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Assessing image artifacts from radiotherapy electromagnetic transponders with metal-artifact reduction imaging.

Abstract：

:Image artifacts due to 14 gauge radiotherapy electromagnetic (EM) transponders were assessed on conventional spin echo images, and corrected using metal artifact reduction techniques: high bandwidth, view angle tilting (VAT), and slice encoding for metal artifact correction (SEMAC). Large areas of signal loss and/or pile-up were produced in an area extending up to 15.3 mm in radius for 14G transponders in standard imaging. Using high bandwidth imaging with VAT, in-plane artifact sizes were reduced by up to 35%. SEMAC did not significantly reduce in-plane or through plane artifact size for axially oriented images, but was effective in reducing through-plane artifacts for sagittal images. Using the experimental data, magnetic field maps were simulated so that the magnetic susceptibility of the transponder could be estimated and slice profiles could be visualized. Due to the large susceptibilities involved, current correction techniques are unable to fully correct artifacts due to EM transponders and significant areas of signal loss and distortion remain. Care should be taken when planning MRI following EM transponder implantation.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Bergen RV,Ryner L

doi

10.1016/j.mri.2019.02.005

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

137-142

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(18)30590-3

journal_volume

59

pub_type

杂志文章

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