%0 Journal Article %1 Hentschel.2011 %A Hentschel, Bettina %A Oehler, Wolfgang %A Strauss, Dirk %A Ulrich, Andreas %A Malich, Ansgar %D 2011 %J Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... et al %K Aged Aged,_80_and_over Humans Image_Processing,_Computer-Assisted/methods Imaging,_Three-Dimensional/methods Lymphatic_Metastasis/pathology/radiotherapy Magnetic_Resonance_Imaging/methods Male Middle_Aged Neoplasm_Invasiveness Neoplasm_Staging Organ_Size Prostate/radiation_effects Prostatic_Neoplasms/pathology/radiotherapy Radiotherapy_Dosage Radiotherapy_Planning,_Computer-Assisted/methods Radiotherapy,_Intensity-Modulated/methods Seminal_Vesicles/radiation_effects Tomography,_X-Ray_Computed/methods Tumor_Burden %N 3 %P 183–190 %T Definition of the CTV prostate in CT and MRI by using CT-MRI image fusion in IMRT planning for prostate cancer %V 187 %X PURPOSE\r\nTo determine the prostate volumes defined by using MRI and CT scans, as well as the difference between prostate delineation in MRI and CT in three dimensions (3D). A further goal was to use MRI to identify subgroups of patients in whom seminal vesicle irradiation can be avoided.\r\nMETHODS AND MATERIALS\r\nA total of 294 patients with biopsy-proven prostate cancer (MRI stages: T(1), 16 5\%; T(2), 84 29\%; T(3), 191 65\%; T(4), 3 1\%) underwent pelvic CT and MRI scans before intensity-modulated radiation therapy (IMRT) planning. 3D images were used to compare the prostate volumes defined by superimposed MR and CT images. Prostate volumes were calculated in cm(3).\r\nRESULTS\r\nThe mean prostate volume defined by MRI (44.3 cm(3) range, 8.8-182.8 cm(3)) was 35\% smaller than that defined by CT (68.5 cm(3) range, 15.2-241.3 cm(3)). The areas of nonagreement were observed predominantly in the most superior and inferior portions of the prostate. The incidence of seminal vesicle invasion (SVI) identified by MRI was 63\% (n = 182 of 290). The median length of SVI was 2.6 cm (range, 1.1-4.7 cm; 62\% of the median SV length). The low-risk patients (59\%, n = 171 of 290) calculated by applying the Roach and Diaz formula had a SVI rate of 57\% (n = 97 of 171), the high-risk patients (41\%, n = 119 of 290) of 71\% (n = 85 of 119).\r\nCONCLUSIONS\r\nCompared with MRI, CT scans overestimate prostate volume by 35\%. CT-MRI image fusion-based treatment planning allows more accurate prediction of the correct staging and more precise target volume identification in prostate cancer patients.

@article{Hentschel.2011, abstract = {PURPOSE\r\nTo determine the prostate volumes defined by using MRI and CT scans, as well as the difference between prostate delineation in MRI and CT in three dimensions (3D). A further goal was to use MRI to identify subgroups of patients in whom seminal vesicle irradiation can be avoided.\r\nMETHODS AND MATERIALS\r\nA total of 294 patients with biopsy-proven prostate cancer (MRI stages: T(1), 16 [5\%]; T(2), 84 [29\%]; T(3), 191 [65\%]; T(4), 3 [1\%]) underwent pelvic CT and MRI scans before intensity-modulated radiation therapy (IMRT) planning. 3D images were used to compare the prostate volumes defined by superimposed MR and CT images. Prostate volumes were calculated in cm(3).\r\nRESULTS\r\nThe mean prostate volume defined by MRI (44.3 cm(3) [range, 8.8-182.8 cm(3)]) was 35\% smaller than that defined by CT (68.5 cm(3) [range, 15.2-241.3 cm(3)]). The areas of nonagreement were observed predominantly in the most superior and inferior portions of the prostate. The incidence of seminal vesicle invasion (SVI) identified by MRI was 63\% (n = 182 of 290). The median length of SVI was 2.6 cm (range, 1.1-4.7 cm; 62\% of the median SV length). The low-risk patients (59\%, n = 171 of 290) calculated by applying the Roach and Diaz formula had a SVI rate of 57\% (n = 97 of 171), the high-risk patients (41\%, n = 119 of 290) of 71\% (n = 85 of 119).\r\nCONCLUSIONS\r\nCompared with MRI, CT scans overestimate prostate volume by 35\%. CT-MRI image fusion-based treatment planning allows more accurate prediction of the correct staging and more precise target volume identification in prostate cancer patients.}, added-at = {2014-10-14T15:28:01.000+0200}, author = {Hentschel, Bettina and Oehler, Wolfgang and Strauss, Dirk and Ulrich, Andreas and Malich, Ansgar}, biburl = {https://www.bibsonomy.org/bibtex/2cd1e9c270fde2b82a8a95a088d143098/drtester}, interhash = {aa6cce6d85f0cf7ddc36f0bf6843831e}, intrahash = {cd1e9c270fde2b82a8a95a088d143098}, journal = {Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... [et al]}, keywords = {Aged Aged,_80_and_over Humans Image_Processing,_Computer-Assisted/methods Imaging,_Three-Dimensional/methods Lymphatic_Metastasis/pathology/radiotherapy Magnetic_Resonance_Imaging/methods Male Middle_Aged Neoplasm_Invasiveness Neoplasm_Staging Organ_Size Prostate/radiation_effects Prostatic_Neoplasms/pathology/radiotherapy Radiotherapy_Dosage Radiotherapy_Planning,_Computer-Assisted/methods Radiotherapy,_Intensity-Modulated/methods Seminal_Vesicles/radiation_effects Tomography,_X-Ray_Computed/methods Tumor_Burden}, number = 3, pages = {183–190}, timestamp = {2014-10-14T15:28:01.000+0200}, title = {Definition of the CTV prostate in CT and MRI by using CT-MRI image fusion in IMRT planning for prostate cancer}, volume = 187, year = 2011 }