MR imaging of pulmonary embolism: diagnostic accuracy of contrast-enhanced 3D MR pulmonary angiography, contrast-enhanced low-flip angle 3D GRE, and nonenhanced free-induction FISP sequences. - Kalb B; Sharma P; Tigges S; Ray GL; Kitajima HD; Costello JR; Chen Z; Martin DR (Radiology, 2012)