RT Journal Article SR Electronic T1 Recirculation Subtraction and Left-to-Right Shunt Quantitation—Reply JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 1917 OP 1917 VO 33 IS 10 A1 Madsen, M.T. A1 Argenyi, E. A1 Preslar, J. A1 Grover-McKay, M. A1 Kirchner, P.T. YR 1992 UL http://jnm.snmjournals.org/content/33/10/1917.2.abstract AB