Accuracy of magnetic resonance imaging in differentiating between benign and malignant vertebral lesions: Role of Diffusion-weighted imaging, in-phase/opposed-phase imaging and apparent diffusion coefficient

2015 ◽  
Vol 57 (2) ◽  
pp. 142-149
Author(s):  
J. Martel Villagrán ◽  
Á. Bueno Horcajadas ◽  
E. Pérez Fernández ◽  
S. Martín Martín
Keyword(s):  
Magnetic Resonance Imaging ◽  
Diffusion Coefficient ◽  
Magnetic Resonance ◽  
Apparent Diffusion Coefficient ◽  
Diffusion Weighted Imaging ◽  
Phase Imaging ◽  
Resonance Imaging ◽  
Diffusion Weighted ◽  
Apparent Diffusion

Quantitative brain histogram of canine epilepsy using magnetic resonance imaging

2020 ◽  
pp. 028418512091403
Author(s):  
Somkiat Huaijantug ◽  
Paranee Yatmark ◽  
Phanupong Chinnabrut ◽  
Nutruja Rueangsawat ◽  
Avirut Wongkumlue ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Diffusion Coefficient ◽  
Magnetic Resonance ◽  
Apparent Diffusion Coefficient ◽  
Diffusion Weighted Imaging ◽  
Idiopathic Epilepsy ◽  
Resonance Imaging ◽  
Mr Images ◽  
Apparent Diffusion ◽  
The Brain

Background Quantitative magnetic resonance imaging (MRI) is used to study the anatomy of the brain in dogs with idiopathic epilepsy. Purpose To quantitate MRI images in terms of volumetric ratios and histogram analyses of the following regions of interest (ROI) in dogs with idiopathic epilepsy: frontal; parietal; temporal; piriform; thalamic; and hippocampal regions. Material and Methods Nine dogs with epilepsy and four healthy controls were evaluated. We examined the volumetric ratios and histogram analyses of six ROIs in all dogs. Results MR images, in T1-weighted, T2-weighted, FLAIR, diffusion-weighted imaging, and apparent diffusion coefficient sequences detected changes in 4/9 (44%) epileptic dogs found in 5/6 regions: frontal; parietal; temporal; piriform; and hippocampal regions. However, no such changes were observed in the thalamic region. Interestingly, the frontal and piriform volumetric ratios of epileptic dogs were significantly lower than those of control dogs. The histogram analyses in 4/6 regions were significantly increased in epileptic dogs. Conclusion Our results demonstrated MRI finding abnormalities in several regions of the brain in several sequences including T1-weighted, T2-weighted, FLAIR, diffusion-weighted imaging, and apparent diffusion coefficient in epileptic dogs. In several regions of the brain, atrophy may exist, and hyperintensity may be present on MR images in epileptic dogs. These findings suggest that the diagnostic yield of MRI, which is an advanced neuroimaging technique, is high in epileptic dogs and has good reliability and sensitivity in detecting abnormal areas in patients.

scholarly journals Measuring Restriction Sizes Using Diffusion Weighted Magnetic Resonance Imaging: A Review

2013 ◽  
Vol 6 ◽  
pp. MRI.S11149 ◽  
Author(s):  
Melanie Martin
Keyword(s):  
Magnetic Resonance Imaging ◽  
Diffusion Coefficient ◽  
Magnetic Resonance ◽  
Apparent Diffusion Coefficient ◽  
Spin Echo ◽  
Resonance Imaging ◽  
Free Diffusion ◽  
Diffusion Weighted ◽  
Apparent Diffusion ◽  
Weighted Magnetic Resonance Imaging

This article reviews a new concept in magnetic resonance as applied to cellular and biological systems. Diffusion weighted magnetic resonance imaging can be used to infer information about restriction sizes of samples being measured. The measurements rely on the apparent diffusion coefficient changing with diffusion times as measurements move from restricted to free diffusion regimes. Pulsed gradient spin echo (PGSE) measurements are limited in the ability to shorten diffusion times and thus are limited in restriction sizes which can be probed. Oscillating gradient spin echo (OGSE) measurements could provide shorter diffusion times so smaller restriction sizes could be probed.

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