The Influence of Thorax Low Dose CT Scan on the Image Quality of Different Parts and Structures

Objective:To discuss how does the thorax low dose CT scan influence the image quality of different parts and structures of thorax.Methods:Randomly selected 48 cases were performed chest CT scan with standard and low dose respectively.Aortic arch level and right lower pulmonary vein level were selected for evaluation of image quality,and the definition of distal lung blood vessel,lung lobule,mediastinum structure and soft tissue structure at back side of the chest were evaluated.Results:Thorax low dose CT scan had greater influence on the image quality of aortic arch level than that of the right lower pulmonary vein level.The influence on the distal lung blood vessel was the least, the influence on the lung lobule took the second place,and the influence on the mediastinum and soft tissue structure was the biggest.Conclusion:Thorax low dose CT scan mainly influences the image quality of the dense and solid structure of thorax,and has no notalle influence on the structure in lung,so it can be used for screening of early stage lung cancer.