Searched for: subject:"Magnetic%5C+resonance%5C+imaging"
(1 - 20 of 36)

Pages

document
De Vos, Bart (author), Fuchs, P.S. (author), O'Reilly, Thomas (author), Webb, A. (author), Remis, R.F. (author)
In this article, we design and construct gradient coils for a Halbach permanent-magnet array magnetic resonance (MR) scanner. The target field method, which is widely applied for the case of axial static magnetic fields, has been developed for a transverse static magnetic field as produced by a Halbach permanent-magnet array. Using this...
journal article 2020
document
Timbergen, Milea J.M. (author), Starmans, Martijn P.A. (author), Padmos, Guillaume A. (author), Grünhagen, Dirk J. (author), van Leenders, Geert J.L.H. (author), Hanff, D. F. (author), Niessen, W.J. (author), Klein, S. (author), Visser, J.J. (author)
Purpose: Diagnosing desmoid-type fibromatosis (DTF) requires an invasive tissue biopsy with β-catenin staining and CTNNB1 mutational analysis, and is challenging due to its rarity. The aim of this study was to evaluate radiomics for distinguishing DTF from soft tissue sarcomas (STS), and in DTF, for predicting the CTNNB1 mutation types....
journal article 2020
document
van Valenberg, W. (author), Klein, S. (author), Vos, F.M. (author), Koolstra, Kirsten (author), van Vliet, L.J. (author), Poot, D.H.J. (author)
Quantitative MRI methods that estimate multiple physical parameters simultaneously often require the fitting of a computational complex signal model defined through the Bloch equations. Repeated Bloch simulations can be avoided by matching the measured signal with a precomputed signal dictionary on a discrete parameter grid (i.e. lookup table...
journal article 2020
document
Demirel, Omer Burak (author), Weingärtner, S.D. (author), Moeller, Steen (author), Akcakaya, Mehmet (author)
Perfusion cardiac MRI (CMR) is a radiation-free and noninvasive imaging tool which has gained increasing interest for the diagnosis of coronary artery disease. However, resolution and coverage are limited in perfusion CMR due to the necessity of single snap-shot imaging during the first-pass of a contrast agent. Simultaneous multi-slice (SMS)...
conference paper 2020
document
Wahlström, Johan (author), Kok, M. (author), Porto Buarque de Gusmão, Pedro (author), Abrudan, Traian E. (author), Trigoni, Niki (author), Markham, Andrew (author)
Magneto-inductive navigation is an inexpensive and easily deployable solution to many of today’s navigation problems. By utilizing very low frequency magnetic fields, magneto-inductive technology circumvents the problems with attenuation and multipath that often plague competing modalities. Using triaxial transmitter and receiver coils, it is...
journal article 2020
document
Berger, Judith P. (author), Rhemrev, Johann (author), Smeets, Maddy (author), Henneman, Onno (author), English, James (author), Jansen, F.W. (author)
OBJECTIVES: To assess the added value of magnetic resonance imaging (MRI) after dynamic transvaginal ultrasound (TVUS) in the diagnostic pathway for preoperative staging of pelvic endometriosis. METHODS: A prospective observational study was conducted between April 22, 2014, and May 1, 2015. During that period, 363 patients with a clinical...
journal article 2019
document
Fauzia, R.P. (author), Denkova, A.G. (author), Djanashvili, K. (author)
Radiation therapy has made tremendous progress in oncology over the last decades due to advances in engineering and physical sciences in combination with better biochemical, genetic and molecular understanding of this disease. Local delivery of optimal radiation dose to a tumor, while sparing healthy surrounding tissues, remains a great...
journal article 2019
document
Leijsen, R.L. (author), Fuchs, P.S. (author), Brink, Wyger (author), Webb, A. (author), Remis, R.F. (author)
The main objective of electrical-property tomography (EPT) is to retrieve dielectric tissue parameters from B <sub>1</sub> <sup>+</sup> data as measured by a magnetic-resonance (MR) scanner. This is a so-called hybrid inverse problem in which data are defined inside the reconstruction domain of interest. In this paper, we discuss recent and...
journal article 2019
document
Rassam, F. (author), Zhang, T. (author), Cieslak, K. P. (author), Lavini, C. (author), Stoker, J. (author), Bennink, R. J. (author), van Gulik, T. M. (author), van Vliet, L.J. (author), Runge, J. H. (author), Vos, F.M. (author)
Objectives: To compare Gd-EOB-DTPA dynamic hepatocyte-specific contrast-enhanced MRI (DHCE-MRI) with <sup>99m</sup> Tc-mebrofenin hepatobiliary scintigraphy (HBS) as quantitative liver function tests for the preoperative assessment of patients undergoing liver resection. Methods: Patients undergoing liver surgery and preoperative assessment...
journal article 2019
document
de Leeuw den Bouter, M.L. (author), van Gijzen, M.B. (author), Remis, R.F. (author)
We consider the MRI physics in a low-field MRI scanner, in which permanent magnets are used to generate a magnetic field in the millitesla range. A model describing the relationship between measured signal and image is derived, resulting in an ill-posed inverse problem. In order to solve it, a regularization penalty is added to the least-squares...
journal article 2019
document
van Gemert, Jeroen (author), Brink, Wyger (author), Webb, A. (author), Remis, R.F. (author)
Purpose: High-permittivity materials in the form of flexible “dielectric pads” have proved very useful for addressing RF inhomogeneities in high field MRI systems. Finding the optimal design of such pads is, however, a tedious task, reducing the impact of this technique. We present an easy-to-use software tool which allows researchers and...
journal article 2019
document
van Gemert, J.H.F. (author), Brink, W.M. (author), Webb, A. (author), Remis, R.F. (author)
Inhomogeneities in the transmit radio frequency magnetic field ( {\text{B}}-{1}^{+} ) reduce the quality of magnetic resonance (MR) images. This quality can be improved by using high-permittivity pads that tailor the {\text{B}}-{1}^{+} fields. The design of an optimal pad is application-specific and not straightforward and would therefore...
journal article 2018
document
Puylaert, Carl A.J. (author), Tielbeek, Jeroen A.W. (author), Schüffler, Peter J. (author), Nio, C. Yung (author), Horsthuis, Karin (author), Mearadji, Banafsche (author), Ponsioen, Cyriel Y. (author), Vos, F.M. (author), Stoker, Jaap (author)
Purpose: The purpose of the study was to compare the performance of contrast-enhanced (CE)-MRI and diffusion-weighted imaging (DW)-MRI in grading Crohn’s disease activity of the terminal ileum. Methods: Three readers evaluated CE-MRI, DW-MRI, and their combinations (CE/DW-MRI and DW/CE-MRI, depending on which protocol was used at the start of...
journal article 2018
document
van der Heijden, R.A.J. (author), Poot, D.H.J. (author), Ekinci, Melek (author), Kotek, Gyula (author), van Veldhoven, Peter L.J. (author), Klein, S. (author), Verhaar, Jan A.N. (author), Krestin, Gabriel P. (author), Bierma-Zeinstra, Sita M.A. (author), van Middelkoop, Marienke (author), Oei, Edwin H.G. (author)
Background: Altered perfusion might play an important role in the pathophysiology of patellofemoral pain (PFP), a common knee complaint with unclear pathophysiology. Purpose: To investigate differences in dynamic contrast-enhanced (DCE)-MRI perfusion parameters between patients with PFP and healthy control subjects. Population/Subjects...
journal article 2018
document
Fuchs, P.S. (author), Mandija, Stefano (author), Stijnman, Peter R.S. (author), Brink, Wyger M. (author), van den Berg, Cornelis A.T. (author), Remis, R.F. (author)
In this paper, we present an efficient dedicated electrical properties tomography (EPT) algorithm (called first-order current density EPT ) that exploits the particular radio frequency field structure, which is present in the midplane of a birdcage coil, to reconstruct conductivity and permittivity maps in this plane from B ^ + 1 data. The...
journal article 2018
document
Puylaert, Carl A.J. (author), Schüffler, Peter J. (author), Naziroglu, Robiel E. (author), Tielbeek, Jeroen A.W. (author), Li, Z. (author), Makanyanga, Jesica C. (author), Tutein Nolthenius, Charlotte J. (author), Nio, C. Yung (author), Pendsé, Douglas A. (author), Menys, Alex (author), Ponsioen, Cyriel Y. (author), Atkinson, David (author), Forbes, Alastair (author), Buhmann, Joachim M. (author), Fuchs, Thomas J. (author), Hatzakis, Haralambos (author), van Vliet, L.J. (author), Stoker, Jaap (author), Taylor, Stuart A. (author), Vos, F.M. (author)
Rationale and Objectives: The objective of this study was to develop and validate a predictive magnetic resonance imaging (MRI) activity score for ileocolonic Crohn disease activity based on both subjective and semiautomatic MRI features. Materials and Methods: An MRI activity score (the “virtual gastrointestinal tract [VIGOR]” score) was...
journal article 2018
document
Leijsen, R.L. (author), Brink, Wyger M. (author), van den Berg, Cornelis A.T. (author), Webb, A. (author), Remis, R.F. (author)
Contrast source inversion &amp;#x2013; electrical properties tomography (CSI-EPT) is an iterative reconstruction method to retrieve the electrical properties (EPs) of tissues from MR data. The method is based on integral representations of the electromagnetic (EM) field and has been shown to allow EP reconstructions of small structures as...
journal article 2018
document
Ando, Toshio (author), Bhamidimarri, Satya Prathyusha (author), Brending, Niklas (author), Colin-York, H. (author), Collinson, Lucy (author), De Jonge, Niels (author), De Pablo, P. J. (author), Debroye, Elke (author), Eggeling, Christian (author), Franck, Christian (author), Hoogenboom, J.P. (author)
Developments in microscopy have been instrumental to progress in the life sciences, and many new techniques have been introduced and led to new discoveries throughout the last century. A wide and diverse range of methodologies is now available, including electron microscopy, atomic force microscopy, magnetic resonance imaging, small-angle x...
review 2018
document
van der Lee, Sven J. (author), Roshchupkin, Gennady V. (author), Adams, Hieab H. (author), Schmidt, Helena (author), Hofer, Edith (author), Saba, Yasaman (author), Schmidt, Reinhold (author), Hofman, Albert (author), Amin, Najaf (author), van Duijn, Cornelia M. (author), Vernooij, Meike W. (author), Ikram, M. Arfan (author), Niessen, W.J. (author)
Background: The combination of genetics and imaging has improved their understanding of the brain through studies of aggregate measures obtained from high-resolution structural imaging. Voxel-wise analyses have the potential to provide more detailed information of genetic influences on the brain. Here they report a large-scale study of the...
journal article 2017
document
Sudeep, P. V. (author), Palanisamy, P. (author), Kesavadas, Chandrasekharan (author), Sijbers, JJM (author), den Dekker, A.J. (author), Rajan, Jeny (author)
A phase map can be obtained from the real and imaginary components of a complex valued magnetic resonance (MR) image. Many applications, such as MR phase velocity mapping and susceptibility mapping, make use of the information contained in the MR phase maps. Unfortunately, noise in the complex MR signal affects the measurement of parameters...
journal article 2017
Searched for: subject:"Magnetic%5C+resonance%5C+imaging"
(1 - 20 of 36)

Pages