adjunct to diagnosis of complex plaques. The aim of this study is to clarify the optimal scan method for 3D T1w black-blood TSE. Our results suggest that 3D T1w black-blood TSE in the aortic arch can reduce the amount of artifact by using the optimal trigger timing by ECG-gating and navigator respiratory gating.