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The value of three-dimensional radiotherapy planning in advanced carcinoma of the urinary bladder based on computed
1Department of Oncology, Copenhagen University Hospital, Rigshospitalet, Denmark.
Abstract:
Since 1987, radiotherapy planning of advanced bladder cancer T3-T4 has been based on computed tomography (CT), and since 1989 we have used a three-dimensional (3-D) planning system. The treatment plans of 110 patients referred to our department in 1989-1991 have been evaluated. The field sizes used after CT-based treatment planning were compared with the field sizes that would have been used after conventional planning alone (cystogram). The changes of the treatment plans are described. In 62 (60%) cases the treatment plans were altered because of the CT-scans, mainly as an enlargement of the fields. The field enlargements were mostly in the dorsal and caudal direction. In 10 (10%) cases the CT-scans provided diagnostic information which contra-indicated the proposed radical irradiation. The 3-D dose planning system has been of great value, especially the beams-eye view presentation which is an efficient tool for adjusting the field size.
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