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The results show that air trapping and TBM are correlated, both as long-term sequelae in mustard gas-exposed cases. Because air trapping is highly suggestive of bronchiolitis obliterans, we conclude that both bronchiolitis obliterans and TBM are caused by a single underlying process affecting small and large airways, respectively, in this group of patients.

A novel Positron Emission Tomography system, based on plastic scintillators, is being developed by the J-PET collaboration. In this article we present the simulation results of the scatter fraction, representing one of the parameters crucial for background studies defined in the NEMA-NU-2-2012 norm. We elaborate an event selection methods allowing to suppress events in which gamma quanta were scattered in the phantom or underwent the multiple scattering in the detector. The estimated scatter fraction for the single-layer J-PET scanner varies from 37% to 53% depending on the applied energy threshold.

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