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A Novel Design of N-Fiducial Phantom for Automatic Ultrasound Calibration

BACKGROUND: Freehand ultrasound (US) is a technique used to acquire three-dimensional (3D) US images using a tracked 2D US probe. Calibrating the probe with a proper calibration phantom improves the precision of the technique and allows several applications in computer-assisted surgery. N-fiducial p...

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Autores principales: Chatrasingh, Maria, Suthakorn, Jackrit
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Wolters Kluwer - Medknow 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6764176/
https://www.ncbi.nlm.nih.gov/pubmed/31576067
http://dx.doi.org/10.4103/jmp.JMP_92_18
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author Chatrasingh, Maria
Suthakorn, Jackrit
author_facet Chatrasingh, Maria
Suthakorn, Jackrit
author_sort Chatrasingh, Maria
collection PubMed
description BACKGROUND: Freehand ultrasound (US) is a technique used to acquire three-dimensional (3D) US images using a tracked 2D US probe. Calibrating the probe with a proper calibration phantom improves the precision of the technique and allows several applications in computer-assisted surgery. N-fiducial phantom is widely used due to the robustness of precise fabrication and convenience of use. In principle, the design supports single-frame calibration by providing at least three noncollinear points in 3D space at once. Due to this requirement, most designs contain multiple N-fiducials in unpatterned and noncollinear arrangements. The unpatterned multiple N-fiducials appearing as scattered dots in the US image are difficult to extract, and the extracted data are usually contaminated with noise. In practice, the extraction mostly relied on manual interventions, and calibration with N-fiducial phantom has not yet achieved high accuracy with single or few frame calibrations due to noise contamination. AIMS: In this article, we propose a novel design of the N-fiducial US calibration phantom to enable automatic feature extraction with comparable accuracy to multiple frame calibration. MATERIALS AND METHODS: Along with the design, the Random Sample Consensus (RANSAC) algorithm was used for feature extraction with both 2D and 3D models estimation. The RANSAC feature extraction algorithm was equipped with a closed-form calibration method to achieve automatic calibration. RESULTS: The accuracy, precision, and shape reconstruction errors of the calibration acquired from the experiment were significantly matched with the previous literature reports. CONCLUSIONS: The results showed that our proposed method has a high efficiency to perform automatic feature extraction compared to conventional extraction performed by humans.
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spelling pubmed-67641762019-10-01 A Novel Design of N-Fiducial Phantom for Automatic Ultrasound Calibration Chatrasingh, Maria Suthakorn, Jackrit J Med Phys Original Article BACKGROUND: Freehand ultrasound (US) is a technique used to acquire three-dimensional (3D) US images using a tracked 2D US probe. Calibrating the probe with a proper calibration phantom improves the precision of the technique and allows several applications in computer-assisted surgery. N-fiducial phantom is widely used due to the robustness of precise fabrication and convenience of use. In principle, the design supports single-frame calibration by providing at least three noncollinear points in 3D space at once. Due to this requirement, most designs contain multiple N-fiducials in unpatterned and noncollinear arrangements. The unpatterned multiple N-fiducials appearing as scattered dots in the US image are difficult to extract, and the extracted data are usually contaminated with noise. In practice, the extraction mostly relied on manual interventions, and calibration with N-fiducial phantom has not yet achieved high accuracy with single or few frame calibrations due to noise contamination. AIMS: In this article, we propose a novel design of the N-fiducial US calibration phantom to enable automatic feature extraction with comparable accuracy to multiple frame calibration. MATERIALS AND METHODS: Along with the design, the Random Sample Consensus (RANSAC) algorithm was used for feature extraction with both 2D and 3D models estimation. The RANSAC feature extraction algorithm was equipped with a closed-form calibration method to achieve automatic calibration. RESULTS: The accuracy, precision, and shape reconstruction errors of the calibration acquired from the experiment were significantly matched with the previous literature reports. CONCLUSIONS: The results showed that our proposed method has a high efficiency to perform automatic feature extraction compared to conventional extraction performed by humans. Wolters Kluwer - Medknow 2019 /pmc/articles/PMC6764176/ /pubmed/31576067 http://dx.doi.org/10.4103/jmp.JMP_92_18 Text en Copyright: © 2019 Journal of Medical Physics http://creativecommons.org/licenses/by-nc-sa/4.0 This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.
spellingShingle Original Article
Chatrasingh, Maria
Suthakorn, Jackrit
A Novel Design of N-Fiducial Phantom for Automatic Ultrasound Calibration
title A Novel Design of N-Fiducial Phantom for Automatic Ultrasound Calibration
title_full A Novel Design of N-Fiducial Phantom for Automatic Ultrasound Calibration
title_fullStr A Novel Design of N-Fiducial Phantom for Automatic Ultrasound Calibration
title_full_unstemmed A Novel Design of N-Fiducial Phantom for Automatic Ultrasound Calibration
title_short A Novel Design of N-Fiducial Phantom for Automatic Ultrasound Calibration
title_sort novel design of n-fiducial phantom for automatic ultrasound calibration
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6764176/
https://www.ncbi.nlm.nih.gov/pubmed/31576067
http://dx.doi.org/10.4103/jmp.JMP_92_18
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