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Search Results: 1 - 10 of 297922 matches for " J. Jalal Shokouki "
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The Role of Imaging in Craniofacial Anomalies
P. Alipour,J. Jalal Shokouki
Iranian Journal of Radiology , 2008,
Abstract: It is important to know craniofacial anatomy in infancy for early detection of craniofacial anomalies, to help the surgeon's decision ,for repair and increase the patients, quality of life .In this regard, imaging has the major role in preoperative diagnostic maping and post operative follow up repair."nWe are going to show the normal craniofacial anatomy appearances in infancy in order to detect early craniofacial anomaly and syndromatic craniosynostosis with plain skull X-ray and CT scan reconstruction imaging.
Imaging Classification of Cervical Lymph Nodes
Gh. Bakhshandepour,J. Jalal Shokouki
Iranian Journal of Radiology , 2008,
Abstract: Nearly four decades, Rouviere classification, which is a clinically based system, was the only system for cervical adenopathy classification. The best possible classification of cervical nodal disease may be accomplished by using both clinical palpation and also informations provided by imaging, because imaging can reveal clinically silent lymph nodes. most head and neck tumors spread to the neck nodes as a part of their natural history ,depending on the primary site. Up to 80% of patients with upper aerodigestive mucosal malignancies will have cervical nodal metastasis"nat presentation.The occurrence of nodal metastasis has a profound effect on the management and prognosis of the patients .nodal metastasis is the most important prognostic factor in squamous cell carcinoma of the head and neck. In general it decreases the overall survival by half, and extracapsular spread worsens the prognosis by another half. Our purpose in this presentation is to review imaging classification of cervical lymph nodes.
P. Alipour,J. Jalal Shokouki,F. Rohani,Dr. Behshad
Iranian Journal of Radiology , 2008,
Abstract: The condition is confusing appearance of external genitalia in fetus ultrasonography and after birth childhood and adults. There are two main condi-tions:"nA: impossible to determine if fetus is male or female."nB: It needs more investigation after birth to deter-mine internal genitalia; prostate for male and uterus and also ovaries for female by sonography and MRI."nThere are two final steps conducting intersex cases toward being a male or female:"nA: how is Genotype"nB: how is emotions and feelings, (is she or he wants to be a man or woman?) Studied cases are:"n1) A beautiful well developed 21 years old girl that her external genitalia showed a normal size penis, no testis but internal genitalia showed a normal prostate, no ovaries and no uterus. Her genotype was XY."n2) A teen girl 16 years old, Normal breasts and no menstruation. Internal genitalia showed no "nuterus and no ovaries on MRI and US, genotype was XY."n3) A 11 years old female with developed breasts but no menstruation, normal female external genitalia but no ovaries, uterus and no prostate."n4) Other case reports will be introduced during presentation. Our team will discuss about organic, radiologic, social and psychologic problems of intersex.
Variations of Spleen Site: Introduction
J. Jalal Shokouki,A. A. Ameri,Gh. Bakhshandepour,H. Mohammadpour
Iranian Journal of Radiology , 2008,
Abstract: Background/Objective: It is important to keep the spleen with the help of imaging in today world. We can see variations like asplenia, polysplenia (2 -16 pieces) at MRI. Normal spleen has a size up to 1cm and less than that is asplenia or atrophy of spleen. It is common to see large vessels anomalies. We can evaluate it after spleen surgical removal, also spleno-sis, and accessory spleen. The aim of this presentation is to report variations of spleen site on CT."nPatients and Methods: All the 3000 cases had sono-graphy report or CT. Some of them had MRI report. All the patients received oral or intravenous contrast media."nResults: Among 3000 CT, there were 240 cases of ac-cessory spleen, two cases of poly spleen, one case of pelvic spleen, 90 cases of spleen metastasis which were mostly lymphoma, 25 cases of Hydatid cyst, three cases of simple cysts, three cases of small spleen (1-6 cm), two cases of huge splenomegaly, 14 cases of spleen calcifications, 15 cases of accessory spleen which in one case it was more than 3.5cm. There were five cases with spleen measured 8 -12 cm in di-ameter which were after splenectomy due to Thalas-semia major and it was as a result of enlargement of accessory spleen which was not diagnosed, also two cases of multi- accessory spleen were found. Other complications of spleen were five cases of abscess and infections, 12 cases of spleen infarction, 36 cases of spleen rupture, two cases of cavernous hemangioma and one case of capillary hemangioma."nConclusion:1-Sonography had better accuracy in the case of internal texture, tumors and cysts in compari-son with CT. 2-CT had better accuracy than sonogra-phy at calcification, an splenic surroundings, spleen infarction and splenic vessels investigation. 3-CT is mandatory for major thalassemia and the ones who must go under splenectomy. Also CT is necessary for revealing accessory spleen which may be missed at sonography. 4- For finding pelvic spleen CT, CTA and MRI are possible but sonography and doppler are difficult. 5-RN Scan has the minimum role at spleen imaging.
Unusual Neuroimaging Presentation of Cerebral Venus Sinus Thrombosis in 40 Patients
Gh. Bakhshandepour,H. Abdolhusseinpour,S. Shahbaygi,J. Jalal Shokouki
Iranian Journal of Radiology , 2008,
Abstract: Background/Objective: This study has been per-formed to investigate the unusual imaging presenta-tion of the cerebral venous sinus thrombosis."nPatients and Methods: The data was analyzed retro-spectively from all patients with evidences of dural vein thrombosis in MRI, referred to two medical im-aging centers in Tehran during four years period (2002 to 2006)."nResults: Thirty-three women and seven men (22 to 70 years old) with imaging findings of Dural vein thrombosis were relatively classic. However in sev-eral cases the diagnoses were incorrect, because of the emergency state of the patients and the images were not reported by radiologist and treatment was started by the physician. "nConclusion: Cerebral venous sinus thrombosis have a wide spectrum of symptoms and signs such as head-ache, vomiting, vertigo, coma, focal neurological deficits including seizure and paresis, which could produce several imaging presentations from a normal MRI to evidences of SAH, AVM, Tumor-like lesions, metastases, metabolic disorders, Brain TB and etc. Awareness, understanding, and also recognition of these imaging presentations may permit the radiolo-gist to play a significant role in the prevention of un-wanted surgical interventions or extensive diagnostic evaluation procedures.
MRI Could Be Changed Vertebral Body Fracture Classification
J. Jalal Shokouki,A. Rahimzadeh,M. Khadivi,A. A. Ameri
Iranian Journal of Radiology , 2008,
Abstract: Background/Objective: Evaluation of spinal column fracture or trauma with MRI in more than two years among 500 patients can change classifications of frac-tures that is important because of intervention ther-apy methods like vertebroplasty and kyfoplasty. As there are changes at Salter harrie fractures, classifica-tion, treatments` way, and management of vertebral body fracture will change. Also MRI can show inter-nal parts ruptures, vessel punctures, and show the size of hematomas."nPatients and Methods: Fifty patients at two imaging centers have been tested with MRI 1.5 tesla machines from GE and Siemens with superficial coil, and all of them had vertebral column trauma. We used T1 and T2 sagital and in some cases STIR or FAT SAT sagital. "nResults: Among our cases, 147 had fractures, and two cases had spinal punctures. The most common from of fractures were anterior wedging with compression of upper endplate. "nThe maximum fractures were five in a single trauma and mostly there were 2-3 fractures in a single trau-ma. Most of the fractures did not appear at X-ray, but they revealed at MRI specially with STIR pulse."nConclusion: 1) MRI especially STIR pulse is definite and sensitive to compression even in slight among which can be hidden from X-ray and CT. 2) Findings number and form of fractures with MRI, comparing with clinical signs will change classification of verte-bral fractures that leads to the better treatment re-sults. 3) CT is better for vertebral appendix fractures. 4) MRI is better for seeing complications of soft tis-sue. 5) MRI is better for siagnosins of old complica-tions and old fractures.
Thalassemic Imaging
A. A. Ameri,J. Jalal Shokouki,M. H. Bagheri,F. Habibzadeh
Iranian Journal of Radiology , 2008,
Abstract: Clinical, laboratory, and imaging tests can help us to diagnose thalassemic patients (both minor, and major).These can help them relatively for normal life in minor group, and almost a good life in major group until third or forth decade of their lives. The oldest patient in our investigation was 35 years old who has a very big head (round the head was twice a normal adult).Eighteen patients of minor group or inter-mediate, referred to us due to discal herniation,MS, quadriplegia, and etc. None of these patients were diagnosed as Thalassemia or they were in minor group of Thalassemia. Their signs were because of extramedullary hematopoiesis beside spinal cord compression. "Eight cases were introduced at ECR, and published at ICR"."nAll patients both diagnosed and non-diagnosed, were investigated by different pulses of MRI, and compared with Radiology, and CT. There was no report for MRI without seeing radiology. All patients were tested by ultra field, low field, mid field and high field."nFinally, 1) MRI helps a lot to diagnose minor cases or non-diagnosed cases. 2) MRI helps to diagnose neurologic complications and it is a selected way. 3) It is mandatory to evaluate accessory spleen at major cases before Splenectomy, otherwise six months later there will manifest hyperactivity of spleen, and accessory spleen will become 8 to 12 cm larger, which CT is the best way of evaluation in these cases. 4) Radiology has its value at major group. 5) It is mandatory for paravertebral, and intradural extramedullary, at ages between 10 to 22 and it is the best point. The most interesting images among 35 patients will be shown.
On the Zeros of Daubechies Orthogonal and Biorthogonal Wavelets  [PDF]
Jalal Karam
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.37116
Abstract: In the last decade, Daubechies’ wavelets have been successfully used in many signal processing paradigms. The construction of these wavelets via two channel perfect reconstruction filter bank requires the identification of necessary conditions that the coefficients of the filters and the roots of binomial polynomials associated with them should exhibit. In this paper, orthogonal and Biorthogonal Daubechies families of wavelets are considered and their filters are derived. In particular, the Biorthogonal wavelets Bior3.5, Bior3.9 and Bior6.8 are examined and the zeros distribution of their polynomials associated filters are located. We also examine the locations of these zeros of the filters associated with the two orthogonal wavelets db6 and db8.
Simulation of Gegenbauer Processes using Wavelet Packets
Jér?me Collet,Jalal Fadili
Mathematics , 2006,
Abstract: In this paper, we study the synthesis of Gegenbauer processes using the wavelet packets transform. In order to simulate a 1-factor Gegenbauer process, we introduce an original algorithm, inspired by the one proposed by Coifman and Wickerhauser [1], to adaptively search for the best-ortho-basis in the wavelet packet library where the covariance matrix of the transformed process is nearly diagonal. Our method clearly outperforms the one recently proposed by [2], is very fast, does not depend on the wavelet choice, and is not very sensitive to the length of the time series. From these first results we propose an algorithm to build bases to simulate k-factor Gegenbauer processes. Given its practical simplicity, we feel the general practitioner will be attracted to our simulator. Finally we evaluate the approximation due to the fact that we consider the wavelet packet coefficients as uncorrelated. An empirical study is carried out which supports our results.
Peculiarities of CO2 exchange in soybean genotypes contrasting in grain yield  [PDF]
Jalal A. Aliyev
Advances in Biological Chemistry (ABC) , 2012, DOI: 10.4236/abc.2012.23039
Abstract: The peculiarities of leaf carbon dioxide gas exchange in soybean genotypes grown in field over a large area and contrasting in duration of vegetation, photosynthetic traits and productivity were studied. Varietal differences in the daily and ontogenetic changes in photosynthesis and photorespiration were identified. It was established that the period of the high activity of photosynthetic apparatus in high productive soybean genotypes lasts for a longer time. The photosynthetic rate and the rate of CO2 release in light due to photorespiration are higher in high productive genotypes. A value of photorespiration in contrasting soybean genotypes constitutes about 28% - 35% of photosynthetic rate. The ratio of gross photosynthesis to photorespiration in genotypes with different productivity is constant enough during ontogenesis, indicating a direct positive correlation between gross photosynthesis and photorespiration. Therefore, contrary to conception arisen during many years on the waste-fulness of photorespiration, taking into account the versatile investigations on different aspects of photo-respiration, it was proved that photorespiration is one of the evolutionarily developed vital metabolic processes in plants and the attempts to reduce this process with the purpose of increasing the crop productivity are inconsistent.
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