scholarly journals Risonanza Magnetica della Mammella con i moderni scanner 3T: principi fisici e vantaggi tecnici rispetto alle apparecchiature 1,5 T

2019 ◽  
Author(s):  
Curatolo Calogero ◽  
Santoro Vincenzo
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Breast Imaging ◽  
High Field ◽  
Signal To Noise Ratio ◽  
Risonanza Magnetica ◽  
3 Tesla ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Study ◽  
Very High

In recent decades the Magnetic Resonance Imaging (MRI) world, for diagnostic uses, offered a very rapid and extremely dynamic and necessary technological evolution. Recently approved in Italy also for clinical use, in addition to the scientific one, the introduction of very high-field MRI, or 3 Tesla, provided considerable benefits. Therefore, the high magnetic field (3T) allows an increase in the signal-to-noise ratio (SNR) and in spatial and temporal resolution, and other several advantages. Certainly, there are some disadvantages, which can be found in the field of protectionism and safety, due to the increase in intensity of the static magnetic field and, specifically, to the increase in Specific Absorption Rate (SAR). Many applications of MRI improved significantly, among these, the brest MRI study, where the 3T magnetic field allows an increase of diagnostic accuracy in terms of specificity, providing a better visualization and characterization of breast lesions presenting post-contrastographic enhancement, so breast cancer and other lesions, showing a progressive better application field. Magnetic resonance is an emerging application with great potential, and the spread of very high-field scanners will allow 3 Tesla to become the excellence for many studies, especially in breast imaging.

scholarly journals A Hippocampal Lesion Detected by High-Field 3 Tesla Magnetic Resonance Imaging in a Patient with Temporal Lobe Epilepsy

2005 ◽  
Vol 205 (3) ◽  
pp. 287-291 ◽  
Author(s):  
Yukio Sawaishi ◽  
Makoto Sasaki ◽  
Tamami Yano ◽  
Aya Hirayama ◽  
Jinzo Akabane ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Temporal Lobe Epilepsy ◽  
Temporal Lobe ◽  
Hippocampal Lesion ◽  
High Field ◽  
3 Tesla ◽  
Resonance Imaging

T1672 The Effects of Endogenous GLP-1 On Antro-Duodenal Contractility in the Fasted and Fed State: A Magnetic Resonance Imaging (MRI) Study

2009 ◽  
Vol 136 (5) ◽  
pp. A-555
Author(s):  
Elad Kaufman ◽  
Mark Fox ◽  
Michael Wyss ◽  
Zsofia Forras-Kaufman ◽  
Reto Treier ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Fed State ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Study

scholarly journals Accuracy of Two-dimensional Ultrasound and Magnetic Resonance Imaging in Diagnosis of Foetal Congenital Anomalies in a Tertiary Care Hospital- A Cross-sectional Study

2021 ◽  
Author(s):  
Jaybrata Ray ◽  
Jaharlal Baidya ◽  
Tanusri Debbarma ◽  
Jobin Joy
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Congenital Anomalies ◽  
High Field ◽  
Cross Sectional Study ◽  
3 Tesla ◽  
Sectional Study ◽  
Resonance Imaging ◽  
Cross Sectional ◽  
3 Tesla Mri

Introduction: Ultrasound screening for foetus congenital malformations is the mainstay in diagnosis and is commonly performed at 19-22 weeks gestation. Magnetic Resonance Imaging (MRI) is known as a problem solving tool which is used for answering a specific question. Both ultrasound and foetus MRI are highly sensitive and specific in diagnosis of congenital anomalies of the foetus with high agreement between both modalities. Aim: To determine the accuracy of Ultrasound Sonography (USG) and High Field 3 tesla MRI in diagnosis of different types of foetal Central Nervous System (CNS) and non CNS congenital abnormalities. Materials and Methods: A cross-sectional study was conducted in the Department of Radiodiagnosis at Agartala Government Medical College and GB Pant Hospital from June 2017 to May 2019. A total of 65 cases with ultrasound diagnosis of foetus abnormalities were examined by 3 Tesla MRI. MRI were performed within 15 days after USG detected anomalies. Statistical analysis was done using Chi-square test. Results: In cases with foetus anomalies high field MRI provided detailed findings leading to a more refined diagnosis. CNS anomalies were more as compared to other anomalies. Some of the antenatal findings were confirmed in some cases following termination of pregnancy and some were by postnatal examination. Among them chest anomalies was least common i.e., 1.5%. sensitivity of MRI was 88.13%, specificity was 66.66%, Positive Pressure Ventilation (PPV) was 96.29%, Negative Predictive Value (NPV) was 36.36% and USG sensitivity was 82.43%, specificity and 77.77%, PPV was 95.83%and NPV was 41.17%. Conclusion: High field MRI should be used as a second line of investigation in patients with foetus abnormalities diagnosed by ultrasound for confirmation of diagnosis and selecting the treatment protocol. In cases of fatal abnormalities, a confirmed diagnosis made before 20 weeks of pregnancy may help by terminating the pregnancy.

scholarly journals High-Field Pulsed ENDOR with Intra-cavity Radiofrequency Coil

2020 ◽  
Vol 51 (11) ◽  
pp. 1433-1449
Author(s):  
G. Annino ◽  
H. Moons ◽  
M. Fittipaldi ◽  
S. Van Doorslaer ◽  
E. Goovaerts
Keyword(s):  
Magnetic Field ◽  
High Field ◽  
Conversion Factor ◽  
Signal To Noise Ratio ◽  
Model Systems ◽  
Signal To Noise ◽  
Radiofrequency Coil ◽  
W Band ◽  
Radiofrequency Current ◽  
Field Uniformity

AbstractThis study compares the performance of two coil configurations for W-band pulsed ENDOR using a setup with both a radiofrequency ‘hairpin’ coil internal to a microwave non-radiative resonator and Helmholtz-like coils external to the resonator. Evaluation of the different coil performances is achieved via the ENDOR study of two model systems. The efficiencies of the coil configurations are first investigated numerically, showing that a higher radiofrequency current-to-magnetic field conversion factor can be achieved with the intra-cavity coil, with a similar radiofrequency magnetic field uniformity. This result is then confirmed by the broadband ENDOR spectra acquired with the two coil arrangements. A gain in the signal-to-noise ratio enabled by the internal coil of about a factor 10 was observed. In some cases, the high conversion factor of the intra-cavity coil led to a saturation of the ENDOR transitions. The possibility to implement a similar intra-cavity radiofrequency coil configuration in higher field spectrometers is finally discussed.

Clinical and Magnetic Resonance Imaging Predictors of Disability in Primary and Secondary Progressive Multiple Sclerosis

1996 ◽  
Vol 1 (4) ◽  
pp. 218-222 ◽  
Author(s):  
NA Losseff ◽  
DPE Kingsley ◽  
WI McDonald ◽  
DH Miller ◽  
AJ Thompson
Keyword(s):  
Magnetic Resonance Imaging ◽  
Multiple Sclerosis ◽  
Magnetic Resonance ◽  
Initial Study ◽  
Progressive Multiple Sclerosis ◽  
Resonance Imaging ◽  
Secondary Progressive ◽  
Short Period ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Study

The role of magnetic resonance imaging (MRI) in predicting disability in multiple sclerosis (MS) remains unclear. In this study 21 patients with primary and secondary progressive MS were reviewed 5 years following a serial MRI study of 6 months duration. In the secondary progressive group (n=11) there was a significant relationship between the occurrence of enhancing lesions and clinical relapses during the initial 6 months and increase in diability 5 years later. For both groups change in disability over the initial study period was predictive of outcome. These results suggest that the presence and frequency of gadolinium enhancement (a marker of inflammation) and changes in disability over a short period are predictive of future deterioration in progressive patients.

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