Scalable spokes pTx pulses for 2D turbo-spin-echo imaging at 7 T.

ABSTRACT:

Purpose

Turbo spin echo (TSE) is important clinically. Unfortunately, 7 T TSE suffers from B₁ ⁺-induced signal dropouts. Magnitude-based parallel transmit (pTx) pulse design algorithms cannot enforce phase patterns complying with the Carr-Purcell-Meiboom-Gill conditions (90° phase shift between excitation and refocusing). We introduce scalable spokes pTx pulses for 7 T TSE imaging.

Theory

We define scalable spokes pulses as having time-symmetric RF waveforms, antisymmetric in-plane gradients, and rephased subpulse slice-selection gradients. They produce flip angles that are approximately proportional to the applied voltage with voltage-independent phase patterns.

Methods

Scalable spokes pulses were designed for a phantom. Scaling behavior was cha

SUBMITTER: Zhang M 

PROVIDER: S-EPMC12681301 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature