What is the role of CT densitometry in the workup of non-small cell lung cancer (NSCLC)?

Updated: Aug 27, 2019
  • Author: Sat Sharma, MD, FRCPC; Chief Editor: Eugene C Lin, MD  more...
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CT densitometry is useful in detecting the presence and distribution of calcification and fat within solitary nodules.

CT scanning is more sensitive than chest radiography for detecting the presence of calcification. Approximately one third of indeterminate nodules found on chest radiography can be demonstrated to have calcium on CT scans. CT numbers can be obtained by placing a cursor over the lesion; a value of more than 200 HU indicates calcification.

The presence of fat, detected either from direct visualization or from CT numbers ranging from –40 to –120 HU, is diagnostic of hamartoma.

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