Search

Your search keyword '"Kooreman, Ernst S."' showing total 16 results
Start Over Author "Kooreman, Ernst S."
16 results on '"Kooreman, Ernst S."'

1. Integration of quantitative imaging biomarkers in clinical trials for MR-guided radiotherapy: Conceptual guidance for multicentre studies from the MR-Linac Consortium Imaging Biomarker Working Group

Author

van Houdt, Petra J., Saeed, Hina, Thorwarth, Daniela, Fuller, Clifton D., Hall, William A., McDonald, Brigid A., Shukla-Dave, Amita, Kooreman, Ernst S., Philippens, Marielle E.P., van Lier, Astrid L.H.M.W., Keesman, Rick, Mahmood, Faisal, Coolens, Catherine, Stanescu, Teodor, Wang, Jihong, Tyagi, Neelam, Wetscherek, Andreas, and van der Heide, Uulke A.

Published
2021
Full Text
View/download PDF

7. Daily Intravoxel Incoherent Motion (IVIM) In Prostate Cancer Patients During MR-Guided Radiotherapy—A Multicenter Study

Author

Kooreman, Ernst S., primary, van Houdt, Petra J., additional, Keesman, Rick, additional, van Pelt, Vivian W. J., additional, Nowee, Marlies E., additional, Pos, Floris, additional, Sikorska, Karolina, additional, Wetscherek, Andreas, additional, Müller, Arndt-Christian, additional, Thorwarth, Daniela, additional, Tree, Alison C., additional, and van der Heide, Uulke A., additional

Published
2021
Full Text
View/download PDF

8. Double delay alternating with nutation for tailored excitation facilitates banding‐free isotropic high‐resolution intracranial vessel wall imaging

Author

Coolen, Bram F., primary, Schoormans, Jasper, additional, Gilbert, Guillaume, additional, Kooreman, Ernst S., additional, Winter, Naomi, additional, Viessmann, Olivia, additional, Zwanenburg, Jaco J. M., additional, Majoie, Charles B. L. M., additional, Strijkers, Gustav J., additional, Nederveen, Aart J., additional, and Siero, Jeroen C. W., additional

Published
2021
Full Text
View/download PDF

9. Double delay alternating with nutation for tailored excitation facilitates banding-free isotropic high-resolution intracranial vessel wall imaging

Author

Coolen, Bram F, Schoormans, Jasper, Gilbert, Guillaume, Kooreman, Ernst S, de Winter, Naomi, Viessmann, Olivia, Zwanenburg, Jaco J M, Majoie, Charles B L M, Strijkers, Gustav J, Nederveen, Aart J, Siero, Jeroen C W, Coolen, Bram F, Schoormans, Jasper, Gilbert, Guillaume, Kooreman, Ernst S, de Winter, Naomi, Viessmann, Olivia, Zwanenburg, Jaco J M, Majoie, Charles B L M, Strijkers, Gustav J, Nederveen, Aart J, and Siero, Jeroen C W

Abstract

The purpose of this study was to evaluate the use of a double delay alternating with nutation for tailored excitation (D-DANTE)-prepared sequence for banding-free isotropic high-resolution intracranial vessel wall imaging (IC-VWI) and to compare its performance with regular DANTE in terms of signal-to-noise ratio (SNR) as well as cerebrospinal fluid (CSF) and blood suppression efficiency. To this end, a D-DANTE-prepared 3D turbo spin echo sequence was implemented by interleaving two separate DANTE pulse trains with different RF phase-cycling schemes, but keeping all other DANTE parameters unchanged, including the total number of pulses and total preparation time. This achieved a reduction of the banding distance compared with regular DANTE enabling banding-free imaging up to higher resolutions. Bloch simulations assuming static vessel wall and flowing CSF spins were performed to compare DANTE and D-DANTE in terms of SNR and vessel wall/CSF contrast. Similar image quality measures were assessed from measurements on 13 healthy middle-aged volunteers. Both simulation and in vivo results showed that D-DANTE had only slightly lower vessel wall/CSF and vessel wall/blood contrast-to-noise ratio values compared with regular DANTE, which originated from a 10%-15% reduction in vessel wall SNR but not from reduced CSF or blood suppression efficiency. As anticipated, IC-VWI acquisitions showed that D-DANTE can successfully remove banding artifacts compared with regular DANTE with equal scan time or DANTE preparation length. Moreover, application was demonstrated in a patient with an intracranial aneurysm, indicating improved robustness to slow flow artifacts compared with clinically available 3D turbo spin echo scans. In conclusion, D-DANTE provides banding artifact-free IC-VWI up to higher isotropic resolutions compared with regular DANTE. This allows for a more flexible choice of DANTE preparation parameters in high-resolution IC-VWI protocols.

Published
2021

10. Double delay alternating with nutation for tailored excitation facilitates banding-free isotropic high-resolution intracranial vessel wall imaging

Author

Highfield Research Group, Circulatory Health, Regenerative Medicine and Stem Cells, Cancer, Brain, Coolen, Bram F, Schoormans, Jasper, Gilbert, Guillaume, Kooreman, Ernst S, de Winter, Naomi, Viessmann, Olivia, Zwanenburg, Jaco J M, Majoie, Charles B.L.M., Strijkers, Gustav J, Nederveen, Aart J, Siero, Jeroen C W, Highfield Research Group, Circulatory Health, Regenerative Medicine and Stem Cells, Cancer, Brain, Coolen, Bram F, Schoormans, Jasper, Gilbert, Guillaume, Kooreman, Ernst S, de Winter, Naomi, Viessmann, Olivia, Zwanenburg, Jaco J M, Majoie, Charles B.L.M., Strijkers, Gustav J, Nederveen, Aart J, and Siero, Jeroen C W

Published
2021

11. Integration of quantitative imaging biomarkers in clinical trials for MR-guided radiotherapy: Conceptual guidance for multicentre studies from the MR-Linac Consortium Imaging Biomarker Working Group

Author

Klinische Fysica RT, Cancer, van Houdt, Petra J., Saeed, Hina, Thorwarth, Daniela, Fuller, Clifton D., Hall, William A., McDonald, Brigid A., Shukla-Dave, Amita, Kooreman, Ernst S., Philippens, Marielle E.P., van Lier, Astrid L.H.M.W., Keesman, Rick, Mahmood, Faisal, Coolens, Catherine, Stanescu, Teodor, Wang, Jihong, Tyagi, Neelam, Wetscherek, Andreas, van der Heide, Uulke A., Klinische Fysica RT, Cancer, van Houdt, Petra J., Saeed, Hina, Thorwarth, Daniela, Fuller, Clifton D., Hall, William A., McDonald, Brigid A., Shukla-Dave, Amita, Kooreman, Ernst S., Philippens, Marielle E.P., van Lier, Astrid L.H.M.W., Keesman, Rick, Mahmood, Faisal, Coolens, Catherine, Stanescu, Teodor, Wang, Jihong, Tyagi, Neelam, Wetscherek, Andreas, and van der Heide, Uulke A.

Published
2021

12. T 1ρ for Radiotherapy Treatment Response Monitoring in Rectal Cancer Patients: A Pilot Study.

Author

Kooreman, Ernst S., Tanaka, Max, ter Beek, Leon C., Peters, Femke P., Marijnen, Corrie A. M., van der Heide, Uulke A., and van Houdt, Petra J.

Subjects
*RECTAL cancer, *CANCER patients, *PILOT projects, *LINEAR accelerators, *RADIOTHERAPY
Abstract

Quantitative MRI has the potential to produce imaging biomarkers for the prediction of early response to radiotherapy treatment. In this pilot study, a potential imaging biomarker, the T1ρ relaxation time, is assessed for this purpose. A T1ρ sequence was implemented on a 1.5 T MR-linac system, a system that combines an MRI with a linear accelerator for radiation treatment. An agar phantom with concentrations of 1–4% w/w was constructed for technical validation of the sequence. Phantom images were assessed in terms of short-term repeatability and signal-to-noise ratio. Twelve rectal cancer patients, who were treated with 5 × 5 Gy, were imaged on each treatment fraction. Individual changes in the T1ρ values of the gross tumor volume (GTV) showed an increase for most patients, although a paired t-test comparing values in the GTV from the first to the last treatment fraction showed no statistically significant difference. The phantom measurements showed excellent short-term repeatability (0.5–1.5 ms), and phantom T1ρ values corresponded to the literature values. T1ρ imaging was implemented successfully on the MR-linac, with a repeatability comparable to diagnostic systems, although clinical benefit in terms of treatment response monitoring remains to be demonstrated. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

13. ADC measurements on the Unity MR-linac - A recommendation on behalf of the Elekta Unity MR-linac consortium

Author

Klinische Fysica RT, Cancer, 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, van der Heide, Uulke A, Klinische Fysica RT, Cancer, 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

Published
2020

14. Feasibility and accuracy of quantitative imaging on a 1.5 T MR-linear accelerator

Author

Kooreman, Ernst S, van Houdt, Petra J, Nowee, Marlies E, van Pelt, Vivian W J, Tijssen, Rob H N, Paulson, Eric S, Gurney-Champion, Oliver J, Wang, Jihong, Koetsveld, Folkert, van Buuren, Laurens D, Ter Beek, Leon C, van der Heide, Uulke A, Kooreman, Ernst S, van Houdt, Petra J, Nowee, Marlies E, van Pelt, Vivian W J, Tijssen, Rob H N, Paulson, Eric S, Gurney-Champion, Oliver J, Wang, Jihong, Koetsveld, Folkert, van Buuren, Laurens D, Ter Beek, Leon C, and van der Heide, Uulke A

Published
2019

15. Feasibility and accuracy of quantitative imaging on a 1.5 T MR-linear accelerator

Author

Klinische Fysica RT, Cancer, Kooreman, Ernst S, van Houdt, Petra J, Nowee, Marlies E, van Pelt, Vivian W J, Tijssen, Rob H N, Paulson, Eric S, Gurney-Champion, Oliver J, Wang, Jihong, Koetsveld, Folkert, van Buuren, Laurens D, Ter Beek, Leon C, van der Heide, Uulke A, Klinische Fysica RT, Cancer, Kooreman, Ernst S, van Houdt, Petra J, Nowee, Marlies E, van Pelt, Vivian W J, Tijssen, Rob H N, Paulson, Eric S, Gurney-Champion, Oliver J, Wang, Jihong, Koetsveld, Folkert, van Buuren, Laurens D, Ter Beek, Leon C, and van der Heide, Uulke A

Published
2019

Catalog

Books, media, physical & digital resources
See catalog results