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. Author manuscript; available in PMC: 2009 Aug 6.
Published in final edited form as: Radiother Oncol. 2008 Mar 17;87(1):17–23. doi: 10.1016/j.radonc.2008.02.005

Figure 1.

Figure 1

This is a comparison of a three-dimensional conformal radiation therapy (3D-CRT) plan (A) versus an intensity-modulated radiation therapy (IMRT) plan (B) for a 79 year old female with a T2N0M0 (stage IB) non-small cell lung cancer of the right lower lobe. The tumor was 4.7 × 3.1 cm in the right middle lobe. The patient was deemed medically inoperable was referred for definitive radiation treatment. Due to her medical co-morbidities she was also not a candidate for systemic chemotherapy. This case was ideal for IMRT due to the patient’s small lung volumes. Here are the transverse planes through the isocenter for the two plans. With 3D-CRT plan (A), the PTV D95 was approximately 58 Gy with a NTCP of 21%. With the IMRT plan (B), the PTV D95 was 64.5 Gy (the prescription dose was 66 Gy) and NTCP was 25%. In the images, the green heavy contour is the PTV and the magenta heavy contour is the GTV. The patient was treated to 6600 cGy with no radiation treatment-related complications. The patient has continued to have no evidence of disease for 2 years since the completion of radiation treatment.