A Hybrid Approach Combining Dual-Energy and Inpainting Methods for Metal Artifact Reduction in Dentomaxillofacial CBCT: A Proof-of-Concept Phantom Study

IF 5.4 2区医学 Q3 ENGINEERING, BIOMEDICAL

Annals of Biomedical Engineering Pub Date : 2025-07-20 DOI:10.1007/s10439-025-03811-1

Dinidu Jayakody, Harshit Agrawal, Ella Räinä, Annina Sipola, Ritva Näpänkangas, Sampo Ylisiurua, Miika T. Nieminen, Mikael Brix

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引用次数: 0

Abstract

Purpose

Image inaccuracies and distortions are amplified in cone-beam computed tomography (CBCT), with beam hardening and metal artifacts being particularly pronounced, thereby complicating diagnostic interpretation. An approach, combining dual-energy CBCT based projection-domain material decomposition with virtual monochromatic imaging (VMI) technique, was leveraged to mitigate beam hardening artifacts originating from dental restorative and prosthetic materials on a diagnostic CBCT scanner in a phantom setting.

Methods

Severe artifact-causing dental restorative and prosthetic materials were identified from the literature and six of them were selected for the study. Six different phantoms were developed using selected materials, and 3D-printed cylindrical molds filled with gelatine. Three different tube voltages, such as 80 kilovoltage (kV), 100 kV, 120 kV were selected for scanning and the phantoms were scanned using a commercial CBCT scanner (Viso G7, Planmeca Oy., Helsinki, Finland). A custom-developed material decomposition algorithm, based on polychromatic projection domain modeling, was employed to separate the dual-energy data into water and iron basis materials. VMIs were then synthesized at 200 keV using the decomposed data. For comparison, the 100 kV acquisition (routine protocol) with and without the vendor’s inpainting-based MAR algorithm was used to assess VMI techniques’ performance for artifact reduction.

Results

Both subjectively and quantitatively, the VMI technique offered better image quality than the routine 100 kV protocol. Further, combining the VMI technique with an inpainting-based MAR algorithm offered superior artifact reduction (p < 0.01) for all tested materials compared to using the routine protocol and the MAR algorithm.

Conclusions

The proposed VMI + MAR technique offered superior artifact reduction compared to a commercial MAR algorithm.

查看原文本刊更多论文

结合双能量和涂漆的混合方法在牙颌面CBCT中减少金属伪影：概念验证研究。

目的：在锥形束计算机断层扫描（CBCT）中，图像不准确和失真被放大，光束硬化和金属伪影特别明显，从而使诊断解释复杂化。该方法将基于双能CBCT的投影域材料分解与虚拟单色成像（VMI）技术相结合，用于减轻虚幻环境下诊断CBCT扫描仪上牙齿修复体和假体材料产生的光束硬化伪影。方法：从文献中找出造成严重假影的牙体修复和修复材料，从中选择6种材料进行研究。使用选定的材料和填充了明胶的3d打印圆柱形模具，开发了六个不同的模型。选择80千伏、100千伏、120千伏等三种不同的管电压进行扫描，使用商用CBCT扫描仪（Viso G7、Planmeca Oy）扫描幻像。，赫尔辛基，芬兰)。采用基于多色投影域建模的自定义材料分解算法，将双能数据分离为水基和铁基材料。然后利用分解后的数据在200 keV下合成vmi。为了进行比较，使用100 kV采集（常规协议）来评估VMI技术在减少伪影方面的性能。结果：无论是主观上还是定量上，VMI技术都比常规的100kv方案提供更好的图像质量。此外，将VMI技术与基于绘画的MAR算法相结合可以提供更好的伪影减少(p)。结论：与商业MAR算法相比，提出的VMI + MAR技术可以提供更好的伪影减少。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annals of Biomedical Engineering 工程技术-工程：生物医学

CiteScore

7.50

自引率

15.80%

发文量

212

审稿时长

3 months

期刊介绍： Annals of Biomedical Engineering is an official journal of the Biomedical Engineering Society, publishing original articles in the major fields of bioengineering and biomedical engineering. The Annals is an interdisciplinary and international journal with the aim to highlight integrated approaches to the solutions of biological and biomedical problems.