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Search Results: 1 - 10 of 7674 matches for " Seyed Hassan Mostafavi "
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MR Imaging of Ankle Impingement Syndromes
Seyed Hassan Mostafavi
Iranian Journal of Radiology , 2010,
Abstract: Ankle impingement syndromes are characterized by painful friction of joint tissues. This is both the cause and the effect of altered joint biomechanics. The leading causes of impingement lesions are posttraumatic ankle injuries, usually ankle sprains, resulting in chronic ankle pain. "nBased on anatomic and clinical viewpoints, there are five types of ankle impingement syndromes:"n1. Anterolateral"n2. Anterior"n3. Anteromedial"n4. Posteromedial"n5. Posterior"nCareful analyses of patient history and signs and symptoms at physical examination can suggest a specific diagnosis in most patients. MR imaging and MR arthrography are the most useful imaging methods for detecting the osseous and soft-tissue abnormalities present in these syndromes and for ruling out other potential causes of chronic ankle pain. "nThis presentation summarizes the MR imaging, and MR arthrography findings of ankle impingement syndromes.
Imaging of Orbital Infections
Seyed Hassan Mostafavi
Iranian Journal of Radiology , 2010,
Abstract: Preseptal and orbital cellulitis occur more commonly in children than adults. The history and physical examination are crucial in distinguishing between preseptal and orbital cellulitis. The orbital septum delineates the anterior eyelid soft tissues from the orbital soft tissue. Infections anterior to the orbital septum are classified as preseptal cellulitis and those posterior to the orbital septum are termed orbital cellulitis. "nRecognition of orbital involvement is important not only because of the threatened vision loss associated with orbital cellulitis but also because of the potential for central nervous system complications including cavernous sinus thrombosis, meningitis, and death. "nOrbital imaging should be obtained in all patients suspected of having orbital cellulitis. CT is preferred to MR imaging, as the orbital tissues have high con-trast and the bone can be well visualized. Orbital CT scanning allows localization of the disease process to the preseptal area, the extraconal or intraconal fat, or the subperiosteal space. Axial CT views allow evaluation of the medial orbit and ethmoid sinuses, whereas coronal scans image the orbital roof and floor and the frontal and maxillary sinuses. If direct coronal imaging is not possible, reconstruction of thin axial cuts may help the assessment of the orbital roof and floor. Potential sources of orbital cellulitis such as sinusitis, dental infection, and facial cellulitis are often detectable on CT imaging. "nIn this presentation, the imaging considerations of the orbital infections; including imaging differentiation criteria of all types of orbital infections are reviewed.
MRI of the Brachial Plexus
Seyed Hassan Mostafavi
Iranian Journal of Radiology , 2010,
Abstract: Evaluation of the brachial plexus is a clinical chal-lenge. Physical examination has traditionally been a mainstay in evaluating and localizing pathology involving the brachial plexus. Physical examination is especially difficult in patients with scarring and fibrosis secondary to surgery or irradiation. Electrophysiologic studies may be used to detect abnormalities in nerve conduction, but are poor for localizing a lesion. "nMRI has become increasingly important in the evaluation of brachial plexus pathology, as the technology and resolution has improved. Correlation of imaging results with electrophysiologic findings increases the overall specificity and sensitivity. CT has increased sensitivity for depicting extrinsic masses that com-press the nerves; however, it offers poor soft tissue contrast to directly evaluate the nerves."nWith the advent of MRI, nerves that compose the brachial plexus can now be directly evaluated. Intrinsic and extrinsic pathology may be evaluated. Exact anatomic components of the brachial plexus, such as the roots, trunks, divisions, and cords may be identified. MRI has the additional benefit of multiplanar imaging and increased soft tissue contrast. The tissue resolution of MRI is constantly improving with new pulse sequences and coil designs."nWith radiography and CT, changes in the shape or position of the brachial plexus were used to assess the pathology. With MRI, the nerve can be directly visualized and evaluated for pathology. MRI sequences such as fat-saturated T2-weighted spin-echo, short-tau inversion recovery (STIR), and gadolinium-enhanced T1-weighted spin-echo sequences help in depicting subtle changes in the signal intensity of the nerves or enhancement and aid in refining the differential diagnosis. In addition, maximum intensity projections can make localization and visualization of the pathology most understandable for referring clinicians and surgeons.
Triangular Fibrocartilage Complex MR Imaging
Seyed Hassan Mostafavi
Iranian Journal of Radiology , 2010,
Abstract: Interpretation of MR imaging of the wrist may be difficult because of the small size of this joint, its complex anatomy, and its sometimes poorly unders-tood pathologic lesions. A recent study revealed that MR imaging of the wrist influences clinicians' diagnoses and management plans in most patients. "nWhich structures make up the triangular fibrocarti-lage complex (TFCC) are not universally agreed upon. In most descriptions, however, the TFCC is composed of the triangular fibrocartilage (TFC), the meniscus homolog, the ulnar collateral ligament, the dorsal and volar radioulnar ligaments and the sheath of the extensor carpi ulnaris tendon. The ulnolunate and ulnotriquetral ligaments may also be considered as part of the TFCC. These structures are a complex unit that function as a stabilizing element in the pivot movement of the radius and ulna and limit the lateral deviation of the carpus. The distal radioulnar joint is primarily stabilized by the TFCC. The TFC functions as a cushion between the ulnar head and carpal bones. Many of the structures that make up the complex are connected by fibrous bands. "nThis presentation summarizes the current diagnostic criteria that can be useful in interpreting abnormalities of the triangular fibrocartilage complex (TFCC) of the wrist in this difficult topic in joint MR imaging
Imaging of Soft Tissue Lesions of the Foot and Ankle
Seyed Hassan Mostafavi
Iranian Journal of Radiology , 2010,
Abstract: Differential diagnosis of soft tissue lesions of the foot may be narrowed with imaging. The cystic nature of ganglia, synovial cysts, and bursitis can be confirmed with MR imaging or sonography. Location and signal characteristics of noncystic lesions may suggest Morton's neuroma, giant cell tumor of the tendon sheath and plantar fibromatosis. Synovial-based lesions of the foot and ankle can be differentiated based on presence or absence of mineralization, lesion density, signal intensity, and the enhancement pattern. Knowledge of the incidence of specific neoplasms of the foot and ankle based on patient age aids in providing a limited differential diagnosis
Rheumatological Findings in Candidates for Valvular Heart Surgery
Mohammad Bagher Owlia,Seyed Jalil Mirhosseini,Nafiseh Naderi,Seyed Mohammad Yousof Mostafavi Pour Manshadi,Sadegh Ali Hassan Sayegh
ISRN Rheumatology , 2012, DOI: 10.5402/2012/927923
Abstract: Background and Objectives. Valvular heart diseases are among the frequent causes of cardiac surgery. Some patients have a well-known rheumatic condition. Heart valves are fragile connective tissues which are vulnerable to any systemic autoimmune diseases. This study was designed to evaluate the frequency of rheumatological background in patients candidate for valvular heart surgery in Afshar Cardiovascular Center, Yazd, Iran. Methods. One hundred and twenty (120) patients candidate for valvular heart surgery were selected for this study. Careful history and physical examination were undertaken from rheumatological stand points. The most sensitive screening serologic tests were also assayed. Results. The result of this study showed that 53.3% were male and 46.6% were female with mean age of years old. 45.8% of the patients had history of nonmechanical joint disease, 14.2% had history of rheumatological conditions in their family, and 30% had history of constitutional symptoms. 29.8% had positive joint dysfunction findings in their physical examination while 25.8% had anemia of chronic disease. Positive Rheumatoid factor (RF), anticyclic citrullinated peptide (CCP, ACPA), C-reactive protein (CRP), antinuclear antibody (ANA), abnormal urine and elevated erythrocyte sedimentation rate (ESR) were 34, 2.5, 26.7, 4.2, 5, and 36.7%, respectively. Antineutrophil cytoplasmic antibody (ANCA) and antiphospholipid (APL) were positive in a few cases. Conclusion. The findings of this study show immunologic bases for most patients with valvular heart diseases candidate for surgery. Undifferentiated connective tissue diseases may play an important role in the pathophysiology of valvular damage. 1. Introduction Valvular heart diseases (VHD) surround a number of common cardiovascular disorders that account for 15% of all cardiac surgical procedures in the world. Patients with VHD require intervention for improvement, relief, or valve replacement. One of the most important pathogeneses of coronary artery stenosis and VHD is inflammatory response of immune system. Prevalence and incidence of cardiovascular diseases resulting from rheumatologic disorders are increasing, however, advanced treatments which are now available [1–3]. Rheumatic diseases can be assumed by taking a clinical history and conducting thorough physical examination. Laboratory and radiographic investigations can help to diagnose more accurately; however, clinical skills and expertise are an essential factor in diagnosing undifferentiated connective tissue diseases. The frequent complaints of rheumatologic
Measurement of Relative Metastable Level Population of Gd Atoms in Hollow Cathode Lamp with LIF Method  [PDF]
Seyed Hassan, Ata Koohian
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.11011
Abstract: Relative metastable level population of metal plasma having low-lying metastable states departs from equi-librium value. It needs to be experimentally investigated. This paper reports the use of hollow cathode lamp based Laser Induced Fluorescence (LIF) spectroscopy technique to measure Relative metastable level popu-lation of metal in a plasma produced by a hollow cathode lamp. The relative population of ground state and 533 cm-1 levels of Gd atoms in hollow cathode lamp is measured with LIF method.
Spectral Method for Excitation Temperature Measurement in Hollow Cathode Lamp Plasma  [PDF]
Seyed Hassan Nabavi, Ata Koohian
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.21008
Abstract: In this paper the excitation temperature in a Gd hollow cathode lamp is measured for the first time. This measurement has made with considering of lamp spectra. One of the important measurements in plasma before using it as an interaction region with laser, is measuring of excitation temperature. Hollow cathode lamps are one of these regions. In this paper a Gd hollow cathode lamps with Ne as buffer gas is used as a plasma region. And the excitation temperature is measured. When the lamp current was 10 mA, the excitation temperature is measured 3000K.
Effects of drought stress on germination indices of corn hybrids (Zea mays L.)
International Journal of AgriScience , 2011,
Abstract: It is of prime necessity to establish genotypes resistant to drought stress; water deficit being one of the most common constraints of crop production in the world. In order to study the effect of drought stress on germination and early seedling growth of four hybrids of corn (namely KSC704, KSC475, KSC500 and Consor) using five concentrations of PEG 6000 (0, -4, -8, -12 and -16 bar) the experiment was conducted using a completely randomized design with four replications of seed technology in the laboratory at the College of Abuoraihan, University of Tehran. Analysis of variance results for each hybrid were indicated marked differences for, stress levels and for most investigated traits, which demonstrated high diversity among hybrids. This enabled us to screen drought tolerant cultivar to determine the hybrid most tolerant to drought stress conditions. Taking all traits into account it was found that KSC704 was the most resistant and KSC500 was the most sensitive.
Theoretical Foundations of "Competitive Team-Based Learning"
Seyed Mohammad Hassan Hosseini
English Language Teaching , 2010, DOI: 10.5539/elt.v3n3p229
Abstract: This paper serves as a platform to precisely substantiate the success of "Competitive Team-Based Learning" (CTBL) as an effective and rational educational approach. To that end, it brings to the fore part of the (didactic) theories and hypotheses which in one way or another delineate and confirm the mechanisms under which successful (language) learning occurs and then tries to correlate such mechanisms to those inherent in CTBL settings. This, bridging the gap between theory and practice, would, i hope, enable educators to better recognize the nature and the major goals of my instructional approach and consequently its pivotal significance especially for the present context of globalization not only as a sophisticated, modern, super-flexible, inclusive, and relevant and realistic approach to ELT/Education, but as a 'weapon' as well. My "Theory of Language" and also my "Multiple Input-Output Hypothesis", which are the axes of my approach, have also been thrown into sharp relief in this paper. The present conceptual paper, as such, is bound to benefit (ELT) teachers in terms of its contribution to their knowledge building, and critical, analytical, and creative thinking, and thus further pedagogical achievement and professional development.
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