Results 1 to 10 of about 278,785 (319)

HYPERBOLIC DISTORTION MODEL FOR RADIAL DISTORTION CORRECTION [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2019
When information derived from the imagery is used for metric purposes and not as communication tools the impact of small imaging errors can be significant on the accuracy of derived information.
G. B. Ikokou, J. Smit
doaj   +4 more sources

Rapid distortion correction enables accurate magnetic resonance imaging-guided real-time adaptive radiotherapy [PDF]

Physics and Imaging in Radiation Oncology, 2023
Background and purpose: Magnetic resonance imaging (MRI)-Linac systems combine simultaneous MRI with radiation delivery, allowing treatments to be guided by anatomically detailed, real-time images.
Paul Z. Y Liu, Shanshan Shan, David Waddington, Brendan Whelan, Bin Dong, Gary Liney, Paul Keall   +6 more
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Model-Independent Lens Distortion Correction Based on Sub-Pixel Phase Encoding [PDF]

Sensors, 2021
Lens distortion can introduce deviations in visual measurement and positioning. The distortion can be minimized by optimizing the lens and selecting high-quality optical glass, but it cannot be completely eliminated.
Pengbo Xiong, Shaokai Wang, Weibo Wang, Qixin Ye, Shujiao Ye   +4 more
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Using synthetic MR images for distortion correction [PDF]

Developmental Cognitive Neuroscience, 2023
Functional MRI (fMRI) data acquired using echo-planar imaging (EPI) are highly distorted by magnetic field inhomogeneities. Distortion and differences in image contrast between EPI and T1-weighted and T2-weighted (T1w/T2w) images makes their alignment a ...
David F. Montez, Andrew N. Van, Ryland L. Miller, Nicole A. Seider, Scott Marek, Annie Zheng, Dillan J. Newbold, Kristen Scheidter, Eric Feczko, Anders J. Perrone, Oscar Miranda-Dominguez, Eric A. Earl, Benjamin P. Kay, Abhinav K. Jha, Aristeidis Sotiras, Timothy O. Laumann, Deanna J. Greene, Evan M. Gordon, M. Dylan Tisdall, Andre van der Kouwe, Damien A. Fair, Nico U.F. Dosenbach   +21 more
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A Distortion Correction Method Based on Actual Camera Imaging Principles [PDF]

Sensors
In the human–robot collaboration system, the high-precision distortion correction of the camera as an important sensor is a crucial prerequisite for accomplishing the task.
Wenxin Yin, Xizhe Zang, Lei Wu, Xuehe Zhang, Jie Zhao   +4 more
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Model-Free Lens Distortion Correction Based on Phase Analysis of Fringe-Patterns [PDF]

Sensors, 2020
The existing lens correction methods deal with the distortion correction by one or more specific image distortion models. However, distortion determination may fail when an unsuitable model is used.
Jiawen Weng, Weishuai Zhou, Simin Ma, Pan Qi, Jingang Zhong   +4 more
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MRI distortion correction is associated with improved local control in stereotactic radiotherapy for brain metastases [PDF]

Scientific Reports
Distortions in brain MRI caused by gradient nonlinearities may reach several millimeters, thus distortion correction is strongly recommended for radiotherapy treatment planning.
Daniel Höfler, Johanna Grigo, Hadi Siavosch, Marc Saake, Manuel Alexander Schmidt, Thomas Weissmann, Philipp Schubert, Raphaela Voigt, Sebastian Lettmaier, Sabine Semrau, Arnd Dörfler, Michael Uder, Christoph Bert, Rainer Fietkau, Florian Putz   +14 more
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Distortion correction of diffusion weighted MRI without reverse phase-encoding scans or field-maps. [PDF]

PLoS ONE, 2020
Diffusion magnetic resonance images may suffer from geometric distortions due to susceptibility induced off resonance fields, which cause geometric mismatch with anatomical images and ultimately affect subsequent quantification of microstructural or ...
Kurt G Schilling, Justin Blaber, Colin Hansen, Leon Cai, Baxter Rogers, Adam W Anderson, Seth Smith, Praitayini Kanakaraj, Tonia Rex, Susan M Resnick, Andrea T Shafer, Laurie E Cutting, Neil Woodward, David Zald, Bennett A Landman   +14 more
doaj   +2 more sources

Virtual phantom methodology for assessment of MRI distortion correction in high-precision stereotactic radiosurgery treatment planning [PDF]

Frontiers in Oncology
IntroductionThe accuracy of stereotactic treatment planning is primarily limited by the least accurate process in the whole chain of events, and is particularly important in cranial radiosurgery. Ameliorating this process can improve treatment targeting,
Tristan Belloeil-Marrane, Adrian Gutierrez, Marlies Boussaer, Cristina Teixeira, Thierry Gevaert, Mark De Ridder   +5 more
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Comparison of distortion correction preprocessing pipelines for DTI in the upper limb. [PDF]

Magn Reson Med, 2023
Wade RG, Tam W, Perumal A, Pepple S, Griffiths TT, Flather R, Haroon HA, Shelley D, Plein S, Bourke G, Teh I.   +10 more
europepmc   +3 more sources