Spatially selective RF waveforms were designed and demonstrated for parallel excitation with a dedicated eight-coil transmit array on a modified 3T human MRI scanner. Measured excitation profiles of individual coils in the array were used in a low-flip-angle pulse design to achieve desired spatial target profiles with two- (2D) and three-dimensional (3D) k-space excitation with simultaneous transmission of RF on eight channels. The 2D pulse excited a high-resolution spatial pattern in-plane, while the 3D trajectory produced high-quality slice selection with a uniform in-plane excitation despite the highly nonuniform individual spatial profiles of the coil array. The multichannel parallel RF excitation was used to accelerate the 2D excitation by factors of 2-8, and experimental results were in excellent agreement with simulations based on the measured coil maps. Parallel RF transmission may become critical for robust and routine human studies at very high field strengths where B(1) inhomogeneity is commonly severe.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/mrm.21042 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Sources of HIV information and women's HIV knowledge in Southwest Sumba Indonesia: a cross-sectional study with mediation analysis.
BMC Public Health
January 2025
Public Policy, Management, and Analytics, College of Urban Planning and Public Affairs, University of Illinois at Chicago, Chicago, IL, 60607, USA.
Background: Despite multiple years of government HIV educational efforts, the growing trend of new cases among women in Indonesia runs parallel with their seemingly overall lack of comprehensive knowledge about HIV. A major prevention challenge for the Indonesian government lies in delivering HIV prevention education across the world's largest archipelago. This study investigates comprehensive HIV knowledge among reproductive-age women in Southwest Sumba, Indonesia, and the sources through which they report having learned about HIV along with potential mediators of the relationship between socioeconomic status (SES) and HIV knowledge.
View Article and Find Full Text PDFArtificial molecular communication network based on DNA nanostructures recognition.
Nat Commun
January 2025
Key Laboratory for Organic Electronics and Information Displays (KLOEID), Nanjing University of Posts and Telecommunications, Nanjing, China.
Artificial simulated communication networks inspired by molecular communication in organisms use biological and chemical molecules as information carriers to realize information transmission. However, the design of programmable, multiplexed and general simulation models remains challenging. Here, we develop a DNA nanostructure recognition-based artificial molecular communication network (DR-AMCN), in which rectangular DNA origami nanostructures serve as nodes and their recognition as edges.
View Article and Find Full Text PDFVersatile parallel signal processing with a scalable silicon photonic chip.
Nat Commun
January 2025
State Key Laboratory for Extreme Photonics and Instrumentation, Center for Optical & Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics (Haining), Zhejiang University, Hangzhou, China.
Silicon photonic signal processors promise a new generation of signal processing hardware with significant advancements in processing bandwidth, low power consumption, and minimal latency. Programmable silicon photonic signal processors, facilitated by tuning elements, can reduce hardware development cycles and costs. However, traditional programmable photonic signal processors based on optical switches face scalability and performance challenges due to control complexity and transmission losses.
View Article and Find Full Text PDFWhat about language?
Behav Brain Sci
January 2025
Department of Spanish, Linguistics, and Theory of Literature (Linguistics), Faculty of Philology, University of Seville, Seville, http://antoniobenitez.wix.com/benitez-burraco.
Myths about a remote shared past can certainly promote cooperation between distantly related people, seemingly via their impact on our social cognition, and ultimately facilitate the achievement of complex tasks in large-scale societies. Nonetheless, the creation and transmission of these complex narratives are not possible without the parallel development of sophisticated language(s), endowed with properties like displacement (enabling mental travels in space and time) and complex syntax (enabling the assembly and communication of complex thoughts).
View Article and Find Full Text PDFDevelopment and Clinical Detection of Rapid Molecular Diagnostic System for Pathogenic Dermatophytes of Tinea Capitis of Multiple Centres in China.
Mycoses
January 2025
Department of Dermatology and Venereology, Peking University First Hospital, Beijing, China.
Objectives: Tinea capitis remains a common fungal infection in children worldwide. Species identification is critical for determining the source of infection and reducing transmission. In conventional methods, macro- and microscopic analysis is time-consuming and results in slow fungal growth or low specificity.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!