Publications by authors named "Christal van de Steeg-Henzen"
Purpose: To optimize Relaxation along a Fictitious Field (RAFF) pulses for rotating frame relaxometry with improved robustness in the presence of and field inhomogeneities.
Methods: The resilience of RAFF pulses against and inhomogeneities was studied using Bloch simulations. A parameterized extension of the RAFF formulation was introduced and used to derive a generalized inhomogeneity-resilient RAFF (girRAFF) pulse.
Purpose: To develop and evaluate a robust cardiac mapping sequence at 3 T, using Bloch-Siegert shift (BSS)-based preparations.
Methods: A longitudinal magnetization preparation module was designed to encode . After magnetization tip-down, off-resonant Fermi pulses, placed symmetrically around two refocusing pulses, induced BSS, followed by tipping back of the magnetization.
Background & Purpose: Magnetic resonance imaging (MRI) is increasingly used in treatment preparation of ocular proton therapy, but its spatial accuracy might be limited by geometric distortions due to susceptibility artefacts. A correct geometry of the MR images is paramount since it defines where the dose will be delivered. In this study, we assessed the geometrical accuracy of ocular MRI.
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- - The study aims to enhance an adiabatic method for accurately measuring spin-lock relaxation in the heart using advanced MRI techniques at 3 Tesla (3T).
- - Researchers optimized various adiabatic spin-lock (aSL) modules for better performance against magnetic field inhomogeneities and validated them through simulations and tests on phantoms and healthy subjects.
- - Results indicated that the optimized aSL methods provided significantly improved image quality, precision, and reproducibility in relaxation time measurements compared to traditional methods, with specific modules showing the best performance in both healthy individuals and patients with cardiovascular conditions.
Objective: Quantitative Magnetic Resonance Imaging (MRI) holds great promise for the early detection of cartilage deterioration. Here, a Magnetic Resonance Fingerprinting (MRF) framework is proposed for comprehensive and rapid quantification of T, T, and T with whole-knee coverage.
Methods: A MRF framework was developed to achieve quantification of Relaxation Along a Fictitious Field in the 2nd rotating frame of reference ( T) along with T and T.
Adiabatic spin-lock preparations enable robust in vivo cardiac T-mapping at 3T.
Annu Int Conf IEEE Eng Med Biol Soc
July 2022
Magnetic Resonance Imaging (MRI) is the clinical gold standard for the assessment of myocardial viability but requires injection of exogenous gadolinium-based contrast agents. Recently, T-mapping has been proposed as a fully non-invasive alternative for imaging myocardial fibrosis without the need for contrast agent injection. However, its applicability at high fields is hindered by susceptibility to MRI system imperfections, such as inhomogeneities in the B and B fields.
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