Capillary phase in angiography

The capillary phase is discussed on the basis of primary serial magnification and subtraction. It is suggested that the term 'intermediate phase' better expresses the angiographic appearance in between the arterial and venous phases than the term 'capillary phase'. The intermediate phase is further divided into the precapillary, capillary and postcapillary subphases and anatomic correlations are discussed. Some physiologic and pathologic aspects of the intermediate phase are considered.