Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Open-bore vertical MRI scanners generate significantly less RF heating
  around deep brain stimulation leads compared to horizontal scanners   Objectives Studies that assess magnetic resonance imaging (MRI) induced
radiofrequency (RF) heating of the tissue in the presence of an active
electronic implant are mostly performed in horizontal, closed-bore scanners.
Vertical, open-bore MRI systems have a 90{\deg} rotated magnet and generate a
fundamentally different RF field distribution in the body, yet little is known
about the RF heating of deep brain stimulation (DBS) systems in this class of
scanners. Here, we investigated whether RF heating of DBS devices was
significantly different in a vertical, open-bore MRI scanner compared to a
horizontal, closed-bore MRI scanner. Materials and Methods In this phantom
study, RF heating around the lead of a commercial DBS system implanted in an
anthropomorphic phantom was evaluated in a 1.2 T vertical open-bore scanner
(Oasis, Fujifilm Healthcare) and a 1.5 T horizontal closed-bore scanner (Aera,
Siemens Healthineers). DBS devices were implanted following 30 realistic lead
trajectories. Electromagnetic simulations were performed to assess the specific
absorption rate (SAR) of RF energy around leads with different internal
structures. Results When controlling for B1+rms, temperature increase around
the lead-tip was significantly lower at the vertical scanner compared to the
horizontal scanner (p-value=9.1x10-7). Electromagnetic simulations demonstrated
up to a 14-fold reduction in the maximum 0.1g-averaged SAR deposited in the
tissue surrounding the lead-tip in a vertical scanner compared to a horizontal
scanner for leads with straight and helical internal wires. Conclusions RF
experiments and electromagnetic simulations demonstrated consistently lower RF
heating and power deposition around the DBS lead-tip at the vertical scanner
compared to the horizontal scanner. Our simulation results suggest that this
trend in heating may potentially extend to leads from other manufacturers.

24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio