A study of MRI gradient echo signals from discrete magnetic particles with considerations of several parameters in simulations
Modeling MRI signal behaviors in the presence of discrete magnetic particles is important, as magnetic particles appear in nanoparticle labeled cells, contrast agents, and other biological forms of iron. Currently, many models that take into account the discrete particle nature in a system have been used to predict magnitude signal decays in the form of R2* or R2 ′ from one single voxel. Little work has been done for predicting phase signals. In addition, most calculations of phase signals rely on the assumption that a system containing discrete particles behaves as a continuous medium. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 26, 2017 Category: Radiology Authors: Paul Kokeny, Yu-Chung N. Cheng, He Xie Tags: Original contribution Source Type: research
Simulation-based quantification of native T1 and T2 of the myocardium using a modified MOLLI scheme and the importance of Magnetization Transfer
Quantitative cardiovascular Magnetic Resonance Imaging techniques are gaining wide acceptance within the MR community due to their potential to diagnose non-localized disease, guide therapy and improve patient outcome. During the last decade, there has been an increasing interest for developing new techniques that allow for simultaneous quantification of both T1 and T2 maps of myocardium. Newer studies demonstrated that the incorporation of MRI simulations could yield similar results to conventional mapping techniques in the myocardium. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 26, 2017 Category: Radiology Authors: Christos G. Xanthis, Sebastian Bidhult, Andreas Greiser, Kelvin Chow, Richard B. Thompson, H åkan Arheden, Anthony H. Aletras Source Type: research
A study of MRI gradient echo signals from discrete magnetic particles with considerations of several parameters in simulations
Modeling MRI signal behaviors in the presence of discrete magnetic particles is important, as magnetic particles appear in nanoparticle labeled cells, contrast agents, and other biological forms of iron. Currently, many models that take into account the discrete particle nature in a system have been used to predict magnitude signal decays in the form of R2* or R2 ’ from one single voxel. Little work has been done for predicting phase signals. In addition, most calculations of phase signals rely on the assumption that a system containing discrete particles behaves as a continuous medium. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 26, 2017 Category: Radiology Authors: Paul Kokeny, Yu-Chung N. Cheng, He Xie Source Type: research
Simulation-based quantification of native T1 and T2 of the myocardium using a modified MOLLI scheme and the importance of Magnetization Transfer
Quantitative cardiovascular Magnetic Resonance Imaging techniques are gaining wide acceptance within the MR community due to their potential to diagnose non-localized disease, guide therapy and improve patient outcome. During the last decade, there has been an increasing interest for developing new techniques that allow for simultaneous quantification of both T1 and T2 maps of myocardium. Newer studies demonstrated that the incorporation of MRI simulations could yield similar results to conventional mapping techniques in the myocardium. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 26, 2017 Category: Radiology Authors: Christos G. Xanthis, Sebastian Bidhult, Andreas Greiser, Kelvin Chow, Richard B. Thompson, H åkan Arheden, Anthony H. Aletras Source Type: research
Phase unwinding for dictionary compression with multiple channel transmission in magnetic resonance fingerprinting
We describe a general method that allows to omit the transmit phases. We show that this enables straightforward implementation of dictionary compression to further reduce the problem dimensionality. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Riccardo Lattanzi, Bei Zhang, Florian Knoll, Jakob Assl änder, Martijn A. Cloos Tags: Technical note Source Type: research
Gd-EOB-DTPA-enhanced T1 ρ imaging vs diffusion metrics for assessment liver inflammation and early stage fibrosis of nonalcoholic steatohepatitis in rabbits
To assess the value of T1 ρ,T1ρ on hepatobiliary phase (HBP) and diffusion metrics in staging of Non-alcoholic fatty liver disease (NAFLD) activity scores, inflammation, fibrosis in NASH rabbits model. Non-alcoholic steatohepatitis (NASH) rabbits model was induced by feeding a varied duration of high-fat, high-cholesterol diet. T1ρ,T1ρ (HBP) 20min after administration of Gd-EOB-DTPA, and Intravoxel incoherent motion imaging (IVIM) diffusion-weighted imaging were performed on a 3.0T magnetic resonance (MR) imaging unit. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Yuanliang Xie, Hongfeng Zhang, Chaoling Jin, Xiang Wang, Xiaoqi Wang, Jingting Chen, Yikai Xu Tags: Original contribution Source Type: research
Optimal-permittivity Dielectric Liners for a 4.7T Transceiver Array
Placing dielectric pads adjacent to the imaging region is an effective method to increase the signal locally and also increase the radio frequency magnetic field homogeneity in magnetic resonance imaging. The use of local high permittivity pads is becoming more common, and this work focuses on the effect of larger dielectric pads on the transmit/receive performance of an array (e.g., coupling, efficiency and safety) having 8 channels, used to image a cylindrical phantom at 4.7T (200MHz). We investigate the effects of a dielectric liner surrounding the whole volume of interest both with and without an air gap. (Source: Magn...
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Atefeh Kordzadeh, Nicola De Zanche Source Type: research
Intravoxel incoherent motion diffusion-weighted MRI for predicting response to neoadjuvant chemotherapy in breast cancer
To determine the diagnostic performance of intravoxel incoherent motion (IVIM) diffusion-weighted (DW) magnetic resonance imaging (MRI) parameters in predicting response to neoadjuvant chemotherapy (NAC) in breast cancer patients. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Yunju Kim, Sung Hun Kim, Hye Won Lee, Byung Joo Song, Bong Joo Kang, Ahwon Lee, Yoonho Nam Source Type: research
Robust and efficient pharmacokinetic parameter non-linear least squares estimation for dynamic contrast enhanced MRI of the prostate
To describe an efficient numerical optimization technique using non-linear least squares to estimate perfusion parameters for the Tofts and extended Tofts models from dynamic contrast enhanced (DCE) MRI data and apply the technique to prostate cancer. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Soudabeh Kargar, Eric A. Borisch, Adam T. Froemming, Akira Kawashima, Lance A. Mynderse, Eric G. Stinson, Joshua D. Trzasko, Stephen J. Riederer Tags: Original contribution Source Type: research
Gd-EOB-DTPA-enhanced T1 ρ imaging vs diffusion metrics for assessment liver inflammation and early stage fibrosis of nonalcoholic steatohepatitis in rabbits
To assess the value of T1 ρ,T1ρ on hepatobiliary phase (HBP) and diffusion metrics in staging of Non-alcoholic fatty liver disease (NAFLD) activity scores, inflammation, fibrosis in NASH rabbits model. Non-alcoholic steatohepatitis (NASH) rabbits model was induced by feeding a varied duration of high-fat, high-cholesterol diet. T1ρ,T1ρ (HBP) 20min after administration of Gd-EOB-DTPA, and Intravoxel incoherent motion imaging (IVIM) diffusion-weighted imaging were performed on a 3.0T magnetic resonance (MR) imaging unit. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Yuanliang Xie, Hongfeng Zhang, Chaoling Jin, Xiang Wang, Xiaoqi Wang, Jingting Chen, Yikai Xu Tags: Original contribution Source Type: research
Phase unwinding for dictionary compression with multiple channel transmission in magnetic resonance fingerprinting
We describe a general method that allows to omit the transmit phases. We show that this enables straightforward implementation of dictionary compression to further reduce the problem dimensionality. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Riccardo Lattanzi, Bei Zhang, Florian Knoll, Jakob Assl änder, Martijn A. Cloos Tags: Technical note Source Type: research
Optimal-permittivity dielectric liners for a 4.7T Transceiver Array
Placing dielectric pads adjacent to the imaging region is an effective method to increase the signal locally and also increase the radio frequency magnetic field homogeneity in magnetic resonance imaging. The use of local high permittivity pads is becoming more common, and this work focuses on the effect of larger dielectric pads on the transmit/receive performance of an array (e.g., coupling, efficiency and safety) having 8 channels, used to image a cylindrical phantom at 4.7T (200MHz). We investigate the effects of a dielectric liner surrounding the whole volume of interest both with and without an air gap. (Source: Magn...
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Atefeh Kordzadeh, Nicola De Zanche Source Type: research
Intravoxel incoherent motion diffusion-weighted MRI for predicting response to neoadjuvant chemotherapy in breast cancer
To determine the diagnostic performance of intravoxel incoherent motion (IVIM) diffusion-weighted (DW) magnetic resonance imaging (MRI) parameters in predicting response to neoadjuvant chemotherapy (NAC) in breast cancer patients. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Yunju Kim, Sung Hun Kim, Hye Won Lee, Byung Joo Song, Bong Joo Kang, Ahwon Lee, Yoonho Nam Source Type: research
Robust and efficient pharmacokinetic parameter non-linear least squares estimation for dynamic contrast enhanced MRI of the prostate
To describe an efficient numerical optimization technique using non-linear least squares to estimate perfusion parameters for the Tofts and extended Tofts models from dynamic contrast enhanced (DCE) MRI data and apply the technique to prostate cancer. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 23, 2017 Category: Radiology Authors: Soudabeh Kargar, Eric A. Borisch, Adam T. Froemming, Akira Kawashima, Lance A. Mynderse, Eric G. Stinson, Joshua D. Trzasko, Stephen J. Riederer Tags: Original contribution Source Type: research
A comprehensive study on automated muscle segmentation for assessing fat infiltration in neuromuscular diseases
Severity and progression of degenerative neuromuscular diseases can be sensitively captured by evaluating the fat infiltration of muscle tissue in T1-weighted MRI scans of human limbs. For computing the fat fraction, the original muscle needs to be first separated from other tissue.Five conceptionally different approaches were investigated and evaluated with respect to the segmentation of muscles of human thighs. Besides a rather basic thresholding approach, local (level set) as well as global (graph cut) energy-minimizing segmentation approaches with and without a shape prior energy term were examined. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - December 18, 2017 Category: Radiology Authors: Michael Gadermayr, Constantin Disch, Madlaine M üller, Dorit Merhof, Burkhard Gess Source Type: research
