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• W4251863344 abstract "To compare rectal dose volume histograms (DVH) between stereotactic radiotherapy, intensity modulated radiation therapy (IMRT), and 3D-conformal radiotherapy (3D-CRT) for prostate cancer. Radiotherapy plans for 28 patients treated with stereotactic radiotherapy, IMRT, and 3-D CRT techniques were reviewed. There were 10 stereotactic plans, 9 IMRT plans, and 9 3D-CRT plans. The planning systems utilized were Northwest Medical Physics Equipment/pReference for the stereotactic plans and ADAC/Pinnacle for IMRT and 3D-CRT plans. Fused MRI and CT were used for target delineation with IMRT and stereotactic radiotherapy. CT alone was utilized for 3D-CRT. For patients treated with IMRT and stereotactic radiotherapy, fiducial markers were placed within the gland and utilized for daily target localization with electronic portal imaging. Patients treated with 3D-CRT were localized with skin marks. The CTV was expanded by 0.4 cm for stereotactic radiotherapy plans and 0.5 cm for IMRT plans based on accuracy of the localization technique and on previous data related to intrafraction stability. CTV expansion was 1–1.5 cm for the 3D-CRT plans. Stereotactic radiotherapy was delivered with 6 noncoplanar fields and custom stereotactic cones on the 2100CD or 2100EX Varian linac with patients lying in a flex-prone position. IMRT was delivered with 9 coplanar beams, and 3D-CRT with 6 coplanar beams. Treatment was delivered with either 0.5 cm or 1 cm MLC on a Varian 2100CD or 2100EX linear accelerator for IMRT and 3D-CRT in supine position without other immobilization. The dose to the prostate was 33.5 Gy /6 fractions for stereotactic radiotherapy plans, and 75–78 Gy/35–42 fractions for IMRT and 3D-CRT plans. The rectal volume was contoured as a solid organ from anal canal to the level of the sacro-iliac joint in all plans and reported in cubic centimeters. There were notable differences in the rectal DVH among the three treatment techniques (see table(table 1)). IMRT produced the most rectal sparing at the high dose levels but below the 80% level, stereotactic radiotherapy produced better sparing. 3D-CRT plans provided the least rectal sparing at all dose levels. In our experience, IMRT and stereotactic radiotherapy plans resulted in smaller rectal volumes exposed to high dose radiation compared to 3D-CRT plans. In addition, stereotactic radiotherapy resulted in significantly less rectal volume exposed to the lower radiation dose levels than IMRT or 3D-CRT plans. These differences may be advantageous for hypofractionated treatment regimens. This analysis helps substantiate the use of this unique stereotactic technique for our phase I/II clinical trial of hypofractionated radiation therapy for prostate cancer." @default.
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• W4251863344 date "2004-09-01" @default.
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• W4251863344 title "Comparison of rectal dose volume histograms for definitive prostate radiotherapy among stereotactic radiotherapy, IMRT, and 3D-CRT techniques" @default.
• W4251863344 doi "https://doi.org/10.1016/j.ijrobp.2004.07.651" @default.
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