الفهرس 
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Abstract
COVID-19, a new coronavirus disease that emerged in 2019, has become a global viral pandemic and a public health issue of global significance. Confirmed COVID-19 patients must be referred to a specific hospital, while suspected COVID-19 patients must be isolated under medical surveillance, according to COVID-19 recommendations. Larger public health surveillance and response systems with a high medical burden are required for isolated cases and isolation for those with whom they have had intimate contact. (Mahale P et al., 2020)
Chest CT can reveal a quick positive result before positive real-time fluorescence polymerase chain reaction (RT-PCR), that is the gold standard for confirming COVID-19 recently (Guan et al., 2020) but with a significant false negative rate (Xie et al., 2020) (Ai et al., 2020)
In spite of typical and atypical CT image results are reported in several papers- (Guan et al., 2020) (Kanne, 2020) (Xu et al., 2020) overlapping CT image findings with viral pneumonia and other respiratory illnesses also make an exclusion diagnosis hard. We try to develop a simple and practical method to identify cases requiring repeated times of RT-PCR to recognize highly suspected cases and highly excluded cases.
In accordance with a study from (Bai et al., 2020) in comparison with non-COVID-19 pneumonia, COVID-19 was more commonly to cause peripheral distribution, ground-glass-like shadows, fine-mesh opacity, vascular thickening, and anti-halo signs, that is clearly important for differential diagnosis (Bai et al., 2020).
Yet, because the study was directed primarily on individual empirical judgement, the results cannot be generalised. In order to construct scoring criteria for the objective and semi-quantitative differential diagnosis of COVID-19 pneumonia, we researched current literature and described our own experiences.
Aim of the work
To differentiate between covid19 pneumonia & non covid19 pneumonia using high resolution CT chest.