Optimization of T2-weighted imaging for shoulder magnetic resonance arthrography by synthetic magnetic resonance imaging

2017 ◽  
Vol 59 (8) ◽  
pp. 959-965
Author(s):  
Seung Hyun Lee ◽  
Young Han Lee ◽  
Seok Hahn ◽  
Jaemoon Yang ◽  
Ho-Taek Song ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Supraspinatus Tendon ◽  
Joint Fluid ◽  
Resonance Imaging ◽  
Mr Images ◽  
Diagnostic Agreement ◽  
Tissue Contrast ◽  
Synthetic Images ◽  
Synthetic Mri

Background Synthetic magnetic resonance imaging (MRI) allows reformatting of various synthetic images by adjustment of scanning parameters such as repetition time (TR) and echo time (TE). Optimized MR images can be reformatted from T1, T2, and proton density (PD) values to achieve maximum tissue contrast between joint fluid and adjacent soft tissue. Purpose To demonstrate the method for optimization of TR and TE by synthetic MRI and to validate the optimized images by comparison with conventional shoulder MR arthrography (MRA) images. Material and Methods Thirty-seven shoulder MRA images acquired by synthetic MRI were retrospectively evaluated for PD, T1, and T2 values at the joint fluid and glenoid labrum. Differences in signal intensity between the fluid and labrum were observed between TR of 500–6000 ms and TE of 80–300 ms in T2-weighted (T2W) images. Conventional T2W and synthetic images were analyzed for diagnostic agreement of supraspinatus tendon abnormalities (kappa statistics) and image quality scores (one-way analysis of variance with post-hoc analysis). Results Optimized mean values of TR and TE were 2724.7 ± 1634.7 and 80.1 ± 0.4, respectively. Diagnostic agreement for supraspinatus tendon abnormalities between conventional and synthetic MR images was excellent (κ = 0.882). The mean image quality score of the joint space in optimized synthetic images was significantly higher compared with those in conventional and synthetic images (2.861 ± 0.351 vs. 2.556 ± 0.607 vs. 2.750 ± 0.439; P < 0.05). Conclusion Synthetic MRI with optimized TR and TE for shoulder MRA enables optimization of soft-tissue contrast.

scholarly journals Prognostic value of magnetic resonance imaging features in low-grade gliomas

2019 ◽  
Vol 39 (6) ◽  
Author(s):  
Liang Deng ◽  
Liangfang Shen ◽  
Lin Shen ◽  
Zhao Zhao ◽  
Yingpeng Peng ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Multivariate Analysis ◽  
Magnetic Resonance ◽  
Low Grade ◽  
Imaging Features ◽  
Resonance Imaging ◽  
Mr Images ◽  
Low Grade Gliomas ◽  
Kaplan Meier ◽  
Mri Features

AbstractIntroduction: The treatment strategy for low-grade gliomas (LGGs) is still controversial, and there are no standardized criteria to predict the prognosis of patients with LGGs. Magnetic resonance imaging (MRI) is a routine test for preoperative diagnosis for LGG and can reflect the destructive features for the tumor. In the present study, we aimed to explore the relationship between the MRI features and prognosis in patients with LGG.Methods: Clinical data of 80 patients with pathologically proved LGGs between January 2010 and December 2016 were analyzed retrospectively. MRI features were classified as contrast enhancement pattern (focal enhancement, diffuse enhancement and ring-like enhancement), necrosis and cysts based on the preoperative MR images. Kaplan–Meier method and multivariate analysis were performed on the data by SPSS software to explore the prognostic significance of MRI features.Results: Patients with cystic LGG had a significantly longer 5-year progression-free survival (PFS) than that with no cyst (90.9 ± 8.7 vs 65.7 ± 9.1%, P=0.045). Multivariate analysis further verified cyst as an independent prognosis factor for PFS (P=0.027, hazard ratio [HR] = 0.084). Additionally, patients with ring-like enhancement exhibited significantly longer 5-year PFS time in the Kaplan–Meier survival curves (100 vs 67.2 ± 7.7%, P=0.049). There was no significant difference in PFS and overall survival (OS) between patients with or without necrosis.Conclusion: Our study suggests that cyst formation and ring-like enhancement on preoperative MR images can be useful to predict a favorable prognosis in patients with LGGs.

scholarly journals Magnetic resonance imaging of salivary glands

2019 ◽  
Author(s):  
Danielle Ayumi Nishimura ◽  
Ana Luiza Esteves Carneiro ◽  
Kaisermann Costa ◽  
Wladimir Gushiken de Campos ◽  
Jefferson Xavier de Oliveira ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Salivary Glands ◽  
Imaging Techniques ◽  
Neck Region ◽  
Evaluation Instrument ◽  
Resonance Imaging ◽  
Tissue Contrast ◽  
Excellent Method ◽  
Magnetic Resonance Imaging Mri

Salivary glands tumors account for 2-5% of tumors in the head and neck region, possibly being benign or malignant. Magnetic resonance imaging (MRI) presents high soft tissue contrast resolution, thus being an excellent method for salivary gland analysis. The objective of this literature review is to analyze MRI as an evaluation instrument for the diagnosis of salivary glands lesions. Compared to other imaging techniques, MRI can better evaluate the relationship between adjacent anatomical structures, presenting greater sensitivity and specificity.

Magnetic resonance imaging and histologic features of the supraspinatus tendon in nonlame dogs

2018 ◽  
Vol 79 (8) ◽  
pp. 836-844
Author(s):  
Sarah L. Pownder ◽  
Brian G. Caserto ◽  
Kei Hayashi ◽  
Mary Lou Norman ◽  
Hollis G. Potter ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Supraspinatus Tendon ◽  
Resonance Imaging

Magnetic Resonance Imaging in the Evaluation of Occult Submucous Cleft Palate

2001 ◽  
Vol 38 (5) ◽  
pp. 421-431 ◽  
Author(s):  
David P. Kuehn ◽  
Sandra L. Ettema ◽  
Michael S. Goldwasser ◽  
Joseph C. Barkmeier ◽  
Jayne M. Wachtel
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Cleft Palate ◽  
Muscle Tissue ◽  
Speech Therapy ◽  
Treatment Decision ◽  
Levator Muscle ◽  
Resonance Imaging ◽  
Mr Images ◽  
Submucous Cleft Palate

Objective: To explore the application of magnetic resonance imaging (MRI) in the evaluation of patients with occult submucous cleft palate and to use the MRI information obtained to aid in the treatment decision to perform surgery versus behavioral speech therapy. Design: Prospective study with magnetic resonance (MR) images of subjects suspected of having occult submucous cleft palate. Setting: Hospital and university-based. Patients: Two girls who were 4 years old at the time of palatal surgery. Intervention: Furlow double-opposing Z-plasty. Main outcome measures: MR images and clinical speech evaluations. Results: MR images provided evidence of an interruption of levator veli palatini muscle tissue in the midline and a substantial attachment of levator muscle tissue to the posterior border of the hard palate. In addition, MR images for both subjects demonstrated remarkably similar bilateral encapsulating sheaths that contained nonmuscular tissue, as confirmed subsequently during surgery. The encapsulating sheaths interrupted the normal progression of the levator muscle sling across the midline. The MR images led to the decision to perform surgery instead of speech therapy. Hypernasality was markedly reduced in both subjects after surgery. Conclusions: MRI is an effective technique for diagnosing occult submucous cleft palate and may be an important aid in the treatment decision regarding surgery versus behavioral speech therapy for patients diagnosed with occult submucous cleft palate.

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.

Janus nanoparticles for contrast enhancement of T1–T2 dual mode magnetic resonance imaging

2019 ◽  
Vol 48 (3) ◽  
pp. 1075-1083 ◽  
Author(s):  
Kashmiri Deka ◽  
Anupam Guleria ◽  
Dinesh Kumar ◽  
Jayeeta Biswas ◽  
Saurabh Lodha ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Contrast Enhancement ◽  
Resonance Imaging ◽  
Mr Images ◽  
Dual Mode ◽  
Janus Nanoparticles

MnFe2O4@MnO Janus nanoparticles efficiently enhances contrast of both T1 and T2 based MR Images.

MAGNETIC RESONANCE IMAGING OF EPITHELIOID SARCOMA IN THE FOREARM: A CASE REPORT

Hand Surgery ◽  
1998 ◽  
Vol 03 (01) ◽  
pp. 151-154
Author(s):  
T. Ozaki ◽  
H. Hashizume ◽  
T. Kunisada ◽  
H. Inoue
Keyword(s):  
Magnetic Resonance Imaging ◽  
Case Report ◽  
Magnetic Resonance ◽  
Epithelioid Sarcoma ◽  
Resonance Imaging ◽  
Mr Images ◽  
Dynamic Mr

We report findings on plain, gadolinium (Gd) diethylenetriaminepentaaetic acid (DTPA) enhanced, and dynamic MR images of an epithelioid sarcoma in the forearm.

Magnetic Resonance Imaging of the Facial Nerve

1989 ◽  
Vol 101 (3) ◽  
pp. 295-301 ◽  
Author(s):  
Donald G. Wortham ◽  
Louis M. Teresi ◽  
Robert B. Lufkin ◽  
William N. Hanafee ◽  
Paul H. Ward
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Facial Nerve ◽  
Temporal Bone ◽  
Resonance Imaging ◽  
Mr Images ◽  
Beam Hardening ◽  
Parotid Tumors ◽  
Seventh Nerve ◽  
Magnetic Resonance Imaging Mri

Magnetic resonance imaging (MRI) of the facial nerve was evaluated by studying normal volunteers and patients with diseases of the facial nerve with a 0.3 Tesla permanent-magnet MRI system with special surface colls. The normal MR images were correlated with the anatomy of thin cryosection specimens of fresh cadavers. The seventh nerve was followed from its nucleus in the brainstem through the temporal bone to the parotid gland bed. The entire labyrinth and tympanic portions, as well as the geniculate ganglion, could be shown with appropriate scan planes. Examples of brainstem diseases affecting the facial nerve and nucleus, facial neuromas, parotid tumors involving the facial nerve, and other diseases were studied. MRI is a technique that allows unique evaluation of the entire course of the facial nerve. It produces superior Images of the facial nerve with high-contrast resolution. Unlike computed tomography, there is no beam-hardening artifact from the temporal bone or exposure to ionizing radiation and contrast agents. MRI also allows visualization of the main trunks of the facial nerve in the parotid bed not possible with any other imaging technique.

Individual variations in the sulcal anatomy of the basal temporal lobe and its relevance for epilepsy surgery: an anatomical study performed using magnetic resonance imaging

2002 ◽  
Vol 96 (3) ◽  
pp. 464-473 ◽  
Author(s):  
Klaus Novak ◽  
Thomas Czech ◽  
Daniela Prayer ◽  
Wolfgang Dietrich ◽  
Wolfgang Serles ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Temporal Lobe ◽  
Anatomical Landmarks ◽  
Resonance Imaging ◽  
Mr Images ◽  
Hippocampal Region ◽  
Content Type ◽  
Individual Variations ◽  
Fine Print

Object. The concept of selective amygdalohippocampectomy is based on pathophysiological insights into the epileptogenicity of the hippocampal region and the definition of the clinical syndrome of mesial temporal lobe epilepsy (TLE). High-resolution magnetic resonance (MR) imaging allows correlation of the site of histologically conspicuous tissue with anatomical structure. The highly variable sulcal pattern of the basal temporal lobe, however, definitely complicates the morphometric analysis of histomorphologically defined subdivisions of the hippocampal region. The goal of this study was to define individual variations in the sulcal anatomy on the basis of preoperative MR images obtained in patients suffering from TLE. Methods. The authors analyzed coronal MR images obtained in 50 patients for the presence of and intrinsic relationships among the rhinal, collateral, and occipitotemporal sulci. The surface relief of consecutive sections of 100 temporal lobes was graphically outlined and the resulting maps were used for visual analysis. The sulci were characterized by measurement of their depth, distance to the temporal horn, and laterality. The anatomical measurements and frequencies of sulcal patterns were assessed for statistical correlation with patients' histories and the lateralization of the seizure focus. Conclusions. Statistical assessment shows that patient sex is a significant factor in sulcal patterns. Anatomical measurements are significantly decreased on the side of the seizure origin, which relates to loss of white matter, a known morphological abnormality associated with TLE. Magnetic resonance imaging allows for accurate preoperative knowledge of individual sulcal patterns and facilitates intraoperative orientation to anatomical landmarks.

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