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Gamma Camera Collimator Considerations for Imaging ¹²³I

Searle Analytic, Inc., and Searle Radiographics, Inc., Des Plaines, Illinois

Correspondence: For reprints contact: R. E. McKeighen, Searle Analytic Inc., Searle Radiographics Inc., 2000 Nuclear Dr., Des Plaines, Ill. 60018.

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.