Table 2.

Literature review

Study	Date	Conclusion of the study
Fang et al.[17]	February 2020	In a series of 51 patients with chest CT and RT-PCR assay performed within 3 days, the sensitivity of CT for COVID-19 infection was 98% compared to RT-PCR sensitivity of 71% (p<0.001)
Feng et al.[21]	April 2020	Chest CT is more sensitive than RT-PCR to detect early change of COVID-19 in cases which RT-PCR tests show negative results. In this case, fifth RT-PCR test was positive with initial positive CT and subsequent four negative RT-PCR tests.
Long C, et al.[4]	May 2020	RT-PCR may produce initial false negative results. The authors suggest that patients with typical CT findings but negative RT-PCR results should be isolated, and RT-PCR should be repeated to avoid misdiagnosis
Ai T, et al.[19]	August 2020	The positive rates of RT-PCR assay and chest CT imaging in study cohort were 59% and 88% respectively. With RT-PCR as a reference, the sensitivity of chest CT imaging for COVID-19 was 97%. With analysis of serial RT-PCR assays and CT scans, 60% to 93% of patients had initial positive chest CT consistent with COVID-19 before the initial positive RT-PCR results.
Xie X, et al.[22]	August 2020	A combination of repeated swab tests and CT scanning may be helpful when for individuals with high clinical suspicion of nCoV infection but negative RT-PCR screening