Megavoltage CT image reconstruction during tomotherapy treatments

Ruchala, K; Olivera, G.; Kapatoes, Jeff; Schloesser, E A; Reckwerdt, Paul; Mackie, T

doi:10.1088/0031-9155/45/12/303

Cited by 106 publications

(60 citation statements)

References 33 publications

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“…11,12 The scans were reconstructed with the pixel matrix of 512 × 512 for both modalities. 13 The next step included manual delineations of the structures on KVCT and MVCT scans performed in Eclipse Treatment Planning System (ver. 10.0, Varian Medical Systems) in the "Contouring" mode.…”

Section: Methodsmentioning

confidence: 99%

Influence of the type of imaging on the delineation process during the treatment planning

Jackowiak

Bąk

Kowalik

et al. 2015

Reports of Practical Oncology & Radiotherapy

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a b s t r a c tAim: The aim of this study was to compare the intra-and interobserver contouring variability for structures with density of organ at risk in two types of tomography: kilovoltage computed tomography (KVCT) versus megavoltage computed tomography (MVCT). The intraand interobserver differences were examined on both types of tomography for structures which simulate human tissue or organs. Materials and methods:Six structures with density of the liver, bone, trachea, lung, soft tissue and muscle were created and used. For the measurements, the special water phantom with all structures was designed. To evaluate interobserver variability, five observers delineated the structures in both types of computed tomography (CT).Results: Intraobserver variability was in the range of 1-14% and was the largest for the liver. (51.86 vs. 67.97), the volume on MVCT was smaller than KVCT. The statistically significant differences between observers were observed for structures with density of the liver, bone and soft tissue on KVCT and for the liver, lung and soft tissue on MVCT. For the structures with density of the trachea and muscles, there were no significant differences for both types of tomography.Conclusions: During the contouring process the interobserver and intraobserver contouring uncertainty was larger on MVCT, especially for structures with HU near 80, compared with KVCT.

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Section: Methodsmentioning

confidence: 99%

Influence of the type of imaging on the delineation process during the treatment planning

Jackowiak

Bąk

Kowalik

et al. 2015

Reports of Practical Oncology & Radiotherapy

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“…Las señales detectadas en el proceso de verificación de la dosis administrada son de gran utilidad para conocer la cantidad de radiación incidente en el paciente 13,14 , y, combinada con la tomoimagen realizada durante el tratamiento proporciona una importante información que tiene que ver con la reconstrucción de la dosis 15 . En una situación ideal, si la anatomía del paciente no cambia, los parámetros de colocación e inmovilización del paciente no varían y la radiación generada en el Acelerador Lineal es correcta, la reconstrucción de la dosis no sería necesaria; sin embargo, en condiciones clínicas, la reconstrucción de la dosis es de gran utilidad para determinar la dosis realmente administrada y compararla con la dosis planificada.…”

Section: Tomoterapia: Radioterapia Adaptadaunclassified

Tomoterapia helicoidal: IMRT adaptada guiada por imagen

Urbina¹,

Delgado²

2005

Oncología (Barc.)

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ResumenEl Tomo-Therapy HI-ART es un nuevo sistema de radioterapia que integra la planificación del tratamiento, la verificación de la posición del paciente, del target y de los órganos a riesgo (OAR) y la ejecución de la administración de la radiación. Mediante un colimador multiláminas binario es posible modular la intensidad de un haz de radiación helicoidal, rotatorio y continuo, generado en un Acelerador Lineal instalado en un gantry de morfología anular, obteniendo altos índices de conformabilidad en el target, distribuciones de dosis homogéneas y altos gradientes dosimétricos, optimizando el rango terapéutico.Además, proporciona imágenes volumétricas de TAC (tomoimagen) de los volúmenes de interés (target, OAR) inmediatamente antes del tratamiento, permitiendo en tiempo real certificar la posición del paciente, precisar con exactitud la localización del target y de los OAR, y adaptar el tratamiento de radioterapia de acuerdo a las posibles modificaciones que ocurren durante el tiempo de tratamiento en la morfología, tamaño y movilidad del tumor.En conclusión, Tomo-Therapy HI-ART integra en una única unidad funcional tratamiento e imagen utilizando un Acelerador Lineal instalado en un gantry anular helicoidal, siendo una modalidad de alta precisión de radioterapia de intensidad modulada (IMRT) guiada por imagen tomográfica.

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“…Using a MVCT at the time of treatment, [17][18][19][20] the RP and DPD values were computed for both the simulated prostate and canine nasopharyngeal deliveries ͑Sec. III D͒.…”

Section: Accessing the Databasementioning

confidence: 99%

“…This integration of equipment on a single gantry allows for a host of verification processes. Specifically, patient registration in projection space, 14,15 delivery modification without the need for reoptimization, 16 megavoltage CT imaging ͑MVCT͒, [17][18][19][20] DV, 1,2,7 and DR 4,7-10 will be possible. The transfer matrix approach to DV and DR described previously are verification techniques for general radiotherapy and dynamic intensity modulated radiation therapy as well as tomotherapy: In principle the processes and that described in this manuscript can be used for other delivery strategies ͑e.g., those using dynamic MLCs͒.…”

Section: Introductionmentioning

confidence: 99%

“…These values are obtained for each projection from a CT of the patient/phantom in the treatment position. [17][18][19][20]43 The consequences of not having a CT that accurately represents the patient/phantom in treatment position are discussed elsewhere. [44][45][46] It will be shown that this database approach to DV provides results that are nearly identical to those with a measured matrix, which in principle is the most accurate technique and is thus used as a benchmark.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A feasible method for clinical delivery verification and dose reconstruction in tomotherapy

et al. 2001

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Delivery verification is the process in which the energy fluence delivered during a treatment is verified. This verified energy fluence can be used in conjunction with an image in the treatment position to reconstruct the full three-dimensional dose deposited. A method for delivery verification that utilizes a measured database of detector signal is described in this work. This database is a function of two parameters, radiological path-length and detector-to-phantom distance, both of which are computed from a CT image taken at the time of delivery. Such a database was generated and used to perform delivery verification and dose reconstruction. Two experiments were conducted: a simulated prostate delivery on an inhomogeneous abdominal phantom, and a nasopharyngeal delivery on a dog cadaver. For both cases, it was found that the verified fluence and dose results using the database approach agreed very well with those using previously developed and proven techniques. Delivery verification with a measured database and CT image at the time of treatment is an accurate procedure for tomotherapy. The database eliminates the need for any patient-specific, pre-or post-treatment measurements. Moreover, such an approach creates an opportunity for accurate, real-time delivery verification and dose reconstruction given fast image reconstruction and dose computation tools.

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Megavoltage CT image reconstruction during tomotherapy treatments

Cited by 106 publications

References 33 publications

Influence of the type of imaging on the delineation process during the treatment planning

Influence of the type of imaging on the delineation process during the treatment planning

Tomoterapia helicoidal: IMRT adaptada guiada por imagen

A feasible method for clinical delivery verification and dose reconstruction in tomotherapy

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