Physics in Medicine and Biology,
Год журнала:
2024,
Номер
69(11), С. 115029 - 115029
Опубликована: Апрель 22, 2024
.
Photon-counting
detector
(PCD)
CT
enables
routine
virtual-monoenergetic
image
(VMI)
reconstruction.
We
evaluated
the
performance
of
an
automatic
VMI
energy
level
(keV)
selection
tool
on
a
clinical
PCD-CT
system
in
comparison
to
tube
potential
(kV)
from
energy-integrating-detector
(EID)
same
manufacturer.
Journal of Applied Clinical Medical Physics,
Год журнала:
2024,
Номер
25(4)
Опубликована: Фев. 22, 2024
The
aim
of
this
study
was
to
characterize
a
second-generation
wide-detector
dual-layer
spectral
computed
tomography
(CT)
system
for
material
quantification
accuracy,
acquisition
parameter
and
patient
size
dependencies,
tissue
characterization
capabilities.
Background
Data
on
the
diagnostic
accuracy
of
ultralow-dose
(ULD)
CT
protocols
for
periodic
surveillance
in
recipients
lung
transplant
are
lacking.
Purpose
To
assess
potential
radiation
dose
reduction
using
ULD
photon-counting
(PCT)
to
detect
abnormalities
during
repeat
follow-up.
Materials
and
Methods
Consecutive
adult
undergoing
same-day
standard-of-care
low-dose
(LD)
PCT
from
March
2023
May
were
prospectively
included.
The
performed
with
two
target
effective
doses
comprising
20%
(hereafter,
ULD1)
10%
ULD2)
standard
LD
protocol.
1-mm
reconstructions
reviewed
by
three
readers.
Subjective
image
quality,
visibility
certain
anatomic
structures
(using
a
five-point
Likert
scale),
presence
independently
assessed.
χ
Journal of Applied Clinical Medical Physics,
Год журнала:
2023,
Номер
24(8)
Опубликована: Июнь 30, 2023
Abstract
Photon‐counting
computed
tomography
(PCCT)
systems
are
increasingly
available
in
the
U.S.
following
Food
and
Drug
Administration
(FDA)
approval
of
first
clinical
PCCT
system
Fall
2021.
Consequently,
there
will
be
a
need
to
incorporate
PCCTs
into
existing
fleets
traditional
CT
systems.
The
commissioning
process
was
devised
by
evaluating
degree
agreement
between
performance
that
established
A
(Siemens
NAEOTOM
Alpha)
evaluated
using
American
College
Radiology(ACR)
phantom
(Gammex
464).
scanned
on
3rd
Generation
EID
Force)
at
three
dose
levels.
Images
were
reconstructed
across
range
reconstruction
kernels
Iterative
Reconstruction
(IR)
strengths.
Two
image
quality
metrics—spatial
resolution
noise
texture—were
calculated
AAPM
TG233
software
(imQuest),
as
well
metric
achieve
target
magnitude
10
HU.
For
each
pair
EID‐PCCT
kernel/IR
strengths,
difference
metrics
calculated,
weighted,
multiplied
over
all
determine
concordance
IR
characterized
comparing
relative
texture
reference
function
strength
for
system.
In
general,
kernel
“sharpness”
increased
system,
spatial
resolution,
frequency,
increased.
given
kernel,
showed
higher
compared
standard
mode.
implementation
better
preserved
strengths
EID,
demonstrated
respective
20
7%
shifts
from
“Off”
“Max.”
Overall,
closest
match
identified
with
1
step
1–2
steps.
Substantial
reduction
potential
up
70%
found
when
targeting
constant
magnitude.
Scientific Reports,
Год журнала:
2023,
Номер
13(1)
Опубликована: Сен. 9, 2023
We
evaluate
stability
of
spectral
results
at
different
heart
rates,
acquisition
modes,
and
cardiac
phases
in
first-generation
clinical
dual-source
photon-counting
CT
(PCCT).
A
motion
simulator
with
a
coronary
stenosis
mimicking
50%
eccentric
calcium
plaque
was
scanned
five
rates
(0,
60-100
bpm)
the
three
available
scan
modes
(high
pitch
prospectively
ECG-triggered
spiral,
axial,
retrospectively
ECG-gated
spiral).
Subsequently,
full
width
half
max
(FWHM)
stenosis,
Dice
score
(DSC)
for
stenosed
region,
eccentricity
non-stenosed
region
were
calculated
virtual
monoenergetic
images
(VMI)
50,
70,
150
keV
iodine
density
maps
both
diastole
systole.
FWHM
averaged
differences
-
0.20,
0.28,
0.15
mm
relative
to
static
VMI
across
parameters
high
spiral
scans,
respectively.
Additionally,
there
no
effect
rate
mode
on
(p-values
<
0.001).
DSC
demonstrated
similarity
among
standard
deviations
0.08,
0.09,
0.11,
0.08
keV,
maps,
respectively,
insignificant
0.01).
Similarly,
illustrated
small
each
result.
Consistency
phase
demonstrates
added
benefit
from
PCCT
further
increase
confidence
quantification
advance
cardiovascular
diagnostics.
Physics in Medicine and Biology,
Год журнала:
2024,
Номер
69(5), С. 055001 - 055001
Опубликована: Фев. 2, 2024
Abstract
Objective.
Computed
tomography
(CT)
has
advanced
since
its
inception,
with
breakthroughs
such
as
dual-energy
CT
(DECT),
which
extracts
additional
information
by
acquiring
two
sets
of
data
at
different
energies.
As
high-flux
photon-counting
detectors
(PCDs)
become
available,
PCD-CT
is
also
becoming
a
reality.
can
acquire
multi-energy
in
single
scan
spectrally
binning
the
incident
x-ray
beam.
With
this,
K-edge
imaging
becomes
possible,
allowing
high
atomic
number
(high-Z)
contrast
materials
to
be
distinguished
and
quantified.
In
this
study,
we
demonstrated
that
DECT
methods
converted
systems
extending
method
Bourque
et
al
(2014).
We
optimized
energy
bins
PCD
for
purpose
expanded
capabilities
employing
subtraction
separate
high-atomic
material.
Approach.
The
decomposes
into
their
effective
(
Z
eff
)
electron
density
relative
water
ρ
e
).
model
was
calibrated
evaluated
using
tissue-equivalent
from
RMI
Gammex
phantom
known
values
elemental
compositions.
Theoretical
were
found
appropriate
ranges
composition
materials.
varied
slightly
but
considered
systematic
error.
An
ex
vivo
bovine
tissue
sample
decomposed
evaluate
further
injected
gold
chloride
demonstrate
separation
agent.
Main
results.
mean
root
squared
percent
errors
on
extracted
0.76%
0.72%,
respectively
1.77%
1.98%
DECT.
types
correctly
identified
after
decomposition.
Additionally,
separated
imaging.
Significance.
offers
ability
employ
material
decomposition
methods,
along
providing
Diagnostics,
Год журнала:
2024,
Номер
14(12), С. 1223 - 1223
Опубликована: Июнь 11, 2024
The
field
of
computed
tomography
(CT),
which
is
a
basic
diagnostic
tool
in
clinical
practice,
has
recently
undergone
rapid
technological
advances.
These
include
the
evolution
dual-energy
CT
(DECT)
and
development
photon-counting
(PCCT).
DECT
enables
acquisition
images
at
two
different
energy
spectra,
allows
for
differentiation
certain
materials,
mainly
calcium
iodine.
PCCT
recent
technology
that
scanner
to
quantify
each
photon
gathered
by
detector.
This
method
gives
possibility
decrease
radiation
dose
increase
spatial
temporal
resolutions
scans.
Both
these
techniques
have
found
wide
range
applications
radiology,
including
vascular
studies.
In
this
narrative
review,
authors
present
principles
PCCT,
outline
their
advantages
drawbacks,
briefly
discuss
application
methods
radiology.
Korean Journal of Radiology,
Год журнала:
2024,
Номер
25(7), С. 662 - 662
Опубликована: Янв. 1, 2024
Since
the
emergence
of
first
photon-counting
computed
tomography
(PCCT)
system
in
late
2021,
its
advantages
and
a
wide
range
applications
all
fields
radiology
have
been
demonstrated.
Compared
to
standard
energy-integrating
detector-CT,
PCCT
allows
for
superior
geometric
dose
efficiency
every
examination.
While
this
aspect
by
itself
is
groundbreaking,
do
not
stop
there.
facilitates
an
unprecedented
combination
ultra-high-resolution
imaging
without
penalty
or
field-of-view
restrictions,
detector-based
elimination
electronic
noise,
ubiquitous
multi-energy
spectral
information.
Considering
high
demands
orthopedic
visualization
minuscule
details
while
simultaneously
covering
large
portions
skeletal
soft
tissue
anatomy,
no
subspecialty
may
benefit
more
from
novel
detector
technology
than
musculoskeletal
radiology.
Deeply
rooted
experimental
clinical
research,
review
article
aims
provide
introduction
cosmos
PCCT,
explain
technical
basics,
highlight
most
promising
patient
care,
also
mentioning
current
limitations
that
need
be
overcome.
Medical Physics,
Год журнала:
2024,
Номер
51(11), С. 8034 - 8046
Опубликована: Сен. 5, 2024
The
first
commercially
available
photon-counting-detector
CT
(PCD-CT)
has
been
introduced
for
clinical
use.
However,
its
spectral
performance
on
single-
and
dual-contrast
imaging
tasks
not
comprehensively
assessed.
European Radiology Experimental,
Год журнала:
2025,
Номер
9(1)
Опубликована: Янв. 2, 2025
Abstract
Background
Photon-counting
detector
(PCD)
technology
has
the
potential
to
reduce
noise
in
computed
tomography
(CT).
This
study
aimed
carry
out
a
voxelwise
characterization
for
clinical
PCD-CT
scanner
with
model-based
iterative
reconstruction
algorithm
(QIR).
Methods
Forty
repeated
axial
acquisitions
(tube
voltage
120
kV,
tube
load
200
mAs,
slice
thickness
0.4
mm)
of
homogeneous
water
phantom
and
CTP404
module
(Catphan-504)
were
performed.
Water
also
performed
on
conventional
energy-integrating
(EID)
sinogram/image-based
algorithm,
using
similar
acquisition/reconstruction
parameters.
For
smooth/sharp
kernels,
filtered
back
projection
(FBP)-
iterative-reconstructed
images
obtained.
Noise
maps,
non-uniformity
index
(NUI)
image
histograms,
power
spectrum
(NPS)
curves
computed.
Results
FBP-reconstructed
phantom,
mean
was
(smooth/sharp
kernel)
11.7
HU/51.1
HU
18.3
HU/80.1
PCD-scanner
EID-scanner,
respectively,
NUI
values
less
than
half
those
EID-scanner.
Percentage
reduction
increased
increasing
power,
up
57.7%/72.5%
56.3%/70.1%
respectively.
PCD-scanner,
FBP-
QIR-reconstructed
featured
an
almost
Gaussian
distribution
values,
whose
shape
did
not
appreciably
vary
power.
maps
showed
15.7%/9.2%.
limited
low-frequency
shift
NPS
peak
frequency.
Conclusion
allowed
reducing
while
improving
its
spatial
uniformity.
QIR
decreases
without
modifying
histogram
shape,
partly
preserving
texture.
Relevance
statement
corroborates
capability
photon-counting
CT
imaging
uniformity
yielding
radiation
exposure,
though
this
needs
be
assessed
more
detail.
Key
Points
First
technology.
improve
values.
In
CT,
(QIR)
allows
decreasing
effectively
noise.
is
done
limiting
Graphical