Department of Radiology, Clinical Centre University of Sarajevo, Bolnička 25. Sarajevo, 71000, Bosnia and Herzegovina.
Department of Mechanical Production Engineering, Faculty of Mechanical Engineering Sarajevo, Vilsonovo šetalište 9. Sarajevo, 71000, Bosnia and Herzegovina.
Radiography (Lond). 2022 Aug;28(3):788-792. doi: 10.1016/j.radi.2022.02.008. Epub 2022 Mar 6.
Additive production refers to the process of prototyping, which allows the production of highly complex medical devices and products. Interpretation of additive manufacturing (AM) material in Computed Tomography (CT) has not been widely investigated. The aim of this study was to determine the CT number values of commercially available fused deposition modelling (FDM) and stereolithography (SLA) AM materials.
Total of 15 AM materials, 7 FMD and 8 SLA, were selected and scanned on CT to determine the HU value and appearance on the images. All test object were designed as rectangular blocks and after their production physical description were calculated. AM materials were scanned on CT operating at 80, 100, 120 and 135 kV.
All materials correspond to a certain human tissue and they have uniformity when printed with 100% infill. CT number ranged from a minimum of -188.0 HU to a maximum of 189.1 HU, for FDM materials, and from -15.8 HU to 167.3 HU, for SLA materials.
Knowing the CT number of an AM materials can allow the design of medical or rehabilitation products with a specific appearance on CT images. Analysed and collected data can find application in the design and manufacture of immobilization devices that can be easily distinguished from other materials or human tissue.
This study provides information that can be used in the design and fabrication of anthropomorphic diagnostic and therapeutic phantoms. There is significant potential for the use of AM material for sophisticated test objects when used in medical image modality testing. Knowing actual CT numbers of frequently used AM materials allows manufacturing anthropomorphic phantoms to investigate radiation doses in diagnostic radiology and radiotherapy.
增材制造是指原型制作过程，它允许生产高度复杂的医疗设备和产品。对计算机断层扫描（CT）中添加剂制造（AM）材料的解读尚未得到广泛研究。本研究的目的是确定市售熔融沉积建模（FDM）和立体光固化（SLA）AM 材料的 CT 数。
选择了总共 15 种 AM 材料，7 种 FDM 和 8 种 SLA，并在 CT 上扫描以确定 HU 值和图像上的外观。所有测试对象均设计为矩形块，并在生产后计算其物理描述。AM 材料在 80、100、120 和 135 kV 下进行 CT 扫描。
所有材料都对应于一定的人体组织，并且当以 100%填充打印时具有均匀性。CT 数范围从 FDM 材料的最小值-188.0 HU 到最大值 189.1 HU，以及 SLA 材料的最小值-15.8 HU 到最大值 167.3 HU。
了解 AM 材料的 CT 数可以设计出在 CT 图像上具有特定外观的医疗或康复产品。分析和收集的数据可应用于设计和制造易于与其他材料或人体组织区分开来的固定装置。
本研究提供了可用于设计和制造拟人诊断和治疗体模的信息。在医学图像模态测试中，当用于复杂测试对象时，AM 材料具有很大的潜力。了解常用 AM 材料的实际 CT 数，可以制造出拟人化的体模，以研究诊断放射学和放射治疗中的辐射剂量。
