title: Clinical implementation of tangential field intensity modulated radiation therapy (IMRT) using sliding window technique and dosimetric comparison with 3D conformal therapy (3DCRT) in breast cancer.
abstract: The purpose of this study was to evaluate the clinical implementation of tangential field IMRT using sliding window technique and to compare dosimetric parameters with 3-dimensional conformal radiation therapy (3DCRT). Twenty breast cancer patients were randomly selected for comparison of intensity modulated radiation therapy (IMRT)-based treatment plan with 3DCRT. Inverse treatment was performed using the sliding window technique, employing the Eclipse Planning System (version 7.1.59, Varian, Palo Alto, CA). The dosimetric parameters compared were V(95) (the percentage of target volume getting > or =95% of prescribed dose), V(105), V(110), and dose homogeneity index, DHI (percentage of target volume getting between 95% and 110% of prescribed dose). The mean V(95), DHI, V(105), and V(110) for target volume for IMRT vs. 3D were 90.6% (standard deviation [SD]: 3.2) vs. 91% (SD: 3.0), 87.7 (SD: 6.0) vs. 82.6 (SD: 7.8), 27.3% (SD: 20.3) vs. 49.4% (SD: 14.3), and 2.8 (SD: 5.6) vs. 8.4% (SD: 7.4), respectively. DHI was increased by 6.3% with IMRT compared to 3DCRT (p < 0.05). The reductions of V(105) and V(110) for the IMRT compared to 3DCRT were 44.7% and 66.3%, respectively (p < 0.01). The mean dose and V(30) for heart with IMRT were 2.3 (SD: 1.1) and 1.05 (SD: 1.5) respectively, which was a reduction by 6.8% and 7.9%, respectively, in comparison with 3D. Similarly, the mean dose and V(20) for the ipsilateral lung and the percentage of volume of contralateral volume lung receiving > 5% of prescribed dose with IMRT were reduced by 9.9%, 2.2%, and 35%, respectively. The mean of total monitor units used for IMRT and 3DCRT was about the same (397 vs. 387). The tangential field IMRT for intact breast using sliding window technique was successfully implemented in the clinic. We have now treated more than 1000 breast cancer patients with this technique. The dosimetric data suggest improved dose homogeneity in the breast and reduction in the dose to lung and heart for IMRT treatments, which may be of clinical value in potentially contributing to improved cosmetic results and reduced late treatment-related toxicity.
authors.affiliation: Department of Radiation Oncology, University of Pittsburgh Cancer Institute, Pittsburgh, PA 15237-6913, USA. selvarajrn@upmc.edu
authors.forename: Raj N
authors.initials: RN
authors.lastname: Selvaraj
authors.forename: Sushil
authors.initials: S
authors.lastname: Beriwal
authors.forename: Roya J
authors.initials: RJ
authors.lastname: Pourarian
authors.forename: Ron J
authors.initials: RJ
authors.lastname: Lalonde
authors.forename: Alex
authors.initials: A
authors.lastname: Chen
authors.forename: Kiran
authors.initials: K
authors.lastname: Mehta
authors.forename: Gwendolyn
authors.initials: G
authors.lastname: Brunner
authors.forename: Kathy A
authors.initials: KA
authors.lastname: Wagner
authors.forename: Ning J
authors.initials: NJ
authors.lastname: Yue
authors.forename: Saiful M
authors.initials: SM
authors.lastname: Huq
authors.forename: Dwight E
authors.initials: DE
authors.lastname: Heron
mesh_terms: D001943:Breast Neoplasms / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D020266:Radiotherapy, Conformal / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*