MR thermometry with high precision and temporal resolution by quadratic phase MR fingerprinting.

ABSTRACT:

Purpose

To map temperature via the proton resonance frequency- (PRF-) shift with a high frame rate and high precision using quadratic RF excitation phase-magnetic resonance fingerprinting (qRF-MRF).

Methods

A continuous balanced qRF-MRF sequence was implemented using a constant low-flip-angle excitation with quadratic RF excitation phase increments, which impart sensitivity to resonance frequency changes from heating by repeatedly sweeping the sequence's resonance frequency between -1$$ -1 $$ /(2TR) and +1/(2TR) Hz, while minimizing sensitivity to T1$$ {T}_1 $$ and T2$$ {T}_2 $$ . Temperature maps were reconstructed from sliding windows using the conjugate gradient (CG) algorithm, dictionary matching, and conventional PRF temperature calculations using MRF-synthesized gradie

SUBMITTER: Garrow SJ 

PROVIDER: S-EPMC12202739 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature