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Effect of Total Collimation Width on Relative Electron Density, Effective Atomic Number, and Stopping Power Ratio Acquired by Dual-Layer Dual-Energy Computed Tomography

Jung S, Kim B, Yoon E, Kim Ji, Park JM, Choi CH

Purpose: This study aimed to evaluate the effect of collimator width on effective atomic number (EAN), relative electron density (RED), and stopping power ratio (SPR) measured by dual-layer dual-energy computed...
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Influence of receiver bandwidth on MRI artifacts caused by orthodontic brackets composed of different alloys

Abdala-Junior R, No-Cortes J, Arita ES, Ackerman JL, Berbel da Silva RL, Kim JH, Gonzalez Cortes AR

Purpose: The aim of this in vitro study was to assess the role of bandwidth on the area of magnetic resonance imaging (MRI) artifacts caused by orthodontic appliances composed of...
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Efficacy of 3D-Printed Titanium Mesh-Type Patient-Specific Implant for Cranioplasty

Yoon HG, Ko Y, Kim YS, Bak KH, Chun HJ, Na MK, Yang S, Yi HJ, Choi KS

Objective: Autologous bone grafting for cranioplasty is associated with a high infection rate and bone absorption. Synthetic implant materials for cranioplasty have been developed. In this study, we evaluated the...
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Comparison of the Quality of Various Polychromatic and Monochromatic Dual-Energy CT Images with or without a Metal Artifact Reduction Algorithm to Evaluate Total Knee Arthroplasty

Choo HJ, Lee SJ, Kim DW, Lee YJ, Baek JW, Han Jy, Heo YJ

Objective: To compare the quality of various polychromatic and monochromatic images with or without using an iterative metal artifact reduction algorithm (iMAR) obtained from a dual-energy computed tomography (CT) to...
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Cone-beam computed tomography artifacts in the presence of dental implants and associated factors: An integrative review

Terrabuio BR, Carvalho CG, Peralta-Mamani M, Silva Santos PSd, Rubira-Bullen IRF, Fischer Rubira CM

Purpose This study was conducted to review the literature regarding the types of cone-beam computed tomography (CBCT) artifacts around dental implants and the factors that influence their formation. Materials and Methods A search...
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Feasibility of Improving the Accuracy of Dose Calculation Using Hybrid Computed Tomography Images: A Phantom Study

Jeon H, Kim DW, Joo JH, Ki Y, Kim W, Park D, Nam J, Kim DH

Purpose: Kilovoltage computed tomography (kV-CT) is essential for radiation treatment planning. However, kV-CT images are significantly distorted by artifacts when a metallic prosthesis is present in the patient's body. Thus, the...
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Assessment of the efficiency of a pre- versus post-acquisition metal artifact reduction algorithm in the presence of 3 different dental implant materials using multiple CBCT settings: An in vitro study

Shahmirzadi S, Sharaf RA, Saadat S, Moore WS, Geha H, Tamimi D, Kocasarac HD

Purpose The aim of this study was to assess artifacts generated in cone-beam computed tomography (CBCT) of 3 types of dental implants using 3 metal artifact reduction (MAR) algorithm conditions (pre-acquisition...
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Influence of CBCT metal artifact reduction on vertical radicular fracture detection

Oliveira MR, Sousa TO, Caetano AF, Paiva RRd, Valladares-Neto J, Yamamoto-Silva FP, Garcia Silva MA

Purpose This study evaluated the influence of a metal artifact reduction (MAR) tool in a cone-beam computed tomography (CBCT) device on the diagnosis of vertical root fractures (VRFs) in teeth with...
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Characteristics of Magnetic Resonance-Based Attenuation Correction Map on Phantom Study in Positron Emission Tomography/Magnetic Resonance Imaging System

Hong C

An MR-based attenuation correction (MRAC) map plays an important role in quantitative positron emission tomography (PET) image evaluation in PET/magnetic resonance imaging (MRI) systems.However, the MRAC map is affected by...
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Deep Learning in MR Motion Correction:a Brief Review and a New Motion Simulation Tool (view2Dmotion)

Lee S, Jung S, Jung KJ, Kim DH

With the development of deep-learning techniques, the application of deep learning in MR imaging processing seems to be growing. Accordingly, deep learning has also been introduced in motion correction and...
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Advanced Wiener Filter for Helical Windmill Artifact Reduction

Kim H, Cho S, Cho S

  • KMID: 2510052
  • Prog Med Phys.
  • 2020 Sep;31(S1):S24.
Purpose: Inadequate sampling along the longitudinal direction in a helical fan-/cone-beam CT can cause a windmill artifact rotating with black/white patterns in the axial planes. Furthermore, this artifact contaminates structural...
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Heart Rate Variability Analysis: How Much Artifact Can We Remove?

Sheridan DC, Dehart R, Lin A, Sabbaj M, Baker SD

Objective Heart rate variability (HRV) evaluates small beat-to-beat time interval (BBI) differences produced by the heart and suggested as a marker of the autonomic nervous system. Artifact produced by movement...
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Influence of reconstruction parameters of micro-computed tomography on the analysis of bone mineral density

Gaêta-Araujo H, Nascimento EHL, Brasil DM, Madlum DV, Haiter-Neto F, Oliveira-Santos C

Purpose:This study was conducted evaluate the influence of reconstruction parameters of micro-computed tomography (micro-CT) images on bone mineral density (BMD) analyses. Materials and Methods:The sample consisted of micro-CT images of the...
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Influence of tooth position within the field of view on the intensity of cone-beam computed tomographic imaging artifacts when assessing teeth restored with various intracanal materials

Pinto MGdO, Melo SLS, Cavalcanti YW, Lima EDd, Bento PM, Melo DPd

Purpose:This study aimed to quantify the influence of tooth position within the field-of-view (FOV) on cone-beam computed tomography (CBCT) imaging artifacts' intensity when assessing teeth restored with various intracanal materials. Materials...
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Perceived Dark Rim Artifact in First-Pass Myocardial Perfusion Magnetic Resonance Imaging Due to Visual Illusion

Shin T, Nayak KS

OBJECTIVE: To demonstrate that human visual illusion can contribute to sub-endocardial dark rim artifact in contrast-enhanced myocardial perfusion magnetic resonance images. MATERIALS AND METHODS: Numerical phantoms were generated to simulate the...
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Does the metal artifact reduction algorithm activation mode influence the magnitude of artifacts in CBCT images?

Fontenele , Nascimento EHL, Santaella , Freitas DQ

PURPOSE: This study was conducted to assess the effectiveness of a metal artifact reduction (MAR) algorithm activated at different times during cone-beam computed tomography (CBCT) acquisition on the magnitude of...
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Magnitude of beam-hardening artifacts produced by gutta-percha and metal posts on cone-beam computed tomography with varying tube current

Gaêta-Araujo H, Nascimento EHL, Fontenele , Mancini AX, Freitas DQ, Oliveira-Santos C

PURPOSE: This study was performed to evaluate the magnitude of artifacts produced by gutta-percha and metal posts on cone-beam computed tomography (CBCT) scans obtained with different tube currents and with...
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Metallic Artifacts on MR Imaging and Methods for Their Reduction

Choo HJ, Lee SJ, Lee YH

Metallic artifacts on MR imaging are typically induced by differences in magnetic susceptibility between the metallic implant and surrounding tissue. Conventional techniques for metal artifact reduction require MR machines with...
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Parameters Affecting India Ink Artifacts on Opposed-Phase MR Images

Kim BR, Ha DH

PURPOSE: To determine the MR parameters affecting India ink artifacts on opposed-phase chemical shift magnetic resonance (MR) imaging. MATERIALS AND METHODS: The use of a female Sprague-Dawley rat was approved by...
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The “Lip Sign” in MRI of the Spinal Cord

Tarafdar S, Mohan A, Nagarajan

No abstract available.
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