Qualitative and quantitative diagnosis of intramuscular hemangioma subtypes: Diagnostic performance comparison of ESWAN and conventional MRI

2021 ◽  
pp. 028418512110651
Author(s):  
Jun Du ◽  
Kun Li ◽  
Wei Wang ◽  
Felix Young Jhonatan ◽  
Weisheng Zhang ◽  
...  
Keyword(s):  
Capillary Hemangioma ◽  
Performance Comparison ◽  
Resonance Imaging ◽  
Quantitative Diagnosis ◽  
Qualitative And Quantitative ◽  
Conventional Mri ◽  
Significant Difference ◽  
Cavernous Hemangiomas ◽  
Intramuscular Hemangioma ◽  
Magnetic Resonance Imaging Mri

Background Preoperative identification of intramuscular hemangioma (IMH) subtypes (capillary hemangioma, cavernous hemangioma, and mixed hemangioma) is urgently necessary. Enhanced T2*-weighted angiography (ESWAN) is sensitive to vessels and metabolites and can be used to diagnose IMH subtypes. Purpose To compare the diagnostic performances of ESWAN and conventional magnetic resonance imaging (MRI) for qualitative and quantitative diagnosis of IMH subtypes. Material and Methods In total, 23 patients with IMHs were examined using conventional MRI and ESWAN. The signal intensity ratios (SIRs) of conventional MRI and ESWAN were measured. Results There was no significant difference for volume among the three subtypes ( P = 0.124, P = 0.145). Various shapes and MRI signals were shown in the three subtypes of IMH. There was no significant difference for SIRs of conventional MRI ( P = 0.558, P = 0.259, P = 0.385, P = 0.347). However, there was a significant difference for SIRs of ESWAN parameters ( P = 0.050, P < 0.001, P = 0.005, P = 0.002). Capillary hemangiomas can be diagnosed when R2* SIR is <0.912 and intratumoral susceptibility signal (ITSS) percentage is <29.085%. Cavernous hemangiomas should be considered when R2* SIR is >0.912, ITSS percentage >35.226%, and phase SIR >2.536. In addition, mixed hemangiomas should be considered when T2* SIR is >0.662 and R2* SIR <1.618. Conclusion Conventional MRI can only display the volume, shape, and signal of IMHs. 3D-MinIP imaging of ESWAN can show the veins and minor hemorrhage. SIRs of ESWAN parameters including T2* value, R2* value, phase value, and percentage of ITSS can be used to quantitatively diagnose capillary hemangiomas, cavernous hemangiomas, and mixed hemangiomas.

Systematic Analysis and Review of Magnetic Resonance Imaging (MRI) Reconstruction Techniques

2021 ◽  
Vol 16 ◽  
Author(s):  
Penta Anil Kumar ◽  
R. Gunasundari ◽  
R. Aarthi
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Optimization Technique ◽  
Motion Artifacts ◽  
Reconstruction Technique ◽  
Resonance Imaging ◽  
Research Gaps ◽  
Conventional Mri ◽  
Mri Reconstruction ◽  
Magnetic Resonance Imaging Mri

Background: Magnetic Resonance Imaging (MRI) plays an important role in the field of medical diagnostic imaging as it poses non-invasive acquisition and high soft-tissue contrast. However, the huge time is needed for the MRI scanning process that results in motion artifacts, degrades image quality, misinterpretation of data, and may cause uncomfortable to the patient. Thus, the main goal of MRI research is to accelerate data acquisition processing without affecting the quality of the image. Introduction: This paper presents a survey based on distinct conventional MRI reconstruction methodologies. In addition, a novel MRI reconstruction strategy is proposed based on weighted Compressive Sensing (CS), Penalty-aided minimization function, and Meta-heuristic optimization technique. Methods: An illustrative analysis is done concerning adapted methods, datasets used, execution tools, performance measures, and values of evaluation metrics. Moreover, the issues of existing methods and the research gaps considering conventional MRI reconstruction schemes are elaborated to obtain improved contribution for devising significant MRI reconstruction techniques. Results: The proposed method will reduce conventional aliasing artifacts problems, may attain lower Mean Square Error (MSE), higher Peak Signal-to-Noise Ratio (PSNR), and Structural SIMilarity (SSIM) index. Conclusion: The issues of existing methods and the research gaps considering conventional MRI reconstruction schemes are elaborated to devising an improved significant MRI reconstruction technique.

scholarly journals Can diffusion and T2 star-weighted magnetic resonance imaging aid in the diagnosis of ectopic endometrium?

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Mariam Raafat ◽  
Soha H. Talaat ◽  
Salma M. Abdelghaffar ◽  
Engy A. Ali
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Statistical Significance ◽  
P Value ◽  
Large Sample Size ◽  
Resonance Imaging ◽  
Conventional Mri ◽  
Patient Will ◽  
Magnetic Resonance Imaging Mri ◽  
Ectopic Endometrium

Abstract Background Endometriosis is a common gynecologic disorder characterized by the implantation of the endometrial tissue ectopically outside the endometrial cavity. It affects about 10% of females at the childbearing period and is estimated to be present up to 20–50% in women complaining of infertility. While laparoscopy is considered the mainstay for diagnosis, magnetic resonance imaging (MRI) is recognized as a useful tool for definitive diagnosis, pre-surgical planning, and determining whether the patient will require multi-specialty involvement. The aim of this study is to evaluate the performance of MRI with the addition of diffusion-weighted imaging (DWI) and T2 star (T2*) to conventional MRI, for the accurate assessment of ectopic endometrium. Results Endometriotic lesions that showed diffusion restriction on DWI were 80.7%, and 96.1% of the endometriotic lesions had signal voids on the T2*W sequence, whereas only 65.4% of the lesions had typical signal intensities on T1WI and T2WI. Diagnostic performance of the MRI examination was improved by the use of the diffusion sequence and better improved by the T2* sequence, compared to the conventional MR protocol sensitivity (SE) = 96.12% and specificity (SP) = 85.7% in T2*-weighted images, SE = 80.7% and SP = 71.4% in DWI, and SE = 65.4% and SP = 71.4% in conventional MRI. P value for conventional MRI was 0.1, which is of no statistical significance (p < 0.05). P value for DWI was 0.016, which is statistically significant (p < 0.05). P value for T2*WI was 0.001, which is more statistically significant (p < 0.05) and could be adequately correlated with laparoscopy. Conclusion DWI and T2* significantly increase MRI diagnostic accuracy by allowing the detection of the hemorrhagic character of the endometriotic lesions. Studies with a large sample size are needed to confirm that they can replace invasive laparoscopy for the diagnosis of endometriosis.

scholarly journals Thickening of spine ligamentum flavum and facet tropism

2014 ◽  
Vol 13 (1) ◽  
pp. 39-42 ◽  
Author(s):  
Paulo Roberto Appolonio ◽  
Thiago Mattar ◽  
Alexandre Barros Costa ◽  
Edgar Santiago Valesin Filho ◽  
Luciano Miller Reis Rodrigues
Keyword(s):  
Magnetic Resonance Imaging ◽  
Spinal Surgery ◽  
Positive Relationship ◽  
Ligamentum Flavum ◽  
Chronic Back Pain ◽  
Resonance Imaging ◽  
Significant Difference ◽  
Magnetic Resonance Imaging Mri ◽  
Facet Tropism ◽  
Different Levels

OBJECTIVE: This study investigated the thickening of the ligamentum flavum (LF) and its correlation with facet tropism and its severity at different levels of the spine. METHOD: This retrospective study was performed with patients with chronic back pain consecutively admitted to a specialized spinal surgery service between January 2012 and January 2013. All patients underwent magnetic resonance imaging (MRI) to measure the thickness of the LF and facet tropism severity (severe, moderate or absent) according to the spine levels (L3 -L4, L4-L5, L5-S1). The association between the thickness of LF and facet tropism was analyzed. RESULTS: During the study period, 98 consecutive patients were enrolled with a mean age of 53.6 years, most women (59.2%). There was no significant difference between the thicknesses of the ligament and the presence of tropism in different spinal levels (p > 0.05). The thickness of LF was significantly associated with the severity of tropism only in L5-S1 level (p < 0.03). CONCLUSIONS: Our results show that there is a positive relationship between severe facet tropism and increased thickness of the LF in the L5-S1 level.

Mixing and Segregation Processes in Turbula Blender

2000 ◽  
Vol 627 ◽  
Author(s):  
Nathalie Sommier ◽  
Patrice Porion ◽  
Pierre Evesque
Keyword(s):  
Rotation Speed ◽  
Mixing Time ◽  
Qualitative And Quantitative Analysis ◽  
Resonance Imaging ◽  
Mixing Processes ◽  
Segregation Index ◽  
Qualitative And Quantitative ◽  
Magnetic Resonance Imaging Mri ◽  
Different Diameters ◽  
Kinetics Of

ABSTRACTMagnetic Resonance Imaging (MRI) technique was used to study the mixing and segregation processes of granular materials in a sophisticated tumbling blender (Turbula® mixer) using binary mixtures of sugar beads of different diameters d. Its motion generates mixtures with complex patterns. Effects of some parameters (beads diameter ratio, rotation speed, mixing time) were checked on segregation and mixing processes. We report in this paper, a qualitative and quantitative analysis of these phenomena. A segregation index S was defined to study the homogeneity and the kinetics of the mixing/segregation processes. When the ratio of bead diameters dmax/dmin is approximately 1, mixing process is observed but segregation occurs as soon as dmax/dmin is greater than 1.1.

Brain magnetic resonance imaging does not contribute to the diagnosis of chronic neuroborreliosis

2007 ◽  
Vol 48 (7) ◽  
pp. 755-762 ◽  
Author(s):  
A. Aalto ◽  
J. Sjöwall ◽  
L. Davidsson ◽  
P. Forsberg ◽  
Ö. Smedby
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Disease Duration ◽  
Brain Magnetic Resonance Imaging ◽  
White Matter Lesions ◽  
Resonance Imaging ◽  
Mri Findings ◽  
Significant Difference ◽  
Fluid Attenuated Inversion Recovery ◽  
Magnetic Resonance Imaging Mri

Background: Borrelia infections, especially chronic neuroborreliosis (NB), may cause considerable diagnostic problems. This diagnosis is based on symptoms and findings in the cerebrospinal fluid but is not always conclusive. Purpose: To evaluate brain magnetic resonance imaging (MRI) in chronic NB, to compare the findings with healthy controls, and to correlate MRI findings with disease duration. Material and Methods: Sixteen well-characterized patients with chronic NB and 16 matched controls were examined in a 1.5T scanner with a standard head coil. T1- (with and without gadolinium), T2-, and diffusion-weighted imaging plus fluid-attenuated inversion recovery (FLAIR) imaging were used. Results: White matter lesions and lesions in the basal ganglia were seen in 12 patients and 10 controls (no significant difference). Subependymal lesions were detected in patients down to the age of 25 and in the controls down to the age of 43. The number of lesions was correlated to age both in patients (ρ = 0.83, P<0.01) and in controls (ρ = 0.61, P<0.05), but not to the duration of disease. Most lesions were detected with FLAIR, but many also with T2-weighted imaging. Conclusion: A number of MRI findings were detected in patients with chronic NB, although the findings were unspecific when compared with matched controls and did not correlate with disease duration. However, subependymal lesions may constitute a potential finding in chronic NB.

Neuroimaging Techniques and Their Application in the Spinal Cord

2016 ◽  
Vol 2 (4) ◽  
pp. 211-214
Author(s):  
Yong Hu
Keyword(s):  
Spinal Cord ◽  
Neural Function ◽  
Functional Information ◽  
Resonance Imaging ◽  
Spinal Disorders ◽  
Human Spinal Cord ◽  
Non Invasive ◽  
Conventional Mri ◽  
Magnetic Resonance Imaging Mri ◽  
Neuroimaging Techniques

Non-invasive neuroimaging plays a crucial role in the assessment of the human spinal cord, but it is quite challenging. Magnetic resonance imaging (MRI) is an important modality to obtain both high-resolution anatomical and functional information concerning the spinal cord. Besides conventional MRI, advanced MRI techniques could provide novel information about the microstructure and neural function of the spinal cord, thereby enhancing the understanding of spinal cord neurology and pathology of various spinal disorders.

3D MRI of the Hip Joint: Technical Considerations, Advantages, Applications, and Current Perspectives

2021 ◽  
Vol 25 (03) ◽  
pp. 488-500
Author(s):  
Oganes Ashikyan ◽  
Joel Wells ◽  
Avneesh Chhabra
Keyword(s):  
Acetabular Dysplasia ◽  
Three Dimensional ◽  
Resonance Imaging ◽  
3D Mri ◽  
Great Precision ◽  
Conventional Mri ◽  
Labral Tears ◽  
Technical Details ◽  
Magnetic Resonance Imaging Mri ◽  
Technical Considerations

AbstractMagnetic resonance imaging (MRI) is a common choice among various imaging modalities for the evaluation of hip conditions. Conventional MRI with two-dimensional acquisitions requires a significant amount of time and is limited by partial-volume artifacts and suboptimal fluid-to-cartilage contrast. Recent hardware and software advances have resulted in development of novel isotropic three-dimensional (3D) single-acquisition protocols that cover the volume of the entire hip and can be reconstructed in arbitrary planes for submillimeter assessment of bony and labro-cartilaginous structures in their planes of orientation. This technique facilitates superior identification of small labral tears and other hip lesions with better correlations with arthroscopy. In this review, we discuss technical details related to 3D MRI of the hip, its advantages, and its role in commonly encountered painful conditions that can be evaluated with great precision using this technology. The entities described are femoroacetabular impingement with acetabular labral tears, acetabular dysplasia, avascular necrosis, regional tendinopathies and tendon tears, bursitis, and other conditions.

Advances in pediatric oncology MRI

2013 ◽  
Vol 54 (9) ◽  
pp. 1030-1036 ◽  
Author(s):  
Øystein E Olsen
Keyword(s):  
Malignant Disease ◽  
Tissue Characterization ◽  
Resonance Imaging ◽  
Clinical Implementation ◽  
Conventional Mri ◽  
Early Treatment Response ◽  
The Central Nervous System ◽  
Pediatric Mri ◽  
Magnetic Resonance Imaging Mri ◽  
New Applications

Refined stratification of disease is thought to result in better survival from childhood malignant disease while minimizing the adverse effects of anticancer therapies. There is a potential for magnetic resonance imaging (MRI) to contribute to such stratification by improved tissue characterization, anatomical depiction, staging, and assessment of early treatment response. Recent advances in pediatric MRI outside the central nervous system (CNS) are reviewed in this context. The focus is on new applications for conventional MRI and on clinical implementation of tissue-specific and quantitative techniques. This area is largely unexplored, and potential directions for research are indicated.

scholarly journals The contribution of susceptibility-weighted imaging (SWI) in the central nervous system superficial siderosis’ evaluation in 3 Tesla magnetic resonance imaging (MRI)

2021 ◽  
Vol 20 (3) ◽  
pp. 324-329
Author(s):  
Bünyamin Güney ◽  
◽  
İbrahim Önder Yeniçeri ◽  
Emrah Doğan ◽  
Neşat Çullu ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Vascular Malformation ◽  
3 Tesla ◽  
Superficial Siderosis ◽  
Susceptibility Weighted Imaging ◽  
Amyloid Angiopathy ◽  
Resonance Imaging ◽  
Significant Difference ◽  
Magnetic Resonance Imaging Mri

Objective. The aim of this study is to evaluate the magnetic resonance imaging (MRI) findings of central neural system (CNS) superficial siderosis cases and the diagnostic contribution of the susceptibility-weighted imaging (SWI) sequence to conventional imaging. Method. TSE T2-weighted and SWI-MRI of 26 patients diagnosed as CNS-superficial siderosis (CNS-SS) were retrospectively evaluated with 3-Tesla MRI. The localization and type of involvement of SS were reviewed. Results. The CNS-SS were divided into two categories as central amyloid angiopathy-SS (CAA-SS) and non central amyloid angiopathy-SS (non-CAA-SS). In non-CAA cases, the involvement was typical (classic) in 5 cases and atypical in 9 cases. In 12 of these cases (85.7%), SS findings were observed on both turbo spine echo (TSE) T2 images and SWI imaging, while in 2 cases (14.3%) SS was detected only on SWI images. In 7 of the CAA-SS cases, involvement was focal type SS (58.33%), while 5 cases had diffuse type SS (41.67%) involvement. In the vast majority of cases (n = 10) of this type of SS, involvement was detected only in SWI images, while siderosis was not detected in TSE T2 images. In addition, occult cerebral vascular malformation accompanying SS, which can be observed only in the SWI sequence, was found in a total of 4 cases. In the cross-matching statistical analysis performed between CAA-SS and non-CAA-SS groups and subgroups, SWI was found to be significantly superior to T2 in detecting SS in the CAA-SS group (p:0,007). Conclusions. SWI imaging was superior in detecting SS and detecting cerebral occult vascular malformation in CAA-SS cases. Although the detectability of SS by SWI was high in other groups, no statistically significant difference was found. Under these circumstances, we think that it will be beneficial to add SWI imaging to the routine imaging protocol in cases with suspected CNS-SS.

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