Technological progress in the design and construction of image intensifiers has been so rapid since their introduction by Teves (1955) and Feddema (1955) that they are already in daily use for many types of radiological examination. Though much of the pioneer work in this field was angiocardiographic (Lind, Wegelius, and Lichtenstein, 1954; Lind, Wegelius, and Boesen, 1955; Lind, Rocha, and Weg...

SINCE the description by Mbller' in 1953 of stenosis of peripheral pulmonary arteries, this congenital lesion has been recognized with increasing frequency. The lesion is of interest both from a clinical and physiologic standpoint. From the latter standpoint, there is sufficient documentation to warrant the inclusion of this congenital anomaly as one of the causes of right ventricular hypertens...