10.6084/m9.figshare.5107552.v1
Markowitz D.
Markowitz
D.
Lin D.
Lin
D.
Salas S.
Salas
S.
Kohn N.
Kohn
N.
Schulder M.
Schulder
M.
Supplementary Material for: Compact Intraoperative MRI: Stereotactic Accuracy and Future Directions
Karger Publishers
2017
PoleStar
Intraoperative MRI
Stereotactic accuracy
2017-06-14 13:55:10
Journal contribution
https://karger.figshare.com/articles/journal_contribution/Supplementary_Material_for_Compact_Intraoperative_MRI_Stereotactic_Accuracy_and_Future_Directions/5107552
<p><b><i>Background:</i></b> Intraoperative imaging must supply data
that can be used for accurate stereotactic navigation. This information
should be at least as accurate as that acquired from diagnostic imagers.
<b><i>Objectives:</i></b> The aim of this study was to compare the
stereotactic accuracy of an updated compact intraoperative MRI (iMRI)
device based on a 0.15-T magnet to standard surgical navigation on a
1.5-T diagnostic scan MRI and to navigation with an earlier model of the
same system. <b><i>Methods:</i></b> The accuracy of each system was
assessed using a water-filled phantom model of the brain. Data collected
with the new system were compared to those obtained in a previous study
assessing the older system. The accuracy of the new iMRI was measured
against standard surgical navigation on a 1.5-T MRI using T1-weighted
(W) images. <b><i>Results:</i></b> The mean error with the iMRI using
T1W images was lower than that based on images from the 1.5-T scan (1.24
vs. 2.43 mm). T2W images from the newer iMRI yielded a lower navigation
error than those acquired with the prior model (1.28 vs. 3.15 mm). <b><i>Conclusions:</i></b>
Improvements in magnet design can yield progressive increases in
accuracy, validating the concept of compact, low-field iMRI. Avoiding
the need for registration between image and surgical space increases
navigation accuracy.</p>