Gamma camera collimator considerations for imaging 123I.

Abstract

Line-spread functions and energy spectra for commercially produced 123I were obtained on an Anger scintillation camera using three different collimators. Images of a thyroid phantom were also obtained using the same collimators. Although the 529-keV gamma ray of 123I has a relative intensity of only about 1%, it and other high-energy but low-abundance gamma rays seriously degrade images by virtue of septum penetration through thin-wall collimators. Use of the pinhole collimator minimizes this problem.