EVALUATION OF PULMONARY-ARTERY ANATOMY USING MAGNETIC-RESONANCE - THEIMPORTANCE OF MULTIPLANAR AND OBLIQUE IMAGING

Pulmonary artery anatomy was studied in 36 patients (age range 12 days to 12.83 years, mean 2.9 years) with right ventricular outflow tract obstruction over a 3-year period using a 1.5 Tesla Magnetic Resonance system. Gated spin-echo sequences were obtained in each patient. Image planes used were straight and oblique transverse, oblique coronal, an d oblique sagittal. The studies were analyzed retrospectively and comp arative angiographic, surgical, and postmortem data was available in a ll cases. As previously noted with other imaging modalities, multiple views and oblique cuts were found to increase significantly the qualit y and accuracy of the information acquired. In 12 of the 15 patients w ho had axial and coronal imaging of both branch pulmonary arteries, th e pulmonary arteries were unequivocally demonstrated to at least the f irst hilar branch. However, early in our experience we missed a number of branch stenoses that developed following surgical anastomoses. The se mistakes were caused by inadequate or inappropriate slice acquisiti on. Magnetic resonance is an important technique for imaging pulmonary arteries. Careful use of the appropriate imaging planes is essential for accurate demonstration of the anatomy.