1 Department of Dental Medicine,Orofacial Pathologies Imaging and Biotherapies Lab, Paris Descartes University Sorbonne Paris Cité Bretonneau Hospital , Paris , France.
2 Department of Oral Diagnosis,Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba, Sao Paulo , Brazil.
Dentomaxillofac Radiol. 2018 Feb;47(3):20170285. doi: 10.1259/dmfr.20170285. Epub 2018 Jan 10.
This report aims to describe the development of age-specific phantoms for use in paediatric dentomaxillofacial radiology research. These phantoms are denoted DIMITRA paediatric skull phantoms as these have been primarily developed and validated for the DIMITRA European research project (Dentomaxillofacial paediatric imaging: an investigation towards low-dose radiation induced risks).
To create the DIMITRA paediatric phantoms, six human paediatric skulls with estimated ages ranging between 4 and 10 years- old were selected, protected with non-radiopaque tape and immersed in melted Mix-D soft tissue equivalent material, by means of a careful procedure (layer-by-layer). Mandibles were immersed separately and a Mix-D tongue model was also created. For validation purposes, the resulting paediatric phantoms were scanned using a cone-beam CT unit with different exposure parameter settings.
Preliminary images deriving from all scans were evaluated by two dentomaxillofacial radiologists, to check for air bubbles, artefacts and inhomogeneities of the Mix-D and a potential effect on the visualization of the jaw bone. Only skulls presenting perfect alignment of Mix-D surrounding the bone surfaces with adequate and realistic soft tissue thickness density were accepted.
The DIMITRA anthropomorphic phantoms can yield clinically equivalent images for optimization studies in dentomaxillofacial research. In addition, the layer-by-layer technique proved to be practical and reproducible, as long as recommendations are carefully followed.
本报告旨在描述用于儿科齿科颌面放射学研究的特定年龄组体模的开发。这些体模被称为 DIMITRA 儿科颅骨体模，因为它们主要是为 DIMITRA 欧洲研究项目（儿童齿科颌面成像：对低剂量辐射诱导风险的调查）开发和验证的。
为了创建 DIMITRA 儿科体模，选择了六个人类儿科颅骨，估计年龄在 4 至 10 岁之间，用非不透射线的胶带保护，并通过仔细的程序（逐层）浸入融化的混合软组织等效材料中。下颌骨分别浸入其中，并创建了一个混合 D 舌模型。为了验证目的，使用不同曝光参数设置的锥形束 CT 对所得儿科体模进行了扫描。
两位齿科颌面放射科医生对所有扫描产生的初步图像进行了评估，以检查空气泡、伪影和混合 D 的不均匀性，以及对颌骨可视化的潜在影响。只有呈现出混合 D 完全围绕骨表面的完美对齐、具有足够和真实软组织厚度密度的颅骨才被接受。
DIMITRA 人体模型可以为齿科颌面研究中的优化研究提供临床等效图像。此外，只要仔细遵循建议，分层技术被证明是实用且可重复的。
