Imaging 123I with a scintillation camera. A study of detection performance and quality factor concepts

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Abstract
Image quality, resolution and sensitivity of a scintillation camera equipped with various collimators were investigated using high purity 123I. Pulse height distributions of 123I from a thyroid phantom partly in air and partly immersed in water demonstrate the substantial septa penetration of the 440 and 529 keV .gamma. rays of 123I with high resolution collimators. Line spread functions recorded 1st with the line source in air and then in water show that the area under the wings is attributed mainly to septa penetration but with a marked contribution from scattering in water. The modulation transfer function [MTF] evaluated from the line spread functions shows a sudden drop at low frequencies for high resolution collimators due to their high degree of septa penetration. The 2 concepts of figure of merit also used are QB = Sa

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