The Capabilities and Characteristics of Helical Tomotherapy and Co-Planar Dual Arcs Volumetric-Modulated arc Therapy Associated with Hippocampal Sparing During Prophylactic Cranial Irradiation.
Technol Cancer Res Treat
; 20: 15330338211043975, 2021.
Article
em En
| MEDLINE
| ID: mdl-34632869
ABSTRACT
Objective:
To investigate the features of helical tomotherapy and co-planar dual Arcs volumetric-modulated arc therapy during prophylactic cranial irradiation associated with bilateral hippocampal tissue sparing. Materials andmethods:
Helical tomotherapy and co-planar dual arcs volumetric-modulated arc therapy treatment plans were generated with a dose of 30â Gy/10 fractions in 16 patients treated with prophylactic cranial irradiation. The dose to the bilateral hippocampal tissues, organs at risk, and planning target volume were determined when the average dose of bilateral hippocampal tissues was reduced by approximately 4â Gy as an observation point. Changes in dosimetry when sparing the bilateral hippocampal tissues were determined for both modalities.Results:
When bilateral hippocampal tissues were restricted to 8â Gy, D40%mean-bilateral hippocampal tissues = 7.64 ± 0.41â Gy in helical tomotherapy, while D40%mean-bilateral hippocampal tissues = 10.96 ± 0.38â Gy in co-planar dual arcs volumetric-modulated arc therapy volumetric-modulated arc therapy. Helical tomotherapy was associated with significantly lower doses to organs at risk, including Dmean-bilateral hippocampal tissues (P = .03), D98%-bilateral hippocampal tissues (P = .01), D2%-bilateral hippocampal tissues (P = .01), Dmean-inner ear (P = .02), Dmean-parotid glands (P = .02), Dmax-lens (P = .02), and Dmax-brainstem (P = .02), but not Dmax-optic nerves (P = .87). Helical tomotherapy provided better target coverage, with lower average D2%-PTV (P = .02), higher average D98%-PTV (P = .02), and better conformal index (0.87 vs 0.84, P = .02) and homogeneity index (0.15 vs 0.21, P = .05). With smaller bilateral hippocampal tissues doses, the planning target volume dose changed across 3 dosimetry regions for both modalities; the plateau region (>20.0â Gy for helical tomotherapy versus >16.0â Gy for co-planar dual arcs volumetric-modulated arc therapy), gradient region (20.0-12.0â Gy vs 16.0-11.0â Gy), and falling region (<12.0â Gy vs <11.0â Gy). The average delivery duration of helical tomotherapy was almost 7.7 times longer than that of co-planar dual arcs volumetric-modulated arc therapy.Conclusions:
Helical tomotherapy was better at sparing the bilateral hippocampal tissues and organs at risk and had better target coverage but a significantly longer treatment duration than co-planar dual arcs volumetric-modulated arc therapy. Further dose decreases in the bilateral hippocampal tissues would yield worse target dose coverage.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias Encefálicas
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Radioterapia de Intensidade Modulada
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Tratamentos com Preservação do Órgão
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Hipocampo
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article