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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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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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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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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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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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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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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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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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A Comparison of Two Commercial Volumetry Software Programs in the Analysis of Pulmonary Ground-Glass Nodules: Segmentation Capability and Measurement Accuracy

Kim H, Park CM, Lee SM, Lee HJ, Goo JM

OBJECTIVE: To compare the segmentation capability of the 2 currently available commercial volumetry software programs with specific segmentation algorithms for pulmonary ground-glass nodules (GGNs) and to assess their measurement accuracy. MATERIALS...
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Evaluation of the effective dose and image quality of low-dose multi-detector CT for orthodontic treatment planning

Chung GC, Han WJ, Kim EK

  • KMID: 2270927
  • Korean J Oral Maxillofac Radiol.
  • 2010 Mar;40(1):15-23.
PURPOSE: This study was designed to compare the effective doses from low-dose and standard-dose multi-detector CT (MDCT) scanning protocols and evaluate the image quality and the spatial resolution of the...
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Measurement of hard tissue density of head phantom based on the HU by using CBCT

Kim MS, Kim JD, Kang DW

  • KMID: 2034178
  • Korean J Oral Maxillofac Radiol.
  • 2009 Sep;39(3):115-120.
PURPOSE: The purpose of this study was to determine a conversion coefficient for Hounsfield Units(HU) to material density (g cm-3) obtained from cone-beam computed tomography (CBMercuRay(TM)) data and to measure...
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Quantitative Analysis of Airway Walls Using CT Software

Kim TJ, Goo JM, Lee KW, Lee HJ, Kim KG, Im JG

PURPOSE: The purpose of this study was to develop dedicated software for quantitative analysis of the airways and to validate the software using airway phantoms and excised swine lung. MATERIALS AND...
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Image characteristics of cone beam computed tomography using a CT performance phantom

Han CW, Kim GT, Choi YS, Hwang EH

  • KMID: 2270901
  • Korean J Oral Maxillofac Radiol.
  • 2007 Sep;37(3):157-163.
PURPOSE: To evaluate the characteristics of (widely used) cone beam computed tomography (CBCT) images. MATERIALS AND METHODS: Images were obtained with CT performance phantoms (The American Association of Physicists in Medicine;...
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