Ultrasound computed tomography (USCT) can visualize a target with multiple imaging contrasts, which were demonstrated individually previously. Here, to improve the imaging quality, the dynamic speed of sound (SoS) map derived from the transmission USCT will be adapted for the correction of the acoustic speed variation in the reflection USCT. The variable SoS map was firstly restored via the optimized simultaneous algebraic reconstruction technique with the time of flights selected from the transmitted ultrasonic signals. Then, the multi-stencils fast marching method was used to calculate the delay time from each element to the grids in the imaging field of view. Finally, the delay time in conventional constant-speed-assumed delay and sum (DAS) beamforming would be replaced by the practical computed delay time to achieve higher delay accuracy in the reflection USCT. The results from the numerical, phantom, and in vivo experiments show that our approach enables multi-modality imaging, accurate target localization, and precise boundary detection with the full-view fast imaging performance. The proposed method and its implementation are of great value for accurate, fast, and multi-modality USCT imaging, particularly suitable for highly acoustic heterogeneous medium.
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http://dx.doi.org/10.3390/s23073701 | DOI Listing |
J Ultrasound Med
January 2025
State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China.
Objectives: The pathogenesis of premature ovarian insufficiency (POI) not only affects the ovarian structure and function but also gives rise to complications such as osteoporosis and dyslipidemia. Although low-intensity pulsed ultrasound (LIPUS) has been proven effective in treating POI, its impact on the associated complications remains unexplored. Therefore, this study aims to investigate the effects of LIPUS irradiation on osteoporosis and dyslipidemia in a mouse model of POI.
View Article and Find Full Text PDFBackground: Axial Spondyloarthritis (axSpA) is a chronic inflammatory rheumatic condition affecting the axial skeleton, leading to pain, stiffness, and fatigue. While biologic therapies have improved clinical management, many patients experience partial or no responses, resulting in delays in disease control. Additionally, the risk of adverse events and increased costs remains a concern.
View Article and Find Full Text PDFWorld J Pediatr
January 2025
Institute of Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, Ingolstädter Landstraße 1, 85764, Neuherberg, Germany.
Background: Some studies have revealed various sleep patterns in adolescents and adults using multidimensional objective sleep parameters. However, it remains unknown whether these patterns are consistent from adolescence to young adulthood and how they relate to long-term obesity.
Methods: Seven-day accelerometry was conducted in German Infant Study on the influence of Nutrition Intervention PLUS environmental and genetic influences on allergy development (GINIplus) and Influence of Lifestyle factors on the development of the Immune System and Allergies in East and West Germany (LISA) birth cohorts during the 15-year and 20-year follow-ups, respectively.
Ir J Med Sci
January 2025
Department of General Surgery, Sorgun State Hospital, Yozgat, 66700, Turkey.
Aim: This study aimed to investigate the effect of the COVID-19 pandemic on the clinical and pathological stages of patients diagnosed with breast cancer.
Method: In this retrospective study, a total of 298 male and female patients over the age of 18 who were diagnosed with breast cancer and who were continuing surgical and oncologic treatment were included.
Results: Of the 298 patients diagnosed with breast cancer, 186 (62.
J Autism Dev Disord
January 2025
Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
There is a substantial time gap between when parents develop concerns about their child (ages 1-2) and when they receive a diagnosis of autism (ages 3-5), delaying the onset of critical interventions. Few studies have examined how the timing, type, and quantity of early parental concerns are associated with age of diagnosis. The aims of this study were to describe characteristics of parents' concerns in a large community-based sample and explore how characteristics of concerns relate to age of diagnosis.
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