RT Journal Article SR Electronic T1 Volume-Dependent Pulmonary Aspiration of a Swallowed Radionuclide Bolus JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 103 OP 104 VO 38 IS 1 A1 Heyman, Sydney YR 1997 UL http://jnm.snmjournals.org/content/38/1/103.abstract AB