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Figure 4b. A typical example of MR studies (a-c) and cardiac catheterization (d, e) in a patient with nonstenotic sequential vein graft to the circumflex coronary artery. a, MR angiogram of the graft shows a maximal intensity projection. The plane of the flow image perpendicular to the course of the graft is indicated by an asterisk. Ao = aorta, PA = pulmonary artery, SCV = superior caval vein. The modulus and phase-flow image in middiastole (b) and the resulting baseline and stress velocity curves (c) are depicted. Morphologic and functional information of the same grafts was also obtained during cardiac catheterization by using standardized coronary angiographic techniques (d) and the intravascular Doppler flow wire (e), respectively. Both flow techniques revealed the typical biphasic velocity pattern, with main velocity during diastole. APV and DPV increased during stress.