PT - JOURNAL ARTICLE AU - Cowan, Robert J. AU - Williams, Rodney C. AU - Ball, James D. AU - Phillips, David C. AU - Sievers, Carole C. TI - Letter To The Editor: Dacryocystography: Incompatibility of the “Reversed Pinhole Insert” in Some Collimator Designs DP - 1989 Mar 01 TA - Journal of Nuclear Medicine Technology PG - 44--45 VI - 17 IP - 1 4099 - http://tech.snmjournals.org/content/17/1/44.short 4100 - http://tech.snmjournals.org/content/17/1/44.full SO - J. Nucl. Med. Technol.1989 Mar 01; 17