Simulation of an imaging system for internal contamination of lungs using MPA-MURA coded-aperture collimator

The nuclides inhaled during nuclear accidents usually cause internal contamination of the lungs with low activity. Although a parallel-hole imaging system, which is widely used in medical gamma cameras, has high resolution and good image quality, owing to its extremely detection efficiency, it remains difficult obtain images lung contamination. In this study, Monte Carlo method was study using MPA-MURA coded-aperture collimator. system consisted an adult male model, mosaicked, pattern-centered, anti-symmetric MURA collimator model CsI (Tl) detector model. MLEM decoding algorithm reconstruct image, complementary reduce number artifacts. full width at half maximum I-131 point source reconstructed by reached 2.51 mm, signal-to-noise ratio simplified respiratory tract (I-131) through 3.98 dB. spatial not as that imaging, efficiency PMA-MURA two orders magnitude higher than imaging. Considering activity level caused accidents, significant potential for development