Coronal oblique proton density weighted magnetic resonance imaging of the right shoulder

Objectives: Conventional ultrasonography can provide only semi-quantitative assessment of hepatic steatosis. The aim of this study was to assess sonographic hepatorenal ratio to quantify the severity of fatty liver. Methods: We performed a retrospective analysis of 179 patients with various liver diseases who underwent abdominal magnetic resonance imaging and ultrasonography on the same day. The hepatorenal ratio was calculated by the ratio between the mean echo intensity in regions of interests of the liver and regions of interests of the right renal cortex. Magnetic resonance imaging-proton density fat fraction was used as standard reference for steatosis grading. The effect of fibrosis measured by magnetic resonance elastography on the degree of correlation was also assessed. Results: The hepatorenal ratio was highly correlated with magnetic resonance imaging-proton density fat fraction (Spearman’s coefficient = 0.83) (p <0.001). High correlation of hepatorenal ratio with magnetic resonance imaging-proton density fat fraction was observed in patients with less than stage 2 fibrosis (p <0.001), whereas moderate correlation of hepatorenal ratio with magnetic resonance imaging-proton density fat fraction was found in patients with ≥ stage 2 fibrosis or higher (p <0.001). The hepatorenal ratio cutoff point for prediction of grade 1 hepatic steatosis was 1.18 with sensitivity of 90.0% and specificity of 80.0%. The hepatorenal ratio cutoff point for prediction of grade 2 and grade 3 hepatic steatosis was 1.55 and 1.60, respectively, with sensitivity greater than 90% and specificity greater than 80%. Conclusions: The hepatorenal ratio could become an effective quantitative tool for hepatic steatosis alternative to magnetic resonance imaging-proton density fat fraction. Application should be careful in the group of patients with stage 2 liver fibrosis or higher.

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Characteristics of wooden intraocular foreign body by magnetic resonance imaging in rabbits

Journal of International Medical Research ◽

10.1177/0300060518796388 ◽

2018 ◽

Vol 46 (11) ◽

pp. 4717-4721

Author(s):

Baohong Wen ◽

Jingliang Cheng ◽

Huixia Zhang ◽

Yong Zhang ◽

Xiaonan Zhang ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Foreign Body ◽

Magnetic Resonance ◽

Intraocular Foreign Body ◽

Proton Density ◽

Resonance Imaging ◽

Integrated Diagnosis ◽

Mri Sequences ◽

Magnetic Resonance Imaging Mri ◽

The Right

Objective Intraocular foreign body (IOFB), a frequent cause of ocular trauma, causes serious damage to the eyes. This study was designed to elaborate and compare the characteristics of different magnetic resonance imaging (MRI) sequences in detecting wooden IOFBs in rabbits. Methods The right vitreous of 24 healthy rabbits was randomly implanted with diverse wooden foreign bodies (diameter φ = 0.2 mm). The T1-weighted imaging (T1WI), T2-weighted imaging (T2WI), proton density-weighted imaging (PDWI), and susceptibility-weighted imaging (SWI) sequences were applied individually 2 weeks after the implantation. Results IOFBs were detected as linear low signals on T1WI, T2WI, PDWI, and SWI (SWI image). The detectable rates of poplar wood with a length of 0.5 mm were 0%, 50%, 0%, and 67% for T1WI, T2WI, PDWI, and SWI, respectively. SWI and T2WI sequences exhibited higher sensitivity than T1WI and PDWI. The detectable rates of the first three SWI sequences (magnitude, phase, and SWI) were all 67%, which was higher than that of the minimum intensity projection sequence (33%). Conclusion MRI is practicable in the diagnosis of wooden IOFBs. SWI and T2WI are optimal for the integrated diagnosis of wooden IOFBs and could be used for diagnosis and immediate treatment.

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Transient global amnesia: increased signal intensity in the right hippocampus on diffusion-weighted magnetic resonance imaging

Neuroradiology ◽

10.1007/s002340100699 ◽

2002 ◽

Vol 44 (3) ◽

pp. 235-238 ◽

Cited By ~ 24

Author(s):

M. Matsui ◽

T. Imamura ◽

S. Sakamoto ◽

K. Ishii ◽

H. Kazui ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Signal Intensity ◽

Transient Global Amnesia ◽

Resonance Imaging ◽

Diffusion Weighted ◽

Weighted Magnetic Resonance Imaging ◽

Global Amnesia ◽

The Right

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Delineation of the Nucleus Centre Median by Proton Density Weighted Magnetic Resonance Imaging at 3 T

Operative Neurosurgery ◽

10.1227/01.neu.0000348560.85056.63 ◽

2010 ◽

Vol 66 (suppl_1) ◽

pp. ons-E121-ons-E123 ◽

Cited By ~ 3

Author(s):

Martin Kanowski ◽

Jürgen Voges ◽

Claus Tempelmann

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Healthy Subjects ◽

Therapeutic Potential ◽

Spin Echo ◽

Proton Density ◽

Slice Thickness ◽

Resonance Imaging ◽

Stereotactic Neurosurgery ◽

Weighted Magnetic Resonance Imaging

Abstract Objective: To demonstrate that proton density weighted magnetic resonance imaging (MRI) at 3 T accomplishes delineation of the centre median (CM) complex from surrounding thalamic tissue and may improve targeting accuracy in stereotactic neurosurgery. Methods: Five healthy subjects (1 man, 4 women; age range 22–35 years) underwent high-resolution MRI at 3 T with different imaging parameters in order to optimize the direct visualization of the CM. Results: In healthy subjects, the CM complex of the thalamus can be reliably contrasted on axially oriented slices by means of proton density weighted turbo-spin-echo MRI. An in-plane resolution of at least 0.6 × 0.6 mm2 is crucial at a slice thickness between 2 and 3 mm. Effective suppression of head motion is essential. Conclusion: MRI-based delineation of the CM could have therapeutic potential to facilitate target determination for neuromodulation in stereotactic neurosurgery.

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