The Evaluation of Metal Artifacts Reduction using Mixed Variable Thresholding Method on Cone Beam Computed Tomography Images for Head and Neck Cancer Radiotherapy

Authors

  • Nataporn Buakaew Medical Physics Program, Faculty of Allied Health Sciences, Naresuan University
  • Kittipol Dachaworakul Medical Physics Program, Faculty of Medicine and Public Health, HRH Princess Chulabhorn College of Medical Science, Chulabhorn Royal Academy
  • Titipong Kaewlek Faculty of Allied Health Sciences, Naresuan University

Keywords:

metal artifacts reduction, dental filling, implants, cone-beam computed tomography

Abstract

Background: Cone beam computed tomography (CBCT) images in head and neck region of patient with metal component of dental fillings or implants has metal artifacts which degrading image quality. Recently, there are several methods to reduce these metal artifacts. Programming algorithms of Mixed Variable Thresholding (MixVT) method is one of those methods.

Objective: To evaluate results of metal artifacts reduction using MixVT method in CBCT images with metal artifacts of head and neck region.

Materials and methods: MixVT method was applied to CBCT images of the head and neck phantom, which had a single metal screw and two metal screws, and 4 patients with metal artifacts. The results of metal artifact reduction were evaluated by comparing of the percent noise change in the areas of hyperdense, hypodense and no artifacts, as well as the line profile between initial and artifact-reduced images.

Results: The artifact-reduced images had better image quality than the initial one. The percent noise change both in the areas of hypodense and hyperdense artifacts were higher than in the area of no artifacts, and more smoothness of the line profile than the initial images. The results were the same in all CBCT images of the phantom and the patients.

Conclusion: MixVT method can effectively reduce metal artifacts on CBCT images of the head and neck patients with metal artifacts.

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Published

2020-04-14

How to Cite

1.
Buakaew N, Dachaworakul K, Kaewlek T. The Evaluation of Metal Artifacts Reduction using Mixed Variable Thresholding Method on Cone Beam Computed Tomography Images for Head and Neck Cancer Radiotherapy. J Thai Assn of Radiat Oncol [Internet]. 2020 Apr. 14 [cited 2024 Mar. 29];26(1):R1-R12. Available from: https://he01.tci-thaijo.org/index.php/jtaro/article/view/231279

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Original articles