Calcul de dose de radiothérapie à partir de tomographies coniques : état de l’art
| Autor: | S. Couespel, Caroline Lafond, R. de Crevoisier, O. Henry, Antoine Simon, A. Barateau, Oscar Acosta, N. Perichon, M. Céleste |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Cone beam computed tomography Dose calculation business.industry medicine.medical_treatment Context (language use) 030218 nuclear medicine & medical imaging Dose planning Radiation therapy 03 medical and health sciences 0302 clinical medicine Oncology 030220 oncology & carcinogenesis Hounsfield scale medicine Radiology Nuclear Medicine and imaging External beam radiotherapy Nuclear medicine business Cone beam ct |
| Zdroj: | Cancer/Radiothérapie. 22:85-100 |
| ISSN: | 1278-3218 |
| DOI: | 10.1016/j.canrad.2017.07.050 |
| Popis: | In external beam radiotherapy, the dose planning is currently based on computed tomography (CT) images. A relation between Hounsfield numbers and electron densities (or mass densities) is necessary for dose calculation taking heterogeneities into account. In image-guided radiotherapy process, the cone beam CT is classically used for tissue visualization and registration. Cone beam CT for dose calculation is also attractive in dose reporting/monitoring perspectives and particularly in a context of dose-guided adaptive radiotherapy. The accuracy of cone beam CT-based dose calculation is limited by image characteristics such as quality, Hounsfield numbers consistency and restrictive sizes of volume acquisition. The analysis of the literature identifies three kinds of strategies for cone beam CT-based dose calculation: establishment of Hounsfield numbers versus densities curves, density override to regions of interest, and deformable registration between CT and cone beam CT images. Literature results show that discrepancies between the reference CT-based dose calculation and the cone beam CT-based dose calculation are often lower than 3%, regardless of the method. However, they can also reach 10% with unsuitable method. Even if the accuracy of the cone beam CT-based dose calculation is independent of the method, some strategies are promising but need improvements in the automating process for a routine implementation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect