Reduction of irradiated small bowel volume and accurate patient positioning by use of a bellyboard device in pelvic radiotherapy of gynecological cancer patients
| Autor: | Hetty A. van den Berg, Hans C.J. de Boer, Manouk J.J. Olofsen-van Acht, Sandra Quint, Merik Seven, Andries G. Visser, John van Soemsen de Koste, Carien L. Creutzberg |
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| Přispěvatelé: | Medical Oncology, Radiation Oncology, Pathology |
| Rok vydání: | 2001 |
| Předmět: |
medicine.medical_specialty
Supine position Genital Neoplasms Female medicine.medical_treatment Patient positioning Radiation Dosage Sensitivity and Specificity Radiation Protection SDG 3 - Good Health and Well-being Intestine Small Prone Position Humans Medicine Radiology Nuclear Medicine and imaging Radiation Injuries Experimental radiotherapy and neuro-oncology Reduction (orthopedic surgery) Aged Probability Phantoms Imaging business.industry Radiotherapy Planning Computer-Assisted Hematology Middle Aged Experimentele radiotherapie en neuro-oncologie Gynecological cancer Surgery Radiation therapy Prone position Oncology Linear Models Female Radiotherapy Adjuvant business Nuclear medicine Pelvic radiotherapy Volume (compression) |
| Zdroj: | Radiotherapy and Oncology, 59, 1, pp. 87-9-93 Radiotherapy and Oncology, 59, 87-9-93 Radiotherapy and Oncology, 59, 71-79. Elsevier Ireland Ltd |
| ISSN: | 0167-8140 |
| Popis: | Item does not contain fulltext PURPOSE: To reduce the volume of small bowel within pelvic treatment fields for gynecological cancer using a bellyboard device and to determine the accuracy of the prone treatment position. MATERIALS AND METHODS: Fifteen consecutive patients with a gynecologic malignancy who were treated with postoperative pelvic radiotherapy were selected for this study. The volume of small bowel within the treatment fields was calculated for both the supine and prone treatment positions. The patients were treated in the prone position in a so-called bellyboard device. During treatment sessions electronic portal images were obtained. An off-line setup verification and correction protocol was used and the setup accuracy of the positioning in the bellyboard was determined. RESULTS: The average volume of small bowel within the treatment fields was 229 cm(3) and 66 cm(3) in the supine and prone treatment, respectively, which means an average volume reduction in the prone position of 64% (95% CI 56-72%), as compared with the supine position. For the position of the patient in the field, the systematic error defined by the standard deviation (SD) of the mean difference per patient between simulation and treatment images was 1.7 mm in the lateral direction, 2.1 mm in the craniocaudal direction and 1.7 mm in the ventrodorsal direction. On average, only 0.4 setup correction per patient was required to achieve this accuracy. The random day-to-day variations were 1.9 (1SD), 2.6 and 2.3 mm, respectively. Standard deviations of the systematic differences between patient positioning relative to the bellyboard were 6.2 mm in lateral direction and 9.1 mm in craniocaudal direction. CONCLUSIONS: Treatment of gynecological cancer patients in the prone position using a bellyboard reduces the volume of irradiated small bowel. An off-line verification and correction protocol ensures accurate patient positioning. Daily setup variations using the bellyboard were small (1 SD |
| Databáze: | OpenAIRE |
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