1 Ninety-eight adult patients underwent
102 helical CT examinations.
2 Since its inception in
1998,
helical CT with rectally administered contrast material
3 Thirty-seven patients underwent
50 helical CT angiographic examinations and, within 2 weeks
4 included findings from angiography (n =
55),
helical CT (n = 47), and MR imaging (n = 26).
5 A helical CT scan of the chest with 3D reconstruction was
6 The purpose of this article is to describe
a helical CT approach to imaging in children suspected of
7 tients with a cranial CT scan, obtained on
a helical CT scanner, that shows no intracerebral injury a
8 ent regions of the United States underwent
a helical CT scan and detailed questioning about drug hist
9 ation in the emergency room, after
abdominal helical CT showed findings positive for calculus and sug
10 ixty-four contrast medium-enhanced
abdominal helical CT scans (64 adult patients) were obtained with
11 Axial
and helical CT numbers did not differ substantially.
12 heart and scanned with electron-beam CT
and helical CT in horizontal and vertical planes.
13 anatomic sites; at six sites, MR imaging
and helical CT were equivalent.
14 Plain radiographs
and helical CT scans of 178 patients with acute flank pain w
15 FDG-PET scans
and helical CT scans were obtained before and after neoadjuv
16 Spirometry
and helical CT were performed in 15 patients with mild asthm
17 ine per kilogram, injected 90 minutes
apart)
helical CT.
18 appropriate correction factors are
applied,
helical CT is superior to electron-beam CT in quantifyin
19 scanners that participated in this study
are helical CT scanners (64 slices, 16 slices and dual slice
20 tained and findings correlated with those
at helical CT and endoscopic retrograde cholangiopancreatog
21 ents with documented disease underwent
axial helical CT through the upper and lower lung fields.
22 ding main arteries were identified with
both helical CT and angiography.
23 , and one perivesical space were followed
by helical CT.
24 In four-
channel helical CT, SD(r) measurements were directly proportiona
25 l CT and by a factor of 2.0 for four-
channel helical CT.
26 SD(r) by a factor of 1.6 for single-
channel helical CT and by a factor of 2.0 for four-channel helic
27 was smaller in four- than in single-
channel helical CT for any given table increment (TI).
28 ller with four- compared with single-
channel helical CT for any given TI.
29 In single-
channel helical CT, SD(r) increased linearly with beam width and
30 .0) and multiple detector-row (four-
channel)
helical CT (detector width, 1.25, 2.5, 3.75, and 5 mm; p
31 er with single detector-row (single-
channel)
helical CT (beam width, 1-10 mm; pitch, 1.0, 2.0, or 3.0
32 smokers aged 50-85 years) in the Mayo
Clinic helical CT screening study were used to populate the Lun
33 nce syndrome improves with 0.5-mm-
collimated helical CT and reformation in the SSC plane.
34 rast media and contiguous, thin-
collimation,
helical CT imaging of the right lower quadrant.
35 Five dogs each underwent five
consecutive helical CT examinations (one single-detector row CT exam
36 Conservatively,
helical CT has the potential to depict active colonic he
37 Triple-
contrast helical CT accurately demonstrates peritoneal violation
38 Conventional helical CT scans were obtained with patients in the pron
39 The
conventional helical CT, cine CT, and PET data of an axially translat
40 otocols, the data of this study
demonstrated helical CT's inherent advantage over currently commercia
41 Following stent-graft
deployment,
helical CT data were analyzed for the presence of iliac
42 readers 1, 2, and 3, respectively) than
did helical CT (45%, 36%, and 43% of patients for readers 1,
43 and insert were scanned with five
different helical CT scanners by using 1.0-1.5-mm, 2.50-3.75-mm, 5
44 The initial, low-
dose helical CT of the lungs performed in high risk individua
45 n of the upper gastrointestinal tract
during helical CT.
46 An eight-
element helical CT scanner was used to acquire data in two phant
47 derwent abdominal contrast material-
enhanced helical CT and MR imaging from 1994 through 1997.
48 1,879 consecutive contrast material-
enhanced helical CT scans identified 28 cases in which pulmonary
49 Contrast material-
enhanced helical CT was performed before TIPS creation in 25 pati
50 Results were compared for
five helical CT examinations: unenhanced CT, iohexol-enhanced
51 wever, most physicians (67%) ordered a
fixed helical CT scan and the patient was transported to the r
52 For helical CT, estimated mean fetal doses in micrograys at
53 tumor remained undetected in 13 patients
for helical CT and in six patients for MR imaging.
54 antom study, the attenuation correction
from helical CT caused a major artifactual defect in the late
55 D volume-rendered CT scans were created
from helical CT scans.
56 ient management after positive findings
from helical CT was also studied.
57 Functional helical CT can accurately demonstrate reversible airflow
58 ast were injected, and retrospectively
gated helical CT was performed for angiography and after 1.5-,
59 Hepatic helical CT was performed in 250 consecutive patients wit
60 seudoenhancement of renal cysts may occur
if helical CT is performed during peak renal enhancement.
61 he most significant changes have occurred
in helical CT.
62 Anatomic studies,
including helical CT, should be followed by diuretic MAG3-F0 scint
63 For the readers at the first
institution,
helical CT had 60% sensitivity, 81% specificity, 60% pos
64 For the readers at the second
institution,
helical CT had 53% sensitivity, 97% specificity, 89% pos
65 Major strengths of
limited helical CT with rectal contrast material include produci
66 Multidetector helical CT was performed in all patients by using a stan
67 raphic, and excretory phases),
multidetector helical CT images of 58 histologically proved and karyot
68 s-tracking and time-registered
multidetector helical CT-derived AIF (3086 + or - 941) (P = .90).
69 Radiologists reviewed
multiphase helical CT liver images in 86 patients with 37 hemangiom
70 positions) was performed with a
multisection helical CT scanner in 40 asymptomatic high-risk patients
71 tion was reduced threefold with
multisection helical CT compared with standard helical CT, and the ne
72 Patients with
negative helical CT scans were prospectively compared with patien
73 ing procedures have been replaced with
newer helical CT techniques that can be performed in less time
74 Nonenhanced helical CT and excretory urographic images in 82 patient
75 Nonenhanced helical CT is a highly accurate technique for diagnosing
76 kg) prospectively underwent both
nonenhanced helical CT (5-mm collimation; pitch of 1.5) and US of th
77 e extent of perinephric edema on
nonenhanced helical CT images can be used to predict the degree of u
78 pendicitis by using thin-section
nonenhanced helical CT.
79 The
nonenhanced helical CT scans in 82 patients with a confirmed diagnos
80 Nineteen (38%) portograms were
normal;
helical CT angiograms correctly demonstrated the absence
81 Diagnostic accuracy
of helical CT for acute appendicitis improved significantly
82 een-detected localized lung cancers, cost
of helical CT, and anxiety about indeterminate nodule diagn
83 h screening, direct-to-consumer marketing
of helical CT is not advisable.
84 Misregistration
of helical CT attenuation and PET emission images causes ar
85 m of patient characteristics, performance
of helical CT and pulmonary angiography (or an appropriate
86 Results
of helical CT angiography and portography were compared.
87 tis in the pediatric population, the role
of helical CT is far from clear.
88 the sensitivity, specificity, and safety
of helical CT for diagnosis of suspected pulmonary embolism
89 attenuation to determine the sensitivity
of helical CT for depicting active colonic bleeding.
90 The reported sensitivity
of helical CT ranged from 53% to 100%, and specificity rang
91 Sensitivity and specificity
of helical CT angiography for all morphologic abnormalities
92 Sensitivity and specificity
of helical CT angiography were separately calculated for th
93 The sensitivity and specificity
of helical CT were 96.4% and 95.0%, respectively.
94 86 to October 1999 that evaluated the use
of helical CT for the diagnosis of pulmonary embolism.
95 Use
of helical CT in the diagnosis of pulmonary embolism has no
96 Perspective views
of helical CT and MR images were reconstructed from the dat
97 Simulations that were based
on helical CT images with 5-mm collimation reconstructed ev
98 efects with corresponding misregistration
on helical CT-PET fusion images that resolved after correct
99 eatment in patients with negative results
on helical CT is uncertain.
100 f selected patients with negative results
on helical CT who did not receive anticoagulant therapy.
101 Forty-nine patients underwent pre-
operative helical CT with multiplanar reconstructions.
102 though further work must be done to
optimize helical CT grading systems and scanning protocols, the d
103 lt patients underwent either scintigraphy
or helical CT for possible PE for 25 months.
104 During a 29-month
period,
helical CT with oral, rectal, and intravenous contrast m
105 Arterial
phase helical CT (3-mm collimation, 1-mm reconstruction interv
106 arteries can be delineated on arterial
phase helical CT scans by using optimized techniques.
107 ists reviewed 100 consecutive arterial
phase helical CT scans of the pancreas in patients with normal
108 Dual-
phase helical CT scans were obtained in 80 patients with nonhe
109 manganese-enhanced MR imaging and dual-
phase helical CT were not statistically different.
110 ving pancreatic disease underwent dual-
phase helical CT.
111 sent in 77 patients who underwent dual-
phase helical CT.
112 Compared with single-
phase helical CT, MR imaging depicted more sites of extrahepat
113 Triple-
phase helical CT was performed in 31 patients with proved carc
114 Two-
phase helical CT does not improve sensitivity but does improve
115 Two-
phase helical CT with pancreatic phase acquisition provides st
116 t dual-phase (ie, arterial and portal
phase)
helical CT and phased-array MR imaging (ie, unenhanced f
117 election, KUB radiography, and even
positive helical CT findings were all found to have a low positiv
118 Among the 80 patients with
positive helical CT findings, 56.5% were found to have obstructio
119 hanced and HAP and portal venous phase (
PVP)
helical CT studies.
120 Renal helical CT is a suitable replacement for intravenous uro
121 dimensional liver CT with multi-detector
row helical CT technology.
122 ere randomized to undergo multi-detector
row helical CT with either an interactive protocol (n = 23)
123 iously reported data for single-detector
row helical CT with oral contrast material.
124 s fast as that with single multidetector-
row helical CT (1.0-10.0 mm per rotation) with fully compara
125 ume coverage speed of four multidetector-
row helical CT (range, 3.75-30.00 mm per rotation) is at lea
126 ector-row helical CT, four multidetector-
row helical CT provides a two- to threefold improvement in v
127 facts with four and single multidetector-
row helical CT were compared in both a phantom study and a s
128 Compared with single multidetector-
row helical CT, four multidetector-row helical CT provides a
129 Compared with single multidetector-
row helical CT, the volume coverage speed of four multidetec
130 /CT using (82)Rb, a 16-slice PET/CT
scanner,
helical CT attenuation correction with breathing and als
131 racterization, despite use of a thin-
section helical CT data acquisition technique.
132 specificity but relatively low
sensitivity,
helical CT may not have the ideal attributes of a first-
133 at the same location and rate during
serial helical CT imaging of the extravasation site.
134 rent clinical practice of obtaining a
single helical CT scan provides only a snapshot of the respirat
135 Patients underwent FIGO clinical
staging,
helical CT, and MRI.
136 Misregistration of
standard helical CT PET images caused artifactual PET defects in
137 I) CT angiography was compared with
standard helical CT angiography, the arterial phase of dynamic CT
138 ltisection helical CT compared with
standard helical CT, and the need for sedation was eliminated in
139 Tailored helical CT and pulmonary arteriography were performed wi
140 The helical CT AIF can be used to improve the semiquantitati
141 s the role and recommended protocols for
the helical CT diagnosis of thoracic aortic trauma; aortic d
142 Patients in
the helical CT group were hospitalized more often, had more
143 Immediately
thereafter,
helical CT of the entire abdomen and pelvis was performe
144 l glands and then contrast-enhanced
thoracic helical CT from the lung apices through the entire liver
145 All patients underwent nonenhanced
thoracic helical CT from the lung apices through the adrenal glan
146 ar intrahepatic portosystemic shunts (
TIPS),
helical CT angiography was performed in 10 patients with
147 Cine CT offers an alternative
to helical CT for compensating for respiratory motion in th
148 With
triphasic helical CT, the prospective and retrospective rates of i
149 22 with ARDSP and 11 with ARDSEXP,
underwent helical CT shortly after intubation.
150 aving diverticulitis prospectively
underwent helical CT after the administration of contrast material
151 having appendicitis prospectively
underwent helical CT limited to the lower abdomen.
152 Unenhanced helical CT depicted common bile duct stones in 15 of 17
153 Unenhanced helical CT images with 5-mm collimation were obtained fr
154 Unenhanced helical CT is an accurate technique in the evaluation of
155 Unenhanced helical CT is useful for evaluating suspected choledocho
156 Results of AAS and
unenhanced helical CT examinations were compared with chi2 analysis
157 AAS and
unenhanced helical CT images were each separately and prospectively
158 atios were calculated for AAS and
unenhanced helical CT.
159 acute abdominal series (AAS) and
unenhanced helical CT.
160 lysis of pelvic calcifications at
unenhanced helical CT can help differentiate calculi from phlebolit
161 lvic calcifications identified at
unenhanced helical CT in 113 patients.
162 Among the 91 patients examined,
unenhanced helical CT yielded an overall sensitivity, specificity,
163 nts who weighed less than 200 lb,
unenhanced helical CT performed at a reduced tube current of 100 mA
164 The accuracy of
unenhanced helical CT was significantly greater than the accuracy o
165 dard practice is heavily based on
unenhanced helical CT for detecting uroliths.
166 recommended can directly undergo
unenhanced helical CT; plain radiographs need not be obtained first
167 ted choledocholithiasis underwent
unenhanced helical CT immediately before undergoing ERCP.
168 Ungated helical CT depicts coronary arterial calcium better than
169 ducts were generated in 16 patients by
using helical CT data sets and endoscopic three-dimensional re
170 digital subtraction angiography (DSA)
versus helical CT angiography (CTA) or MR angiography (MRA) for
171 disease was determined more accurately
with helical CT scans (accuracy of 0.79 for each of the two r
172 d no difference in sensitivity compared
with helical CT scans.
173 small accessory artery was not depicted
with helical CT, and angiography did not depict an accessory
174 The average fetal radiation dose
with helical CT is less than that with ventilation-perfusion
175 Detection of pulmonary embolism
with helical CT may be less accurate than previously reported
176 ravasation was definitively established
with helical CT at the injection site (injection rate, from 1
177 astomoses in 17 patients were evaluated
with helical CT.
178 tenuation correction (AC) of PET images
with helical CT (HCT) in PET/CT matches only the spatial reso
179 nal venous anomalies were depicted only
with helical CT.
180 que was statistically better quantified
with helical CT than with electron-beam CT (P =.004).