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. 2019 Feb;46(1):29-35.
doi: 10.1016/j.neurad.2018.03.002. Epub 2018 Mar 28.

Effect of blood T1 estimation strategy on arterial spin labeled cerebral blood flow quantification in children and young adults with kidney disease

Hua-Shan Liu  1 , Abbas F Jawad  2 , Nina Laney  3 , Erum A Hartung  4 , Susan L Furth  5 , John A Detre  6
Affiliations

Effect of blood T1 estimation strategy on arterial spin labeled cerebral blood flow quantification in children and young adults with kidney disease

Hua-Shan Liu et al. J Neuroradiol. 2019 Feb.

Abstract

Purpose: To compare blood T1 estimation approaches used for quantifying cerebral blood flow (CBF) with arterial spin labeled (ASL) perfusion MRI in a developmental cohort of chronic kidney disease (CKD) patients with anemia and a control group.

Methods: 61 patients with CKD and 47 age-matched control subjects were studied. Blood T1 approaches included: (1) a fixed value, (2) estimation based on measured hematocrit (Hct), and (3) estimation based on Age+Sex using a published formula. Resulting T1 and CBF values were compared along with group, age and sex effects.

Results: Highly significant group differences in CBF using fixed blood T1 were reduced when Hct-corrected blood T1 was used, and were eliminated entirely when using the Age+Sex estimated approach. In the control cohort, fixed T1 method showed the strongest correlations of CBF with age and sex. Hct-corrected T1 preserved a significant correlation between CBF and age and sex, while Age+Sex estimated T1 produced a poor fit of CBF with age and sex.

Conclusions: Blood T1 estimation method can confound the interpretation of CBF changes measured using ASL MRI in patients with CKD. Blood T1 should ideally be corrected for hematocrit effects in clinical populations with anemia.

Keywords: Anemia; Arterial spin labeling; Cerebral blood flow; Chronic kidney disease; T1 correction.

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Conflict of interest statement

Disclosure

All of the authors declared no competing interests.

Figures

Figure 1
Figure 1
CBF measurements using three different T1 methods (fixed T1, Hct based, and Age+Sex based) in each subgroup (males and females in CKD, and males and females in controls). A. gray matter (GM), B. white matter (WM) and C. whole brain (WB) areas. *P<0.05
Figure 1
Figure 1
CBF measurements using three different T1 methods (fixed T1, Hct based, and Age+Sex based) in each subgroup (males and females in CKD, and males and females in controls). A. gray matter (GM), B. white matter (WM) and C. whole brain (WB) areas. *P<0.05
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