Ultrafast B1 mapping with RF-prepared 3D FLASH acquisition: Correcting the bias due to T₁ -induced k-space filtering effect.

ABSTRACT:

Purpose

The traditional radiofrequency (RF)-prepared B₁ mapping technique consists of one scan with an RF preparation module for flip angle-encoding and a second scan without this module for normalizing. To reduce the T₁ -induced k-space filtering effect, this method is limited to 2D FLASH acquisition with a two-parameter method. A novel 3D RF-prepared three-parameter method for ultrafast B₁ -mapping is proposed to correct the T₁ -induced quantification bias.

Theory

The point spread function analysis of FLASH shows that the prepared longitudinal magnetization before the FLASH acquisition and the image signal obeys a linear (not proportional) relationship. The intercept of the linear function causes the quantification bias and can b

SUBMITTER: Zhu D 

PROVIDER: S-EPMC9232926 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature