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Egyptian Journal of Radiology and Nuclear Medicine
Fig. 1 | Egyptian Journal of Radiology and Nuclear Medicine

Fig. 1

From: Ultra-low-dose chest CT protocol during the second wave of COVID-19 pandemic: a double-observer prospective study on 250 patients to evaluate its detection accuracy

Fig. 1

Image quality at highest and lowest SNR; measured at axial chest CT cuts/lung window (− 700:1500) within the tracheal lumen immediately above the aortic arch at standardized 0.3 cm2 ROI (SNR = mean attenuation/SD). a Low-dose CT with higher SNR in a 77-kg patient and b ultra-low-dose CT with lower SNR in a 85-kg patient; there is no significant blurring at lung image; however, mild blurring is noted at the shadow of the thoracic cage muscles

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