Now showing items 1-14 of 14

    • Accelerated phase-cycled SSFP imaging with compressed sensing 

      Çukur, T. (Institute of Electrical and Electronics Engineers Inc., 2015)
      Balanced steady-state free precession (SSFP) imaging suffers from irrecoverable signal losses, known as banding artifacts, in regions of large B0 field inhomogeneity. A common solution is to acquire multiple phase-cycled ...
    • Choroid Plexus Papillomas in two siblings: Case report 

      Okay, O.; Dağlıoğlu, E.; Yakıcıer, Cengiz; Üren, Deniz; Dalgıç, A.; Ergüngör, F. (2009)
      Choroid plexus papilloma (CPP) is a rare, benign epithelial brain tumor of the nervous system seen particularly in infants. Familial cases are extremely uncommon. Some other form of malignant tumors was noted in the relatives ...
    • Convection-reaction equation based magnetic resonance electrical properties tomography (cr-MREPT) 

      Hafalir, F. S.; Oran, O. F.; Gurler, N.; Ider, Y. Z. (Institute of Electrical and Electronics Engineers Inc., 2014)
      Images of electrical conductivity and permittivity of tissues may be used for diagnostic purposes as well as for estimating local specific absorption rate distributions. Magnetic resonance electrical properties tomography ...
    • Design of a novel MRI compatible manipulator for image guided prostate interventions 

      Krieger, A.; Susil, R. C.; Ménard, C.; Coleman, J. A.; Fichtinger, G.; Atalar, Ergin; Whitcomb, L. L. (IEEE, 2005-02)
      This paper reports a novel remotely actuated manipulator for access to prostate tissue under magnetic resonance imaging guidance (APT-MRI) device, designed for use in a standard high-field MRI scanner. The device provides ...
    • Development of image reconstruction algorithms for three dimensional magnetic resonance-electrical impedance tomography 

      Onart, Serkan (Bilkent University, 2003)
      The electrical resistivity of biological tissues differ among various tissue types. Human body has a large resistivity contrast between a wide range of its tissues. The aim of this study is to reconstruct conductivity ...
    • Functional subdomains within human FFA 

      Çukur, T.; Huth, A. G.; Nishimoto, S.; Gallant, J. L. (Society for Neuroscience, 2013)
      The fusiform face area (FFA) is a well-studied human brain region that shows strong activation for faces. In functional MRI studies, FFA is often assumed to be a homogeneous collection of voxels with similar visual tuning. ...
    • Malignant-lesion segmentation using 4D co-occurrence texture analysis applied to dynamic contrast-enhanced magnetic resonance breast image data 

      Woods, B.J.; Clymer, B.D.; Kurc, T.; Heverhagen J.T.; Stevens, R.; Orsdemir, A.; Bulan O.; Knopp, M.V. (2007)
      Purpose: To investigate the use of four-dimensional (4D) co-occurrence-based texture analysis to distinguish between nonmalignant and malignant tissues in dynamic contrast-enhanced (DCE) MR images. Materials and Methods: ...
    • Manganese doped fluorescent paramagnetic nanocrystals for dual-modal imaging 

      Sharma, V. K.; Gokyar, S.; Kelestemur, Y.; Erdem, T.; Unal, E.; Demir, Hilmi Volkan (Wiley-VCH Verlag, 2014)
      In this work, dual-modal (fluorescence and magnetic resonance) imaging capabilities of water-soluble, low-toxicity, monodisperse Mn-doped ZnSe nanocrystals (NCs) with a size (6.5 nm) below the optimum kidney cutoff limit ...
    • Motion artifact reduction techniques in magnetic resonance imaging 

      Atalar, Ergin (Bilkent University, 1991)
      It is shown that the expansion/shrinkage and rotational motions of the body cause phase and amplitude distortions and non-rectangular sampling over the A:-domain. If these distortions are not compensated then the reconstructed ...
    • Neuro-ophthalmologic findings in humans with quadrupedal locomotion 

      Sarac O.; Gulsuner, S.; Yildiz-Tasci, Y.; Ozcelik, T.; Kansu, T. (2012)
      Purpose: To report the neuro-ophthalmologic findings in four patients from the same family with cerebellar ataxia, mental retardation, and dysequilibrium syndrome (CAMRQ)2 associated with quadrupedal locomotion. Method: A ...
    • A Respiratory Motion Artifact Reduction Method in Magnetic Resonance Imaging of the Chest 

      Atalar, Ergin; Onural, L. (1991)
      A respiratory motion artifact reduction method in magnetic resonance imaging is presented. The method is an image reconstruction algorithm based on the assumption that the respiratory motion of the chest is linear in space ...
    • Safety of metallic implants in magnetic resonance imaging 

      Ferhanoğlu, Onur (Bilkent University, 2005)
      Magnetic Resonance Imaging (MRI) is safe only if we take safety precautions. In the presence of a metallic implant inside the body, three types of magnetic fields encountered in MRI (Static magnetic field, radiofrequency ...
    • System for MR image-guided prostate interventions: Canine study 

      Susil, R. C.; Krieger, A.; Derbyshire, J. A.; Tanacs, A.; Whitcomb, L. L.; Fichtinger, G.; Atalar, Ergin (Radiological Society of North America, Inc.Radiological Society of North America, Inc., 2003)
      The purpose of this study was to demonstrate the use of a transrectal system that enables precise magnetic resonance (MR) image guidance and monitoring of prostate interventions. The system used a closed-bore 1.5-T MR ...
    • Tracking the position and rotational orientation of a catheter using a transmit array system 

      Celik, H.; Mahcicek, D. I.; Senel, O.; Wright, G. A.; Atalar, Ergin (IEEE, 2013)
      A new method for detecting the rotational orientation and tracking the position of an inductively coupled radio frequency (ICRF) coil using a transmit array system is proposed. The method employs a conventional body birdcage ...