Surface scanning for 3D dose calculation in intraoperative electron radiation therapy

García-Vázquez, Verónica; Sesé-Lucio, Begoña; Vaquero, J.J.; Desco, Manuel; Pascau, Javier

doi:10.1186/s13014-018-1181-0

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…Combined with computer-aided design (CAD) software, simple devices, such as uniform thickness bolus or shields 14 or nose blocks, can be easily created. The design of complex devices (such as non-uniform compensators) can require the use of a treatment-planning system including a dose calculation engine, which can be achieved through the creation of pseudo-CT dataset 11,15 or where the treatment planning system supports the STL format (e.g. RayStation).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of optical 3D scanning system for radiotherapy use

Crowe

Luscombe

Maxwell

et al. 2021

J of Medical Radiation Sci

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Introduction Optical three‐dimensional scanning devices can produce geometrically accurate, high‐resolution models of patients suitable for clinical use. This article describes the use of a metrology‐grade structured light scanner for the design and production of radiotherapy medical devices and synthetic water‐equivalent computer tomography images. Methods Following commissioning of the device by scanning objects of known properties, 173 scans were performed on 26 volunteers, with observations of subjects and operators collected. Results The fit of devices produced using these scans was assessed, and a workflow for the design of complex devices using a treatment planning system was identified. Conclusions Recommendations are provided on the use of the device within a radiation oncology department.

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Section: Introductionmentioning

confidence: 99%

Evaluation of optical 3D scanning system for radiotherapy use

Crowe

Luscombe

Maxwell

et al. 2021

J of Medical Radiation Sci

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“…The acquisition of the actual IOERT scenario before irradiation, specifically the surface irregularities of the tumour bed and the applicator pose, is relevant to record the treatment administered to the patient. Surface scanning of the irradiated volume combined with the applicator pose and assuming water-equivalent tissues from the irradiation surface, as proposed in [29], might be an alternative to explore in the future. Nevertheless, including this approach in the IOERT workflow entails first addressing some practical problems.…”

Section: Discussionmentioning

confidence: 99%

Intraoperative computed tomography imaging for dose calculation in intraoperative electron radiation therapy: Initial clinical observations

et al. 2020

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In intraoperative electron radiation therapy (IOERT) the energy of the electron beam is selected under the conventional assumption of water-equivalent tissues at the applicator end. However, the treatment field can deviate from the theoretic flat irradiation surface, thus altering dose profiles. This patient-based study explored the feasibility of acquiring intraoperative computed tomography (CT) studies for calculating three-dimensional dose distributions with two factors not included in the conventional assumption, namely the air gap from the applicator end to the irradiation surface and tissue heterogeneity. In addition, dose distributions under the conventional assumption and from preoperative CT studies (both also updated with intraoperative data) were calculated to explore whether there are other alternatives to intraoperative CT studies that can provide similar dose distributions. The IOERT protocol was modified to incorporate the acquisition of intraoperative CT studies before radiation delivery in six patients. Three studies were not valid to calculate dose distributions due to the presence of metal artefacts. For the remaining three cases, the average gamma pass rates between the doses calculated from intraoperative CT studies and those obtained assuming water-equivalent tissues or from preoperative CT studies were 73.4% and 74.0% respectively. The agreement increased when the air gap was included in the conventional assumption (98.1%) or in the preoperative CT images (98.4%). Therefore, this factor was the one mostly influencing the dose distributions of this study. Our experience has shown

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“…This should be paralleled by appropriate capabilities of the treatment planning system: seamless import of 3D datasets (e.g., CBCT [ 29 ]), calculation of the dose distribution expected from the imaged anatomical situation and the consequent real-time adaptation of treatment plans, and possibly tools for in-vivo treatment verification. 3D datasets obtained by tomographic modalities may not be strictly necessary, however: several studies proposed the use of surface matching [ 30 ], X-ray projections, EM beacons or other surrogate signals for the task of treatment adaptation. The concept of adapting a treatment plan to the anatomical situation described in real time immediately before delivery is sometimes referred to with the term “intraplanning” [ 6 ], a capability that should be standard equipment of the next-generation treatment planning systems for IORT.…”

Section: Needs and Opportunitiesmentioning

confidence: 99%

Treatment Planning in Intraoperative Radiation Therapy (IORT): Where Should We Go?

Cavedon

Mazzarotto

2022

Cancers

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As opposed to external beam radiation therapy (EBRT), treatment planning systems (TPS) dedicated to intraoperative radiation therapy (IORT) were not subject to radical modifications in the last two decades. However, new treatment regimens such as ultrahigh dose rates and combination with multiple treatment modalities, as well as the prospected availability of dedicated in-room imaging, call for important new features in the next generation of treatment planning systems in IORT. Dosimetric accuracy should be guaranteed by means of advanced dose calculation algorithms, capable of modelling complex scattering phenomena and accounting for the non-tissue equivalent materials used to shape and compensate electron beams. Kilovoltage X-ray based IORT also presents special needs, including the correct description of extremely steep dose gradients and the accurate simulation of applicators. TPSs dedicated to IORT should also allow real-time imaging to be used for treatment adaptation at the time of irradiation. Other features implemented in TPSs should include deformable registration and capability of radiobiological planning, especially if unconventional irradiation schemes are used. Finally, patient safety requires that the multiple features be integrated in a comprehensive system in order to facilitate control of the whole process.

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Surface scanning for 3D dose calculation in intraoperative electron radiation therapy

Cited by 7 publications

References 29 publications

Evaluation of optical 3D scanning system for radiotherapy use

Evaluation of optical 3D scanning system for radiotherapy use

Intraoperative computed tomography imaging for dose calculation in intraoperative electron radiation therapy: Initial clinical observations

Treatment Planning in Intraoperative Radiation Therapy (IORT): Where Should We Go?

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