- Effect of magnetic susceptibility contrast medium on myocardial signal intensity with fast gradient-recalled echo and spin-echo MR imaging: initial experience in humans. Sakuma, H., O'Sullivan, M., Lucas, J., Wendland, M.F., Saeed, M., Dulce, M.C., Watson, A., Bleyl, K.L., LaFrance, N.D., Higgins, C.B. Radiology. (1994)