A subject‐specific assessment of measurement errors and their correction in cerebrospinal fluid velocity maps using 4D flow MRI

Purpose Phase‐contrast MRI (PC‐MRI) of cerebrospinal fluid (CSF) velocity is used to evaluate the characteristics of intracranial diseases, such as normal‐pressure hydrocephalus (NPH). Nevertheless, PC‐MRI has several potential error sources, with eddy‐current‐based phase offset error being non‐negl...

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Vydané v:Magnetic resonance in medicine Ročník 87; číslo 5; s. 2412 - 2423
Hlavní autori: Yavuz Ilik, Selin, Otani, Tomohiro, Yamada, Shigeki, Watanabe, Yoshiyuki, Wada, Shigeo
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States Wiley Subscription Services, Inc 01.05.2022
Predmet:
Algorithms
Cerebral Aqueduct
Cerebrospinal fluid
Cerebrospinal Fluid - diagnostic imaging
Eddy currents
eddy‐current‐based phase offset error
Error analysis
Error correction
Evaluation
Flow mapping
Humans
Hydrocephalus
Hydrocephalus, Normal Pressure - diagnostic imaging
Magnetic resonance imaging
Magnetic Resonance Imaging - methods
normal pressure hydrocephalus
Phase‐contrast magnetic resonance imaging
Polynomials
Regression analysis
Robustness (mathematics)
Spatial dependencies
Standard error
Velocity
eddy-current-based phase offset error
cerebral aqueduct
normal pressure hydrocephalus
Phase-contrast magnetic resonance imaging
cerebrospinal fluid
ISSN:0740-3194, 1522-2594, 1522-2594
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Shrnutí:Purpose Phase‐contrast MRI (PC‐MRI) of cerebrospinal fluid (CSF) velocity is used to evaluate the characteristics of intracranial diseases, such as normal‐pressure hydrocephalus (NPH). Nevertheless, PC‐MRI has several potential error sources, with eddy‐current‐based phase offset error being non‐negligible in CSF measurement. In this study, we assess the measurement error of CSF velocity maps obtained using 4D flow MRI and evaluate correction methods. Methods CSF velocity maps of 10 patients with NPH were acquired using 4D flow MRI (velocity‐encoding = 5 cm/s). Distributed phase offset error was estimated for a whole 3D background field by polynomial fitting using robust regression analysis. This estimated phase offset error was then used to correct the CSF velocity maps. The estimated error profiles were compared with those obtained using an existing 2D correction approach involving local background information near the region of interest. Results The residual standard error of the polynomial fitting against the phase offset error extracted from the measured velocities was within 0.2 cm/s. The spatial dependencies of the phase offset errors showed similar tendencies in all cases, but sufficient differences in these values were found to indicate requirement of velocity correction. Differences of the estimated errors among other correction approaches were in the order of 10−2 cm/s, and the estimated errors were in good agreement with those obtained using existing approaches. Conclusion Our method is capable of estimating the measurement error of CSF velocity maps obtained from 4D flow MRI and provides quantitatively reasonable characteristics for the main CSF profile in the cerebral aqueduct in patients with NPH.
Bibliografia:ObjectType-Article-1
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ISSN:0740-3194
1522-2594
1522-2594
DOI:10.1002/mrm.29111