Browsing by Author "Çukur, Tolga"
Now showing items 1-20 of 44
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3 boyutlu kartezyen olmayan paralel görüntülemede değişken görüntü alanına dayalı geriçatım
(IEEE, 2018)MRG’de yaygın olarak kullanılan geriçatım yöntemleri değişken yoğunluklu Kartezyen olmayan taramalara da uygulanabilmektedir; fakat bu durumda bu yöntemlerin genellikle yüksek hesaplama karmaşıklığı içeren çok ... -
Adaptive reconstruction for vessel preservation in unenhanced MR angiography
(IEEE, 2016)The image quality of unenhanced magnetic resonance angiography, which images blood vessels without contrast agents, is limited by constraints related to scan time. To address this problem, techniques that undersample ... -
Anatomical measurements correlate with individual magnetostimulation thresholds for kHz‐range homogeneous magnetic fields
(Wiley, 2020)Purpose: Magnetostimulation, also known as peripheral nerve stimulation (PNS), is the dominant safety constraint in magnetic resonance imaging (MRI) for the gradient magnetic fields that operate around 0.1–1 kHz, and for ... -
Biased competition in semantic representation during natural visual search
(Elsevier, 2020)Humans divide their attention among multiple visual targets in daily life, and visual search can get more difficult as the number of targets increases. The biased competition hypothesis (BC) has been put forth as an ... -
BSSFP görüntülemede eliptik sinyal modeline dayali eşzamanlı parametre tahmini
(IEEE, 2018)Faz döngülü dengeli kararlı-durum serbest devinim (bSSFP) görüntüleme tekniginde, görüntüde oluşan rezonans dışı frekanslardan kaynaklı sinyal düşüşlerinin uzamsal konumunu kaydırmak amacıyla her çekimde RF darbelerinin ... -
Category-selective top-down modulation in the fusiform face area of the human brain during visual search
(IEEE, 2017)Several regions in the ventral-temporal cortex of the human brain are thought to have representations of specific categories of objects. Furthermore, a distributed network of frontal and parietal brain regions is implicated ... -
Comparison of system-matrix-based and projection-based reconstructions for field free line magnetic particle imaging
(Infinite Science Publishing, 2017)In magnetic particle imaging (MPI), system sensitivity can be enhanced by scanning the sample along a field free line (FFL) instead of a field free point (FFP). FFL MPI data can then be processed via system-matrix or ... -
Compressed multi-contrast magnetic resonance image reconstruction using Augmented Lagrangian Method
(IEEE, 2016)In this paper, a Multi-Channel/Multi-Contrast image reconstruction algorithm is proposed. The method, which is based on the Augmented Lagrangian Method uses joint convex objective functions to utilize the mutual information ... -
Digital computation of fractional Fourier and linear canonical transforms and sparse image representation
(IEEE, 2018)Fast and accurate digital computation of the fractional Fourier transform (FRT) and linear canonical transforms (LCT) are of utmost importance in order to deploy them in real world applications and systems. The algorithms ... -
Diyalog tabanlı metinlerde konu değişimi tespiti
(IEEE, 2019-04)Son dönemde katlanarak gelişen haberleşme yöntemleri (internet, sosyal medya, akıllı telefon, vb.) sayesinde veriye ulaşmak ve paylaşmak kolaylaşmıştır. Özellikle son yıllarda sözlü ve yazılı paylaşım mecraları hızlı gelişim ... -
Enhanced phase-sensitive SSFP reconstruction for fat-water separation in phased-array acquisitions
(John Wiley and Sons Inc., 2016)Purpose: To propose and assess a method to improve the reliability of phase-sensitive fat–water separation for phased-array balanced steady-state free precession (bSSFP) acquisitions. Phase-sensitive steady-state free ... -
Factorized sensitivity estimation for artifact suppression in phase‐cycled bSSFP MRI
(Wiley, 2020)Objective: Balanced steady‐state free precession (bSSFP) imaging suffers from banding artifacts in the presence of magnetic field inhomogeneity. The purpose of this study is to identify an efficient strategy to reconstruct ... -
Fast system calibration with coded calibration scenes for magnetic particle imaging
(IEEE, 2019)Magnetic particle imaging (MPI) is a relatively new medical imaging modality, which detects the nonlinear response of magnetic nanoparticles (MNPs) that are exposed to external magnetic fields. The system matrix (SM) method ... -
Faz döngülü bSSFP görüntülemede T1 ve T2 haritalamaya parametre tahmini yaklaşımı
(IEEE, 2018)Faz döngülü dengeli kararlı-durum serbest devinim (bSSFP) sinyali eliptik sinyal modeline sahip olduğundan, T1 ve T2 relaksasyon zamanları tek bir faz döngülü bSSFP sekansından tahmin edilebilmektedir. Modelin parametreleri ... -
Fully automated gridding reconstruction for non-Cartesian x-space magnetic particle imaging
(IOP, 2019)Magnetic particle imaging (MPI) is a fast emerging biomedical imaging modality that exploits the nonlinear response of superparamagnetic iron oxide (SPIO) nanoparticles to image their spatial distribution. Previously, ... -
Functional subdomains within scene-selective cortex: parahippocampal place area, retrosplenial complex, and occipital place area
(Society for Neuroscience, 2016)Functional MRI studies suggest that at least three brain regions in human visual cortex-the parahippocampal place area (PPA), retrosplenial complex (RSC), and occipital place area (OPA; often called the transverse occipital ... -
Generating semantic similarity atlas for natural languages
(IEEE, 2018-12)Cross-lingual studies attract a growing interest in natural language processing (NLP) research, and several studies showed that similar languages are more advantageous to work with than fundamentally different languages ... -
Hadamard slice encoding for reduced-FOV diffusion-weighted imaging
(John Wiley & Sons, 2014)Methods: A 2D echo-planar RF pulse and matching multiband refocusing RF pulses were designed using the Shinnar-Le Roux algorithm to reduce band interference, and variable-rate selective excitation to shorten the pulse ... -
Huber function based reconstruction in accelerated phase-cycled bSSFP acquisitions for increased detection performance
(IEEE, 2017)Balanced steady-state free precession imaging suffers from irrecoverable signal losses, called banding artifacts. A common way to alleviate banding artifacts without sacrificing scan-efficiency is to use multiple-acquisition ... -
Image reconstruction for Magnetic Particle Imaging using an Augmented Lagrangian Method
(IEEE, 2017)Magnetic particle imaging (MPI) is a relatively new imaging modality that images the spatial distribution of superparamagnetic iron oxide nanoparticles administered to the body. In this study, we use a new method based on ...
