Browsing ICR Divisions by author "Gurney-Champion, Oliver"
Now showing items 1-9 of 9
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A novel amplitude binning strategy to handle irregular breathing during 4DMRI acquisition: improved imaging for radiotherapy purposes.
van Kesteren, Z; van der Horst, A; Gurney-Champion, OJ; Bones, I; Tekelenburg, D; et al. (BMC, 2019-05-14)BACKGROUND: For radiotherapy of abdominal cancer, four-dimensional magnetic resonance imaging (4DMRI) is desirable for tumor definition and the assessment of tumor and organ motion. However, irregular breathing gives rise ... -
Comparison of six fit algorithms for the intra-voxel incoherent motion model of diffusion-weighted magnetic resonance imaging data of pancreatic cancer patients.
Gurney-Champion, OJ; Klaassen, R; Froeling, M; Barbieri, S; Stoker, J; et al. (PUBLIC LIBRARY SCIENCE, 2018-04-04)The intravoxel incoherent motion (IVIM) model for diffusion-weighted imaging (DWI) MRI data bears much promise as a tool for visualizing tumours and monitoring treatment response. To improve the currently poor precision ... -
Deep learning how to fit an intravoxel incoherent motion model to diffusion-weighted MRI.
Barbieri, S; Gurney-Champion, OJ; Klaassen, R; Thoeny, HC (WILEY, 2020-01-01)PURPOSE: This prospective clinical study assesses the feasibility of training a deep neural network (DNN) for intravoxel incoherent motion (IVIM) model fitting to diffusion-weighted MRI (DW-MRI) data and evaluates its ... -
Large expert-curated database for benchmarking document similarity detection in biomedical literature search.
Brown, P; RELISH Consortium,; Zhou, Y (OXFORD UNIV PRESS, 2019-01-01)Document recommendation systems for locating relevant literature have mostly relied on methods developed a decade ago. This is largely due to the lack of a large offline gold-standard benchmark of relevant documents that ... -
MRI-based Assessment of 3D Intrafractional Motion of Head and Neck Cancer for Radiation Therapy.
Gurney-Champion, OJ; McQuaid, D; Dunlop, A; Wong, KH; Welsh, LC; et al. (ELSEVIER SCIENCE INC, 2018-02-01)PURPOSE: To determine the 3-dimensional (3D) intrafractional motion of head and neck squamous cell carcinoma (HNSCC). METHODS AND MATERIALS: Dynamic contrast-enhanced magnetic resonance images from 56 patients with HNSCC ... -
Optimal acquisition scheme for flow-compensated intravoxel incoherent motion diffusion-weighted imaging in the abdomen: An accurate and precise clinically feasible protocol.
Gurney-Champion, OJ; Rauh, SS; Harrington, K; Oelfke, U; Laun, FB; et al. (WILEY, 2020-03-01)PURPOSE: Flow-compensated (FC) diffusion-weighted MRI (DWI) for intravoxel-incoherent motion (IVIM) modeling allows for a more detailed description of tissue microvasculature than conventional IVIM. The long acquisition ... -
Principal component analysis fosr fast and model-free denoising of multi b-value diffusion-weighted MR images.
Gurney-Champion, OJ; Collins, DJ; Wetscherek, A; Rata, M; Klaassen, R; et al. (IOP PUBLISHING LTD, 2019-04-09)Despite the utility of tumour characterisation using quantitative parameter maps from multi-b-value diffusion-weighted MRI (DWI), clinicians often prefer the use of the image with highest diffusion-weighting (b-value), for ... -
Reduced inter-observer and intra-observer delineation variation in esophageal cancer radiotherapy by use of fiducial markers.
Machiels, M; Jin, P; van Hooft, JE; Gurney-Champion, OJ; Jelvehgaran, P; et al. (TAYLOR & FRANCIS LTD, 2019-06-03)Objective: Delineation variation of esophageal tumors remains a large source of geometric uncertainty. In the present study, we investigated the inter- and intra-observer variation in esophageal gross tumor volume (GTV) ... -
Super-resolution T2-weighted 4D MRI for image guided radiotherapy.
Freedman, JN; Collins, DJ; Gurney-Champion, OJ; McClelland, JR; Nill, S; et al. (ELSEVIER IRELAND LTD, 2018-12-01)BACKGROUND AND PURPOSE: The superior soft-tissue contrast of 4D-T2w MRI motivates its use for delineation in radiotherapy treatment planning. We address current limitations of slice-selective implementations, including ...