Explanipedia

Development and demonstration of end‐to‐end testing for intra‐fraction motion‐managed workflows Open

Stijn Oolbekkink, J. Wolthaus, Bram van Asselen, Peter R. S. Stijnman, Bas W. Raaymakers · 2025

Background Intra‐fraction motion management techniques, including beam gating and intra‐fraction drift correction (IDC), have recently been introduced on the Unity MR‐linac (Elekta AB, Stockholm, Sweden) to mitigate the dosimetric impact o…

Automated dose evaluation on daily cone-beam computed tomography for breast cancer patients Open

M. Groot Koerkamp, Peter R. S. Stijnman, Antonetta C. Houweling, Cornel Zachiu, A.N.T.J. Kotte , et al. · 2024

We developed a fully automated workflow for dose evaluation on daily CBCT for local and locoregional breast radiotherapy. We have demonstrated its potential for aiding decision-making for plan adaptation in patients with changing anatomy a…

Unrolled Optimization via Physics-Assisted Convolutional Neural Network for MR-Based Electrical Properties Tomography: A Numerical Investigation Open

Sabrina Zumbo, Stefano Mandija, Ettore Flavio Meliadò, Peter R. S. Stijnman, Thierry Meerbothe , et al. · 2024

Magnetic Resonance imaging based Electrical Properties Tomography (MR-EPT) is a non-invasive technique that measures the electrical properties (EPs) of biological tissues. In this work, we present and numerically investigate the performanc…

Detectability and intra-fraction motion of individual elective lymph nodes in head and neck cancer patients on the Magnetic Resonance Image guided linear accelerator Open

Floris C.J. Reinders, Mischa de Ridder, Peter R. S. Stijnman, Patricia Doornaert, Cornelis P.J. Raaijmakers , et al. · 2024

Nearly all elective lymph nodes were detectable on the 1.5T MR-linac scan with no major changes in target volumes compared to the pre-treatment MRI. Simulated intra-fraction motion during the MR-linac scans was smaller than the 5-mm margin…

A database for <span>MR</span>‐based electrical properties tomography with in silico brain data—<span>ADEPT</span> Open

Thierry Meerbothe, Ettore Flavio Meliadò, Peter R. S. Stijnman, Cornelis A. T. van den Berg, Stefano Mandija · 2023

Purpose Several reconstruction methods for MR‐based electrical properties tomography (EPT) have been developed. However, the lack of common data makes it difficult to objectively compare their performances. This is, however, a necessary pr…

MRI visibility and displacement of elective lymph nodes during radiotherapy in head and neck cancer patients Open

Floris C.J. Reinders, Peter R. S. Stijnman, Mischa de Ridder, Patricia Doornaert, Cornelis P.J. Raaijmakers , et al. · 2022

Background and purpose To decrease the impact of radiotherapy to healthy tissues in the head and neck region, we propose to restrict the elective neck irradiation to elective lymph nodes at risk of containing micro metastases instead of th…

A perturbation approach for ultrafast calculation of RF field enhancements near medical implants in MRI Open

Peter R. S. Stijnman, Bart R. Steensma, Cornelis A. T. van den Berg, Alexander Raaijmakers · 2022

Patients with medical implants often are deprived of magnetic resonance imaging examination because of safety risks. One specific risk is the enhancement of the radiofrequency fields around the medical implant potentially resulting in sign…

A single setup approach for the MRI‐based measurement and validation of the transfer function of elongated medical implants Open

Peter R. S. Stijnman, M. Arcan Ertürk, Cornelis A. T. van den Berg, Alexander Raaijmakers · 2021

Purpose To propose a single setup using the MRI to both measure and validate the transfer function (TF) of linear implants. Conventionally, the TF of an implant is measured in one bench setup and validated using another. Methods It has bee…

Transceive phase corrected 2D contrast source inversion‐electrical properties tomography Open

Peter R. S. Stijnman, Stefano Mandija, Patrick Fuchs, Cornelis A. T. van den Berg, Rob Remis · 2020

Purpose To remove the necessity of the tranceive phase assumption for CSI‐EPT and show electrical properties maps reconstructed from measured data obtained using a standard 3T birdcage body coil setup. Methods The existing CSI‐EPT algorith…

Issue Information Open

Sebastian Martin, Andreas Endt, Tristan Wetscherek, A. K. Kuder, Michael Uder , et al. · 2020

Rest of World), €3741 (Europe), £2958 (UK

Accelerating implant RF safety assessment using a low‐rank inverse update method Open

Peter R. S. Stijnman, Janot P. Tokaya, Jeroen van Gemert, Peter R. Luijten, Josien P. W. Pluim , et al. · 2019

Purpose Patients who have medical metallic implants, e.g. orthopaedic implants and pacemakers, often cannot undergo an MRI exam. One of the largest risks is tissue heating due to the radio frequency (RF) fields. The RF safety assessment of…

Transceive Phase Corrected Contrast Source Inversion-Electrical Properties Tomography Open

Peter R. S. Stijnman, Stefano Mandija, Patrick Fuchs, Cornelis A. T. van den Berg, Rob Remis · 2019

Magnetic resonance imaging (MRI) based electrical properties tomography (EPT) is the quantification of the conductivity and permittivity of different tissues. These electrical properties can be obtained through different reconstruction met…

Transceive Phase Corrected Contrast Source Inversion-Electrical\n Properties Tomography Open

Peter R. S. Stijnman, Stefano Mandija, Patrick Fuchs, Cornelis A. T. van den Berg, Rob Remis · 2019

Magnetic resonance imaging (MRI) based electrical properties tomography (EPT)\nis the quantification of the conductivity and permittivity of different\ntissues. These electrical properties can be obtained through different\nreconstruction …

First-Order Induced Current Density Imaging and Electrical Properties Tomography in MRI Open

Patrick Fuchs, Stefano Mandija, Peter R. S. Stijnman, Wyger Brink, Cornelis A. T. van den Berg , et al. · 2018

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…

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