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   Articles with "motion" as a keyword



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Stochastic dynamics of intermittent pore-scale particle motion in three-dimensional porous media: Experiments and theory

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recommendations! Published in 2017 at "Geophysical Research Letters"

DOI: 10.1002/2017gl074326

Abstract: ©2017. American Geophysical Union. All Rights Reserved. We study the evolution of velocity in time, which fundamentally controls the way dissolved substances are transported and spread in porous media. Experiments are conducted that use tracer… read more here.

Keywords: motion; velocity; media experiments; particle ... See more keywords
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Organ motion in pediatric high‐risk neuroblastoma patients using four‐dimensional computed tomography

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recommendations! Published in 2017 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.12012

Abstract: Abstract Purpose/objective(s) High‐risk neuroblastoma (HR‐NBL) requires multimodality treatment, including external beam radiation of the primary tumor site following resection. Radiotherapy planning must take into account motion of the target and adjacent normal anatomy, both of… read more here.

Keywords: organ motion; motion; high risk; risk neuroblastoma ... See more keywords
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To frame or not to frame? Cone‐beam CT‐based analysis of head immobilization devices specific to linac‐based stereotactic radiosurgery and radiotherapy

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recommendations! Published in 2018 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.12251

Abstract: Abstract Purpose Noninvasive frameless systems are increasingly being utilized for head immobilization in stereotactic radiosurgery (SRS). Knowing the head positioning reproducibility of frameless systems and their respective ability to limit intrafractional head motion is important… read more here.

Keywords: head; motion; frame; head immobilization ... See more keywords
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Correlation between intrafractional motion and dosimetric changes for prostate IMRT: Comparison of different adaptive strategies

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recommendations! Published in 2018 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.12359

Abstract: Abstract Purpose To retrospectively analyze and estimate the dosimetric benefit of online and offline motion mitigation strategies for prostate IMRT. Methods Intrafractional motion data of 21 prostate patients receiving intensity‐modulated radiotherapy was acquired with an… read more here.

Keywords: motion; field order; dosimetric changes; correlation ... See more keywords
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A feasibility study of intrafractional tumor motion estimation based on 4D‐CBCT using diaphragm as surrogate

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recommendations! Published in 2018 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.12410

Abstract: Abstract Purpose To investigate the intrafractional stability of the motion relationship between the diaphragm and tumor, as well as the feasibility of using diaphragm motion to estimate lung tumor motion. Methods Eighty‐five paired (pre and… read more here.

Keywords: motion; image; estimation; position ... See more keywords
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Intrafraction 4D‐cone beam CT acquired during volumetric arc radiotherapy delivery: kV parameter optimization and 4D motion accuracy for lung stereotactic body radiotherapy (SBRT) patients

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recommendations! Published in 2019 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.12755

Abstract: Abstract Purpose Elekta XVI 5.0 allows for four‐dimensional cone beam computed tomography (4D CBCT) image acquisition during treatment delivery to monitor intrafraction motion. These images can have poorer image quality due to undersampling of kV… read more here.

Keywords: motion; delivery; radiotherapy; lung ... See more keywords
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Patient motion tracking for non‐isocentric and non‐coplanar treatments via fixed frame‐of‐reference 3D camera

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recommendations! Published in 2020 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.12842

Abstract: Abstract Purpose As C‐arm linac radiation therapy evolves toward faster, more efficient delivery, and more conformal dosimetry, treatments with increasingly complex couch motions are emerging. Monitoring the patient motion independently of the couch motion during… read more here.

Keywords: motion; monitoring system; patient motion; non coplanar ... See more keywords
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Commissioning a four‐dimensional Computed Tomography Simulator for minimum target size due to motion in the Anterior–Posterior direction: a procedure and treatment planning recommendations

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recommendations! Published in 2020 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.12980

Abstract: Abstract The purpose of this work is to develop a procedure for commissioning four‐dimensional computed tomography (4DCT) algorithms for minimum target reconstruction size, to quantify the effect of anterior–posterior (AP) motion artifacts on known object… read more here.

Keywords: motion; computed tomography; minimum target; procedure ... See more keywords
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Evaluation of cine imaging during multileaf collimator and gantry motion for real‐time magnetic resonance guided radiation therapy

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recommendations! Published in 2020 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.13085

Abstract: Abstract Purpose Real‐time magnetic resonance guided radiation therapy (MRgRT) uses 2D cine imaging for target tracking. This work evaluates the percent image uniformity (PIU) and spatial integrity of cine images in the presence of multileaf… read more here.

Keywords: cine images; gantry; real time; motion ... See more keywords
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Direct visualization and correlation of liver stereotactic body radiation therapy treatment delivery accuracy with interfractional motion

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recommendations! Published in 2021 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.13333

Abstract: Abstract This study used the visualization of hypo‐intense regions on liver‐specific MRI to directly quantify stereotactic body radiation therapy (SBRT) spatial delivery accuracy. Additionally, the interfractional motion of the liver region was determined and compared… read more here.

Keywords: motion; treatment; interfractional motion; delivery accuracy ... See more keywords
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MVCT versus kV‐CBCT for targets subject to respiratory motion: A phantom study

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recommendations! Published in 2021 at "Journal of Applied Clinical Medical Physics"

DOI: 10.1002/acm2.13356

Abstract: Abstract The use of kilovoltage cone‐beam computed tomography (kV‐CBCT) or megavoltage computed tomography (MVCT) for image guidance prior to lung stereotactic body radiation therapy (SBRT) is common clinical practice. We demonstrate that under equivalent respiratory… read more here.

Keywords: motion; mvct; target; cbct ... See more keywords