Case 23: Simulating a Chest X-ray on CT Scan To Compare with Prior X-rays using “Mean” Projection

This is a 60-years old, 40-pack years history smoker with a spiculated complex lesion in the right upper lobe. The question was, whether this was a post-infectious lesion or a Lung-Rads 4A lesion that needed to be worked up.

There were earlier radiographs from 2015 and 2016 that showed a subtle right upper lobe / zone lesion unchanged from the recent 2021 radiograph. I used the "mean" projection method to approximate a radiograph from the soft tissue CT scan volume to gain more confidence about what this lesion actually was.

The video explains more.

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