Distortion-corrected T2 weighted MRI: a novel approach to prostate radiotherapy planning
| Autor: | Stefan A. Reinsberg, David P. Dearnaley, A. Jackson, Stephen A. Mangar, S.A. Sohaib, C. South, E M Charles-Edwards, Martin O. Leach |
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| Rok vydání: | 2007 |
| Předmět: |
Male
medicine.medical_treatment Rectum Prostate cancer Prostate medicine Humans Radiology Nuclear Medicine and imaging Aged Urinary bladder medicine.diagnostic_test business.industry Radiotherapy Planning Computer-Assisted Cancer Prostatic Neoplasms Magnetic resonance imaging Radiotherapy Dosage General Medicine Anal canal Middle Aged medicine.disease Image Enhancement Magnetic Resonance Imaging Radiation therapy medicine.anatomical_structure Radiotherapy Conformal Nuclear medicine business Tomography X-Ray Computed |
| Zdroj: | The British journal of radiology. 80(959) |
| ISSN: | 1748-880X |
| Popis: | The purpose of this study was to evaluate distortion-corrected MRI as a radiotherapy planning tool for prostate cancer and the resultant implications for dose sparing of organs at risk. 11 men who were to be treated with radical conformal radiotherapy for localized prostate cancer had an MRI scan under radiotherapy planning conditions, which was corrected for geometric distortion. Radiotherapy plans were created for planning target volumes derived from the MRI- and CT-defined prostate. Dose volume histograms were produced for the rectum, bladder and penile bulb. The mean volume of the prostate as defined on CT and MRI was 41 cm3 and 36 cm3, respectively (p = 0.009). The predicted percentage of the rectum treated to dose levels of 45-65 Gy was significantly lower for plans delineating the prostate with MRI than for those with CT. The rectal-sparing effect was confined to the lowermost 4 cm of the rectum (anal canal). There were no differences between the predicted doses to bladder or penile bulb (as defined using MRI) between plans. In conclusion, prostate radiotherapy planning based on distortion-corrected MRI is feasible and results in a smaller target volume than does CT. This leads to a lower predicted proportion of the rectum, in particular the lower rectum (anal canal), treated to a given dose than with CT. |
| Databáze: | OpenAIRE |
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