scholarly journals Do magnetic resonance training in spondyloarthritis improve the performance of rheumatologists for the recognition of sequences and lesions?

2020 ◽  
pp. 8-11
Author(s):  
Rodrigo Garcia Salinas ◽  
Josefina Marin ◽  
Gabriel Aguilar ◽  
Dario Aguerre ◽  
Santiago Ruta ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Axial Spondyloarthritis ◽  
Individual Characteristics ◽  
Theoretical Knowledge ◽  
Resonance Imaging ◽  
Physician Characteristics ◽  
Before And After ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Image

Introduction: Magnetic resonance imaging (MRI) is a fundamental diagnostic tool in axial spondyloarthritis, it has allowed us, unlike radiography, to diagnose this pathology much earlier. Objective: To estimate the percentage of correct answers in the recognition of SpA MRI lesions and theoretical knowledge, before and after performing an educational intervention. Estimate if the good performance in the tests is associated with individual characteristics of the doctors. Methods: A test was carried out with 10 questions (7 for image recognition and 3 for theoretical knowledge) before and after the development of an MRI image workshop in EspA in diferents cities in Argentina. The correct response number was considered before and after the workshop, and those who achieved more than 12 points between the two evaluations were considered good performance. The following physician characteristics were collected. Results: A total of 106 physicians were evaluated. The results of the tests (total 10 questions) before and after the workshop were 53% and 68% correct, respectively (p:0.000). 65% of the physicians achieved a good performance (more than 12 correct).

Detection of Erosions in Sacroiliac Joints of Patients with Axial Spondyloarthritis Using the Magnetic Resonance Imaging Volumetric Interpolated Breath-hold Examination

2019 ◽  
Vol 46 (11) ◽  
pp. 1445-1449 ◽  
Author(s):  
Xenofon Baraliakos ◽  
Florian Hoffmann ◽  
Xiaohu Deng ◽  
Yan-Yan Wang ◽  
Feng Huang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Structural Changes ◽  
Axial Spondyloarthritis ◽  
Linear Regression Analysis ◽  
Cartilage Defects ◽  
Breath Hold ◽  
Resonance Imaging ◽  
Sacroiliac Joints ◽  
Magnetic Resonance Imaging Mri

Objective.The volumetric interpolated breath-hold examination (VIBE) magnetic resonance imaging (MRI) technique can visualize erosive cartilage defects in peripheral joints. We evaluated the ability of VIBE to detect erosions in sacroiliac joints (SIJ) of patients with axial spondyloarthritis (axSpA) compared to the established T1-weighted MRI sequence and computed tomography (CT).Methods.MRI (T1-weighted and VIBE) and CT scans of SIJ of 109 patients with axSpA were evaluated by 2 blinded readers based on SIJ quadrants (SQ). Erosions were defined according to Assessment of Spondyloarthritis international Society (ASAS) definitions. Scores were recorded if readers were in agreement.Results.Erosions were less frequently detected by CT (153 SQ) than by T1-weighted MRI (182 SQ; p = 0.008) and VIBE-MRI (199 SQ; p < 0.001 vs CT and p = 0.031 vs T1-weighted MRI). Taking CT as the gold standard, the sensitivity of VIBE-MRI (71.2%) was higher than that for T1-weighted MRI (63.4%), with similar specificity (87.3% vs 88%, respectively). In linear regression analysis, younger age was significantly associated with occurrence of erosions independently in VIBE-MRI (β = 0.384, p < 0.001) and T1-weighted MRI (β = 0.369, p < 0.001) compared to CT.Conclusion.The VIBE-MRI sequence was more sensitive than T1-weighted MRI in identifying erosive damage in the SIJ, especially in younger patients. This might be due to the ability of VIBE-MRI to identify structural changes in the cartilage that have not yet extended to the underlying bone, where CT seems to be superior.

Using Tomographic Medical Images as Objects of Portrait Examination

2019 ◽  
pp. 142-145
Author(s):  
G. V. Cherepenko
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Medical Images ◽  
Resonance Imaging ◽  
Examination Technique ◽  
Magnetic Resonance Imaging Mri ◽  
Practical Recommendations ◽  
Mri Image ◽  
Expert Practice

The paper provides an example from expert practice, during which a head image obtained using magnetic resonance imaging (MRI) was used as a sample. It is proposed to include an MRI image in a number of objects and samples considered by the current portrait examination technique. The nature of the suitability of such an object for the production of portrait examination is determined. Practical recommendations are given for working with the appropriate software to get the most visual picture.

scholarly journals MRI image analysis methods and applications: an algorithmic perspective using brain tumors as an exemplar

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Vachan Vadmal ◽  
Grant Junno ◽  
Chaitra Badve ◽  
William Huang ◽  
Kristin A Waite ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computer Vision ◽  
Image Analysis ◽  
Magnetic Resonance ◽  
Brain Tumors ◽  
Computational Techniques ◽  
Complex Nature ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Image

Abstract The use of magnetic resonance imaging (MRI) in healthcare and the emergence of radiology as a practice are both relatively new compared with the classical specialties in medicine. Having its naissance in the 1970s and later adoption in the 1980s, the use of MRI has grown exponentially, consequently engendering exciting new areas of research. One such development is the use of computational techniques to analyze MRI images much like the way a radiologist would. With the advent of affordable, powerful computing hardware and parallel developments in computer vision, MRI image analysis has also witnessed unprecedented growth. Due to the interdisciplinary and complex nature of this subfield, it is important to survey the current landscape and examine the current approaches for analysis and trend trends moving forward.

scholarly journals Effect of an Insulation Device in Preventing Hypothermia during Magnetic Resonance Imaging Examinations for Dogs and Cats under General Anesthesia

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2378
Author(s):  
Eri Onozawa ◽  
Daigo Azakami ◽  
Seri Seki ◽  
Yuji Hamamoto ◽  
Katsumi Ishioka
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
General Anesthesia ◽  
Room Temperature ◽  
The Body ◽  
Body Temperatures ◽  
Resonance Imaging ◽  
Control Groups ◽  
Before And After ◽  
Magnetic Resonance Imaging Mri

Dogs and cats under general anesthesia may develop hypothermia. When performing a magnetic resonance imaging (MRI) examination, it is not possible to place a magnetic material in the MRI room, and MRI equipment requires a low room temperature. This study investigated the effectiveness of a heat insulating device that prevented hypothermia during MRI examinations in dogs and cats. The animals that underwent MRI examinations under general anesthesia were divided into control groups (no covering) and heat insulating groups (wearing bubble wrap and down cloth blankets), and their body temperatures were measured before and after the MRI examinations. The changes in body temperatures were as follows: control dogs (n = 17), median of −1.0 (from −2.5 to 0.3) °C; heat insulated dogs (n = 7), −0.3 (from −0.8 to 0.2) °C; control cats (n = 14), −1.85 (from −2.7 to −0.6) °C; and heat insulated cats (n = 12), −0.8 (from −1.5 to −0.1) °C. These results revealed that the bubble wrap and down cloth blanket significantly prevented hypothermia and heat loss from the body surface during MRI examinations of dogs and cats.

scholarly journals Texture analysis of orbital magnetic resonance imaging for monitoring and predicting treatment response to glucocorticoid in patients with thyroid-associated ophthalmopathy

2021 ◽  
Author(s):  
Yue-Yue Wang ◽  
Qian Wu ◽  
Lu Chen ◽  
Wen Chen ◽  
Tao Yang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Texture Analysis ◽  
Disease Duration ◽  
Clinical Activity ◽  
Resonance Imaging ◽  
Thyroid Associated Ophthalmopathy ◽  
Before And After ◽  
Magnetic Resonance Imaging Mri ◽  
Optimal Efficiency

Purpose: To evaluate the value of magnetic resonance imaging (MRI)-based texture analysis of extraocular muscle (EOM) and orbital fat (OF) in monitoring and predicting the response to glucocorticoid (GC) therapy in patients with thyroid-associated ophthalmopathy (TAO). Methods: Thirty-seven active and moderate-to-severe TAO patients (responders, n=23; unresponders, n=14) were retrospectively enrolled. MRI-based texture parameters (entropy, uniformity, skewness and kurtosis) of EOM and OF were measured before and after GC therapy, and compared between groups. Correlations between the changes of clinical activity score (CAS) and imaging parameters before and after treatment were assessed. Receiver operating characteristic curves were used to evaluate the predictive value of identified variables. Results: Responsive TAOs showed significantly decreased entropy and increased uniformity at EOM and OF after GC therapy (p<0.01), while unresponders showed no significance. Changes of entropy and uniformity at EOM and OF were significantly correlated with changes of CAS before and after treatment (p<0.05). Responders showed significantly lower entropy and higher uniformity at EOM than unresponders before treatment (p<0.01). Entropy and uniformity of EOM and disease duration were identified as independent predictors for responsive TAOs. Combination of all three variables demonstrated optimal efficiency (area under curve, 0.802) and sensitivity (82.6%), and disease duration alone demonstrated optimal specificity (100%) for predicting responsive TAOs. Conclusion: MRI-based texture analysis can reflect histopathological heterogeneity of orbital tissues. It could be useful for monitoring and predicting the response to GC in TAO patients.

Synthesis of Zn-Doped Manganese Ferrite Nanoparticles Via Coprecipitation Method for Magnetic Resonance Imaging Contrast Agent

2014 ◽  
Vol 5 (4) ◽  
Author(s):  
Firooz Salehpour ◽  
Ainaz Khorramdin ◽  
Hooman Shokrollahi ◽  
Arastoo Pezeshki ◽  
Farhad Mirzaei ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Magnetite Nanoparticles ◽  
Lattice Parameter ◽  
Coprecipitation Method ◽  
Material Structure ◽  
Resonance Imaging ◽  
Before And After ◽  
Magnetic Resonance Imaging Contrast ◽  
Magnetic Resonance Imaging Mri

Two different preparations of biocompatible magnetic nanoparticles (MNPs), both (MnFe2O4 and Mn0.91Zn0.09Fe2O4) coated with methoxy polyethylene glycol aldehyde (m-PEG-CHO) were prepared through coprecipitation method. The prepared powder was reanalyzed for material structure with an X-ray diffractometer (XRD) and for particle size using a transition electron microscope (TEM). Magnetic saturation (MS) and coercivity (HC) of the formed particles were examined by a vibrating sample magnetometer (VSM). Surface structure of the samples was characterized by Fourier transform infrared spectroscopy (FTIR). Biocompatible ferrofluids were intravenously injected into four rabbits. Then the magnetic resonance (MR) images of brain were obtained by magnetic resonance imaging (MRI) experiments before and after intravenous injection of ferrofluids. The MNPs demonstrate super paramagnetic behavior with a spinel structure measuring 30–40 nm in size. Doping of these magnetite nanoparticles with zinc resulted in decreases in crystallite size from 24.23 nm to 21.15 nm, the lattice parameter from 8.45 Å to 8.43 Å and the coercivity from 41.20 Oe to 13.07 Oe. On the other hand, saturation magnetization increased from 50.12 emu/g to 57.36 emu/g following zinc doping. Image exposure analysis revealed that the reduction of MR signal intensity for zinc-doped magnetite nanoparticles was more than nondoped nanoparticles (shorter T2 relaxation time) thereby making the images darker.

Sign in / Sign up

Export Citation Format

Share Document