Complex B₁ ⁺ mapping with Carr-Purcell spin echoes and its application to electrical properties tomography.

ABSTRACT:

Purpose

To present a new complex-valued B₁ ⁺ mapping method for electrical properties tomography using Carr-Purcell spin echoes.

Methods

A Carr-Purcell (CP) echo train generates pronounced flip-angle dependent oscillations that can be used to estimate the magnitude of B₁ ⁺ . To this end, a dictionary is used that takes into account the slice profile as well as T₂ relaxation along the echo train. For validation, the retrieved B₁ ⁺ map is compared with the actual flip angle imaging (AFI) method in a phantom (79 ε₀ , 0.34 S/m). Moreover, the phase of the first echo reflects the transceive phase. Overall, the CP echo train yields an estimate of the complex-valued B₁ ⁺ ,

SUBMITTER: Iyyakkunnel S 

PROVIDER: S-EPMC9298742 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature