Person: ÖZDEMİR, HÜSEYIN
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Publication Metadata only Comparison of TOF MRA, Contrast-Enhanced MRA and Subtracted CTA from CTP in Residue Evaluation of Treated Intracranial Aneurysms(2018-01-01) Dundar, TOLGA TURAN; Kits, Serkan; Ozdemir, HÜSEYİN; Seyithanoglu, MEHMET HAKAN; Uysal, Omer; Toprak, HÜSEYİN; Ozek, ERDİNÇ; Alkan, ALPAY; DÜNDAR, TOLGA TURAN; ARALAŞMAK, AYŞE; ÖZDEMİR, HÜSEYIN; SEYİTHANOĞLU, MEHMET HAKAN; UYSAL, ÖMER; TOPRAK, HÜSEYİN; KİTİŞ, SERKAN; ÖZEK, ERDİNÇ; ALKAN, ALPAYAIM: To compare effectiveness of contrast-enhanced magnetic resonance angiography (CE-MRA), 3D-Time-of-flight magnetic resonance angiography (3D-TOF-MRA) and subtracted computed tomography angiography from computed tomography perfusion (sub-CTA) in residue evaluation of intracranial aneurysms treated either with coiling or clipping.Publication Metadata only CSF otorhinorrhea in a child with inner ear dysplasia: diagnosis with T2-weighted and intrathecal contrast-enhanced MR cisternography(2014-07-01) MEHDİ, Elnur; Alkan, ALPAY; YETIS, Huseyin; Aralasmak, AYŞE; Ozdemir, HÜSEYİN; ALKAN, ALPAY; ARALAŞMAK, AYŞE; ÖZDEMİR, HÜSEYINDuring the follow-up of recurrent pneumonia in a 9-month-old girl, rhinorrhea with discharge of a positional and intermittent nature was discovered. Radiological assessment was requested to detect any skull base openings and cerebrospinal fluid (CSF) leakage. T2-weighted MR cisternography showed bilateral inner ear dysplasia, communication of the internal auditory canal with the vestibule, and effusion in the right middle ear. Intrathecal contrast-enhanced MR cisternography revealed a CSF fistula from the right internal auditory canal to the Eustachian tube. The patient was operated upon on the right side, and the presence of a CSF leak near the oval window was confirmed. No adverse effects were seen during the short-term and long-term follow-up. Diagnosing this case required special attention, careful examination, and relevant investigations to find the site of CSF leakage in this patient with bilateral inner ear dysplasia.Publication Metadata only Cavernous Sinus: A Comprehensive Review of its Anatomy, Pathologic Conditions, and Imaging Features(2015-06-01) BAKAN, A. A.; Alkan, ALPAY; KURTCAN, SERPİL; ARALASMAK, AYŞE; TOKDEMIR, SEVİL; MEHDI, E.; OZDEMIR, HÜSEYİN; ALKAN, ALPAY; KURTCAN, SERPİL; ARALAŞMAK, AYŞE; TOKDEMİR, SEVİL; ÖZDEMİR, HÜSEYINThe purpose of this article was to review the anatomy of the cavernous sinus (CS), illustrate numerous lesions that can affect the CS, and emphasize the imaging characteristics for each lesion to further refine the differential diagnoses. The CS, notwithstanding its small size, contains a complicated and crucial network that consists of the carotid artery, the venous plexus, and cranial nerves. The wide-ranging types of pathologies that can involve the CS can be roughly classified as tumoral, congenital, infectious/inflammatory/granulomatous, and vascular. Conditions that affect the CS usually lead to symptoms that are similar to each other; thus, for diagnosis, imaging procedures are required. Radiological evaluations are also required to detect pre- and postoperative CS invasion. Magnetic resonance imaging, which can be supplemented with thin-section contrast-enhanced sequences, is the preferred imaging technique for evaluating the CS. For correct diagnosis of CS lesions and accurate evaluations of CS invasions, it is essential to carefully analyze the anatomical structures within the CS and to acquire precise knowledge about the imaging features of CS lesions, which may frequently overlap.Publication Metadata only Hyperperfusion in Carotid Stenting Patients(2015-05-01) Aralasmak, AYŞE; ATAY, Musa; Toprak, HÜSEYİN; OZDEMIR, Tugce; Asil, TALİP; GOKTEKIN, Omer; MEHDI, Elnur; Ozdemir, HÜSEYİN; Alkan, ALPAY; ARALAŞMAK, AYŞE; TOPRAK, HÜSEYİN; ASİL, TALIP; ÖZDEMİR, HÜSEYIN; ALKAN, ALPAYPurpose: This study aimed to define hyperperfusion in carotid stenting patients without excluding patients with stenosis on the contralateral side.Publication Metadata only Diffusion tensor imaging findings of the brainstem in subjects with tonsillar ectopia(2018-03-01) Kurtcan, SERPİL; Alkan, ALPAY; YETIS, Huseyin; TÜZÜN, Umit; Aralasmak, AYŞE; Toprak, HÜSEYİN; Ozdemir, HÜSEYİN; KURTCAN, SERPİL; ALKAN, ALPAY; ARALAŞMAK, AYŞE; TOPRAK, HÜSEYİN; ÖZDEMİR, HÜSEYINWe aimed to evaluate the differences between apparent diffusion coefficient (ADC), fractional anisotropy (FA), axial diffusivity (AD), and radial diffusivity (RD) values obtained from different cranial sites in subjects with Chiari I Malformation (CM-I) and borderline tonsillar ectopia (BTE), and to determine correlations between diffusion tensor imaging (DTI) metrics and the severity of tonsillar ectopia. A total of 73 subjects with CM-I and BTE and 35 control underwent MRI and DTI. In our study, ADC values measured from the level of medulla oblongata and the RD values measured in middle cerebellar peduncles, thalamus, and globus pallidus were higher in CM-I patients than in controls. FA values at the medulla oblongata level and AD values at the medulla oblongata and pons level higher in patients with CM-I. ADC and AD values measured at the pons level were higher in BTE subjects than in controls. Compared with BTE, the CM-I subjects- ADC values at the medulla oblongata and AD values at the pons level were higher. In addition, FAs at the pons and medulla oblongata level were higher. At the medulla oblongata level, a positive correlation was observed between ADC and the size of tonsillar ectopia. AD and FA values measured at the level of medulla oblongata and pons were positively correlated with the size of tonsillar ectopia. These findings may be related to the severity of microstructural changes involving neuronal tracts at the brainstem level due to tonsillar ectopia. DTI may be useful in determining the extent of microstructural changes at the tissue level in subjects with tonsillar ectopia.Publication Metadata only The Contribution of DTI in Determining the Relationship of Epilepsy and Brain Lesions in Children with Tuberous Sclerosis(2018-01-01) Kurtcan, SERPİL; Alkan, ALPAY; GULER, Serhat; Yesil, GÖZDE; Toprak, HÜSEYİN; Tüzün, Umit; YETIS, Huseyin; Aralasmak, AYŞE; Ozdemir, HÜSEYİN; Iscan, AKIN; KURTCAN, SERPİL; ALKAN, ALPAY; YEŞİL, GÖZDE; TOPRAK, HÜSEYİN; ARALAŞMAK, AYŞE; ÖZDEMİR, HÜSEYIN; İŞCAN, AKINBackground: In spite of the fact that advanced neuroimaging applications are used for the evaluation of Tuberous Sclerosis (TS) patients, a few studies analyzed relationship between the measurements of DTI (diffusion tensor imaging) and neurological findings.Publication Metadata only Comparison of Delay-Sensitive and Delay-Insensitive Computed Tomography Perfusion Methods in Acute Ischemic Stroke and Their Variability According to Location of Critical Vascular Stenosis(2018-01-01) KARAALIOGLU, Banu; Aralasmak, AYŞE; Toprak, HÜSEYİN; Kolukisa, MEHMET; Uysal, Omer; Yildiz, Seyma; Ozdemir, HÜSEYİN; Alkan, ALPAY; ARALAŞMAK, AYŞE; TOPRAK, HÜSEYİN; KOLUKISA, MEHMET; UYSAL, ÖMER; YILDIZ, ŞEYMA; ÖZDEMİR, HÜSEYIN; ALKAN, ALPAYObjective The aim of this study was to evaluate visual and quantitative differences of delay-sensitive (singular value deconvolution [SVD]) and delay-insensitive (SVD+) computed tomography perfusion (CTP) postprocessing methods in acute ischemic stroke patients and their variability according to location of critical stenosis.