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Correction of severe beam-hardening artifacts via a high-order linearization function using a prior-image-based parameter selection method.
Med Phys
June 2018
School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea.
Purpose: Polychromatic x-rays are used in most computed tomography scanners. In this case, a beam-hardening effect occurs, which degrades the image quality and distorts the shapes of objects in the reconstructed images. When the beam-hardening artifact is not severe, conventional correction methods can reduce the artifact reasonably well.
View Article and Find Full Text PDFNormal saline as a natural intravascular contrast agent for dynamic perfusion-weighted MRI of the brain: Proof of concept at 1.5T.
J Magn Reson Imaging
December 2016
Boston University School of Medicine, Boston, Massachusetts, USA.
Purpose: Gadolinium-based contrast agents have associated risks. Normal saline (NS) is a nontoxic sodium chloride water solution that can significantly increase the magnetic resonance imaging (MRI) relaxation times of blood via transient hemodilution (THD). The purpose of this pilot study was to test in vivo in the head the potential of normal saline as a safer, exogenous perfusion contrast agent.
View Article and Find Full Text PDFCORR (®) ArtiFacts: How We Walk.
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Historical Collections, National Museum of Health and Medicine, Defense Health Agency, 2460 Linden Lane, Silver Spring, MD, 20910, USA.
A New Imaging Platform for Visualizing Biological Effects of Non-Invasive Radiofrequency Electric-Field Cancer Hyperthermia.
PLoS One
May 2016
Department of Surgery, Division of Surgical Research, Baylor College of Medicine, Houston, TX, United States of America; Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, United States of America.
Herein, we present a novel imaging platform to study the biological effects of non-invasive radiofrequency (RF) electric field cancer hyperthermia. This system allows for real-time in vivo intravital microscopy (IVM) imaging of radiofrequency-induced biological alterations such as changes in vessel structure and drug perfusion. Our results indicate that the IVM system is able to handle exposure to high-power electric-fields without inducing significant hardware damage or imaging artifacts.
View Article and Find Full Text PDFA modulated closed form solution for quantitative susceptibility mapping--a thorough evaluation and comparison to iterative methods based on edge prior knowledge.
Neuroimage
February 2015
Department of Radiology, University of Lausanne, Lausanne, Switzerland. Electronic address:
The aim of this study is to perform a thorough comparison of quantitative susceptibility mapping (QSM) techniques and their dependence on the assumptions made. The compared methodologies were: two iterative single orientation methodologies minimizing the l2, l1TV norm of the prior knowledge of the edges of the object, one over-determined multiple orientation method (COSMOS) and a newly proposed modulated closed-form solution (MCF). The performance of these methods was compared using a numerical phantom and in-vivo high resolution (0.
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