Dosimetric consideration for patients with dental filling materials undergoing irradiation of oral cavity using RapidArc: challenges and solution

Mail, Noor; Albarakati, Y.; Khan, Mubashra; Saeedi, F.; Safadi, N.; Al-Ghamdi, Suliman; Saoudi, A.

doi:10.1117/12.911895

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…The presence of the DFM and its effect on dose calculation in RapidArc treatment planning was assessed in a phantom-based study by Mail et al (2012). They reported percent depth dose (PDD) data in the site of DFM measured with Gafchromic EBT2 film and a parallel-plate (PP) ion chamber.…”

Section: Ct Artifacts From Dental Implantsmentioning

confidence: 99%

Metal artifacts in computed tomography for radiation therapy planning: dosimetric effects and impact of metal artifact reduction

et al. 2017

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A significant and increasing number of patients receiving radiation therapy present with metal objects close to, or even within, the treatment area, resulting in artifacts in computed tomography (CT) imaging, which is the most commonly used imaging method for treatment planning in radiation therapy. In the presence of metal implants, such as dental fillings in treatment of head-and-neck tumors, spinal stabilization implants in spinal or paraspinal treatment or hip replacements in prostate cancer treatments, the extreme photon absorption by the metal object leads to prominent image artifacts. Although current CT scanners include a series of correction steps for beam hardening, scattered radiation and noisy measurements, when metal implants exist within or close to the treatment area, these corrections do not suffice. CT metal artifacts affect negatively the treatment planning of radiation therapy either by causing difficulties to delineate the target volume or by reducing the dose calculation accuracy. Various metal artifact reduction (MAR) methods have been explored in terms of improvement of organ delineation and dose calculation in radiation therapy treatment planning, depending on the type of radiation treatment and location of the metal implant and treatment site. Including a brief description of the available CT MAR methods that have been applied in radiation therapy, this article attempts to provide a comprehensive review on the dosimetric effect of the presence of CT metal artifacts in treatment planning, as reported in the literature, and the potential improvement suggested by different MAR approaches. The impact of artifacts on the treatment planning and delivery accuracy is discussed in the context of different modalities, such as photon external beam, brachytherapy and particle therapy, as well as by type and location of metal implants.

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Section: Ct Artifacts From Dental Implantsmentioning

confidence: 99%

Metal artifacts in computed tomography for radiation therapy planning: dosimetric effects and impact of metal artifact reduction

et al. 2017

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“…Specifically, the mask improved the dose homogeneity while the virtual filter enhanced the delivered dose to the target tumor. These findings were obtained from the phantom and patient studies using RapidArc RT plans in the successive studies by Mail et al 9,10 In another dental phantom study by Maerz et al, dose distribution deviations were calculated in both IMRT and volumetric modulated arc therapy (VMAT) plans generated from metal artifact-contaminated CT images. 11 Their study also concluded that RT plans created from metal artifact-corrected CT images resulted in a significant decrease in dose perturbations for the H&N cases.…”

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confidence: 99%

An additional tilted‐scan‐based CT metal‐artifact‐reduction method for radiation therapy planning

Kim

Pua

Lee

et al. 2018

J Applied Clin Med Phys

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PurposeAs computed tomography (CT) imaging is the most commonly used modality for treatment planning in radiation therapy, metal artifacts in the planning CT images may complicate the target delineation and reduce the dose calculation accuracy. Although current CT scanners do provide certain correction steps, it is a common understanding that there is not a universal solution yet to the metal artifact reduction (MAR) in general. Particularly noting the importance of MAR for radiation treatment planning, we propose a novel MAR method in this work that recruits an additional tilted CT scan and synthesizes nearly metal‐artifact‐free CT images.MethodsThe proposed method is based on the facts that the most pronounced metal artifacts in CT images show up along the x‐ray beam direction traversing multiple metallic objects and that a tilted CT scan can provide complementary information free of such metal artifacts in the earlier scan. Although the tilted CT scan would contain its own metal artifacts in the images, the artifacts may manifest in a different fashion leaving a chance to concatenate the two CT images with the metal artifacts much suppressed. We developed an image processing technique that uses the structural similarity (SSIM) for suppressing the metal artifacts. On top of the additional scan, we proposed to use an existing MAR method for each scan if necessary to further suppress the metal artifacts.ResultsThe proposed method was validated by a simulation study using the pelvic region of an XCAT numerical phantom and also by an experimental study using the head part of the Rando phantom. The proposed method was found to effectively reduce the metal artifacts. Quantitative analyses revealed that the proposed method reduced the mean absolute percentages of the error by up to 86% and 89% in the simulation and experimental studies, respectively.ConclusionsIt was confirmed that the proposed method, using complementary information acquired from an additional tilted CT scan, can provide nearly metal‐artifact‐free images for the treatment planning.

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Dosimetric consideration for patients with dental filling materials undergoing irradiation of oral cavity using RapidArc: challenges and solution

Cited by 2 publications

References 4 publications

Metal artifacts in computed tomography for radiation therapy planning: dosimetric effects and impact of metal artifact reduction

Metal artifacts in computed tomography for radiation therapy planning: dosimetric effects and impact of metal artifact reduction

An additional tilted‐scan‐based CT metal‐artifact‐reduction method for radiation therapy planning

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