Noncontrast chest CT lung window images in a 70-year-old male participant (IMAGE)

Radiological Society of North America

Noncontrast chest CT lung window images in a 70-year-old male participant

Caption

Axial noncontrast chest CT lung window images in a 70-year-old male participant. (A) Normal-dose CT, (B) ultra-low-dose CT (ULDCT), and (C) denoised ULDCT images show tree-in-bud opacities (yellow arrow). The tree-in-bud opacities can be observed on normal-dose CT image. However, due to the increased image noise at ULDCT, the linear branching pattern was missed and classified incorrectly by both readers as nodules with no tree-in-bud opacities. Denoised ULDCT allowed better appreciation of centrilobular nodules with a linear branching pattern, and the image was classified correctly as positive for tree-in-bud opacities.

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Radiological Society of North America (RSNA)

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