Abstract
Stereotactic body radiation therapy (SBRT) is frequently used to treat stage I/II non-small-cell lung cancer. The hypofractionated nature of the delivery necessitates highly accurate tumor delineation. Four-dimensional (4D) CT imaging is normally used for the definition of tumor motion envelope in the presence of organ motion. Therefore, in addition to the conventional free-breathing (FB) CT scan, a couple of other CT images are reconstructed, including the average intensity projection (AIP) CT and the untagged slow-scan CT (SCT).
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