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- W2034366366 abstract "To compare the dose coverage of planning and clinical target volume (PTV, CTV), and organs-at-risk (OAR) between intensity-modulated (3D-IMRT) and conventional conformal radiotherapy (3D-CRT) before and after internal organ variation in prostate cancer.We selected 10 patients with clinically significant interfraction volume changes. Patients were treated with 3D-IMRT to 80 Gy (minimum PTV dose of 76 Gy, excluding rectum). Fictitious, equivalent 3D-CRT plans (80 Gy at isocenter, with 95% isodose (76 Gy) coverage of PTV, with rectal blocking above 76 Gy) were generated using the same planning CT data set (“CT planning”). The plans were then also applied to a verification CT scan (“CT verify”) obtained at a different moment. PTV, CTV, and OAR dose coverage were compared using non-parametric tests statistics for V95, V90 (% of the volume receiving ⩾95 or 90% of the dose) and D50 (dose to 50% of the volume).Mean V95 of the PTV for “CT planning” was 94.3% (range, 88–99) vs 89.1% (range, 84–94.5) for 3D-IMRT and 3D-CRT (p = 0.005), respectively. Mean V95 of the CTV for “CT verify” was 97% for both 3D-IMRT and 3D-CRT. Mean D50 of the rectum for “CT planning” was 26.8 Gy (range, 22–35) vs 43.5 Gy (range, 33.5–50.5) for 3D-IMRT and 3D-CRT (p = 0.0002), respectively. For “CT verify”, this D50 was 31.1 Gy (range, 16.5–44) vs 44.2 Gy (range, 34–55) for 3D-IMRT and 3D-CRT (p = 0.006), respectively. V95 of the rectum was 0% for both plans for “CT planning”, and 2.3% (3D-IMRT) vs 2.1% (3D-CRT) for “CT verify” (p = non-sig.).Dose coverage of the PTV and OAR was better with 3D-IMRT for each patient and remained so after internal volume changes." @default.
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- W2034366366 date "2007-09-01" @default.
- W2034366366 modified "2023-09-25" @default.
- W2034366366 title "4060 POSTER Annual ibandronic acid to prevent gonadotropin included bone loss in men with prostate cancer" @default.
- W2034366366 doi "https://doi.org/10.1016/s1359-6349(07)71127-8" @default.
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