MATERIALS AND METHODS

Ninety-seven patients have been studied. All had routine posteroanterior, lateral, and right anterior oblique chest films, full chest laminagrams, and ex-tensive pulmonary function tests. Twenty-five normal subjects served as con-trols. In 20 patients pulmonary angiograms and lung scans were performed. Full chest laminagraphy was performed with the patients in the supine an-teroposterior position. The focal point was at the midthoracic level (hilar areas) and at a point 2 cm posteriorly. The cone size was adjusted to include the entire frontal section of both lungs. Pulmonary angiograms were made after the injection of 60 to 70 cc. of angio-Conray utilizing the Schonander film changer. Placing an N. LH. cathe-ter tip in the right atrium was facilitated by the utilization of amplified TV fluoroscopy. Test films were taken and subsequently 2 films were made per sec. for 10 sec. starting after 1 sec. less than the patients arm-tongue circu-lation time. The factors used averaged 300 milliamperes,’lio sec. and 65 to 68 kv.