In vivo venous blood T1 measurement using inversion recovery true-FISP in children and adults
Journal
Magnetic Resonance in Medicine
Journal Volume
64
Journal Issue
4
Pages
1140-1147
Date Issued
2010
Author(s)
Abstract
A time-efficient method is described for in vivo venous blood T1 measurement using multiphase inversion-recovery-prepared balanced steady-state free precession imaging. Computer simulations and validation experiments using a flow phantom were carried out to demonstrate the accuracy of the proposed method for measuring blood T1 by taking advantage of the continuous inflow of fresh blood with longitudinal magnetization undisturbed by previous radiofrequency pulses. In vivo measurement of venous blood T1 in the sagittal sinus was carried out in 26 healthy children and adults aged 7-39 years. The measured venous blood T1 values decreased with age as a whole (P = 0.006) and were higher in females than males (P = 0.013), matching the expected developmental changes and gender differences in human hematocrit level. The estimated mean blood T1 values were highly correlated with normal hematocrit levels across age and gender groups (Spearman's r = 0.93, P = 0.008). The longitudinal repeatability of this technique was 4.0% as measured by the within-subject coefficient of variation. The proposed multiphase inversion recovery-prepared balanced steady-state free precession imaging method is a feasible technique for fast (<1 min) and reliable in vivo venous blood T1 measurement and may serve as an index of hematocrit level in individual subjects. ? 2010 Wiley-Liss, Inc.
Subjects
Hematocrit; Inversion recovery; Longitudinal relaxation; True-FISP
SDGs
Other Subjects
Image processing; Patient rehabilitation; Recovery; Coefficient of variation; Hematocrit; Inversion recovery; Longitudinal magnetization; Longitudinal relaxation; Steady state free precessions; Time-efficient methods; True-FISP; Blood; accuracy; adult; analytic method; article; child; computer simulation; feasibility study; female; gender; hematocrit; human; human experiment; in vivo study; male; measurement; normal human; nuclear magnetic resonance imaging; phantom; radiofrequency; reproducibility; steady state; validation process; venous blood
Type
journal article