Now showing items 1-20 of 49

    • 4,8 T/m manyetik parçacık görüntüleme tarayıcı tasarımı ve yapımı 

      Ütkür, Mustafa; Muslu, Yavuz; Sarıtaş, Emine Ülkü (IEEE, 2018)
      Manyetik Parçacık Görüntüleme (MPG), ilk yayımlandığı 2005 yılından bu yana hızla gelişerek anjiyografi, kök hücre takibi ve kanser görüntüleme gibi uygulama alanlarında ciddi ilerlemeler kaydetmiştir. İyonlaştırıcı ışıma ...
    • Adaptive reconstruction for vessel preservation in unenhanced MR angiography 

      Ilıcak, Efe; Çetin, S.; Sarıtaş, Emine Ülkü; Ünal, G.; Çukur, Tolga (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 

      Demirel, Ömer Burak; Kılıç, Toygan; Çukur, Tolga; Sarıtaş, Emine Ülkü (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 ...
    • Anisotropic dynamics of a self-assembled colloidal chain in an active bath 

      Aporvari, Mehdi Shafiei; Utkur, Mustafa; Sarıtaş, Emine Ülkü; Volpe, G.; Stenhammar, J. (Royal Society of Chemistry, 2020)
      Anisotropic macromolecules exposed to non-equilibrium (active) noise are very common in biological systems, and an accurate understanding of their anisotropic dynamics is therefore crucial. Here, we experimentally investigate ...
    • Aqueous paramagnetic solutions for MRI phantoms at 3 T: a detailed study on relaxivities 

      Thangavel, Kalaivani; Sarıtaş, Emine Ülkü (Turkiye Klinikleri Journal of Medical Sciences, 2017)
      Phantoms with known T1 and T2 values that are prepared using solutions of easily accessible paramagnetic agents are commonly used in MRI imaging centers, especially with the goal of validating the accuracy of quantitative ...
    • Blind source separation for multi-color MPI 

      Kurt, Semih; Muslu, Yavuz; Sarıtaş, Emine Ülkü (International Journal on Magnetic Particle Imaging, 2020)
      In magnetic particle imaging (MPI), different magnetic nanoparticles (MNPs) in the same field-of-view can be distinguished via color-MPI techniques. Existing system-function-based techniques require extensive calibration ...
    • Calibration-free relaxation-based multi-color magnetic particle imaging 

      Muslu, Yavuz; Utkur, Mustafa; Demirel, Ömer Burak; Sarıtaş, Emine Ülkü (Institute of Electrical and Electronics Engineers, 2018)
      Magnetic particle imaging (MPI) is a novel imaging modality with important potential applications, such as angiography, stem cell tracking, and cancer imaging. Recently, there have been efforts to increase the functionality ...
    • Coded scenes for fast system calibration in magnetic particle imaging 

      Ilbey, S.; Top, C. B.; Güngör, A.; Sarıtaş, Emine Ülkü; Güven, E. (IEEE, 2018)
      Magnetic nanoparticle (MNP) agents have a wide range of clinical application areas for both imaging and therapy. MNP distribution inside the body can be imaged using Magnetic Particle Imaging (MPI). For MPI image reconstruction ...
    • Comparison of system-matrix-based and projection-based reconstructions for field free line magnetic particle imaging 

      Ilbey, S.; Top, C. B.; Güngör, A.; Çukur, Tolga; Sarıtaş, Emine Ülkü; Güven, H. E. (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 ...
    • DC shift based image reconstruction for magnetic particle imaging 

      Sarıca, Damla; Demirel, Ömer Burak; Sarıtaş, Emine Ülkü (IEEE, 2017)
      Magnetic Particle Imaging (MPI) is a new imaging technology that images the spatial distribution of iron oxide nanoparticles. Since the magnetic field strength that can be safely applied in MPI is limited, the field-of-view ...
    • Design of a doubly tunable gradiometer coil 

      Çağıl, Ahmet Rahmetullah; Taşdelen, Bilal; Sarıtaş, Emine Ülkü (Infinite Science Publishing, 2020)
      In a magnetic particle imaging (MPI) scanner, utilizing a tunable gradiometer receive coil can aid in achieving greater degree of decoupling of direct feedthrough signal. However, such a coil can be hard to tune since a ...
    • Design of a magnetostimulation head coil with rutherford cable winding 

      Özaslan, Ali Alper; Çağıl, Ahmet Rahmetullah; Graeser, M.; Knopp, T.; Sarıtaş, Emine Ülkü (Infinite Science Publishing, 2020)
      Magnetic Particle Imaging (MPI) uses sinusoidal drive fields to excite the magnetic nanoparticles. These time-varying magnetic fields form electric fields within the body, which in turn can cause peripheral nerve stimulation, ...
    • Development of tailored SPION-PNIPAM nanoparticles by ATRP for dually responsive doxorubicin delivery and MR imaging 

      Yar, Y.; Khodadust, R.; Akkoç, Y.; Utkur, Mustafa; Sarıtaş, Emine Ülkü; Gözüaçık, D.; Acar, H. Y. (Royal Society of Chemistry, 2018)
      Biocompatible, colloidally stable and ultra-small Fe3O4 nanoparticles (SPIONs) coated with poly(N-isopropylacrylamide) (PNIPAM) were synthesized via surface-initiated ATRP (atom transfer radical polymerization) to prevent ...
    • Diffusion tensor imaging and T2 relaxometry of bilateral lumbar nerve roots: feasibility of in‐plane imaging 

      Karampinos, D.; Melkus, G.; Shepherd, T.; Banerjee, S.; Sarıtaş, Emine Ülkü; Shankaranarayanan, A.; Hess, C.; Link, T.; Dillon, W.; Majumdar, S. (Wiley, 2013)
      Lower back pain is a common problem frequently encountered without specific biomarkers that correlate well with an individual patient's pain generators. MRI quantification of diffusion and T2 relaxation properties may ...
    • Effects of drive field parameters in magnetic particle imaging: A relaxometer study 

      Bozkurt, Ecem; Ütkür, Mustafa; Muslu, Yavuz; Sarıtaş, Emine Ülkü (IEEE, 2018)
      In Magnetic Particle Imaging (MPI), it is possible to acquire signal from the nanoparticles via applying oscillating magnetic fields in the 1 kHz -150 kHz frequency range. Though 25 kHz is commonly used, there are not ...
    • Effects of duty cycle on magnetostimulation thresholds in MPI 

      Demirel, Omer Burak; Sarıtaş, Emine Ülkü (Infinite Science Publishing, 2017)
      Magnetic Particle Imaging (MPI) relies on time-varying magnetic fields to generate an image of the spatial distribution of superparamagnetic iron oxide nanoparticles. However, these oscillating magnetic fields form electric ...
    • Enhanced phase-sensitive SSFP reconstruction for fat-water separation in phased-array acquisitions 

      Yılmaz, Özgür; Sarıtaş, Emine Ülkü; Çukur, Tolga (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 ...
    • Fast system calibration with coded calibration scenes for magnetic particle imaging 

      İlbey, Serhat; Top, C. B.; Güngör, Alper; Çukur, Tolga; Sarıtaş, Emine Ülkü; Güven, H. Emre (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 ...
    • Fully automated gridding reconstruction for non-Cartesian x-space magnetic particle imaging 

      Özaslan, Ali Alper; Alacaoğlu, Ahmet; Demirel, Ömer Burak; Çukur, Tolga; Sarıtaş, Emine Ülkü (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, ...
    • Full‐brain coverage and high‐resolution imaging capabilities of passband b‐SSFP fMRI at 3T 

      Lee, J. H.; Dumoulin, S.; Sarıtaş, Emine Ülkü; Glover, G.; Wandell, B.; Nishimura, D.; Pauly, J. (Wiley‐Liss, Inc., 2008)
      Passband balanced-steady-state free precession (b-SSFP)fMRI is a recently developed method that utilizes the passband(flat portion) of the b-SSFP off-resonance response to measureMR signal changes elicited by changes in ...