scholarly journals Susceptibility Weighted Imaging as a Useful Imaging Adjunct in Hemichorea Hyperglycaemia

2013 ◽  
Vol 2013 ◽  
pp. 1-3 ◽  
Author(s):  
Ferry Dharsono ◽  
Andrew Thompson ◽  
Jolandi van Heerden ◽  
Andrew Cheung
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Corpus Striatum ◽  
Clinical Entity ◽  
Susceptibility Weighted Imaging ◽  
Resonance Imaging ◽  
Weighted Image ◽  
Susceptibility Weighted Image ◽  
Mri Sequences ◽  
Magnetic Resonance Imaging Mri

Hyperglycaemia with hemichorea (HGHC) is an unusual clinical entity that can be associated with corpus striatum hyperintensity on T1-weighted (T1W) magnetic resonance imaging (MRI) sequences. We report the utility of the susceptibility weighted image (SWI) sequence and the filtered phase SWI sequence in the imaging assessment of HGHC.

scholarly journals Effectiveness of low-field magnetic resonance imaging in diagnosing brachial plexus tumours in dogs – short communication

2015 ◽  
Vol 59 (2) ◽  
pp. 317-319
Author(s):  
Zbigniew Adamiak ◽  
Yauheni Zhalniarovich ◽  
Paulina Przyborowska ◽  
Joanna Głodek ◽  
Adam Przeworski
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Brachial Plexus ◽  
Resonance Imaging ◽  
Gadolinium Contrast ◽  
Gadolinium Contrast Agent ◽  
Low Field ◽  
Mri Sequences ◽  
Magnetic Resonance Imaging Mri ◽  
Brachial Plexus Tumours

AbstractThe aim of the study was to identify magnetic resonance imaging (MRI) sequences that contribute to a quick and reliable diagnosis of brachial plexus tumours in dogs. The tumours were successfully diagnosed in 6 dogs by the MRI with the use of SE, FSE, STIR, Turbo 3 D, 3D HYCE, and GE sequences and the gadolinium contrast agent

scholarly journals Grading of Gliomas by Using Radiomic Features on Multiple Magnetic Resonance Imaging (MRI) Sequences

2017 ◽  
Vol 23 ◽  
pp. 2168-2178 ◽  
Author(s):  
Jiang-bo Qin ◽  
Zhenyu Liu ◽  
Hui Zhang ◽  
Chen Shen ◽  
Xiao-chun Wang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Mri Sequences ◽  
Magnetic Resonance Imaging Mri

scholarly journals The ivy sign

2014 ◽  
Vol 18 (1) ◽  
Author(s):  
Nasreen Mahomed ◽  
Evance Chisama ◽  
Sanjay Prabhu
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Moyamoya Disease ◽  
Signal Intensity ◽  
Perivascular Spaces ◽  
Resonance Imaging ◽  
Leptomeningeal Enhancement ◽  
Weighted Magnetic Resonance Imaging ◽  
Mri Sequences ◽  
Magnetic Resonance Imaging Mri

The ivy sign refers to diffuse bilateral leptomeningeal enhancement on post- contrastT1-weighted magnetic resonance imaging (MRI) and increased signal intensity in bilateralsubarachnoid spaces and perivascular spaces on T2-weighted fluid attenuation inversionrecovery (FLAIR) MRI sequences in patients with moyamoya disease.

Magnetic Resonance Imaging, Chest Radiography, Computed Tomography and Ultrasonography in Malignant Lymphoma

1987 ◽  
Vol 28 (3) ◽  
pp. 253-262 ◽  
Author(s):  
R. Nyman ◽  
S. Rehn ◽  
B. Glimelius ◽  
H. Hagberg ◽  
A. Hemmingsson ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Lymph Nodes ◽  
Malignant Lymphoma ◽  
Chest Radiography ◽  
Resonance Imaging ◽  
Weighted Image ◽  
Non Hodgkin Lymphoma ◽  
Magnetic Resonance Imaging Mri

Magnetic resonance imaging (MRI) was compared with chest radiography, computed tomography (CT) and ultrasonography (US) for demonstration of spleen and liver engagement and enlarged lymph nodes in patients with malignant lymphoma. The investigation comprised 24 patients with Hodgkin's disease (HD) and 39 with non-Hodgkin lymphoma (NHL). MRI demonstrated enlarged lymph nodes, distinctly separated from vessels, fat, muscle, liver and occasionally also pancreas without any contrast medium. The distinction between lymph nodes and spleen was, however, poor in the images. In the mediastinum, MRI was superior to chest radiography and had an accuracy similar to that of CT. In the abdomen and the pelvis MRI had slight advantages over CT in detection of enlarged lymph nodes. Compared with US the MRI results were similar in the abdomen and somewhat better in the pelvis. MRI and US were better than CT in revealing HD infiltrates in the spleen. Infiltration of NHL in the spleen was slightly better disclosed at US than at CT and MRI; most of the NHL infiltration, confirmed at histopathology, could, however, not be revealed with any of the modalities, except when the size of the spleen was considered. Regions in the spleen, displayed with low image intensity in the T2 weighted image, were most likely due to increased amount of fibrotic tissue in the lymphomatous lesions. Good demonstration of lymph nodes and lymphomatous lesions in the spleen with MRI required two sequences; one with short TR and TE (T1 weighted image) and one with long TR and TE (T2 weighted image).

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.

scholarly journals Magnetic Resonance Imaging Evaluation of Cerebral Microbleeds: A Comparative Analysis of Susceptibility Weighted Imaging and T2 Gradient Recalled Echo Sequences

2020 ◽  
Author(s):  
Abhinav Juneja ◽  
Rajiv Azad ◽  
Ankur Malhotra
Keyword(s):  
Magnetic Resonance Imaging ◽  
Risk Factors ◽  
Magnetic Resonance ◽  
Correlation Coefficient ◽  
Small Vessel Disease ◽  
Cerebral Microbleeds ◽  
P Value ◽  
Susceptibility Weighted Imaging ◽  
Resonance Imaging ◽  
Mri Sequences

Introduction: Cerebral Microbleeds (CMBs) are increasingly recognised as an important predictor of small vessel disease and cannot be detected on routine Computed Tomography (CT) or Magnetic Resonance Imaging (MRI) sequences. Aim: CMBs on MRI and to compare the sensitivity of Susceptibility Weighted Imaging (SWI) and T2* Gradient Recalled Echo (GRE) sequences in detection of these microbleeds. Also, to evaluate association between topography (size, number and location) of CMBs and various risk factors. Materials and Methods: This Prospective Observational analytical study comprised of 67 patients with CMBs who were evaluated with Siemens 1.5 Tesla MRI machine. T2*-weighted GRE sequence and SWI were taken in all the patients in addition to routine MRI sequences. Two observers blinded to clinical information, independently interpreted the T2*GRE and SWI sequences. Both observers recorded the topographical details of CMBs which included presence, number, size and location and their association with various risk factors (hypertension, diabetes, smoking and hyperlipidemia). Inter-rater agreement for the number of CMBs on SWI and T2*GRE was calculated using Cohen’s Kappa (κ) as measure of agreement. Intra-Class Correlation Coefficient (ICC) for reliability index in test-retest, intra-rater and inter-rater reliability was also analysed. The intra-rater reliabilities of each rater were compared. The correlations between CMBs and risk factors was performed with Pearson’s correlation Coefficient (r). The p-value <0.05 was considered statistically significant. Results: The SWI with its Reverse Phase (RP) detected more number of CMBs as compared to T2*GRE. Majority of the subjects (71.6%) had more than five CMBs. CMBs ≥5 mm had a strong correlation with both hypertension and diabetes as compared to CMBs <5 mm. There was a higher frequency of patients with lobar CMBs (89.6%) followed by the deep location (70.1%). An almost perfect agreement was found between both observers for number of CMBs on RP SWI with ‘κ’ value of 0.97a (0.96-0.98) in contrast to a weak agreement on RP T2*GRE with κ=0.52a (0.40-0.64). For SWI, an almost perfect reliability was found (ICC=0.998) as compared to a moderate reliability on T2*GRE (ICC=0.6826). An excellent reliability was seen for size of CMBs <5 mm on RP SWI (ICC 0.998). Conclusion: SWI offered greater reliability and sensitivity for CMB detection as compared to the T2*GRE sequence and is presently the gold standard sequence of MRI for quantifying CMBs. The burden of CMBs may further indicate inappropriately treated hypertension and diabetes.

scholarly journals Comparison of Post-mortem 7.0-Tesla Magnetic Resonance Imaging of the Brains of Alzheimer Patients with and without Cerebral Amyloid Angiopathy

2020 ◽  
Vol 4 (4) ◽  
Author(s):  
Jacques De Reuck ◽  
◽  
Florent Auger ◽  
Nicolas Durieux ◽  
Claude-Alain Maurage ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Cerebral Amyloid Angiopathy ◽  
Amyloid Angiopathy ◽  
Post Mortem ◽  
Resonance Imaging ◽  
Cerebrovascular Lesions ◽  
Mri Sequences ◽  
Cerebral Amyloid ◽  
Magnetic Resonance Imaging Mri

Purpose: The influence of cerebral amyloid angiopathy (CAA) in Alzheimer’s disease (AD) remains unexplored. The present post-mortem study investigated possible differences in the degree of hippocampal atrophy (HA) between AD patients with and without CAA using 7.0-tesla magnetic resonance imaging (MRI). Also, the incidence of the hippocampal cortical micro-infarcts (HCoMIs) and hippocampal cortical micro-bleeds (HCoMBs) is compared to those in the neocortex. Methods: The examined post-mortem brains included 30 AD-CAA cases and 20 AD without CAA cases. The samples of the hippocampus were evaluated on the most representative coronal section with T2 and T2* MRI sequences. The average degree of HA was determined in both groups. The incidences of HCoMIs and HCoMBs, along with the frequency of CoMIs and CoMBs in the neocortex were compared in both groups: AD-with CAA and AD without CAA cases. Results: No significant differences were observed in the degree of HA and the incidence of hippocampal micro-infarcts (HMIs) and hippocampal micro-bleeds (HMBs) between the AD-CAA and the AD brains in contrast to the higher incidence of these cerebrovascular lesions in the neocortex of AD-CAA brains. The incidence of CoMIs and CoMBs in the neocortex showed similarity to that in the hippocampus of AD patients without CAA. Conclusions: CAA does not influence the degree of HA and the incidence of micro-infarcts (MIs) and micro-bleeds (MBs) in the hippocampus, in contrast to the high contribution of the latter with CAA in the neocortex. The hippocampus seems to be more spared from cerebrovascular involvement than the other parts of the brain.

Zakrzepica żył i zatok mózgowia – opis przypadku

2017 ◽  
pp. 8
Author(s):  
Mariusz Wachowski
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Sinus Thrombosis ◽  
Venous Sinus ◽  
Susceptibility Weighted Imaging ◽  
Resonance Imaging ◽  
Venous Sinus Thrombosis ◽  
Dural Venous Sinus ◽  
Magnetic Resonance Imaging Mri ◽  
Dural Venous Sinus Thrombosis

Tło. Zakrzepica zatok żylnych (dural venous sinus thrombosis – DVST) stanowi istotny i trudny problem diagnostyczny ze względu na mało specyfi czny obraz kliniczny oraz zróżnicowaną dynamikę objawów. Celem niniejszego opisu przypadku jest uzasadnieniemożliwości wykorzystania sekwencji zależnej od podatności magnetycznej (susceptibility-weighted imaging – SWI) w skutecznym rozpoznawaniu DVST oraz w różnicowaniu jej potencjalnych powikłań. Opis przypadku. 38-letnia pacjentka została przyjęta do kliniki neurologii z powodu silnego bólu głowy z następczą utratą przytomności. Przy przyjęciu wykonano przeglądową tomografi ę komputerową (TK) głowy. Uzyskane obrazy oceniono jako prawidłowe. W 6. dobie hospitalizacji ze względu na nagłe pogorszenie stanu klinicznego oraz podwyższone wartości D-dimerów przeprowadzono jednofazowe badanie metodą rezonansu magnetycznego (magnetic resonance imaging – MRI). Stwierdzono poszerzenie zatoki strzałkowej górnej oraz obecność skrzepliny na odcinku około 55 mm. Ponadto w sekwencji FLAIR oraz T2-zależnej stwierdzonoobszary patologiczne w zakręcie zaśrodkowym. W związku z podejrzeniem wystąpienia zawału żylnego przeprowadzono sekwencję SWI, co pozwoliło na jego wykluczenie. Ustalono rozpoznanie przekrwienia żylnego. Wnioski. Analiza obrazu w sekwencji SWI pozwoliła na jednoznaczne wykluczenie udaru krwotocznego i umożliwiła kontynuowanie terapii przeciwzakrzepowej.

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

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.

scholarly journals Magnetic resonance imaging brain sequences in pediatrics

2021 ◽  
Vol 36 ◽  
pp. 27-34
Author(s):  
Ravindra Bhimrao Kamble
Keyword(s):  
Magnetic Resonance Imaging ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Pediatric Patients ◽  
Disease Process ◽  
Review Article ◽  
Resonance Imaging ◽  
Mri Sequences ◽  
Rapid Mri ◽  
Magnetic Resonance Imaging Mri

There are various pediatric magnetic resonance imaging (MRI) protocols followed in institutes and by individual radiologists, determined by the disease process and the indication for imaging, to narrow down the differential diagnosis. Most times, it is beneficial to modify protocols when the scans are being done, based on the findings seen on initially acquired sequences. This is particularly useful in pediatric patients considering most of them are scanned either under sedation or general anesthesia, and repeat scans will be cumbersome. In this particular review article, we are going to discuss appropriate MRI sequences in scanning pediatric brains and the need for rapid MRI sequences. This is of immense importance as MRI in pediatric patients poses challenges both to radiologists and technologists. Consequently, appropriate MRI protocols should be set to avoid repeat studies.

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