-
(1)
To prospectively
evaluate the effect of heart rate,
heart
rate
variability,
and
calcification
dual-source
computed
tomography
(CT)
image
quality
and
to
prospectively
assess
diagnostic
accuracy
of
dual-source
CT
for
coronary
artery
stenosis.
by
using
invasive
coronary
angiography
as
the
reference
standard.
前瞻性评价心率、心率变异性及钙化双源计算机
< br>断层扫描成像质量的影响及对冠状动脉狭窄的
双源性冠状动脉狭窄诊断的准确性评
价。以侵入
性冠状动脉造影为参照标准。
(2)
Chest
radiography
plays an essential role in
the
diagnosis
of
thoracic
disease
and
is
the
most
frequently
performed
radiologic
examination
in
the
United
States.
Since
the
discovery
of
X
rays
more
than
a
century
ago,
advances
in
technology
have
yieled numerous improvements in
thoracic imaging.
Evolutionary progress
in film-based imaging has led
to the
development of excellent screen-film systems
specifically designed for chest
radiography.
胸部
X
线摄影中起着至关重要的作用在胸部疾病的诊
断,是最常用的影
像学检查在美国。由于发现
X
射线
的一
个多世纪前,技术的进步得到了大量的改进,在
胸部影像。电影为基础的成像的进化进展
,导致了专
门设计用于胸部放射摄影的优秀的屏幕膜系统的发
展
。
(3)although
mammography is
quite sensitive for the
detection of
breast cancer morphologic
criteria that
are
mammographically
visible
are
frequently
insufficient
for
the
differentiation
of
benign
from
malignant
mance
of
needle
aspiration
and
needle
localization
procedures
followed
by
excisional
biopsy
is
frequently
necessary
to
determine the origin of a
mammographic finding.
虽然摄影是乳腺癌的形态学标准,
乳房可见检测相当
敏感,经常不足的恶性病变良性分化性能。穿刺针定
< br>位切除活检程序经常需要确定一个
X
线发现的起源
p>
(
4)Therefore
,initia
tives
have
been
taken
among
radiation
protection
authorities
to
give
priority
to
investigations
of
dose
levels
and
frequencies
of
X-ray
examinations
among
children.
The
main
objective
is
to
establish
recommendation
of
upper
dose
limits for various diagnostic procedures and to
implement
minimum
requirements
for
equipment
standards.
因此,在辐射防护当局之间采取了主动行动,优先考
虑儿童的剂量水平和频率的调查。主要目标是建立各
种诊断程序的上限的
建议,并实施设备标准的最低要
求。
(5)Thus
,
the
aim
of
our
study
was
to
prospectively
evaluate to
what extent image quality in 16-detector
row
CT
coronary
angiography
is
a
function
of
the
heart rate and image reconstruction
technique.
因此,我们的研究的目的是前瞻性评
估在何种程度上
的图像质量在
16
检测
器行冠状动脉造影是一个功能
的心脏速率和图像重建技术。
(6)The
aim
of
our
study
was
to
prospectively
evaluate the
effect of heart rate, heart rate variability,
and
calcification
on
dual-source
CT
image
quality
and
to prospectively assess the diagnostic accuracy
of
dual-source
CT
for
coronary
artery
stenosis
,
by
using invasive coronary
angiography as the reference standard.
本研究的目的是前瞻性评估心脏心率、心率变异性和
钙化对双源的图像质量的影响,并前瞻性评估冠状动
脉狭窄的双源断层扫
描的诊断准确率,通过使用侵入
性冠状动脉血管造影作为参考标准。
(7)The
purpose
of
this
study
was
to
compare
observer
performance
for
the
detection
of
urinary
system
calculi
using
computed
radiographs
with
different
display
formats
and
different
viewing
systems.
本研究的目的是比较的观察员性能检测泌尿系统结石
的
CT
片有不同的显示格式和不同观测系统。
(8)CT
studies
were
performed
with
a
dual-
source
scanner
in
all
patients
and
were
performed
without
to
acquisition
of
the
topogram,
patients received a single dose of
2.5mg of idodine.
.
CT
检查与所有患者双源扫描仪进行,
无并发症。
对像<
/p>
收购之前,患者接受单剂量
2.5mg
的
碘。
(
10)The
degree
of
correlation
between
multi-detector
row
CT
coronary
angiography
and
invasive
coronary
angiography
in
grading
of
coronary
atherosclerosis
was
investigated
with
Spearman
correlation
analysis.
The
symmetry
of
data
distribution
and
any
underestimation
or
overestimation
with
multi-detector
row
CT
coronary
angiography were checked with the
Bowker test.
多排螺旋
CT
冠状动脉造影和冠状动脉造影冠状动脉
评分之间的相关程
度进行
Spearman
相关分析研究。
数据分布和任何低估或高估与多排
CT
冠状动脉成像
的对称性与对称性检查。
(11)The
quality
of
the
images
obtained
with
the
digital
flat-panel
detector
system
was
rated
significantly superior to the quality
of those obtained
with
the
conventional
film-screen
radiography
system .
与数字的平板探测器系统获得的图像的质量被评为显
着优于那些获得与传统的电影屏幕摄影系统的质量。
(12)
In
conclusion
,
our
results
indicate
that
in
16-row
detector
cardiac
CT,
image
quality
critically
depends
on
the
choice
of
a
suited
reconstruction
interval
and
reconstruction
technique.
In
patients
with
a
high
heart
rate,
the
best
image
quality
is
observed
in
end
systole
and
early
diastole
;
in
patients
with
a
lower
heart
rate,
the
best
image
quality is observed in middiastole.
总之,
我们的研究结果表明,
在
16
排探测器心脏断层,
< br>图像质量的关键取决于一个合适的重建间隔和重建技
术的选择。在患者的高心率、
图像质量最好的是在收
缩末期和舒张早期观察;患者心率较低,图像质量最
好的是观察舒张中期。
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