Flip Angle Errors in Actual Flip Angle Imaging Using Polyvinylpyrrolidone/Water-Based Phantoms.

ABSTRACT:

Purpose

The aim of this work is to report and investigate unexpected errors in actual flip angle imaging (AFI) applied to phantom fillings based on polyvinylpyrrolidone (PVP).

Methods

Flip angle maps of PVP/water mixtures with different PVP ratios were acquired at 3 T and 7 T using a 3D cartesian AFI. The influence of spoiling was investigated by varying the RF-spoiling phase increment Φ₀ for different settings of the spoiling gradient moments. The results were compared with a reference method and EPG simulations. AFI measurements with varying TE were carried out to investigate non-spoiling-related errors. Furthermore, ¹H-NMR spectroscopy was performed on PVP samples.

Results

Measurements reveal spoiling curves of PVP/water mixtures that lack the

SUBMITTER: Himburg N 

PROVIDER: S-EPMC12746354 | biostudies-literature | 2026 Mar

REPOSITORIES: biostudies-literature