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• W3123287462 startingPage "3281" @default.
• W3123287462 abstract "CEST provides a MR contrast mechanism sensitizing to the exchange between dilute labile and bulk water protons. However, the CEST effect depends on the RF saturation duration and relaxation delay, which need to be long to reach its steady state. Our study aims to estimate the QUAsi-Steady State (QUASS) CEST signal from experiments with shorter saturation and relaxation delay times.The evolution of the CEST signal was modeled as a function of the bulk water longitudinal relaxation rate during the relaxation delay (Td) and spin-lock relaxation rate during the RF saturation (Ts), from which the QUASS CEST effect is solved. Numeric simulations were programmed to compare the apparent CEST and QUASS CEST effects as a function of Ts and Td times. We also performed CEST MRI experiments from a creatine-gel pH phantom under serially varied Ts and Td times.The numeric simulation showed that although the apparent CEST effect depends on Td and Ts, the QUASS CEST solution has little dependence. Phantom results showed that the routine CEST pH contrast could be described by a nonlinear regression model (ie, ΔCESTR=ΔCESTReqapp1-e-R1ρapp·t ). We had ΔCESTReqapp = 3.90±0.03% (P < 5e-8) and R1ρapp=0.62±0.02s-1 (P < 5e-6). For the QUASS CEST analysis, we modeled the pH contrast as ΔCESTR=ΔCESTReqQUASS+s·t , using a linear regression model. We had ΔCESTReqQUASS=3.63±0.01% (P < 5e-9) and s=-0.02±0.00%/s (P < 0.01), the slope of which is minimal.The QUASS CEST algorithm provides a post-processing solution that facilitates robust CEST measurement." @default.
• W3123287462 created "2021-02-01" @default.
• W3123287462 creator A5060043482 @default.
• W3123287462 date "2021-01-23" @default.
• W3123287462 modified "2023-09-27" @default.
• W3123287462 title "Quasi‐steady state chemical exchange saturation transfer (QUASS CEST) analysis—correction of the finite relaxation delay and saturation time for robust CEST measurement" @default.
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• W3123287462 doi "https://doi.org/10.1002/mrm.28653" @default.
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• W3123287462 hasPublicationYear "2021" @default.
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