Heating of hip joint implants in MRI: The combined effect of RF and switched-gradient fields.

ABSTRACT:

Purpose

To investigate how the simultaneous exposure to gradient and RF fields affects the temperature rise in patients with a metallic hip prosthesis during an MRI session.

Methods

In silico analysis was performed with an anatomically realistic human model with CoCrMo hip implant in 12 imaging positions. The analysis was performed at 1.5 T and 3 T, considering four clinical sequences: turbo spin-echo, EPI, gradient-echo, and true fast imaging sequence with steady precession. The exposure to gradient and RF fields was evaluated separately and superposed, by adopting an ad hoc computational algorithm. Temperature increase within the body, rather than specific absorption rate, was used as a safety metric.

Results

With the exception of gradient-echo, all investigated seq

SUBMITTER: Arduino A 

PROVIDER: S-EPMC7986841 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature