Investigating the effect of dental implant materials with different densities on radiotherapy dose distribution using Monte-Carlo simulation and pencil beam convolution algorithm

Akyol, Oya; Dırıcan, Bahar; Toklu, Türkay; Eren, Hakan; Olğar, Turan

doi:10.1259/dmfr.20180267

Cited by 14 publications

(13 citation statements)

References 24 publications

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“…Some patients with multiple vertebral metastases who underwent spine SBRT had metal implants inserted for fixation of the vertebral bodies. It is important to evaluate the effects of these metal implants on spine SBRT, as investigated by some researchers ( 19 , 20 ). In addition, plans were not subsequently optimized based on the MC algorithm.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Ray Tracing and Monte Carlo Calculation Algorithms for Spine Lesions Treated With CyberKnife

Zhang

Pan

et al. 2022

Front. Oncol.

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PurposeThis study attempts to evaluate Ray Tracing (RT) and Monte Carlo (MC) algorithms for CyberKnife treatments of spine lesions and determine whether the MC algorithm is necessary for all spine treatment and compare the RT algorithm and MC algorithm at various spine lesion sites.MethodsThe CyberKnife is used for stereotactic body radiotherapy for lesions in the cervical spine (30), thoracic spine (50), lumbar spine (30), and sacral spine (15). Dose was calculated using RT and MC algorithms for patients planned with the same beam angles and monitor units. Dose-volume histograms of the target and selected critical structures are evaluated.ResultsThe average target coverage of prescribed dose with MC algorithms was 94.80%, 88.47%, 92.52%, and 93.41%, respectively, in cervical, thoracic, lumbar, and sacral spine. For the thoracic spine, the RT algorithm significantly overestimates the percentage volume of the target covered by the prescribed dose, as well as overestimates doses to organs at risk in most cases, including lung, spinal cord, and esophagus. For cervical, lumbar, and sacral spine, the differences of the target coverage of prescription dose were generally less than 3% between the RT and MC algorithms. The differences of doses to organs at risk varied with lesion sites and surrounding organs.ConclusionsIn the thoracic spine lesions with beams through air cavities, RT algorithm should be limited and verified with MC algorithm, but the RT algorithm is adequate for treatment of cervical, lumbar, and sacral spine lesions without or with a small amount of beams passing through the lungs.

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Section: Discussionmentioning

confidence: 99%

Comparison of Ray Tracing and Monte Carlo Calculation Algorithms for Spine Lesions Treated With CyberKnife

Zhang

Pan

et al. 2022

Front. Oncol.

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“…Some patients with multiple vertebral metastases who underwent spine SBRT had metal implants inserted for xation of the vertebral bodies. It is important to evaluate the effects of these metal implants on spine SBRT, as investigated by some researchers [19][20] . In addition, Plans were not subsequently optimized based on the MC algorithm.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Ray Tracing and Monte Carlo Calculation Algorithms for Spine Lesions Treated with CyberKnife

Li¹,

Zhang²,

Pan³

et al. 2021

Preprint

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Purpose: This study attempts to evaluate Ray Tracing (RT) and Monte Carlo (MC) algorithm for CyberKnife treatments of spine lesions and determine whether MC algorithm is necessary for all spine treatment and analyze which sites of spine lesion for which RT algorithm is comparable to MC algorithm. Methods: The CyberKnife is used for stereotactic body radiotherapy for lesions in the cervical spine (30), thoracic spine (50), lumbar spine (30) and sacral spine (15). Dose was calculated using RT and MC algorithms for patients planned with the same beam angles and monitor units. Dose-volume histograms of the target and selected critical structures are evaluated. Results: The average target coverage of prescribed dose with MC algorithms was 94.80%, 88.47%, 92.52% and 93.41% respectively in cervical, thoracic, lumbar and sacral spine. For thoracic spine, RT algorithm significantly overestimates the percentage volume of target covered by the prescribed dose, as well as overestimates doses to organs at risk in most cases, including lung, spinal cord and esophagus. For cervical, lumbar and sacral spine, the differences of the target coverage of prescription dose were generally less than 3% between the RT and MC algorithms. The differences of doses to organs at risk varied with lesion sites and surrounding organs. Conclusions: In the thoracic spine lesions with beams through air cavities, RT algorithm should be limited and verified with MC algorithm, but the RT algorithm is adequate for treatment of cervical, lumbar and sacral spine lesions without or small amount of beams passing through the lungs.

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“…However, the treatment planning can be quite challenging if the patient has dental fillings or implants. In these patients, metal artefacts may not allow proper calculation and verification of the distribution of the radiation dose, and may even lead to undetected high radiation doses in the parotid glands resulting in xerostomia (8). Verification of the dose distribution may be more appropriately performed when using a phantom.…”

Section: Discussionmentioning

confidence: 99%

“…In order to provide the optimal radiation treatment for a head-and-neck cancer patient, the patient's individual situation including his anatomy must be appropriately considered. Treatment planning and delivery become more complex if a patient has dental fillings and implants or titanium implants as part of reconstructive surgery (8). Particularly, verification of the distribution of the radiation dose, which is an important procedure of quality assurance in radiation oncology, can become very difficult.…”

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confidence: 99%

A New Phantom for Individual Verification of the Dose Distribution in Precision Radiotherapy for Head-and-Neck Cancer

et al. 2019

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Background/Aim: Many patients with head-andneck cancers receive radiotherapy. Treatment planning can be very complex in case of dental fillings or implants that cause metal artefacts. Verification of dose distributions may be performed using specific phantoms. This study aimed to develop a 3D-printed phantom that can be produced easily and cost-effectively. Patients and Methods: The phantom was designed to allow fast adaption to a patient's individual situation with a particular focus on metal artefacts due to dental fillings. Bone and soft-tissue shells were 3D-printed and filled with tissue-equivalent materials. Results: Attenuation properties of the tissue-equivalent structures in the phantom corresponded well to the structures of real human anatomy. In magnetic resonance (MR)-imaging, useful signals of the materials in the phantom were obtained. Conclusion: The phantom met the requirements including equivalence with human tissues and can be useful for highly individual treatment planning in precision-radiotherapy of head-and-neck cancers. It can be also used for scientific issues related to MR-imaging.

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Investigating the effect of dental implant materials with different densities on radiotherapy dose distribution using Monte-Carlo simulation and pencil beam convolution algorithm

Cited by 14 publications

References 24 publications

Comparison of Ray Tracing and Monte Carlo Calculation Algorithms for Spine Lesions Treated With CyberKnife

Comparison of Ray Tracing and Monte Carlo Calculation Algorithms for Spine Lesions Treated With CyberKnife

Comparison of Ray Tracing and Monte Carlo Calculation Algorithms for Spine Lesions Treated with CyberKnife

A New Phantom for Individual Verification of the Dose Distribution in Precision Radiotherapy for Head-and-Neck Cancer

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