scholarly journals Evaluation of Brain Iron Content Based on Magnetic Resonance Imaging (MRI): Comparison among Phase Value, R2* and Magnitude Signal Intensity

PLoS ONE ◽  
2012 ◽  
Vol 7 (2) ◽  
pp. e31748 ◽  
Author(s):  
Shen-Qiang Yan ◽  
Jian-Zhong Sun ◽  
Yu-Qing Yan ◽  
He Wang ◽  
Min Lou
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Iron Content ◽  
Signal Intensity ◽  
Resonance Imaging ◽  
Brain Iron ◽  
Magnetic Resonance Imaging Mri

Could we assess the functional status, of hormone secreting, or non-secreting of the adrenal masses regarding their Magnetic Resonance Imaging (MRI) characteristics?

2021 ◽  
Vol 22 ◽  
Author(s):  
Gamze Akkus ◽  
Ferhat Piskin ◽  
Barış Karagun ◽  
Murat Sert ◽  
Mehtap Evran ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Functional Status ◽  
Signal Intensity ◽  
Adrenal Mass ◽  
Resonance Imaging ◽  
Intensity Index ◽  
Adrenal Masses ◽  
Magnetic Resonance Imaging Mri

Background: Diagnostic imaging techniques including magnetic resonance imaging (MRI) should also perform on all patients with incidentalomas. However, there is a limited study whether the quantitative measurements (signal intensity index, adrenal to spleen ratio) in MRI could predict the functional status of adrenal adenomas. Material-Method: Between 2015-2020; 404 patients (265 females, 139 males) with adrenal mass who were referred to the university hospital for further investigation were included. After detailed diagnostic hormonal evaluation, all patients underwent MRI 1.5 T device (Signa, GE Medical Systems; Milwaukee, USA). The signal intensities of the adrenal lesions on T2W images were qualitatively evaluated and noted as homogenous or heterogeneous in comparison with the liver signal intensity (SI). A chemical-shift SI index and chemical shift adrenal-to-spleen SI ratio were also calculated. Results: While 331(81.9%) of the patients had nonfunctional adrenal mass, the rest of them (n=73, 18.1%) were patients with functional (autonomous cortisol secretion-ACS, cushing syndrome-CS, pheochromocytoma, primary hyperaldosteronism-PA) adrenal masses. In phase vs phase values of patients with NFAI, Pheo(n=17), ACS (n=30), CS (n=11), and PA (n=15) were 474.04±126.7 vs 226.6±132.4, 495.3±182.8 vs 282.17±189.1, 445.2±134.8 vs 203.3±76.2, 506.8±126.5 vs 212.2±73.6 and 496.2±147.5 vs 246.6±102.1, respectively. Mean signal intensity index (SII) and adrenal to spleen ratio (ASR) of all groups (NFAI, Pheo, ACS, CS, PA) were 52.0±24.8 and 0.51, 44.9±22.5 and 0.55, 49.5±24.5 and 0.53, 56.2±16.4 and 0.43, 47.6±25.1 and 0.54, respectively. Based the current accepted measurements in the case of ASR and SII, all lesions were similar and shown as fat rich adenomas (p*= 0.552, p** = 0.45). Conclusion: The quantitative assessment (SII, ASR) of intracellular lipids in an incidentally discovered adrenal tumour could only help distinguish adrenal masses in case of adenomas or non-adenomas As initial diagnostic evaluation, clinical and laboratory assessment ,to distinguish hormone secretion, should be taken in all patients with adrenal incidentalomas.

scholarly journals Diagnostic value of magnetic resonance imaging in the analysis of ameloblastoma: report of two cases

2019 ◽  
Vol 22 (3) ◽  
pp. 425-431
Author(s):  
Neiandro Santos Galvão ◽  
Antonione Santos Bezerra Pinto ◽  
Alan Leandro Carvalho Farias ◽  
André Luiz Ferreira Costa ◽  
Sérgio Lúcio Pereira de Castro Lopes ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Diagnostic Value ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity ◽  
Additional Information ◽  
Imaging Characteristics ◽  
Magnetic Resonance Imaging Mri

Ameloblastoma is an odontogenic tumor that shares clinical and imaging characteristics with other lesions of the jaws, such as odontogenic keratocyst, which makes the diagnosis difficult. However, in addition to radiographic and tomographic examinations, Magnetic Resonance Imaging (MRI) has been increasingly used, contributing with relevant additional information about the differentiation between solid and liquid components of the lesion. This case report was conducted to present two variations of ameloblastoma and discuss the radiographic, tomographic and MRI contribution in the differential diagnosis between ameloblastoma and odontogenic keratocyst.The signal intensity in T1-weighted MRI revealed internal fluid content in both cases, which was important in the differential diagnosis with other intraosseous lesions such as odontogenic keratocysts. This is probably due to the presence of keratin that increases the viscosity of the content and also for an intermediate signal intensity signal in T2-weighted MRI. Therefore, MRI revealed important internal characteristics of the reported lesions, which was very useful in the establishment of the differential diagnosis with other lesions.

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.

scholarly journals Basic knowledge for hepatic MRI interpretation

2019 ◽  
Vol 2 (1) ◽  
pp. 9-12
Author(s):  
Wanwarang Teerasamit
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Tissue Characterization ◽  
Basic Knowledge ◽  
Liver Lesions ◽  
Resonance Imaging ◽  
Mr Contrast Agents ◽  
Magnetic Resonance Imaging Mri ◽  
Weighted Sequences

Nowadays, Magnetic resonance imaging (MRI) has an important role for diagnosis of liver lesions due to excellent tissue characterization, radiation-free technique and continuous development of MRI technology, causing an increased use of MRI. This article focuses on basic knowledge of MRI liver interpretation for non-radiologist. The basic techniques including T1-weighted and T2-weighted sequences as well as additional techniques such as 2D dual GRE in-phase and opposed-phase, fat suppression or heavily T2-weighted sequences were introduced. Types of MR contrast agents for liver including extracellular and hepatocyte-specific agents were also described.   Figure 1  เป็นภาพ MRI ของตับเทคนิค T1W โดยอวัยวะส่วนใหญ่ที่ปรากฏในภาพจะให้ลักษณะ signal intensity ไปในทางhypointense ซึ่งจะเห็นว่าม้าม (spleen=S) ดำกว่าตับ (liver=L) และตับจะดำกว่าตับอ่อน (pancreas=P) โดยลูกศรสีดำชี้ให้เห็น signal intensity ของน้ำไขสันหลังที่เป็นลักษณะ hypointense

Magnetic resonance imaging of degenerative changes of the posterior cruciate ligament

2016 ◽  
Vol 58 (3) ◽  
pp. 338-343 ◽  
Author(s):  
Ferdinando Draghi ◽  
Chandra Bortolotto ◽  
Davide Renato Coscia ◽  
Mario Canepari ◽  
Salvatore Gitto
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Posterior Cruciate Ligament ◽  
Signal Intensity ◽  
Cruciate Ligament ◽  
Degenerative Changes ◽  
Resonance Imaging ◽  
Mucoid Degeneration ◽  
Mri Findings ◽  
Magnetic Resonance Imaging Mri

Background Mucoid degeneration and ganglia reflect a continuum of degenerative changes within the posterior cruciate ligament (PCL). Purpose To assess the prevalence of and radiologists’ familiarity with PCL mucoid degeneration and ganglia. Material and Methods Knee magnetic resonance imaging (MRI) from July 2013 to June 2015, excluding patients who had a preceding trauma or MRI findings indicative of a prior injury, were retrospectively reviewed, with the specific request to assess degenerative changes of the PCL, by the same musculoskeletal radiologists who previously reported these examinations, and one fellow. Results A total of 692 patients entered this study. The radiologists and the fellow together identified mucoid degeneration in 34 patients (4.9%), ganglia in 14 patients (2.0%), and both in four patients (0.6%). Several patterns of PCL mucoid degeneration were identified: diffuse thickening in seven patients, partial thickening in 16 (four associated with a ganglion), longitudinal intraligamentous PCL signal-intensity abnormalities resembling a “tram track” in 15. In all cases there was increased signal intensity on fluid-sensitive sequences. In the previous reports, only three cases of PCL mucoid degeneration out of 38 (7.9%) were described, with intraligamentous PCL signal-intensity abnormalities. In the reports of the patients with degeneration and ganglia, only ganglia were described. In the previous reports, ganglia were correctly diagnosed. Conclusion Mucoid degeneration of the PCL is much more common than previously assumed and is underestimated by radiologists.

Does collagenase injection disrupt or digest the Dupuytren’s cord: a magnetic resonance imaging study

2016 ◽  
Vol 41 (6) ◽  
pp. 614-620 ◽  
Author(s):  
K. M. Crivello ◽  
H. G. Potter ◽  
E. S. Moon ◽  
S. K. Rancy ◽  
Scott W. Wolfe
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Imaging Study ◽  
Resonance Imaging ◽  
Level Of Evidence ◽  
Collagenase Injection ◽  
Intensity Changes ◽  
Full Correction ◽  
Magnetic Resonance Imaging Mri

Collagenase clostridium histolyticum has been extensively studied as a treatment modality for Dupuytren’s contracture. Its mechanism of action has been documented. It is unknown whether injected collagenase weakens the Dupuytren’s cord sufficiently to cause failure during manipulation or if there is digestion and reduction in cord volume. We examined five patients with isolated contractures of the ring or middle metacarpalphalangeal (MP) joint using magnetic resonance imaging (MRI) prior to injection with collagenase and again 1 month following injection. All patients had full correction after manipulation which was maintained at follow-up. The Dupuytren’s cord was evaluated with respect to volume, signal intensity, inflammatory changes and continuity. Additionally, signal intensity changes of the flexor tendons and neurovascular structures were recorded. MRI demonstrated cord discontinuity, significant reduction of cord volume and a significant increase in cord signal intensity after treatment with collagenase. There was a slight increase in flexor tendon signal intensity that was not significant. These findings suggest that there may be local chemical dissolution of the cord. Future studies may establish whether or not this will have prognostic implications in terms of correction and recurrence following collagenase injection. Level of evidence: IV

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