Search Results - "Lagendijk, J."

A new methodology for inter- and intrafraction plan adaptation for the MR-linac by Kontaxis, Charis, Bol, G H, Lagendijk, J J W, Raaymakers, B W

“…The new era of hybrid MRI and linear accelerator machines, including the MR-linac currently being installed in the University Medical Center Utrecht (Utrecht,…”
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Towards fast online intrafraction replanning for free-breathing stereotactic body radiation therapy with the MR-linac by Kontaxis, C, Bol, G H, Stemkens, B, Glitzner, M, Prins, F M, Kerkmeijer, L G W, Lagendijk, J J W, Raaymakers, B W

“…The hybrid MRI-radiotherapy machines, like the MR-linac (Elekta AB, Stockholm, Sweden) installed at the UMC Utrecht (Utrecht, The Netherlands), will be able to…”
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Proof of concept of MRI-guided tracked radiation delivery: tracking one-dimensional motion by Crijns, S P M, Raaymakers, B W, Lagendijk, J J W

“…In radiotherapy one aims to deliver a radiation dose to a tumour with high geometrical accuracy while sparing organs at risk (OARs). Although image guidance…”
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The development of the MRI linac system for online MRI‐guided radiotherapy: a clinical update by Lagendijk, J. J. W., Vulpen, M., Raaymakers, B. W.

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Consequences of air around an ionization chamber: Are existing solid phantoms suitable for reference dosimetry on an MR-linac? by Hackett, S. L., van Asselen, B., Wolthaus, J. W. H., Kok, J. G. M., Woodings, S. J., Lagendijk, J. J. W., Raaymakers, B. W.

“…Purpose: A protocol for reference dosimetry for the MR-linac is under development. The 1.5 T magnetic field changes the mean path length of electrons in an…”
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Proof-of-concept delivery of intensity modulated arc therapy on the Elekta Unity 1.5 T MR-linac by Kontaxis, C, Woodhead, P L, Bol, G H, Lagendijk, J J W, Raaymakers, B W

“…In this work we present the first delivery of intensity modulated arc therapy on the Elekta Unity 1.5 T MR-linac. The machine's current intensity modulated…”
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Prostate intrafraction motion during the preparation and delivery of MR-guided radiotherapy sessions on a 1.5T MR-Linac by de Muinck Keizer, D.M., Kerkmeijer, L.G.W., Willigenburg, T., van Lier, A.L.H.M.W., Hartogh, M.D. den, van der Voort van Zyp, J.R.N., de Groot-van Breugel, E.N., Raaymakers, B.W., Lagendijk, J.J.W., de Boer, J.C.J.

“…To evaluate prostate intrafraction motion using MRI during the full course of online adaptive MR-Linac radiotherapy (RT) fractions, in preparation of MR-guided…”
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Design of a radiative surface coil array element at 7 T: The single-side adapted dipole antenna by Raaijmakers, A. J. E., Ipek, O., Klomp, D. W. J., Possanzini, C., Harvey, P. R., Lagendijk, J. J. W., van den Berg, C. A. T.

“…Ultra high field MR imaging (≥7 T) of deeply located targets in the body is facing some radiofrequency‐field related challenges: interference patterns, reduced…”
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Magnetic-field-induced dose effects in MR-guided radiotherapy systems: dependence on the magnetic field strength by Raaijmakers, A J E, Raaymakers, B W, Lagendijk, J J W

“…Several institutes are currently working on the development of a radiotherapy treatment system with online MR imaging (MRI) modality. The main difference…”
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Integrating a 1.5 T MRI scanner with a 6 MV accelerator: proof of concept by Raaymakers, B W, Lagendijk, J J W, Overweg, J, Kok, J G M, Raaijmakers, A J E, Kerkhof, E M, van der Put, R W, Meijsing, I, Crijns, S P M, Benedosso, F, van Vulpen, M, de Graaff, C H W, Allen, J, Brown, K J

“…At the UMC Utrecht, The Netherlands, we have constructed a prototype MRI accelerator. The prototype is a modified 6 MV Elekta (Crawley, UK) accelerator next to…”
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First patients treated with a 1.5 T MRI-Linac: clinical proof of concept of a high-precision, high-field MRI guided radiotherapy treatment by Raaymakers, B W, Jürgenliemk-Schulz, I M, Bol, G H, Glitzner, M, Kotte, A N T J, van Asselen, B, de Boer, J C J, Bluemink, J J, Hackett, S L, Moerland, M A, Woodings, S J, Wolthaus, J W H, van Zijp, H M, Philippens, M E P, Tijssen, R, Kok, J G M, de Groot-van Breugel, E N, Kiekebosch, I, Meijers, L T C, Nomden, C N, Sikkes, G G, Doornaert, P A H, Eppinga, W S C, Kasperts, N, Kerkmeijer, L G W, Tersteeg, J H A, Brown, K J, Pais, B, Woodhead, P, Lagendijk, J J W

“…The integration of 1.5 T MRI functionality with a radiotherapy linear accelerator (linac) has been pursued since 1999 by the UMC Utrecht in close collaboration…”
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Towards adaptive IMRT sequencing for the MR-linac by Kontaxis, Charis, Bol, G H, Lagendijk, J J W, Raaymakers, B W

“…The MRI linear accelerator (MR-linac) that is currently being installed in the University Medical Center Utrecht (Utrecht, The Netherlands), will be able to…”
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Compensating for the impact of non-stationary spherical air cavities on IMRT dose delivery in transverse magnetic fields by Bol, G H, Lagendijk, J J W, Raaymakers, B W

“…With the development of the 1.5 T MRI linear accelerator and the clinical introduction of the 0.35 T ViewRay™ system, delivering intensity-modulated…”
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Towards reference dosimetry for the MR-linac: magnetic field correction of the ionization chamber reading by Smit, K, van Asselen, B, Kok, J G M, Aalbers, A H L, Lagendijk, J J W, Raaymakers, B W

“…In the UMC Utrecht a prototype MR-linac has been installed. The system consists of a 6 MV Elekta (Crawley, UK) linear accelerator and a 1.5 T Philips (Best,…”
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Technical feasibility of magnetic resonance fingerprinting on a 1.5T MRI-linac by Bruijnen, T, van der Heide, O, Intven, M P W, Mook, S, Lagendijk, J J W, van den Berg, C A T, Tijssen, R H N

“…Hybrid MRI-linac (MRL) systems enable daily multiparametric quantitative MRI to assess tumor response to radiotherapy. Magnetic resonance fingerprinting (MRF)…”
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Dosimetry for the MRI accelerator: the impact of a magnetic field on the response of a Farmer NE2571 ionization chamber by Meijsing, I, Raaymakers, B W, Raaijmakers, A J E, Kok, J G M, Hogeweg, L, Liu, B, Lagendijk, J J W

“…The UMC Utrecht is constructing a 1.5 T MRI scanner integrated with a linear accelerator (Lagendijk et al 2008 Radiother. Oncol. 86 25-9). The goal of this…”
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Virtual couch shift (VCS): accounting for patient translation and rotation by online IMRT re-optimization by Bol, G H, Lagendijk, J J W, Raaymakers, B W

“…When delivering conventional intensity modulated radiotherapy (IMRT), discrepancies between the pre-treatment CT/MRI/PET based patient geometry and the daily…”
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Fast online Monte Carlo-based IMRT planning for the MRI linear accelerator by Bol, G H, Hissoiny, S, Lagendijk, J J W, Raaymakers, B W

“…The MRI accelerator, a combination of a 6 MV linear accelerator with a 1.5 T MRI, facilitates continuous patient anatomy updates regarding translations,…”
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Feasibility of MRI guided proton therapy: magnetic field dose effects by Raaymakers, B W, Raaijmakers, A J E, Lagendijk, J J W

“…Many methods exist to improve treatment outcome in radiotherapy. Two of these are image-guided radiotherapy (IGRT) and proton therapy. IGRT aims at a more…”
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Soft-tissue prostate intrafraction motion tracking in 3D cine-MR for MR-guided radiotherapy by de Muinck Keizer, D M, Kerkmeijer, L G W, Maspero, M, Andreychenko, A, van der Voort van Zyp, J R N, van den Berg, C A T, Raaymakers, B W, Lagendijk, J J W, de Boer, J C J

“…To develop a method to automatically determine intrafraction motion of the prostate based on soft tissue contrast on 3D cine-magnetic resonance (MR) images…”
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