RT Journal Article SR Electronic T1 LETTER TO THE EDITOR JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 54 OP 55 VO 18 IS 1 A1 Billinghurst, Mervyn W. A1 Abrams, Douglas N. A1 Coutts, Alison D. YR 1990 UL http://tech.snmjournals.org/content/18/1/54.abstract AB