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Case: Normal Bone Mineral Density

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Let's look at this lung cancer screening CT

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through the perspective of measuring bone mineral density.

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I usually look at the thoracic spine

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and the sagal view, looking for degenerative changes,

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disc space nearing

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and plate osteophytes, other abnormalities,

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and importantly, the vertebral body

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heights are they preserved.

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And this patient, we have excellent bone mineral density

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visually, but I don't like to rely on my visual assessment

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as it can be impacted by the window level settings

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of the examination.

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So I'm gonna take a cursor

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and I'm gonna place it on the L one vertebral body,

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which I've done right here.

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And it measures 253 hound fill units,

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which means this patient has normal bone mineral density.

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I can verify that it is the L one vertebral body

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by counting from the ribs at the top down.

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So here's my first rib, second rib, third rib, fourth rib,

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and count downwards.

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Or I can count from the bottom up.

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A little problematic sometimes

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as the T 12 ribs may not be completely

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present in all patients.

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So counting from the bottom up is

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generally less recommended.

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Counting from the top down is better.

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And then there are automated tools

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that many PAC systems have

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that could automatically label your vertebral bodies

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for you, which make it quite easy to go straight

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to the L one vertebral body to make that measurement.

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And even if you don't have the L one vertebral body here,

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you can measure it at T 12 if your chest CT cuts off

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before you get the full L one vertebral body to make

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that assessment at the level as a substitute

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for the L one vertebral body level.

Report

Faculty

Ella A. Kazerooni, MD, MS

Professor of Radiology, Cardiothoracic Division

University of Michigan

Tags

Oncologic Imaging

Lungs

Chest

CT