The longitudinal relaxation time of blood is a crucial parameter for quantification of cerebral blood flow by arterial spin labeling and is one of the main determinants of the signal-to-noise ratio of the resulting perfusion maps. Whereas at low and medium magnetic field strengths (B0), its in vivo value is well established; at ultra-high field, this is still uncertain. In this study, longitudinal relaxation time of blood in the sagittal sinus was measured at 1.5 T, 3 T, and 7 T. A nonselective inversion pulse preceding a Look-Locker echo planar imaging sequence was performed to obtain the inversion recovery curve of venous blood. The results showed that longitudinal relaxation time of blood at 7 T was ∼ 2.1 s which translates to an anticipated 33% gain in the signal-to-noise ratio in arterial spin labeling experiments due to T1 relaxation alone compared with 3 T. In addition, the linear relationship between longitudinal relaxation time of blood and B0 was confirmed.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/mrm.24550 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Temperature-Dependent Magnetic Resonance Relaxation Behaviors in Porous Materials.
Phys Rev Lett
December 2024
University of New Brunswick, UNB MRI Centre, Department of Physics, Fredericton, New Brunswick, E3B 5A3, Canada.
We observe divergent temperature-dependent magnetic resonance relaxation behaviors across various brine-saturated porous materials. The paramagnetic and diamagnetic nature of the samples underlies these divergent behaviors. The temperature-dependent trends of the longitudinal T_{1} and transverse T_{2} relaxation times are systematically explained via distinct relaxation-diffusion regimes of Brownstein-Tarr theory.
View Article and Find Full Text PDFLongitudinal Assessment of Pulmonary Involvement and Prognosis in Different Subtypes of COVID-19 Patients After One Year Using Low-Dose CT: A Prospective Observational Study.
Acad Radiol
January 2025
Radiology Department, the First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China (J.Z., F.X., Q.S., J.T., S.W., X.L.). Electronic address:
Rationale And Objectives: Severe COVID-19 typically results in pulmonary sequelae. However, current research lacks clarity on the differences in these sequelae among various clinical subtypes. This study aimed to evaluate the changing lung imaging features and predictive factors in patients with COVID-19 pneumonia in northern China over a 12-month follow-up period after the relaxation of COVID-19 restrictions in 2022.
View Article and Find Full Text PDFThe Fitness, Rest, and Exercise for Strength and Health (FRESH) Study: A Three-Year Comparison of College Students' Perceived and Measured Health Metrics.
Nutrients
January 2025
Department of Exercise and Nutrition Sciences, Milken Institute School of Public Health, The George Washington University, Washington, DC 20052, USA.
The undergraduate college years are a critical transition period for young adults in establishing life-long health behaviors. : Within the FRESH Study, we aimed to understand the relationship between perceived physical health, perceived mental health, and specific health metrics (e.g.
View Article and Find Full Text PDFThe role of interoception in lifestyle factors: A systematic review.
Neurosci Biobehav Rev
January 2025
Health Campus the Hague, Department of Public Health and Primary Care, Leiden University Medical Center, The Hague, the Netherlands. Electronic address:
Background: Interoception, the perception of the internal state of the body, offers an underrepresented and intriguing potential avenue for altering lifestyle-related behaviors. Interoception is intrinsically related to maintaining homeostasis and the flexible allostatic regulation of complex demands. Internal bodily states may also be influenced by lifestyle factors and related problems.
View Article and Find Full Text PDFAutomated classification of stress and relaxation responses in major depressive disorder, panic disorder, and healthy participants via heart rate variability.
Front Psychiatry
January 2025
Department of Psychiatry, Korea University College of Medicine, Seoul, Republic of Korea.
Background: Stress is a significant risk factor for psychiatric disorders such as major depressive disorder (MDD) and panic disorder (PD). This highlights the need for advanced stress-monitoring technologies to improve treatment. Stress affects the autonomic nervous system, which can be evaluated via heart rate variability (HRV).
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!