Article
Radiology, Nuclear Medicine & Medical Imaging
Yuhang Shi, Stuart Clare, Signe Johanna Vannesjo
Summary: A robust shim current optimization method based on Tikhonov regularization with a variable regularization parameter lambda was proposed for higher-order dynamic shim updating. The method demonstrated reduced current norm and current steps without increasing residual field SD, leading to a negligible cost in field inhomogeneity. This approach shows promise in increasing the robustness and utility of higher-order shim updating.
MAGNETIC RESONANCE IN MEDICINE
(2022)
Article
Engineering, Electrical & Electronic
Liang Xuan, Yuxiang Zhang, Jiamin Wu, Yucheng He, Fangge Chen, Zheng Xu
Summary: This article presents a flexible active shimming approach for ultralow-field magnetic resonance imaging (ULF-MRI) system to optimize the uniformity of static magnetic field $B_{0}$. The proposed method achieves high $B_{0}$ homogeneity by using geometry-based designs for first- and second-order shim coils. Experimental results demonstrate improved $B_{0}$ homogeneity and imaging quality after implementing the optimized coils.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Devon Karl Overson, Dean Darnell, Fraser Robb, Allen W. Song, Trong-Kha Truong
Summary: A flexible iPRES coil array was developed to conform to different anatomical regions and perform high-quality imaging and localized B0 shimming with a higher SNR, shimming performance, ease of positioning, and subject comfort compared to a rigid iPRES coil array. Shimming with the flexible coil array wrapped around the knee or neck showed significant reduction in B0 RMSE and DWI image distortions. In contrast, using a rigid coil array wrapped around a larger tube for knee shimming resulted in poorer performance and reduced SNR.
MAGNETIC RESONANCE IN MEDICINE
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Jason P. Stockmann, Nicolas S. Arango, Thomas Witzel, Azma Mareyam, Charlotte Sappo, Jiazheng Zhou, Lucas Jenkins, Lincoln Craven-Brightman, Eugene Milshteyn, Mathias Davids, W. Scott Hoge, Monika Sliwiak, Shahin Nasr, Boris Keil, Elfar Adalsteinsson, Bastien Guerin, Jacob K. White, Kawin Setsompop, Jonathan R. Polimeni, Lawrence L. Wald
Summary: Adding Delta B-0 shim capability to a 31-channel 7T receive array can significantly improve 7T brain B-0 homogeneity without sacrificing the array's radiofrequency performance. Global and slice-optimized shimming provide 11% and 40% improvements respectively compared to baseline second-order spherical harmonic shimming.
MAGNETIC RESONANCE IN MEDICINE
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Devin Willey, Dean Darnell, Allen W. Song, Trong-Kha Truong
Summary: The study showed that using iPRES and modifying the cost function effectively reduced signal loss in specific brain regions during gradient-echo EPI, leading to improved imaging quality and signal intensity.
MAGNETIC RESONANCE IN MEDICINE
(2021)
Article
Engineering, Biomedical
Bruno Pinho Meneses, Alexis Amadon
Summary: By exploiting the inter-subject similarity of inhomogeneous static magnetic field patterns in the human brain during MRI examination, a small set of shim coils has been designed to replace numerous coils based on high-order Spherical Harmonics corrections. Through simulations, it has been shown that only three cylindrical coils can effectively reduce static field inhomogeneity in the brain, outperforming 16 high-order Spherical Harmonics coils.
PHYSICS IN MEDICINE AND BIOLOGY
(2021)
Article
Biophysics
Jullie W. Pan, Melissa J. Terpstra, Chan-Hong Moon, Hoby P. Hetherington
Summary: The role of advanced shim methods in single voxel spectroscopy (SVS) for in vivo brain spectroscopy has been questioned. To assess this, SVS was acquired from two loci of neurophysiological interest using different shim methods. The results showed that high order and map-based B-0 shim methods improved the accuracy and consistency of spectroscopic data.
NMR IN BIOMEDICINE
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Jonathan D. Cuthbertson, Trong-Kha Truong, Robert Stormont, Fraser Robb, Allen W. Song, Dean Darnell
Summary: This study develops a wireless integrated coil array for simultaneous imaging and wireless localized B-0 shimming, to correct for distortions in DTI of the spinal cord. The coil modifications do not degrade the SNR and the wireless performance is minimally impacted. The iPRES-W coil array can perform imaging and wireless localized B-0 shimming with no SNR degradation, without any scanner modifications or additional antenna systems within the scanner bore.
MAGNETIC RESONANCE IN MEDICINE
(2022)
Article
Computer Science, Artificial Intelligence
Yongqiao Wang, He Ni
Summary: This paper studies nonparametric estimation of the discount curve and proposes a method that approximates the curve using algebraic polynomials and ensures shape compliance. Experimental results demonstrate the superiority of this method.
JOURNAL OF INTELLIGENT & FUZZY SYSTEMS
(2022)
Article
Automation & Control Systems
Xiaogang Xiong, Ankit Sachan, Ruining Huang, Anil Kumar Pal, Shyam Kamal, Wei Chen
Summary: This article explores an implicit Euler algorithm for digital implementation of constrained stabilization in second-order systems. A switching controller is designed to achieve convergence of position and velocity outputs to predetermined ranges or the origin in finite-time. This approach effectively avoids chattering caused by conventional explicit integration schemes.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Michael Schwerter, Markus Zimmermann, Joerg Felder, N. Jon Shah
Summary: This study proposes two innovations to characterize eddy current fields, including an efficient spatio-temporal sampling scheme and model-based fitting of spherical harmonic components. These techniques are applied in simulations and experiments to demonstrate their effectiveness in evaluating and compensating for eddy current fields.
MAGNETIC RESONANCE IN MEDICINE
(2021)
Article
Engineering, Manufacturing
Xiaogang Li, Xiaoqing Kang, Hong Xiao, Yugang Duan
Summary: In this study, a low adhesion continuous constrained-surface projection stereolithography process based on curing degree control was proposed to reduce separation force and improve printing efficiency and accuracy. By adjusting the ratio of the composite resin, the curing degree of the resin during the printing process was controlled, leading to weakened separation force between the cured part and the resin tank. The results showed improved part printing accuracy and enhanced mechanical properties.
ADDITIVE MANUFACTURING
(2022)
Article
Computer Science, Artificial Intelligence
Jing Li, Xiao Wei, Qiuhui Li, Yali Zhang, Ze Li, Jin Li, Jinjia Wang
Summary: This paper proposes a slice-based 0-constrained nonconvex CDL problem and introduces a novel method named PGNOA. Experimental results demonstrate that PGNOA performs better than existing slice-based convex CDL methods and Fourier-based nonconvex CDL methods in terms of the objective function value. Moreover, the dictionaries learned from PGNOA achieve better results in image inpainting and image separation tasks.
KNOWLEDGE-BASED SYSTEMS
(2023)
Article
Engineering, Civil
Xiaolong Yang, Meng Gao, Liangbo Xie, Mu Zhou
Summary: With the arrival of the new era of 6G, there will be great demands and challenges for new applications of smart factories and intelligent transportation systems based on real-time wireless sensing technology. In the intelligent transportation system, it is important to achieve services like localization and intrusion detection for intelligent vehicles. To overcome the problem of unacceptable delay and bandwidth requirements in large-scale wireless networks caused by a large amount of channel state information (CSI) data transmission, a novel algorithm named PAOFIT is proposed, which includes a projection transformation aided CSI curve fitting compression algorithm and an adaptive weighted average fitting order judgment algorithm. Experimental results show that PAOFIT outperforms existing compression algorithms in terms of compression ratio, median positioning error, residual, and execution time.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Energy & Fuels
Xiangqing Yin, Yi Liu, Li Yang, Wenchao Gao
Summary: With the increase in scale of wind turbines, the issue of data quality has become prominent, leading to the proposal of a method based on constrained curve fitting for cleaning abnormal data effectively. This method is insensitive to parameters, simple in calculation, and easy to automate, showing good performance even with historical data containing numerous abnormal data.
Article
Radiology, Nuclear Medicine & Medical Imaging
Layla Tabea Riemann, Christoph Stefan Aigner, Stephen L. R. Ellison, Rudiger Bruehl, Ralf Mekle, Sebastian Schmitter, Oliver Speck, Georg Rose, Bernd Ittermann, Ariane Fillmer
Summary: This study introduced a framework to evaluate the repeatability, reproducibility, and minimal detectable changes of metabolite concentrations determined by in vivo MRS. An unbalanced nested study design and statistical analysis tools were used to acquire data with specific scenarios and assess variance contributions.
MAGNETIC RESONANCE IN MEDICINE
(2022)
Article
Neurosciences
Steve C. N. Hui, Mark Mikkelsen, Helge J. Zollner, Vishwadeep Ahluwalia, Sarael Alcauter, Laima Baltusis, Deborah A. Barany, Laura R. Barlow, Robert Becker, Jeffrey Berman, Adam Berrington, Pallab K. Bhattacharyya, Jakob Udby Blicher, Wolfgang Bogner, Mark S. Brown, Vince D. Calhoun, Ryan Castillo, Kim M. Cecil, Yeo Bi Choi, Winnie C. W. Chu, William T. Clarke, Alexander R. Craven, Koen Cuypers, Michael Dacko, Camilo de la Fuente-Sandoval, Patricia Desmond, Aleksandra Domagalik, Julien Dumont, Niall W. Duncan, Ulrike Dydak, Katherine Dyke, David A. Edmondson, Gabriele Ende, Lars Ersland, C. John Evans, Alan S. R. Fermin, Antonio Ferretti, Ariane Fillmer, Tao Gong, Ian Greenhouse, James T. Grist, Meng Gu, Ashley D. Harris, Katarzyna Hatz, Stefanie Heba, Eva Heckova, John P. Hegarty, Kirstin-Friederike Heise, Shiori Honda, Aaron Jacobson, Jacobus F. A. Jansen, Christopher W. Jenkins, Stephen J. Johnston, Christoph Juchem, Alayar Kangarlu, Adam B. Kerr, Karl Landheer, Thomas Lange, Phil Lee, Swati Rane Levendovszky, Catherine Limperopoulos, Feng Liu, William Lloyd, David J. Lythgoe, Maro G. Machizawa, Erin L. MacMillan, Richard J. Maddock, Andrei Manzhurtsev, Maria L. Martinez-Gudino, Jack J. Miller, Heline Mirzakhanian, Marta Moreno-Ortega, Paul G. Mullins, Shinichiro Nakajima, Jamie Near, Ralph Noeske, Wibeke Nordhoy, Georg Oeltzschner, Raul Osorio-Duran, Maria C. G. Otaduy, Erick H. Pasaye, Ronald Peeters, Scott J. Peltier, Ulrich Pilatus, Nenad Polomac, Eric C. Porges, Subechhya Pradhan, James Joseph Prisciandaro, Nicolaas A. Puts, Caroline D. Rae, Francisco Reyes-Madrigal, Timothy P. L. Roberts, Caroline E. Robertson, Jens T. Rosenberg, Diana-Georgiana Rotaru, Ruth L. O'Gorman Tuura, Muhammad G. Saleh, Kristian Sandberg, Ryan Sangill, Keith Schembri, Anouk Schrantee, Natalia A. Semenova, Debra Singel, Rouslan Sitnikov, Jolinda Smith, Yulu Song, Craig Stark, Diederick Stoffers, Stephan P. Swinnen, Rongwen Tain, Costin Tanase, Sofie Tapper, Martin Tegenthoff, Thomas Thiel, Marc Thioux, Peter Truong, Pim van Dijk, Nolan Vella, Rishma Vidyasagar, Andrej Vovk, Guangbin Wang, Lars T. Westlye, Timothy K. Wilbur, William R. Willoughby, Martin Wilson, Hans-Jorg Wittsack, Adam J. Woods, Yen-Chien Wu, Junqian Xu, Maria Yanez Lopez, David K. W. Yeung, Qun Zhao, Xiaopeng Zhou, Gasper Zupan, Richard A. E. Edden
Summary: The study aimed to assess the need for real-time field-frequency locking on MRI scanners by analyzing frequency drift data from 95 3T MRI scanners. The results showed relatively low levels of drift with differences across scanners, and both linear and nonlinear drifts were observed.
Article
Biophysics
David Willis, Donnie Cameron, Bahman Kasmai, Vassilios S. Vassiliou, Paul N. Malcolm, Gabriella Baio
Summary: This study presents a method for quantitatively measuring motion within the bowel using existing MRI pulse sequences with minimal bowel preparation, addressing limitations in current MRI methods. The method aims to provide both two and three-dimensional measurements of bowel motility, showing promise for noninvasive assessment and potential customization for specific regions of interest and behaviors within the bowel.
NMR IN BIOMEDICINE
(2022)
Article
Physiology
Donnie Cameron, Adrian Soto-Mota, David R. Willis, Jane Ellis, Nathan E. K. Procter, Richard Greenwood, Neil Saunders, Rolf F. Schulte, Vassilios S. Vassiliou, Damian J. Tyler, Albrecht Ingo Schmid, Christopher T. Rodgers, Paul N. Malcolm, Kieran Clarke, Michael P. Frenneaux, Ladislav Valkovic
Summary: In this study, the potential benefit of ketone supplementation in humans was investigated by studying cardiac and skeletal muscle metabolism. Acute ketone supplementation caused mild ketosis in blood, but did not result in significant changes in cardiac or skeletal muscle energy metabolism parameters.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Clinical Neurology
Barbara Manini, Valeria Vinogradova, Bencie Woll, Donnie Cameron, Martin Eimer, Velia Cardin
Summary: Using functional MRI, researchers found that deaf individuals specifically recruit 'auditory' regions during task switching, and neural activity in the superior temporal regions, especially in the right hemisphere, predicts behavioral performance in deaf individuals. This indicates that sensory cortices can adapt their function to higher-order cognition, suggesting that sensory experience influences cortical reorganization and executive processing in the brain.
Article
Nutrition & Dietetics
Emma Flanagan, Donnie Cameron, Rashed Sobhan, Chloe Wong, Matthew G. Pontifex, Nicole Tosi, Pedro Mena, Daniele Del Rio, Saber Sami, Arjan Narbad, Michael Mueller, Michael Hornberger, David Vauzour
Summary: This study suggests that daily cranberry supplementation can improve episodic memory performance and neural functioning in older adults, while also reducing LDL cholesterol levels.
FRONTIERS IN NUTRITION
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Layla Tabea Riemann, Christoph Stefan Aigner, Ralf Mekle, Oliver Speck, Georg Rose, Bernd Ittermann, Sebastian Schmitter, Ariane Fillmer
Summary: The study demonstrated the use of the 2SPECIAL sequence coupled with the novel voxel-GRAPPA decomposition technique to simultaneously acquire spectroscopic signals from two MRS voxels without significant loss in SNR, reducing total scan time by 21.6%. The voxel-GRAPPA algorithm properly reassigned signal components to their respective regions, showing comparable performance to the SENSE-based algorithm in terms of leakage and Cramer-Rao lower bounds for in vivo applications.
MAGNETIC RESONANCE IN MEDICINE
(2022)
Review
Chemistry, Multidisciplinary
Vasiliki Tsampasian, Ioannis Merinopoulos, Donnie Cameron, Pankaj Garg, Vassilios S. Vassiliou
Summary: Myocardial inflammation is proposed as a common mechanism underlying the development and progression of cardiovascular diseases. Cardiac magnetic resonance (CMR) is a non-invasive technique that allows direct visualization of the myocardium. The use of ultrasmall superparamagnetic particles of iron oxide (USPIO) in CMR is gaining research interest and can provide valuable information for identifying active inflammation in the myocardium, which is hypothesized to be the substrate for adverse remodeling and heart failure.
APPLIED SCIENCES-BASEL
(2022)
Article
Cardiac & Cardiovascular Systems
Paul Njoku, Ciaran Grafton-Clarke, Hosamadin Assadi, Rebecca Gosling, Gareth Archer, Andrew J. Swift, Paul D. Morris, Abdulaziz Albaraikan, Gareth Williams, Jos Westenberg, Jean-Paul Aben, Leon Ledoux, Samer Alabed, Marcus Flather, Donnie Cameron, Jordi Broncano Cabrero, Javier Royuela Del Val, Sunil Nair, Alisdair Ryding, Chris Sawh, Peter P. Swoboda, Eylem Levelt, Amrit Chowdhary, Vassilios Vassiliou, Liang Zhong, Pankaj Garg
Summary: This study validates the accuracy and reproducibility of an automated dynamic peak velocity tracking method using 4D flow CMR for measuring the peak velocity of mitral inflow. The results show that this method is comparable to Doppler echocardiography and can be used for clinical assessment.
INTERNATIONAL JOURNAL OF CARDIOLOGY
(2022)
Meeting Abstract
Clinical Neurology
D. Cameron, T. Abbassi-Daloii, L. Heezen, N. van de Velde, Z. Koeks, T. Veeger, M. Hooijmans, J. Verschuuren, M. van Putten, A. Aartsma-Rus, V. Raz, P. Spitali, E. Niks, H. Kan
NEUROMUSCULAR DISORDERS
(2022)
Review
Medicine, General & Internal
Efthymia Maria Kapasouri, Diomidis C. C. Ioannidis, Donnie Cameron, Vassilios S. S. Vassiliou, Michael Hornberger
Summary: This study aimed to systematically review and analyze the role of cerebral blood flow (CBF) in the medial temporal lobe (MTL) using arterial spin labeling magnetic resonance imaging (ASL-MRI) in patients with Alzheimer's disease (AD), individuals with mild cognitive impairment (MCI), and cognitively normal adults (CN). The results showed that CBF measured via ASL-MRI was impaired in AD compared to the CN group in subregions of the MTL, while there was no significant difference between MCI and CN participants in the MTL.
Review
Medicine, General & Internal
Vasiliki Tsampasian, Donnie Cameron, Rashed Sobhan, George Bazoukis, Vassilios S. Vassiliou
Summary: The heart relies on efficient energy substrate utilization for normal function, and abnormalities in myocardial energetics can lead to heart failure symptoms. Phosphorus magnetic resonance spectroscopy (P-31 MRS) is the only non-invasive method available to evaluate myocardial metabolic state in vivo. This review summarizes the importance of myocardial energetics and provides a systematic review of studies utilizing P-31 MRS in various cardiac pathologies.
MEDICINA-LITHUANIA
(2023)
Meeting Abstract
Cardiac & Cardiovascular Systems
Alice M. Mezincescu, Amelia Rudd, Lesley Cheyne, Graham Horgan, Sam Philip, Donnie Cameron, Luc van Loon, Philip Whitfield, Rachael Gribbin, Mirela Delibegovic, Barbara Fielding, Stuart Gray, Anke Henning, Dana K. Dawson
Meeting Abstract
Nutrition & Dietetics
J. Scott, A. A. Welch, T. Tanaka, L. Ferrucci, D. Cameron
PROCEEDINGS OF THE NUTRITION SOCIETY
(2022)
Article
Medicine, Research & Experimental
Christian Prinz, Ludger Starke, Jason M. Millward, Ariane Fillmer, Paula Ramos Delgado, Helmar Waiczies, Andreas Pohlmann, Michael Rothe, Marc Nazare, Friedemann Paul, Thoralf Niendorf, Sonia Waiczies
Summary: This study successfully demonstrated the feasibility of using F-19 MR methods to detect TF in vivo, showing a significant correlation between TF concentrations and F-19 MR signals. The results highlight the potential application of F-19 MR technology in monitoring neuro-inflammation, emphasizing the need for further technological advancements in this field.
