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This is a Quantitative Study study.

October 20, 2025Open Access

Optimization of Pulsed Saturation Transfer MR Fingerprinting (ST MRF) Acquisition Using the Cramér–Rao Bound and Sequential Quadratic Programming

Puntos clave

The proposed optimization approach significantly improved agreement with reference values in vivo.
Results showed an 8% lower NRMSE and a 15% higher Pearson's r value, demonstrating effective optimization.
Validation was conducted using L-arginine phantoms and healthy human volunteers scanned at 3T.
Approach combines Cramér–Rao bound with numerical methods to optimize acquisition time and image quality.

Resumen

ABSTRACT Purpose To develop a method for optimizing pulsed saturation transfer MR fingerprinting (ST MRF) acquisition. Methods The Cramér–Rao bound (CRB) for variance assessment was employed on Bloch–McConnell‐based simulated signals, followed by a numerical sequential quadratic programming optimization and basin‐hopping avoidance of local minima. Validation was performed using L‐arginine phantoms and healthy human volunteers at 3T while restricting the scan time to be less than 40 s. Results The proposed optimization approach resulted in a significantly improved agreement with reference standard values in vivo, compared to baseline non‐optimized protocols (8% lower NRMSE, 7% higher SSIM, and 15% higher Pearson's r value, ). Conclusion The combination of the CRB with sequential quadratic programming and a rapid Bloch–McConnell simulator offers a means for optimizing and accelerating pulsed CEST and semisolid magnetization transfer (MT) MRF acquisition.

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