In evaluating the sensitivity of arterial spin labeling (CASL) and for quantification of perfusion, knowledge of the transit time from the labeling plane to the imaging slice is crucial. The purpose of the current study was to obtain estimates of transit times relevant under the specific experimental conditions of CASL in human subjects using a separate local labeling coil at the neck. Specifically, the post-label delay (PLD), i.e. the time between the end of the labeling period and the image acquisition, was varied either with or without additional application of crusher gradients to suppress intravascular signal contributions. The overall sensitivity change for varying the PLD between 1000 and 1700 ms was low. A tissue transit time from the neck to an axial supraventricular section through Broca's knee was obtained by fitting the PLD dependence to a two-compartment model. Averaging over subjects yielded 1930 +/- 110 ms for the tissue transit time, and 73 +/- 5 ml min(-1) 100 g(-1) for the cerebral blood flow. Small areas that exhibited a very high signal change upon labeling were indicative of regional variation in cerebral blood flow related to vascular anatomy.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/nbm.917 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Bridging Gaps: Enhancing Sleep and Health Disparities in Latino Families with Young Adults with Autism Using a Culturally Adapted Intervention.
J Racial Ethn Health Disparities
January 2025
Louis A. Faillace, MD, Department of Psychiatry and Behavioral Sciences, McGovern Medical School, UTHealth Science Center at Houston, UTHealth Houston Behavioral and Biomedical Sciences Building, 1941 East Rd, Houston, TX, 77054, USA.
The present study examined the effects of a culturally adapted intervention, ¡Iniciando! la Adultez, on sleep and health-related quality of life (HRQoL) in Latino young adults with autism spectrum disorder (ASD) and their Spanish-speaking parents. The intervention targeted the transition to adulthood, a period associated with increased challenges in sleep and HRQoL, particularly for underserved Latino populations. Participants included 26 young adults and 38 parents who completed assessments at baseline and post-treatment.
View Article and Find Full Text PDFPrognostic scores for predicting overall survival in patients with metastatic renal and urothelial cancer undergoing immunotherapy - which one to use?
World J Urol
January 2025
Department of Urology, University of Kiel (UKSH), Arnold-Heller-Strasse 1-3, 24105, Kiel, Germany.
Purpose: Evaluation of the prognostic significance of four different scoring systems in a real-world cohort of patients with metastatic urothelial carcinoma (mUC) or renal cell carcinoma (mRCC) undergoing immunotherapy (IO).
Methods: For 120 patients with mUC (n = 67) and mRCC (n = 53) who received IO between July 2016 and December 2020 at the tertiary Urological University Medical Centre Mannheim, the following scores were recorded at pre-treatment baseline: modified Glasgow prognostic score (mGPS), systemic immune-inflammation index (SII), neutrophil-to-lymphocyte ratio (NLR), neutrophil-to-eosinophil ratio (NER). Overall survival (time between the beginning of IO until the patients' death or last contact) was determined for every patient.
Time-resolved Brownian tomography of single nanocrystals in liquid during oxidative etching.
Nat Commun
January 2025
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea.
Colloidal nanocrystals inherently undergo structural changes during chemical reactions. The robust structure-property relationships, originating from their nanoscale dimensions, underscore the significance of comprehending the dynamic structural behavior of nanocrystals in reactive chemical media. Moreover, the complexity and heterogeneity inherent in their atomic structures require tracking of structural transitions in individual nanocrystals at three-dimensional (3D) atomic resolution.
View Article and Find Full Text PDFWinding up to wind down: designing the end of one's medical career with intentionality.
BMJ Lead
January 2025
University of Louisville Health Sciences Center, Louisville, Kentucky, USA.
Background: Physicians are planful beings, spending much time imagining and trying to design their ideal careers. Yet, despite actuarial expectations that physicians may spend almost two decades in retirement, it is paradoxical that little attention is generally given to designing an ideal retirement.
Methods: The coauthors are physicians in the latter parts of their careers who both teach leadership to physicians and have thought deeply about physician transitions, including retirement.
Coalescence of multiple topological orders in quasi-one-dimensional bismuth halide chains.
Nat Commun
January 2025
School of Physics, Beihang University, Haidian District, Beijing, China.
Topology is being widely adopted to understand and to categorize quantum matter in modern physics. The nexus of topology orders, which engenders distinct quantum phases with benefits to both fundamental research and practical applications for future quantum devices, can be driven by topological phase transition through modulating intrinsic or extrinsic ordering parameters. The conjoined topology, however, is still elusive in experiments due to the lack of suitable material platforms.
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!