NMR in Biomedicine,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 17, 2024
Tissue-mimicking
reference
phantoms
are
indispensable
for
the
development
and
optimization
of
magnetic
resonance
(MR)
measurement
sequences.
Phantoms
have
greatest
utility
when
they
mimic
MR
signals
arising
from
tissue
physiology;
however,
many
properties
underlying
these
signals,
including
relaxation
characteristics,
can
vary
as
a
function
field
strength.
There
has
been
renewed
interest
in
imaging
(MRI)
at
strengths
less
than
1
T,
developed
higher
may
not
be
physiologically
relevant
lower
fields.
This
work
focuses
on
developing
materials
with
specific
strengths.
Specifically,
we
recipes
that
used
to
create
synthetic
samples
target
nuclear
values
fields
between
0.0065
0.55
T.
Magnetic Resonance in Medicine,
Journal Year:
2024,
Volume and Issue:
92(3), P. 1011 - 1021
Published: April 16, 2024
Abstract
Purpose
Demonstrate
the
potential
of
spatiotemporal
encoding
(SPEN)
MRI
to
deliver
largely
undistorted
2D,
3D,
and
diffusion
weighted
images
on
a
110
mT
portable
system.
Methods
SPEN's
quadratic
phase
modulation
was
used
subsample
low‐bandwidth
dimension
echo
planar
acquisitions,
delivering
alias‐free
with
an
enhanced
immunity
image
distortions
in
laboratory‐built,
low‐field,
system
lacking
multiple
receivers.
Results
Healthy
brain
different
SPEN
time‐bandwidth
products
subsampling
factors
were
collected.
These
compared
favorably
EPI
acquisitions
including
topup
corrections.
Robust
3D
diagnostic
value
demonstrated,
2.5
mm
isotropic
resolutions
achieved
3
min
scans.
This
performance
took
advantage
low
specific
absorption
rate
relative
long
TEs
associated
low‐field
MRI.
Conclusion
provides
robust
advantageous
fast
acquisition
approach
obtain
faithful
DWI
data
low‐cost,
portable,
systems
without
parallel
acceleration.
Medical Devices Evidence and Research,
Journal Year:
2025,
Volume and Issue:
Volume 18, P. 107 - 121
Published: Feb. 1, 2025
The
burden
of
neurological
disorders
in
low-
and
middle-income
countries
(LMICs)
may
be
underestimated
due
to
the
limited
number
diagnostic
imaging
devices
trained
specialists
operate
interpret
scans.
Recent
advancements
low-field
(<100
milliteslas)
magnetic
resonance
(LFMRI)
hold
significant
promise
for
improving
access
pediatric
neuroimaging
technology's
lower
costs,
portability,
reduced
infrastructure
training
requirements.
Explore
user
needs
experiences
on
use
a
portable
LFMRI
LMICs.
We
conducted
qualitative
interviews
with
end
users
systems
across
11
sites
Bangladesh,
Ethiopia,
Ghana,
Malawi,
Pakistan,
South
Africa,
Uganda,
Zambia.
A
semi-structured
questionnaire
open-ended
questions
usability
feasibility
was
used
encourage
participants
share
their
opinions
ease
use,
satisfaction,
integration
into
local
health
systems.
Among
46
participants,
key
challenges
were
reported
infant
positioning,
power
stability,
internet
connectivity.
Suggestions
included
developing
reference
materials
content
format
tailored
contexts,
conducting
refresher
trainings,
providing
education
that
includes
technical
maintenance
support
crucial
appropriate
utilization
implementation
sustainability.
This
study
underscores
importance
incorporating
human-centered
design
principles
feedback
identifying
resolving
issues,
sharing
insights
successful
within
existing
care
infrastructures
LMICs,
optimizing
populations.
Journal of Medical Imaging,
Journal Year:
2025,
Volume and Issue:
12(05)
Published: April 11, 2025
Objective
image
quality
metrics
(IQMs)
are
widely
used
as
outcome
measures
to
assess
acquisition
and
reconstruction
strategies
for
diagnostic
images.
For
nonpathological
magnetic
resonance
(MR)
images,
these
IQMs
correlate
varying
degrees
with
expert
radiologists'
confidence
scores
of
overall
perceived
quality.
However,
it
is
unclear
whether
also
task-specific
or
in
performing
a
specific
task,
which
calls
into
question
their
use
surrogates
radiologist
opinion.
0.5
T
MR
images
from
16
stroke
patients
two
healthy
volunteers
were
retrospectively
undersampled
(
R=1
7×
)
reconstructed
via
compressed
sensing.
Three
neuroradiologists
reported
the
presence/absence
acute
ischemic
(AIS)
assigned
Fazekas
score
describing
extent
chronic
lesion
burden.
Neuroradiologists
ranked
each
task
using
1
5
Likert
scale.
Confidence
correlated
noise
measure,
visual
information
fidelity
criterion,
feature
similarity
index,
root
mean
square
error,
structural
(SSIM)
nonlinear
regression
modeling.
Although
acceleration
alters
quality,
remain
able
report
pathology.
All
tested
some
degree
assessing
burden,
but
none
diagnosing
AIS
due
consistent
performance
regardless
degradation.
Accelerated
helpful
understanding
ability
context
although
not
case
diagnosis.
These
findings
suggest
that
commonly
IQMs,
such
SSIM
do
necessarily
indicate
an
image's
utility
when
certain
tasks.
Investigative Radiology,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 16, 2025
Abstract
The
past
decade
has
witnessed
notable
advancements
in
clinical
neuroimaging
facilitated
by
technological
innovations
and
significant
scientific
discoveries.
In
conjunction
with
Investigative
Radiology
's
60th
anniversary,
this
review
examines
key
contributions
from
the
10
years,
emphasizing
journal's
most
accessed
articles
their
impact
on
practice
research.
Advances
imaging
technologies,
including
photon-counting
computed
tomography,
low-field
high-field
magnetic
resonance
systems
have
expanded
diagnostic
capabilities.
Progress
development
translation
of
contrast
media
rapid
quantitative
techniques
further
improved
accuracy.
Additionally,
integration
advanced
data
analysis
methods,
particularly
deep
learning
medical
informatics,
image
interpretation
operational
efficiency.
Beyond
developments,
highlights
basic
neuroscience
findings,
such
as
discovery
characterization
glymphatic
system.
These
insights
provided
a
deeper
understanding
central
nervous
system
physiology
pathology,
bridging
gap
between
research
applications.
This
integrates
these
to
provide
an
overview
progress
ongoing
challenges
neuroimaging,
offering
into
its
current
state
potential
future
directions
within
broader
field
radiology.
medRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 31, 2024
Low-field
open
magnetic
resonance
imaging
(MRI)
systems,
typically
operating
at
field
strengths
below
1
Tesla,
has
greatly
expanded
the
accessibility
of
MRI
technology
to
meet
a
wide
range
patient
needs.
However,
inherent
challenges
low-field
MRI,
such
as
limited
signal-to-noise
ratios
and
availability
dedicated
radiofrequency
(RF)
coils,
have
prompted
need
for
innovative
coil
designs
that
can
improve
quality
diagnostic
capabilities.
NMR in Biomedicine,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 7, 2024
Abstract
Low
magnetic
field
resonance
imaging
(MRI)
(
<
1
T)
is
regaining
interest
in
the
(MR)
community
as
a
complementary,
more
flexible,
and
cost‐effective
approach
to
MRI
diagnosis.
Yet,
impaired
signal‐to‐noise
ratio
(SNR)
per
square
root
of
time,
or
SNR
efficiency,
leading
turn
prolonged
acquisition
times,
still
challenges
its
relevance
at
clinical
level.
To
address
this,
researchers
investigate
various
hardware
software
solutions
improve
efficiency
low
field,
including
leveraging
latest
advances
computing
hardware.
However,
there
may
not
be
single
recipe
for
improving
it
key
embrace
limitations
each
proposed
solution.
In
other
words,
suitable
depend
on
final
objective
application
envisioned
low‐field
scanner
and,
importantly,
characteristics
specific
field.
this
review,
we
aim
provide
an
overview
First,
cover
techniques
efficient
k
‐space
sampling
reconstruction.
Then,
present
post‐acquisition
that
enhance
MR
images
such
denoising
super‐resolution.
addition,
summarize
recently
introduced
electromagnetic
interference
cancellation
approaches
showing
great
promises
when
operating
shielding‐free
environments.
Finally,
discuss
advantages
these
could
directions
future
applications.
