A new strategy for craniospinal axis localization and adaptive dosimetric evaluation using cone beam CT
| Autor: | Balakrishnan Rajesh, Christopher J. Sujith, Paul B Ravindran, Ebenezer Suman Babu S, Kather Hussain Mohamathu Rafic, Peace Balasingh Timothy, B Selvamani |
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| Rok vydání: | 2019 |
| Předmět: |
Computer science
business.industry Original research article Imaging phantom Craniospinal Irradiation 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Software Oncology 030220 oncology & carcinogenesis Spatial Displacement Custom software Radiology Nuclear Medicine and imaging Anthropomorphic phantom Computer vision Artificial intelligence business Craniospinal Cone beam ct |
| Zdroj: | Rep Pract Oncol Radiother |
| ISSN: | 1507-1367 |
| Popis: | Background and Aim Computational complexities encountered in craniospinal irradiation (CSI) have been widely investigated with different planning strategies. However, localization of the entire craniospinal axis (CSA) and evaluation of adaptive treatment plans have traditionally been ignored in CSI treatment. In this study, a new strategy for CSI with comprehensive CSA localization and adaptive plan evaluation has been demonstrated using cone beam CT with extended longitudinal field-of-view (CBCTeLFOV). Materials and Methods Multi-scan CBCT images were acquired with fixed longitudinal table translations (with 1 cm cone-beam overlap) and then fused into a single DICOM-set using the custom software coded in MatLab™. A novel approach for validation of CBCTeLFOV was demonstrated by combined geometry of Catphan-504 and Catphan-604 phantoms. To simulate actual treatment scenarios, at first, the end-to-end workflow of CSI with VMAT was investigated using an anthropomorphic phantom and then applied for two patients (based on random selection). Results The fused CBCTeLFOV images were in excellent agreement with planning CT (pCT). The custom developed software effectively manages spatial misalignments arising out of the uncertainties in treatment/setup geometry. Although the structures mapped from pCT to CBCTeLFOV showed minimal variations, a maximum spatial displacement of up to 1.2 cm (and the mean of 0.8 ± 0.3 cm) was recorded in phantom study. Adaptive plan evaluation of patient paradigms showed the likelihood of under-dosing the craniospinal target. Conclusion Our protocol serves as a guide for precise localization of entire CSA and to ensure adequate dose to the large and complex targets. It can also be adapted for other complex treatment techniques such as total-marrow-irradiation and total-lymphoid-irradiation. |
| Databáze: | OpenAIRE |
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