Assessment of collagen fiber orientation dispersion in articular cartilage by small-angle X-ray scattering and diffusion tensor imaging: Preliminary results
Measurements of the orientational dispersion of collagen fibers in articular cartilage were made using diffusion tensor imaging (DTI) and small-angle X-ray scattering (SAXS) on matched bovine articular cartilage samples. Thirteen pairs of samples were excised from bovine knee joints; each pair was taken from neighboring locations in the same bone. One sample from each pair was used for DTI measurements and the other for SAXS measurements. Fractional anisotropy (FA) values were calculated from the DTI data both for the individual imaging voxels and for whole regions of interest (ROI). (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 3, 2018 Category: Radiology Authors: Sirisha Tadimalla, Monique C. Tourell, Robert Knott, Konstantin I. Momot Source Type: research
Comparison of cumulant expansion and q-space imaging estimates for diffusional kurtosis in brain
To compare estimates for the diffusional kurtosis in brain as obtained from a cumulant expansion (CE) of the diffusion MRI (dMRI) signal and from q-space (QS) imaging. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 3, 2018 Category: Radiology Authors: Vaibhav Mohanty, Emilie T. McKinnon, Joseph A. Helpern, Jens H. Jensen Tags: Original contribution Source Type: research
Glutamate quantification by PRESS or MEGA-PRESS: Validation, repeatability, and concordance
This study aimed to compare validation, repeatability, and concordance of different approaches for glutamate quantification at 3T to aid future studies in their selection of the appropriate sequence and quantification method. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 3, 2018 Category: Radiology Authors: Tamar M. van Veenendaal, Walter H. Backes, Frank C.G. van Bussel, Richard A.E. Edden, Nicolaas A.J. Puts, Albert P. Aldenkamp, Jacobus F.A. Jansen Tags: Original contribution Source Type: research
Assessment of collagen fiber orientation dispersion in articular cartilage by small-angle X-ray scattering and diffusion tensor imaging: Preliminary results
Measurements of the orientational dispersion of collagen fibers in articular cartilage were made using diffusion tensor imaging (DTI) and small-angle X-ray scattering (SAXS) on matched bovine articular cartilage samples. Thirteen pairs of samples were excised from bovine knee joints; each pair was taken from neighboring locations in the same bone. One sample from each pair was used for DTI measurements and the other for SAXS measurements. Fractional anisotropy (FA) values were calculated from the DTI data both for the individual imaging voxels and for whole regions of interest (ROI). (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 3, 2018 Category: Radiology Authors: Sirisha Tadimalla, Monique C. Tourell, Robert Knott, Konstantin I. Momot Source Type: research
Comparison of cumulant expansion and Q-space imaging estimates for diffusional kurtosis in brain
To compare estimates for the diffusional kurtosis in brain as obtained from a cumulant expansion (CE) of the diffusion MRI (dMRI) signal and from q-space (QS) imaging. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 3, 2018 Category: Radiology Authors: Vaibhav Mohanty, Emilie T. McKinnon, Joseph A. Helpern, Jens H. Jensen Tags: Original contribution Source Type: research
Glutamate quantification by PRESS or MEGA-PRESS: Validation, repeatability, and concordance
This study aimed to compare validation, repeatability, and concordance of different approaches for glutamate quantification at 3T to aid future studies in their selection of the appropriate sequence and quantification method. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 3, 2018 Category: Radiology Authors: Tamar M. van Veenendaal, Walter H. Backes, Frank C.G. van Bussel, Richard A.E. Edden, Nicolaas A.J. Puts, Albert P. Aldenkamp, Jacobus F.A. Jansen Tags: Original contribution Source Type: research
Evaluation of lymphedema in upper extremities by MR lymphangiography: Comparison with lymphoscintigraphy
To validate usefulness of magnetic resonance (MR) lymphangiography for evaluation of peripheral lymphedema in upper extremities by comparison with lymphoscintigraphy. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 3, 2018 Category: Radiology Authors: Jae Seok Bae, Roh-Eul Yoo, Seung Hong Choi, Seong Oh. Park, Hak Chang, Minseok Suh, Gi Jeong Cheon Tags: Original contribution Source Type: research
Image-based MRI gradient estimation
In order to reduce geometric distortion phenomena in MR images, every MRI system main magnet undergoes a shimming process. Since this process aims at optimizing magnetic field homogeneity within a so-called uniformity sphere, image quality outside this sphere is neglected.Since the fields vary smoothly in space, MR signal-to-noise ratio is still non-zero just outside the uniformity region, but correction of MR image distortion fails due to lack of magnetic field knowledge outside it.We propose a novel algorithm for measuring all the fields involved in the generation of images. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 2, 2018 Category: Radiology Authors: Roberto Acquaviva, Stefano Mangione, Giovanni Garbo Source Type: research
Motion-sensitized SPRITE measurements of hydrodynamic cavitation in fast pipe flow
The pressure variations experienced by a liquid flowing through a pipe constriction can, in some cases, result in the formation of a bubble cloud (i.e., hydrodynamic cavitation). Due to the nature of the bubble cloud, it is ideally measured through the use of non-optical and non-invasive techniques; therefore, it is well-suited for study by magnetic resonance imaging. This paper demonstrates the use of Conical SPRITE (a 3D, centric-scan, pure phase-encoding pulse sequence) to acquire time-averaged void fraction and velocity information about hydrodynamic cavitation for water flowing through a pipe constriction. (Source: Ma...
Source: Magnetic Resonance Imaging - January 2, 2018 Category: Radiology Authors: Alexander Adair, Igor V. Mastikhin, Benedict Newling Source Type: research
7.0Tesla MRI tractography in patients with trigeminal neuralgia
In this study, 14 patients (28 hemispheres) of mean age 49.0years (range, 31 –64) with TN underwent DTI using 7.0TMRI. We compared fractional anisotropy (FA), axial diffusivity (AD), mean diffusivity (MD), and radial diffusivity (RD) of affected-side and unaffected-side trigeminal nerves using DTI. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 2, 2018 Category: Radiology Authors: Hyeong Cheol Moon, Soon-Tae You, Hyeon Man Baek, Young Jai Jeon, Chan-A Park, Jei Jun Cheong, Youn Joo Lee, Young Seok Park Tags: Original contribution Source Type: research
Assessing diffusion kurtosis tensor estimation methods using a digital brain phantom derived from human connectome project data
Diffusion kurtosis imaging (DKI) has gained popularity in recent years as an advanced diffusion-weighted MRI technique. This work aims to quantitatively compare the performance and accuracy of four DKI processing algorithms. For this purpose, a digital DKI brain phantom is developed. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 2, 2018 Category: Radiology Authors: Daniel V. Olson, Volkan E. Arpinar, L. Tugan Muftuler Source Type: research
7.0Tesla MRI tractography in patients with trigeminal neuralgia
In this study, 14 patients (28 hemispheres) of mean age 49.0years (range, 31 –64) with TN underwent DTI using 7.0TMRI. We compared fractional anisotropy (FA), axial diffusivity (AD), mean diffusivity (MD), and radial diffusivity (RD) of affected-side and unaffected-side trigeminal nerves using DTI. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 2, 2018 Category: Radiology Authors: Hyeong Cheol Moon, Soon-Tae You, Hyeon Man Baek, Young Jai Jeon, Chan-A Park, Jei Jun Cheong, Youn Joo Lee, Young Seok Park Tags: Original contribution Source Type: research
Image-based MRI Gradient Estimation
In order to reduce geometric distortion phenomena in MR images, every MRI system main magnet undergoes a shimming process. Since this process aims at optimizing magnetic field homogeneity within a so-called uniformity sphere, image quality outside this sphere is neglected.Since the fields vary smoothly in space, MR signal-to-noise ratio is still non-zero just outside the uniformity region, but correction of MR image distortion fails due to lack of magnetic field knowledge outside it.We propose a novel algorithm for measuring all the fields involved in the generation of images. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 2, 2018 Category: Radiology Authors: R. Acquaviva, S. Mangione, G. Garbo Source Type: research
Assessing diffusion kurtosis tensor estimation methods using a digital brain phantom derived from human connectome project data
Diffusion kurtosis imaging (DKI) has gained popularity in recent years as an advanced diffusion-weighted MRI technique. This work aims to quantitatively compare the performance and accuracy of four DKI processing algorithms. For this purpose, a digital DKI brain phantom is developed. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - January 2, 2018 Category: Radiology Authors: Daniel V. Olson, Volkan Arpinar, L. Tugan Muftuler Source Type: research
Motion-sensitized SPRITE measurements of hydrodynamic cavitation in fast pipe flow
The pressure variations experienced by a liquid flowing through a pipe constriction can, in some cases, result in the formation of a bubble cloud (i.e., hydrodynamic cavitation). Due to the nature of the bubble cloud, it is ideally measured through the use of non-optical and non-invasive techniques; therefore, it is well-suited for study by magnetic resonance imaging. This paper demonstrates the use of Conical SPRITE (a 3D, centric-scan, pure phase-encoding pulse sequence) to acquire time-averaged void fraction and velocity information about hydrodynamic cavitation for water flowing through a pipe constriction. (Source: Ma...
Source: Magnetic Resonance Imaging - January 2, 2018 Category: Radiology Authors: Alexander Adair, Igor V. Mastikhin, Benedict Newling Source Type: research
