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Figure 4: Planning 4DCT Scan before the treatment and QA 4DCT scan after 25 fractions (QA scan performed during the course of treatment). The orange contour in above picture is the IGTV, which was delineated on the MIP images before the treatment. The IGTV was superimposed on the QA scan by registering the QA scan to the planning scan. The QA scan showed significant reduction in the target volume (tumor shrinkage)

Figure 4: Planning 4DCT Scan before the treatment and QA 4DCT scan after 25 fractions (QA scan performed during the course of treatment). The orange contour in above picture is the IGTV, which was delineated on the MIP images before the treatment. The IGTV was superimposed on the QA scan by registering the QA scan to the planning scan. The QA scan showed significant reduction in the target volume (tumor shrinkage)