Deep-learning-based separation of shallow and deep layer blood flow rates in diffuse correlation spectroscopy
Mikie Nakabayashi,
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Siwei Liu,
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Nawara Mahmood Broti
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et al.
Biomedical Optics Express,
Journal Year:
2023,
Volume and Issue:
14(10), P. 5358 - 5358
Published: Sept. 13, 2023
Diffuse
correlation
spectroscopy
faces
challenges
concerning
the
contamination
of
cutaneous
and
deep
tissue
blood
flow.
We
propose
a
long
short-term
memory
network
to
directly
quantify
flow
rates
shallow
deep-layer
tissues.
By
exploiting
different
contributions
auto-correlation
functions,
we
accurately
predict
(RMSE
=
0.047
0.034
ml/min/100
g
simulated
tissue,
R2
0.99
0.99,
respectively)
in
two-layer
phantom
experiment.
This
approach
is
useful
evaluating
responses
active
muscles,
where
both
deep-muscle
increase
with
exercise.
Language: Английский
Differential changes in blood flow and oxygen utilization in active muscles between voluntary exercise and electrical muscle stimulation in young adults
Makoto Katagiri,
No information about this author
Mikie Nakabayashi,
No information about this author
Yasuhiro Matsuda
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et al.
Journal of Applied Physiology,
Journal Year:
2024,
Volume and Issue:
136(5), P. 1053 - 1064
Published: March 14, 2024
The
physiological
effects
on
blood
flow
and
oxygen
utilization
in
active
muscles
during
after
involuntary
contraction
triggered
by
electrical
muscle
stimulation
(EMS)
remain
unclear,
particularly
compared
with
those
elicited
voluntary
(VOL)
contractions.
Therefore,
we
used
diffuse
correlation
near-infrared
spectroscopy
(DCS-NIRS)
to
compare
changes
local
consumption
these
two
types
of
contractions
humans.
Overall,
24
healthy
young
adults
participated
the
study,
data
were
successfully
obtained
from
17
them.
Intermittent
(2-s
contraction,
2-s
relaxation)
isometric
ankle
dorsiflexion
a
target
tension
20%
maximal
VOL
was
performed
EMS
or
for
2
min,
followed
6-min
recovery
period.
DCS-NIRS
probes
placed
tibialis
anterior
muscle,
relative
tissue
index
(rBFI),
extraction
fraction
(rOEF),
metabolic
rate
(rMRO
Language: Английский
DCS blood flow index underestimates skeletal muscle perfusion in vivo: rationale and early evidence for the NIRS-DCS perfusion index
Journal of Biomedical Optics,
Journal Year:
2024,
Volume and Issue:
29(02)
Published: Feb. 6, 2024
Diffuse
correlation
spectroscopy
(DCS)
permits
non-invasive
assessment
of
skeletal
muscle
blood
flow
but
may
misestimate
changes
in
perfusion.
Language: Английский
Measurements of in vivo skeletal muscle oxidative capacity are lower following sustained isometric compared with dynamic contractions
Applied Physiology Nutrition and Metabolism,
Journal Year:
2023,
Volume and Issue:
49(2), P. 250 - 264
Published: Oct. 31, 2023
Human
skeletal
muscle
oxidative
capacity
can
be
quantified
non-invasively
using
31-phosphorus
magnetic
resonance
spectroscopy
(
Language: Английский