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Your search keyword '"Tijssen, Rob H.N."' showing total 22 results
Start Over Author "Tijssen, Rob H.N." Publication Type Academic Journals
22 results on '"Tijssen, Rob H.N."'

3. Patterns of Care, Tolerability, and Safety of the First Cohort of Patients Treated on a Novel High-Field MR-Linac Within the MOMENTUM Study: Initial Results From a Prospective Multi-Institutional Registry

Author

de Mol van Otterloo, Sophie R., Christodouleas, John P., Blezer, Erwin L.A., Akhiat, Hafid, Brown, Kevin, Choudhury, Ananya, Eggert, Dave, Erickson, Beth A., Daamen, Lois A., Faivre-Finn, Corinne, Fuller, Clifton D., Goldwein, Joel, Hafeez, Shaista, Hall, Emma, Harrington, Kevin J., van der Heide, Uulke A., Huddart, Robert A., Intven, Martijn P.W., Kirby, Anna M., Lalondrelle, Susan, McCann, Claire, Minsky, Bruce D., Mook, Stella, Nowee, Marlies E., Oelfke, Uwe, Orrling, Kristina, Philippens, Marielle E.P., Sahgal, Arjun, Schultz, Christopher J., Tersteeg, Robbert J.H.A., Tijssen, Rob H.N., Tree, Alison C., van Triest, Baukelien, Tseng, Chia-Lin, Hall, William A., and Verkooijen, Helena M.

Published
2021
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4. Adaptive radiotherapy: The Elekta Unity MR-linac concept

Author

Winkel, Dennis, Bol, Gijsbert H., Kroon, Petra S., van Asselen, Bram, Hackett, Sara S., Werensteijn-Honingh, Anita M., Intven, Martijn P.W., Eppinga, Wietse S.C., Tijssen, Rob H.N., Kerkmeijer, Linda G.W., de Boer, Hans C.J., Mook, Stella, Meijer, Gert J., Hes, Jochem, Willemsen-Bosman, Mirjam, de Groot-van Breugel, Eline N., Jürgenliemk-Schulz, Ina M., and Raaymakers, Bas W.

Published
2019
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18. Feasibility of stereotactic radiotherapy using a 1.5 T MR-linac: Multi-fraction treatment of pelvic lymph node oligometastases

Author

Werensteijn-Honingh, Anita M., Kroon, Petra S., Winkel, Dennis, Aalbers, Ellart M., van Asselen, Bram, Bol, Gijsbert H., Brown, Kevin J., Eppinga, Wietse S.C., van Es, Corine A., Glitzner, Markus, de Groot-van Breugel, Eline N., Hackett, Sara L., Intven, Martijn, Kok, Jan G.M., Kontaxis, Charis, Kotte, Alexis N., Lagendijk, Jan J.W., Philippens, Mariëlle E.P., Tijssen, Rob H.N., Wolthaus, Jochem W.H., Woodings, Simon J., Raaymakers, Bas W., and Jürgenliemk-Schulz, Ina M.

Published
2019
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20. Adaptive bulk motion exclusion for improved robustness of abdominal magnetic resonance imaging.

Author

Stemkens, Bjorn, Benkert, Thomas, Chandarana, Hersh, Bittman, Mark E., Van den Berg, Cornelis A.T., Lagendijk, Jan J.W., Sodickson, Daniel K., Tijssen, Rob H.N., and Block, Kai Tobias

Abstract

Non-Cartesian magnetic resonance imaging (MRI) sequences have shown great promise for abdominal examination during free breathing, but break down in the presence of bulk patient motion (i.e. voluntary or involuntary patient movement resulting in translation, rotation or elastic deformations of the body). This work describes a data-consistency-driven image stabilization technique that detects and excludes bulk movements during data acquisition. Bulk motion is identified from changes in the signal intensity distribution across different elements of a multi-channel receive coil array. A short free induction decay signal is acquired after excitation and used as a measure to determine alterations in the load distribution. The technique has been implemented on a clinical MR scanner and evaluated in the abdomen. Six volunteers were scanned and two radiologists scored the reconstructions. To show the applicability to other body areas, additional neck and knee images were acquired. Data corrupted by bulk motion were successfully detected and excluded from image reconstruction. An overall increase in image sharpness and reduction of streaking and shine-through artifacts were seen in the volunteer study, as well as in the neck and knee scans. The proposed technique enables automatic real-time detection and exclusion of bulk motion during MR examinations without user interaction. It may help to improve the reliability of pediatric MRI examinations without the use of sedation. [ABSTRACT FROM AUTHOR]

Published
2017
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22. ADC measurements on the Unity MR-linac – A recommendation on behalf of the Elekta Unity MR-linac consortium.

Author

Kooreman, Ernst S., van Houdt, Petra J., Keesman, Rick, Pos, Floris J., van Pelt, Vivian W.J., Nowee, Marlies E., Wetscherek, Andreas, Tijssen, Rob H.N., Philippens, Marielle E.P., Thorwarth, Daniela, Wang, Jihong, Shukla-Dave, Amita, Hall, William A., Paulson, Eric S., and van der Heide, Uulke A.

Subjects
*CYCLOTRONS, *DIFFUSION magnetic resonance imaging, *PROSTATE cancer patients, *SPATIAL variation
Abstract

• Machine characteristics must be considered when selecting b -values for measuring the ADC. • Spatial variation of the ADC requires positioning of a ROI near the iso-center. • The ADC can be measured on the Unity system during gantry rotation and irradiation. • Includes example acquisition parameters to facilitate multi-center research. Diffusion-weighted imaging (DWI) for treatment response monitoring is feasible on hybrid magnetic resonance linear accelerator (MR-linac) systems. The MRI scanner of the Elekta Unity system has an adjusted design compared to diagnostic scanners. We investigated its impact on measuring the DWI-derived apparent diffusion coefficient (ADC) regarding three aspects: the choice of b -values, the spatial variation of the ADC, and scanning during radiation treatment. The aim of this study is to give recommendations for accurate ADC measurements on Unity systems. Signal-to-noise ratio (SNR) measurements with increasing b -values were done to determine the highest bvalue that can be measured reliably. The spatial variation of the ADC was assessed on six Unity systems with a cylindrical phantom of 40 cm diameter. The influence of gantry rotation and irradiation was investigated by acquiring DWI images before and during treatment of 11 prostate cancer patients. On the Unity system, a maximum b -value of 500 s/mm2 should be used for ADC quantification, as a trade-off between SNR and diffusion weighting. Accurate ADC values were obtained within 7 cm from the iso-center, while outside this region ADC values deviated more than 5%. The ADC was not influenced by the rotating linac or irradiation during treatment. We provide Unity system specific recommendations for measuring the ADC. This will increase the consistency of ADC values acquired in different centers on the Unity system, enabling large cohort studies for biomarker discovery and treatment response monitoring. [ABSTRACT FROM AUTHOR]

Published
2020
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