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Investigating the effects of table movement and sag on optical surrogate-driven respiratory-guided computed tomography.
J Appl Clin Med Phys
November 2024
Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Universitätsstraße 27, Erlangen, Germany.
Purpose: Respiratory-guided computed tomography (CT) typically employs breathing motion surrogates to feed image reconstruction or visual breathing coaching. Our study aimed to assess the impact of table movements and table sag on the breathing curves recorded in four-dimensional (4D) CT and deep-inspiration breath-hold (DIBH) CT.
Methods: For breathing curve measurements, static and dynamic phantom scenarios were used.
The Correlation Between Static and Dynamic Facial Asymmetry in Unilateral Cleft Lip and Palate.
Cleft Palate Craniofac J
November 2024
Oral and Maxillofacial Surgery, Scottish Craniofacial Research Group, Glasgow University Dental Hospital and School, School of Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK.
Objective: Assess the relationship between static and dynamic facial asymmetry in unilateral cleft lip and palate during maximum smile.
Design: Retrospective cross-sectional study.
Setting: Multidisciplinary dentofacial planning clinic.
Development of a novel 3D-printed dynamic anthropomorphic thorax phantom for evaluation of four-dimensional computed tomography.
Phys Imaging Radiat Oncol
October 2024
Department of Radiation Oncology (Maastro), GROW Research Institute for Oncology and Reproduction, Maastricht University Medical Centre+, Maastricht, The Netherlands.
Background And Purpose: In radiotherapy, the image quality of four-dimensional computed tomography (4DCT) is often degraded by artifacts resulting from breathing irregularities. Quality assurance mostly employ simplistic phantoms, not fully representing complexities and dynamics in patients. 3D-printing allows for design of highly customized phantoms.
View Article and Find Full Text PDFReconstruction of all-sky daily air temperature datasets with high accuracy in China from 2003 to 2022.
Sci Data
October 2024
State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
A high-accuracy, continuous air temperature (Ta) dataset with high spatiotemporal resolution is essential for human health, disease prediction, and energy management. Existing datasets consider factors such as elevation, latitude, and surface temperature but insufficiently address meteorological and spatiotemporal factors, affecting accuracy. Additionally, no high-resolution dataset currently includes daily maximum (T), minimum (T), and mean (T) temperatures generated using a unified methodology.
View Article and Find Full Text PDFAssessment of abnormal transvalvular flow and wall shear stress direction for pediatric/young adults with bicuspid aortic valve: A cross-sectional four-dimensional flow study.
J Cardiovasc Magn Reson
December 2024
Department of Radiology, Section of Pediatric Radiology, Children's Hospital Colorado, University of Colorado Anschutz Medical Campus, 13123 E 16th Ave, Aurora, Colorado 80045, USA; Department of Bioengineering, University of Colorado Anschutz Medical Campus, 12705 E Montview Blvd, Aurora, Colorado 80045, USA. Electronic address:
Background: Aortic dilation is seen in pediatric/young adult patients with bicuspid aortic valve (BAV), and hemodynamic markers to predict aortic dilation are necessary for monitoring. Although promising hemodynamic metrics, such as abnormal wall shear stress (WSS) magnitude, have been proposed for adult BAV patients using four-dimensional (4D) flow cardiovascular magnetic resonance, those for pediatric BAV patients have less frequently been reported, partly due to scarcity of data to define normal WSS range. To circumvent this challenge, this study aims to investigate if a recently proposed 4D flow-based hemodynamic measurement, abnormal flow directionality, is associated with aortic dilation in pediatric/young adult BAV patients.
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