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Published on: February 6, 2019
Standard and nonstandard craniospinal radiotherapy using helical TomoTherapy
William Parker1, Marylene Brodeur, David Roberge
1Department of Medical Physics, McGill University Health Centre, Montreal, Quebec, Canada. william@medphys.mcgill.ca
Summary
Helical TomoTherapy offers advantages for craniospinal radiotherapy, enabling precise dose delivery and improved healthy tissue sparing in complex cases like recurrent ependymoma and medulloblastoma.
Area of Science:
- Radiation Oncology
- Medical Physics
Background:
- Craniospinal radiotherapy (CSRT) is crucial for treating CNS malignancies.
- Helical TomoTherapy (HT) is an advanced radiotherapy technique.
Observation:
- Four complex CSRT cases were analyzed: recurrent myxopapillary ependymoma (MPE), recurrent medulloblastoma with prior irradiation, MPE with leptomeningeal metastases, and MPE with scoliosis.
- HT allowed for differential dosing to multiple targets and precise treatment delivery in cases with anatomical challenges.
Findings:
- Helical TomoTherapy successfully planned and delivered CSRT in all four presented cases.
- HT provides high conformality and dose homogeneity, with enhanced healthy tissue sparing.
- Daily megavoltage CT imaging ensures accurate patient positioning, reducing planning margins.
Implications:
- HT demonstrates significant advantages for complex CSRT, including precise targeting and dose modulation.
- This technique facilitates improved outcomes and reduced toxicity in patients requiring extensive spinal irradiation.
- HT's capabilities support personalized radiotherapy approaches for challenging oncological cases.
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