MR imaging of pulmonary emboli: an experimental study in dogs.

摘要: Experimental pulmonary emboli, consisting of tantalum-labeled autologous blood clots and barium-labeled 3-mm plastic spheres that did not produce an MR signal, were introduced through the femoral vein into each five dogs. The sensitivity to detect known size was assessed, clot on compared with its actual size. Emboli localized by using chest radiographs made in multiple projections. Cardiac-synchronized imaging performed a 0.35-T superconducting magnet followed 99mTc macroaggregated lung scan. All 12 larger than 3 mm, three 20 less mm transverse diameter correctly visualized MR. Five 15 seen 150% There nine false-positive emboli Two six resulted abnormal signal from results thrombus itself probably also slow flow proximal obstruction. may be value detecting emboli; clinical trials evaluate usefulness should carried out.