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Objective: Computed Tomography (CT) has an important role to detect lunglesion related to Covide 19. The purpose of this work is to obtain diagnosticfindings of Ultra-Low Dose (ULD) chest CT image and compare with routine dosechest CT. Material and Methods: Patients, suspected of Covid 19 infection, werescanned successively with routine dose, and ULD, with 98% or 94% dosereduction, protocols. Axial images of routine and ULD chest CT were evaluatedobjectively by two expert radiologists and quantitatively by Signal to NoiseRatio (SNR) and pixel by pixel noise measurement. Results: It was observed thatthe ULD and routine dose chest CT images could detect Covid 19 related lunglesions in patients with PCR positive test. Also, SNR and pixel noise valueswere comparable in these protocols. Conclusion: ULD chest CT with 98% dosereduction can be used in non-pandemic situation as a substitute for chestradiograph for screening and follow up. Routine chest CT protocol can bereplaced by ULD, with 94% dose reduction, to detect patients suspected withCovid 19 at an early stage and for its follow up.

Evaluation of Ultra Low Dose chest CT imaging for Covid 19 diagnosis and follow up