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Comparison of Hemodynamic Energy between Expanded Polytetrafluoroethylene and Dacron Artificial Vessels

Lim J, Won JY, Ahn CB, Kim J, Kim HJ, Jung JS

Background: Artificial grafts such as polyethylene terephthalate (Dacron) and expanded polytetrafluoroethylene (ePTFE) are used for various cardiovascular surgical procedures. The compliance properties of prosthetic grafts could affect hemodynamic energy, which can...
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Blended-Transfer Learning for Compressed-Sensing Cardiac CINE MRI

Park SJ, Ahn CB

Purpose: To overcome the difficulty in building a large data set with a high-quality in medical imaging, a concept of 'blended-transfer learning' (BTL) using a combination of both source data...
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Biases in the Assessment of Left Ventricular Function by Compressed Sensing Cardiovascular Cine MRI

Yoon JH, Kim PK, Yang YJ, Park J, Choi BW, Ahn CB

PURPOSE: We investigate biases in the assessments of left ventricular function (LVF), by compressed sensing (CS)-cine magnetic resonance imaging (MRI). MATERIALS AND METHODS: Cardiovascular cine images with short axis view, were...
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Simultaneous Unwrapping Phase and Error Recovery from Inhomogeneity (SUPER) for Quantitative Susceptibility Mapping of the Human Brain

Yang YJ, Yoon JH, Baek HM, Ahn CB

PURPOSE: The effect of global inhomogeneity on quantitative susceptibility mapping (QSM) was investigated. A technique referred to as Simultaneous Unwrapping Phase with Error Recovery from inhomogeneity (SUPER) is suggested as...
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The Effect of Pulsatile Versus Nonpulsatile Blood Flow on Viscoelasticity and Red Blood Cell Aggregation in Extracorporeal Circulation

Ahn CB, Kang YJ, Kim MG, Yang S, Lim CH, Son HS, Kim JS, Lee SY, Son KH, Sun K

BACKGROUND: Extracorporeal circulation (ECC) can induce alterations in blood viscoelasticity and cause red blood cell (RBC) aggregation. In this study, the authors evaluated the effects of pump flow pulsatility on...
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3D Printing Technology and Its Applications for Tissue/Organ Regeneration

Ahn CB, Son KH, Lee JW

Three-dimensional (3D) printing, also known as additive manufacturing (AM), has been used frequently in regenerative or translational medicine. In addition, recent advances in 3D printing technologies have opened the door...
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Surgical Planning by 3D Printing for Primary Cardiac Schwannoma Resection

Son KH, Kim KW, Ahn CB, Choi CH, Park KY, Park CH, Lee JI, Jeon YB

We report herein a case of benign cardiac schwannoma in the interatrial septum. A 42-year-old woman was transferred from a clinic because of cardiomegaly as determined by chest X-ray. A...
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Fast Cardiac CINE MRI by Iterative Truncation of Small Transformed Coefficients

Park J, Hong HJ, Yang YJ, Ahn CB

PURPOSE: A new compressed sensing technique by iterative truncation of small transformed coefficients (ITSC) is proposed for fast cardiac CINE MRI. MATERIALS AND METHODS: The proposed reconstruction is composed of two...
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Cardiac Magnetic Resonance Imaging Using Multi-physiological Intelligent Trigger System

Park J, Yoon JH, Yang YJ, Ahn CB

PURPOSE: We proposed a multi-physiological signals based real-time intelligent triggering system(MITS) for Cardiac MRI. Induced noise of the system was analyzed. MATERIALS AND METHODS: MITS makes cardiac MR imaging sequence synchronize...
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Water-Fat Imaging with Automatic Field Inhomogeneity Correction Using Joint Phase Magnitude Density Function at Low Field MRI

Kim PK, Ahn CB

PURPOSE: A new inhomogeneity correction method based on two-point Dixon sequence is proposed to obtain water and fat images at 0.35T, low field magnetic resonance imaging (MRI) system. MATERIALS AND METHODS:...
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Model-based Gradient Compensation in Spiral Imaging

Cho SH, Kim PK, Lim JW, Ahn CB

  • KMID: 1471614
  • J Korean Soc Magn Reson Med.
  • 2009 Jun;13(1):15-21.
PURPOSE: A method to estimate a real k-space trajectory based on a circuit model of the gradient system is proposed for spiral imaging. The estimated k-space trajectory instead of the...
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Study of Motion Effects in Cartesian and Spiral Parallel MRI Using Computer Simulation

Park SK, Ahn CB, Sim DG, Park H

  • KMID: 2144315
  • J Korean Soc Magn Reson Med.
  • 2008 Dec;12(2):123-130.
PURPOSE: Motion effects in parallel magnetic resonance imaging (MRI) are investigated. Parallel MRI is known to be robust to motion due to its reduced acquisition time. However, if there are...
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Clinical Significance of E-cadherin and beta-catenin Complex Expression in T2 Colorectal Cancer

Kim JS, Ko YT, Hur H, Min BS, Kim NK, Sohn SK, Cho CH, Ahn CB, Kim H

PURPOSE: Expression of adhesion molecules is significantly correlated with the invasion and the metastasis of colorectal cancer. The aim of this study is to identify the importance of the expressions...
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Higher Order Shimming for Ultra-fast Spiral-Scan Imaging at 3 Tesla MRI System

Kim PK, Lim JW, Ahn CB

  • KMID: 2206900
  • J Korean Soc Magn Reson Med.
  • 2007 Dec;11(2):95-102.
PURPOSE: To acquire high-resolution spiral-scan images at higher magnetic field, high homogeneous magnetic field is needed. Field inhomogeneity mapping and in-vivo shimming are important for rapid imaging such as spiral-scan...
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High-resolution Spiral-scan Imaging at 3 Tesla MRI

Ahn CB, Kim PK, Lim JW, Kang SW, Cho SH, Jeon SY, Lim HJ, Park HC, Oh SJ, Lee HK

  • KMID: 2206896
  • J Korean Soc Magn Reson Med.
  • 2006 Dec;10(2):108-116.
PURPOSE : High-resolution spiral-scan imaging is performed at 3 Tesla MRI system. Since the gradient waveforms for the spiral-scan imaging have lower slopes than those for the Echo Planar Imaging...
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Development of MRI Phantom for Assessing MR Image Quality

Song IC, Ahn CB, Na DG, Kim KG, Kim DS, Kim IS, Lee JW, Hong SJ, Byun JH, Khang HS, Jang GW

  • KMID: 2206894
  • J Korean Soc Magn Reson Med.
  • 2006 Dec;10(2):89-97.
PURPOSE : To evaluate MR image qualities we developed a new MRI phantom with the fixation structures necessary to position it into coil firmly. MATERIALS AND METHODS : We designed MRI...
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f-MRI with Three-Dimensional Visual Stimulation

Ahn CB, Kim CY, Park HJ, Oh SJ

  • KMID: 2330917
  • J Korean Soc Magn Reson Med.
  • 2005 Jun;9(1):24-29.
PURPOSE: Instead of conventional two-dimensional (2-D) visual stimuli, three-dimensional (3-D) visual stimuli with stereoscopic vision were employed for the study of functional Magnetic Resonance Imaging (f-MRI). In this paper f-MRI...
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Analysis of Quantization Noise in Magnetic Resonance Imaging Systems

Ahn CB

  • KMID: 2041245
  • J Korean Soc Magn Reson Med.
  • 2004 Jun;8(1):42-49.
PURPOSE: The quantization noise in magnetic resonance imaging (MRI) systems is analyzed. The signal-to-quantization noise ratio (SQNR) in the reconstructed image is derived from the level of quantization in the...
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Design of MRI Spectrometer Using 1 Giga-FLOPS DSP

Kim HJ, Ko KH, Lee SC, Jung MY, Chang KS, Lee DH, Lee HK, Ahn CB

  • KMID: 1516295
  • J Korean Soc Magn Reson Med.
  • 2003 Jun;7(1):12-21.
PURPOSE: In order to overcome limitations in the existing conventional spectrometer, a new spectrometer with advanced functionalities is designed and implemented. MATERIALS AND METHODS: We designed a spectrometer using the...
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High Resolution MR Images from 3T Active-Shield Whole-Body MRI System

Choe BY, Kang SK, Chu MJ, Baik HM, Kim EN, Kim BS, Lee JM, Chung ST, Ahn CB, Oh CH, Kim JH, Kim SI, Lee KN, Suh TS, Lee HK, Lee HK, Shinn KS

  • KMID: 1584775
  • J Korean Soc Magn Reson Med.
  • 2001 Dec;5(2):138-148.
PURPOSE: Within a clinically acceptable time frame, we obtained the high resolution MR images of the human brain, knee, foot and wrist from 3T whole-body MRI system which was equipped...
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