Structural, Functional and Spectroscopic MRI Studies of Methamphetamine Addiction

2011 ◽  
pp. 321-364 ◽  
Author(s):  
Ruth Salo ◽  
Catherine Fassbender
Keyword(s):  
Mri Studies

EVALUATION OF TREATMENT EFFICIENCY AND INFORMATIVITY OF MRI STUDIES IN PATIENTS WITH MIGRAINE

2020 ◽  
Vol 3 (1) ◽  
pp. 41-43
Author(s):  
Dilshod Kholmurodov ◽  
◽  
Aziza Djurabekova ◽  
Shoira Isanova ◽  
Saodat Igamova
Keyword(s):  
White Matter ◽  
Treatment Efficiency ◽  
Focal Lesions ◽  
Mri Studies

Migraine is currently considered a common pathology, which in many cases leads to a decrease in performance. Migraine diagnostics is the most important clinical, biomedical andsocial task. MRI studies are important in the diagnosis of migraine disease. Focal lesions are localized mainly in the white matter, which confirms the clinical nature of the disease. As a drug correction, the drug Sumamigren was proposed, the early intake of which allows avoiding migraine recurrence and transition to chronicity

scholarly journals Improved in vivo PET imaging of the adenosine A2A receptor in the brain using [18F]FLUDA, a deuterated radiotracer with high metabolic stability

2021 ◽  
Author(s):  
Thu Hang Lai ◽  
Magali Toussaint ◽  
Rodrigo Teodoro ◽  
Sladjana Dukić-Stefanović ◽  
Daniel Gündel ◽  
...  
Keyword(s):  
Specific Binding ◽  
Radiochemical Yield ◽  
Toxicity Study ◽  
In Vivo Evaluation ◽  
One Pot ◽  
Specific Binding Ratio ◽  
Mri Studies ◽  
The Brain

Abstract Purpose The adenosine A2A receptor has emerged as a therapeutic target for multiple diseases, and thus the non-invasive imaging of the expression or occupancy of the A2A receptor has potential to contribute to diagnosis and drug development. We aimed at the development of a metabolically stable A2A receptor radiotracer and report herein the preclinical evaluation of [18F]FLUDA, a deuterated isotopologue of [18F]FESCH. Methods [18F]FLUDA was synthesized by a two-step one-pot approach and evaluated in vitro by autoradiographic studies as well as in vivo by metabolism and dynamic PET/MRI studies in mice and piglets under baseline and blocking conditions. A single-dose toxicity study was performed in rats. Results [18F]FLUDA was obtained with a radiochemical yield of 19% and molar activities of 72–180 GBq/μmol. Autoradiography proved A2A receptor–specific accumulation of [18F]FLUDA in the striatum of a mouse and pig brain. In vivo evaluation in mice revealed improved stability of [18F]FLUDA compared to that of [18F]FESCH, resulting in the absence of brain-penetrant radiometabolites. Furthermore, the radiometabolites detected in piglets are expected to have a low tendency for brain penetration. PET/MRI studies confirmed high specific binding of [18F]FLUDA towards striatal A2A receptor with a maximum specific-to-non-specific binding ratio in mice of 8.3. The toxicity study revealed no adverse effects of FLUDA up to 30 μg/kg, ~ 4000-fold the dose applied in human PET studies using [18F]FLUDA. Conclusions The new radiotracer [18F]FLUDA is suitable to detect the availability of the A2A receptor in the brain with high target specificity. It is regarded ready for human application.

scholarly journals A systematic review of structural and functional MRI studies on pain catastrophizing

2019 ◽  
Vol Volume 12 ◽  
pp. 1155-1178 ◽  
Author(s):  
Attila Galambos ◽  
Edina Szabó ◽  
Zita Nagy ◽  
Andrea Edit Édes ◽  
Natália Kocsel ◽  
...  
Keyword(s):  
Systematic Review ◽  
Functional Mri ◽  
Pain Catastrophizing ◽  
Mri Studies

Arthroscopic Versus Open Anterior Shoulder Stabilization: A Prospective Randomized Clinical Trial With 15-Year Follow-up With an Assessment of the Glenoid Being “On-Track” and “Off-Track” as a Predictor of Failure

2021 ◽  
pp. 036354652110182
Author(s):  
Craig R. Bottoni ◽  
John D. Johnson ◽  
Liang Zhou ◽  
Sarah G. Raybin ◽  
James S. Shaha ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Shoulder Instability ◽  
Anterior Shoulder Instability ◽  
Shoulder Stabilization ◽  
Mri Studies ◽  
Open Stabilization ◽  
The Mean ◽  
Recurrent Anterior Shoulder Instability

Background: Recent studies have demonstrated equivalent short-term results when comparing arthroscopic versus open anterior shoulder stabilization. However, none have evaluated the long-term clinical outcomes of patients after arthroscopic or open anterior shoulder stabilization, with inclusion of an assessment of preoperative glenoid tracking. Purpose: To compare long-term clinical outcomes of patients with recurrent anterior shoulder instability randomized to open and arthroscopic stabilization groups. Additionally, preoperative magnetic resonance imaging (MRI) studies were used to assess whether the shoulders were “on-track” or “off-track” to ascertain a prediction of increased failure risk. Study Design: Randomized controlled trial; Level of evidence, 1. Methods: A consecutive series of 64 patients with recurrent anterior shoulder instability were randomized to receive either arthroscopic or open stabilization by a single surgeon. Follow-up assessments were performed at minimum 15-year follow-up using established postoperative evaluations. Clinical failure was defined as any recurrent dislocation postoperatively or subjective instability. Preoperative MRI scans were obtained to calculate the glenoid track and designate shoulders as on-track or off-track. These results were then correlated with the patients’ clinical results at their latest follow-up. Results: Of 64 patients, 60 (28 arthroscopic and 32 open) were contacted or examined for follow-up (range, 15-17 years). The mean age at the time of surgery was 25 years (range, 19-42 years), while the mean age at the time of this assessment was 40 years (range, 34-57 years). The rates of arthroscopic and open long-term failure were 14.3% (4/28) and 12.5% (4/32), respectively. There were no differences in subjective shoulder outcome scores between the treatment groups. Of the 56 shoulders, with available MRI studies, 8 (14.3%) were determined to be off-track. Of these 8 shoulders, there were 2 surgical failures (25.0%; 1 treated arthroscopically, 1 treated open). In the on-track group, 6 of 48 had failed surgery (12.5%; 3 open, 3 arthroscopic [ P = .280]). Conclusion: Long-term clinical outcomes were comparable at 15 years postoperatively between the arthroscopic and open stabilization groups. The presence of an off-track lesion may be associated with a higher rate of recurrent instability in both cohorts at long-term follow-up; however, this study was underpowered to verify this situation.

Deficit and non-deficit schizophrenia: Sleep, occulomotor amd MRI studies

1990 ◽  
Vol 3 (1) ◽  
pp. 60
Author(s):  
H. Gerbaldo ◽  
G. Thaker ◽  
H. Holcomb ◽  
C. Tamminga
Keyword(s):  
Deficit Schizophrenia ◽  
Mri Studies

A radiopathological classification of dural tail sign of meningiomas

2012 ◽  
Vol 117 (4) ◽  
pp. 645-653 ◽  
Author(s):  
Song-tao Qi ◽  
Yi Liu ◽  
Jun Pan ◽  
Silky Chotai ◽  
Lu-xiong Fang
Keyword(s):  
Tumor Cells ◽  
Histopathological Examination ◽  
Who Grade ◽  
Simpson Grade ◽  
Mri Studies ◽  
Dural Tail Sign ◽  
Significant Difference ◽  
Different Types ◽  
Dural Tail

Object The completeness of meningioma resection depends on the resection of dura mater invaded by the tumor. The pathological changes of the dura around the tumor can be interpreted by evaluating the dural tail sign (DTS) on MRI studies. The goal of this study was to clarify the pathological characteristics of the DTSs, propose a classification based on the histopathological and radiological correlation, and identify the invasive range of tumor cells in different types of DTS. Methods The authors retrospectively reviewed 179 patients with convexity meningiomas who underwent Simpson Grade I resection. All patients underwent an enhanced MRI examination preoperatively. The convexity meningiomas were dichotomized into various subtypes in accordance with the 2007 WHO classification of tumors of the CNS, and the DTS was identified based on the Goldsher criteria. The range of resection of the involved dura was 3 cm from the base of the tumor, which corresponded with the length of DTS on MRI studies. Histopathological examination of dura at 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 cm from the base of the tumor was conducted, and the findings were correlated with the preoperative MRI appearance of the DTS. Results A total of 154 (86%) of 179 convexity meningiomas were classified into WHO Grade I subtype, including transitional (44 [28.6%] of 154), meningothelial (36 [23.4%] of 154), fibrous (23 [14.9%] of 154), psammomatous (22 [14.3%] of 154), secretory (10 [6.5%] of 154), and angiomatous (19 [12.3%] of 154). The other 25 (14%) were non–Grade I (WHO) tumors, including atypical (12 [48%] of 25), anaplastic (5 [20%] of 25), and papillary (8 [32%] of 25). The DTS was classified into 5 types: smooth (16 [8.9%] of 179), nodular (36 [20.1%] of 179), mixed (57 [31.8%] of 179), symmetrical multipolar (15 [8.4%] of 179), and asymmetrical multipolar (55 [30.7%] of 179). There was a significant difference in distribution of DTS type between Grade I and non–Grade I tumors (p = 0.004), whereas the difference was not significant among Grade I tumors (0.841) or among non–Grade I tumors (p = 0.818). All smooth-type DTSs were encountered in Grade I tumors, and the mixed DTS (52 [33.8%] of 154) was the most common type in these tumors. Nodular-type DTS was more commonly seen in non–Grade I tumors (12 [48%] of 25). Tumor invasion was found in 88.3% (158 of 179) of convexity meningiomas, of which the range of invasion in 82.3% (130 of 158) was within 2 cm and that in 94.9% (150 of 158) was within 2.5 cm. The incidence of invasion and the range invaded by tumor cells varied in different types of DTS, and differences were statistically significant (p < 0.001). Conclusions Nodular-type DTS on MRI studies might be associated with non–Grade I tumors. The range of dural resection for convexity meningiomas should be 2.5 cm from the tumor base, and if this extent of resection is not feasible, the type of DTS should be considered. However, for skull base meningiomas, in which mostly Simpson Grade II resection is achieved, the use of this classification should be further validated. The classification of DTS enables the surgeon to predict preoperatively and then to achieve the optimal range of dural resection that might significantly reduce the recurrence rate of meningiomas.

scholarly journals Title: IDENTIFYING THE AXILLARY NERVE DURING SHOULDER SURGERY: AN ANATOMIC STUDY USING ADVANCED IMAGING

2021 ◽  
Vol 9 (7_suppl3) ◽  
pp. 2325967121S0003
Author(s):  
Michael E. Hachadorian ◽  
Brendon C. Mitchell ◽  
Matthew Y. Siow ◽  
Wilbur Wang ◽  
Tracey Bastrom ◽  
...  
Keyword(s):  
High Resolution ◽  
Rotator Cuff ◽  
Axillary Nerve ◽  
Small Sample ◽  
Shoulder Surgery ◽  
Rotator Cuff Tears ◽  
Large Sample Size ◽  
Musculoskeletal Radiology ◽  
Reconstructive Procedures ◽  
Mri Studies

Background: The axillary nerve (AXN) is one of the more commonly injured nerves during shoulder surgery. Prior anatomic studies of the AXN in adults were performed using cadaveric specimens with small sample sizes. Our research observes a larger cohort of magnetic resonance imaging (MRI) studies in order to gain a more representative sample of the course of the axillary nerve and aid surgeons intraoperatively. Methods: High-resolution 3T MRI studies performed at our institution from January 2010 to June 2019 were reviewed. Four blinded reviewers with musculoskeletal radiology or orthopaedic surgery training measured the distance of the AXN to the surgical neck of the humerus (SNH), the lateral tip of the acromion (LTA), and the inferior glenoid rim (IGR). Intra-class Correlation Coefficient (ICC) was calculated to assess reliability between reviewers. The nerve location was assessed relative to rotator cuff tear status. Results: A total of 257 shoulder MRIs were included. ICC was excellent at 0.80 for SNH, 0.90 for LTA and 0.94 for IGR. All intra-observer reliabilities were above 0.80. Mean distance from AXN to SNH was 1.7 cm (0.7-3.1 cm, IQR 1.38-2.00) and AXN to IGR was 1.6 cm (0.6-2.6 cm, IQR 1.33-1.88). The mean AXN to LTA distance was 7.1 cm, with a range of 5.2 to 9.0 cm across patient heights; there was a large effect size related to LTA to AXN distance and patient height with a correlation of r=0.603, (p<0.001). Rotator cuff pathology appears to affect nerve location by increasing the distance between AXN and SNH (p = 0.027). Discussion/Conclusion: The AXN is vulnerable to injury during both open and arthroscopic shoulder procedures. This injury can be either a result of direct trauma to the nerve or secondary to traction placed on the nerve with reconstructive procedures that distalize the humerus. Our study demonstrates that the axillary nerve can be found as little as 5.6 mm from IGR and 6.9 mm from the SNH. Additionally, we illustrate the relationship between patient height and LTA to AXN distance and complete rotator cuff tears and SNH to AXN distance. Our study is the first to demonstrate the nerve’s proximity to important surgical landmarks of the shoulder using a large sample size of high-resolution images in living human shoulders. Tables/Figures: [Figure: see text][Table: see text]

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