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Accuracy of Model-Based Iterative Reconstruction for CT Volumetry of Part-Solid Nodules and Solid Nodules in Comparison with Filtered Back Projection and Hybrid Iterative Reconstruction at Various Dose Settings: An Anthropomorphic Chest Phantom Study

Kim SK, Kim C, Lee KY, Cha J, Lim HJ, Kang EY, Oh YW

OBJECTIVE: To investigate the accuracy of model-based iterative reconstruction (MIR) for volume measurement of part-solid nodules (PSNs) and solid nodules (SNs) in comparison with filtered back projection (FBP) or hybrid...
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Quantitative Feasibility Evaluation of ¹¹C-Methionine Positron Emission Tomography Images in Gamma Knife Radiosurgery : Phantom-Based Study and Clinical Application

Lim SH, Jung TY, Jung S, Kim IY, Moon KS, Kwon SY, Jang WY

OBJECTIVE: The functional information of ¹¹C-methionine positron emission tomography (MET-PET) images can be applied for Gamma knife radiosurgery (GKR) and its image quality may affect defining the tumor. This study...
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Ideal Bolus Geometry Predicted from In vitro Pulsatile Flow Phantom and Artificial Neural Networks for the Optimization of Image Acquisition Protocols for Aortic Contrast-Enhanced Computed Tomography Angiography

Youn SW, Kwon J, Kim J, Park J, Ahn D, Lee J

OBJECTIVE: This study sought to explore the novel use of artificial neural networks (ANNs) to develop a contrast-enhanced computed tomography (CT) angiographic (CECTA) protocol based on ideal bolus geometry. MATERIALS AND...
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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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Effect of field-of-view size on gray values derived from cone-beam computed tomography compared with the Hounsfield unit values from multidetector computed tomography scans

Shokri A, Ramezani L, Bidgoli M, Akbarzadeh M, Ghazikhanlu-Sani K, Fallahi-Sichani H

PURPOSE: This study aimed to evaluate the effect of field-of-view (FOV) size on the gray values derived from conebeam computed tomography (CBCT) compared with the Hounsfield unit values from multidetector...
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Development of a new ball-type phantom for evaluation of the image layer of panoramic radiography

Yeom HG, Kim JE, Huh KH, Yi WJ, Heo MS, Lee SS, Choi SC

PURPOSE: This study proposes a new ball-type phantom for evaluation of the image layer of panoramic radiography. MATERIALS AND METHODS: The arch shape of an acrylic resin phantom was derived from...
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Analysis of Small-Field Dosimetry with Various Detectors

Park SY, Choi BG, Lee DM, Jang NY

We evaluated the performance of various detectors for small-field dosimetry with field sizes defined by a high-definition (HD) multileaf collimator (MLC) system. For small-field dosimetry, diodes referred to as “RAZOR...
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Optimizing the reconstruction filter in cone-beam CT to improve periodontal ligament space visualization: An in vitro study

Houno Y, Hishikawa , Gotoh KI, Naitoh M, Mitani A, Noguchi T, Ariji E, Kodera Y

PURPOSE: Evaluation of alveolar bone is important in the diagnosis of dental diseases. The periodontal ligament space is difficult to clearly depict in cone-beam computed tomography images because the reconstruction...
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The Effects of Breathing Motion on DCE-MRI Images: Phantom Studies Simulating Respiratory Motion to Compare CAIPIRINHA-VIBE, Radial-VIBE, and Conventional VIBE

Lee CK, Seo N, Kim B, Huh J, Kim JK, Lee SS, Kim IS, Nickel D, Kim KW

OBJECTIVE: To compare the breathing effects on dynamic contrast-enhanced (DCE)-MRI between controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA)-volumetric interpolated breath-hold examination (VIBE), radial VIBE with k-space-weighted image...
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Comparison of Image Quality between Mammography Dedicated Monitor and UHD 4K Monitor, Using Standard Mammographic Phantom: A Preliminary Study

Lee JY, Cha SJ, Hong SH, Kim SY, Kim YH, Kim YS, Kim JA

PURPOSE: Using standard mammographic phantom images, we compared the image quality obtained between a mammography dedicated 5 megapixel monitor (5M) and a UHD 4K (4K) monitor with digital imaging and...
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Three-Dimensional Fast Spin-Echo Imaging without Fat Suppression of the Knee: Diagnostic Accuracy Comparison to Fat-Suppressed Imaging on 1.5T MRI

Cho HW, Suh JS, Park JO, Kim HS, Chung SY, Lee YH, Hahn S

PURPOSE: To evaluate the diagnostic performance of three-dimensional fast spin-echo (3D FSE-Cube) without fat suppression (NFS) for detecting knee lesions, using comparison to 3D FSE-Cube with fat suppression (FS). MATERIALS AND...
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Evaluation of factors influencing arterial Doppler waveforms in an in vitro flow phantom

Sung CK, Lee KH, Kim SH

PURPOSE: The aim of this study was to investigate factors that influence arterial Doppler waveforms in an in vitro phantom to provide a more accurate and comprehensive explanation of the...
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Influence of B₁-Inhomogeneity on Pharmacokinetic Modeling of Dynamic Contrast-Enhanced MRI: A Simulation Study

Park B, Choi BS, Sung YS, Woo DC, Shim WH, Kim KW, Choi YS, Pae SJ, Suh JY, Cho H, Kim JK

OBJECTIVE: To simulate the B₁-inhomogeneity-induced variation of pharmacokinetic parameters on dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). MATERIALS AND METHODS: B₁-inhomogeneity-induced flip angle (FA) variation was estimated in a phantom study. Monte...
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Dual-Energy CT: New Horizon in Medical Imaging

Goo HW, Goo JM

Dual-energy CT has remained underutilized over the past decade probably due to a cumbersome workflow issue and current technical limitations. Clinical radiologists should be made aware of the potential clinical...
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Contrast reference values in panoramic radiographic images using an arch-form phantom stand

Shin JM, Lee C, Kim JE, Huh KH, Yi WJ, Heo MS, Choi SC, Lee SS

PURPOSE: The purpose of this study was to investigate appropriate contrast reference values (CRVs) by comparing the contrast in phantom and clinical images. MATERIALS AND METHODS: Phantom contrast was measured using...
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Phantom Study of a New Laser-Etched Needle for Improving Visibility During Ultrasonography-Guided Lumbar Medial Branch Access With Novices

Park JW, Cheon MW, Lee MH

OBJECTIVE: To compare the visibility and procedural parameters between a standard spinal needle and a new laser-etched needle (LEN) in real-time ultrasonography guided lumbar medial branch access in a phantom...
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Preclinical evaluation of acoustic radiation force impulse measurements in regions of heterogeneous elasticity

Hollerieth K, Gaßmann B, Wagenpfeil S, Moog P, Vo-Cong MT, Heemann U, Stock KF

PURPOSE: The purpose of this study was to compare the reliability of ultrasound-based shear wave elastography in regions of homogeneous versus heterogeneous elasticity by using two different probes. METHODS: Using acoustic...
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Intervention Planning Using a Laser Navigation System for CT-Guided Interventions: A Phantom and Patient Study

Gruber-Rouh T, Lee C, Bolck J, Naguib NN, Schulz B, Eichler K, Aschenbach R, Wichmann J, Vogl TJ, Zangos S

OBJECTIVE: To investigate the accuracy, efficiency and radiation dose of a novel laser navigation system (LNS) compared to those of free-handed punctures on computed tomography (CT). MATERIALS AND METHODS: Sixty punctures...
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Effect of the High-Pitch Mode in Dual-Source Computed Tomography on the Accuracy of Three-Dimensional Volumetry of Solid Pulmonary Nodules: A Phantom Study

Hwang SH, Oh YW, Ham SY, Kang EY, Lee KY

OBJECTIVE: To evaluate the influence of high-pitch mode (HPM) in dual-source computed tomography (DSCT) on the accuracy of three-dimensional (3D) volumetry for solid pulmonary nodules. MATERIALS AND METHODS: A lung phantom...
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Effects of MR Parameter Changes on the Quantification of Diffusion Anisotropy and Apparent Diffusion Coefficient in Diffusion Tensor Imaging: Evaluation Using a Diffusional Anisotropic Phantom

Kim SJ, Choi CG, Kim JK, Yun SC, Jahng GH, Jeong HK, Kim EJ

OBJECTIVE: To validate the usefulness of a diffusional anisotropic capillary array phantom and to investigate the effects of diffusion tensor imaging (DTI) parameter changes on diffusion fractional anisotropy (FA) and...
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