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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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Determination and classification of intraoral phosphor storage plate artifacts and errors

Deniz Y, Kaya S

PURPOSE: The aim of this study was to determine the reasons and solutions for intraoral phosphor storage plate (PSP) image artifacts and errors, and to develop an appropriate classification of...
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U-net based metal segmentation on projection domain for metal artifact reduction in dental CT

Hegazy MA, Cho MH, Cho MH, Lee SY

Unlike medical computed tomography (CT), dental CT often suffers from severe metal artifacts stemming from high-density materials employed for dental prostheses. Despite the many metal artifact reduction (MAR) methods available...
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Comet tail artifact on ultrasonography: is it a reliable finding of benign gallbladder diseases?

Oh SH, Han HY, Kim HJ

PURPOSE: The aim of this study was to evaluate whether the comet tail artifact on ultrasonography can be used to reliably diagnose benign gallbladder diseases. METHODS: This retrospective study reviewed the...
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Cervical Spine CT Using Spectral Shaping: Can It Be a Solution to Overcome Artifacts in the Lower Cervical Spinal Region?

Lee SM, Choo HJ, Lee SJ, Kim SK, Lee IS, Kim DW, Baek JW, Heo YJ

OBJECTIVE: To investigate the image quality, radiation dose, and intermodality agreement of cervical spine CT using spectral shaping at 140 kVp by a tin filter (Sn140-kVp) in comparison with those...
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Image quality and artifacts in automated breast ultrasonography

Kim SH

Three-dimensional automated breast ultrasonography (ABUS) has been approved for screening Epub ahead of print studies as an adjunct to mammography. ABUS provides proper orientation and documentation, resulting in better reproducibility....
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Effect of object position in the field of view and application of a metal artifact reduction algorithm on the detection of vertical root fractures on cone-beam computed tomography scans: An in vitro study

Nikbin A, Dalili Kajan Z, Taramsari , Khosravifard N

PURPOSE: To assess the effects of object position in the field of view (FOV) and application of a metal artifact reduction (MAR) algorithm on the diagnostic accuracy of cone-beam computed...
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Susceptibility Weighted Imaging of the Cervical Spinal Cord with Compensation of Respiratory-Induced Artifact

Lee H, Nam Y, Gho SM, Han D, Kim EY, Lee SW, Kim DH

PURPOSE: The objective of this study was to obtain improved susceptibility weighted images (SWI) of the cervical spinal cord using respiratory-induced artifact compensation. MATERIALS AND METHODS: The artifact from B0 fluctuations...
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Metal Artifact Reduction for Orthopedic Implants: Brain CT Angiography in Patients with Intracranial Metallic Implants

Sunwoo L, Park SW, Rhim JH, Kang Y, Chung YS, Son YJ, Kim SC

BACKGROUND: The purpose of this study was to qualitatively and quantitatively evaluate the effects of a metal artifact reduction for orthopedic implants (O-MAR) for brain computed tomographic angiography (CTA) in...
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Metal artifact production and reduction in CBCT with different numbers of basis images

Queiroz PM, Santaella , Groppo FC, Freitas DQ

PURPOSE: To evaluate the effect of different numbers of basis images and the use of metal artifact reduction (MAR) on the production and reduction of artifacts in cone-beam computed tomography...
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Comparison of Metal Artifact Reduction for Orthopedic Implants versus Standard Filtered Back Projection: Value of Postoperative CT after Hip Replacement

Rim J, Choi JA, Lee SA, Khil EK

PURPOSE: To evaluate Metal Artifact Reduction for Orthopedic Implants (O-MAR, Philips Healthcare) technique compared with standard filtered back projection (SFBP) technique on post-operative hip CT regarding image noise reduction and...
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Novel tailoring algorithm for abrupt motion artifact removal in photoplethysmogram signals

Pu L, Chacon PJ, Wu HC, Choi JW

Photoplethysmogram (PPG) signals are widely used for wearable electronic devices nowadays. The PPG signal is extremely sensitive to the motion artifacts (MAs) caused by the subject's movement. The detection and...
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Quantitative assessment of image artifacts from root filling materials on CBCT scans made using several exposure parameters

Rabelo KA, Cavalcanti YW, de Oliveira Pinto MG, Sousa Melo SL, Campos PS, de Andrade Freitas Oliveira LS, de Melo DP

PURPOSE: To quantify artifacts from different root filling materials in cone-beam computed tomography (CBCT) images acquired using different exposure parameters. MATERIALS AND METHODS: Fifteen single-rooted teeth were scanned using 8 different...
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A Case of Double Fovea Artifact Detected with Spectral-domain Optical Coherence Tomography

Park HS, Jeong HK, Shin WB, Yang JY

PURPOSE: In the present study, a case of double fovea artifact on spectral-domain optical coherence tomography (SD-OCT) was reported. CASE SUMMARY: A nine-year-old male presented with blurred vision of both eyes....
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Limitations and artifacts in shear-wave elastography of the liver

Bruce M, Kolokythas O, Ferraioli , Filice C, O'Donnell

Recent studies have shown that real-time, two-dimensional shear-wave elastography (2D-SWE) can monitor liver fibrosis by measuring tissue elasticity (i.e., elastic modulus). Two clinical studies of 2D-SWE in the liver have...
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Improvement of Fat Suppression and Artifact Reduction Using IDEAL Technique in Head and Neck MRI at 3T

Hong JH, Lee HY, Kang YH, Lim MK, Kim YJ, Cho SG, Kim MY

PURPOSE: To quantitatively and qualitatively compare fat-suppressed MRI quality using iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) with that using frequency selective fat-suppression (FSFS)...
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