Optimization and quality assurance of an image-guided radiation therapy system for intensity-modulated radiation therapy radiotherapy

Tsai, Jason Sheng‐Hong; Micaily, Bizhan; Miyamoto, Curtis

doi:10.1016/j.meddos.2011.11.006

Cited by 5 publications

(3 citation statements)

References 29 publications

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Section: Introductionmentioning

confidence: 99%

“…Image‐guided radiotherapy (IGRT) has become indispensable in the field of external beam radiotherapy owing to its effectiveness in compensating for patient positioning errors. 1 , 2 Among various image guidance functionalities, cone beam computed tomography (CBCT) and magnetic resonance (MR) imaging are the mainstream image guidance functionalities in IGRT, enabling soft‐tissue matching. 3 , 4 , 5 Several investigators have demonstrated that daily soft‐tissue matching resulted in smaller planning target volume (PTV) margins, outperforming bone‐ or skin‐based matching methods.…”

Section: Introductionmentioning

confidence: 99%

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Organ‐contour‐driven auto‐matching algorithm in image‐guided radiotherapy

Kishigami,

Nakamura,

Okamoto

et al. 2023

J Applied Clin Med Phys

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PurposeThis study aimed to demonstrate the potential clinical applicability of an organ‐contour‐driven auto‐matching algorithm in image‐guided radiotherapy.MethodsThis study included eleven consecutive patients with cervical cancer who underwent radiotherapy in 23 or 25 fractions. Daily and reference magnetic resonance images were converted into mesh models. A weight‐based algorithm was implemented to optimize the distance between the mesh model vertices and surface of the reference model during the positioning process. Within the cost function, weight parameters were employed to prioritize specific organs for positioning. In this study, three scenarios with different weight parameters were prepared. The optimal translation and rotation values for the cervix and uterus were determined based on the calculated translations alone or in combination with rotations, with a rotation limit of ±3°. Subsequently, the coverage probabilities of the following two planning target volumes (PTV), an isotropic 5 mm and anisotropic margins derived from a previous study, were evaluated.ResultsThe percentage of translations exceeding 10 mm varied from 9% to 18% depending on the scenario. For small PTV sizes, more than 80% of all fractions had a coverage of 80% or higher. In contrast, for large PTV sizes, more than 90% of all fractions had a coverage of 95% or higher. The difference between the median coverage with translational positioning alone and that with both translational and rotational positioning was 1% or less.ConclusionThis algorithm facilitates quantitative positioning by utilizing a cost function that prioritizes organs for positioning. Consequently, consistent displacement values were algorithmically generated. This study also revealed that the impact of rotational corrections, limited to ±3°, on PTV coverage was minimal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Organ‐contour‐driven auto‐matching algorithm in image‐guided radiotherapy

Kishigami,

Nakamura,

Okamoto

et al. 2023

J Applied Clin Med Phys

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show abstract

“…En numerosos estudios han encontrado resultados satisfactorios al implementar IGRT en tratamientos complejos de RT, especialmente de IMRT, VMAT y SRT [102][70] [23], asociados principalmente a las correcciones realizadas en la configuración de posicionamiento del paciente durante el tratamiento. Dada la facilidad de verificación periódica en vivo, algunos casos antes limitados por las posibilidades de inmovilización del paciente como en lesiones en la espina dorsal, han podido llevarse a cabo demostrando mejoras de hasta un 90 % en la estadística de control tumoral [46].…”

Section: Implementación De La Igrt En Tratamientos Estereotácticosunclassified

Recomendaciones para la implementación de la técnica de radiocirugía estereotáctica intracraneal en centros de radioterapia

Calderón¹

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La radiocirugía estereotáctica intracraneal (SRS), es una técnica de radioterapia basada en la administración de dosis ablativas de radiación. Emplea altos gradientes, focalizados sobre un volumen blanco. La aplicación de esta técnica requiere precisión en cada una de las etapas que intervienen en el proceso de implementación y desarrollo del tratamiento. Basado en la información obtenida de un sondeo general, el 30 % de los centros de radioterapia en Colombia ofrecen SRS. Sin embargo, menos del 5 % cumplen con al menos un 90 % de los requerimientos mínimos para la práctica de radiocirugía estereotáctica, que según publicaciones recientes son indispensables para asegurar el cumplimiento total de los objetivos del tratamiento. Esto demuestra que hay una falencia en la implementación de esta técnica a nivel nacional, ó carencia en el establecimiento de protocolos por parte de las secretarias de salud, que garanticen que los centros de RT cumplan con los requisitos óptimos para el desarrollo de este tipo de procedimientos. A nivel internacional se han publicado recomendaciones acordes a los requerimientos necesarios para establecer SRS de manera apropiada y segura. Por lo tanto, este trabajo compila la información pertinente que sirva como una guía de referencia y permita evaluar los criterios mínimos para la implementación óptima de la técnica de radiocirugía intracraneal en un servicio de radioterapia, considerando el panorama nacional actual.

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Emerging Modalities in Radiation Therapy for Prostate Cancer

Miyamoto

Achary

2016

Prostate Cancer

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Optimization and quality assurance of an image-guided radiation therapy system for intensity-modulated radiation therapy radiotherapy

Cited by 5 publications

References 29 publications

Organ‐contour‐driven auto‐matching algorithm in image‐guided radiotherapy

Organ‐contour‐driven auto‐matching algorithm in image‐guided radiotherapy

Recomendaciones para la implementación de la técnica de radiocirugía estereotáctica intracraneal en centros de radioterapia

Emerging Modalities in Radiation Therapy for Prostate Cancer

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