ライフサイエンスコーパス: echo time

1 dial center-out readout (UTE, or "ultrashort echo time").

2 d from chemical shift-encoded imaging (eight echo times).

3 mages, differences increased with increasing echo time.

4 years but remained detectable only at short echo time.

5 es but not in a later one using intermediate echo time.

6 resolved spectroscopy (PRESS) with a 35-msec echo time.

7 z bandwidth, 0.81-kHz amplitude, and 45-msec echo time.

8 s a physical property that is independent of echo time.

9 ry with different image contents at multiple echo times.

10 , and R2* maps calculated by using different echo times.

11 asively from 23Na images obtained with short echo times (0.4 msec) by using external saline solution

12 23)Na signal intensities measured from short echo-time (0.4 msec) (23)Na images to those from an exte

13 ic resonance spectra (repetition time =10 s; echo time =0.35 ms) were acquired every 160 seconds befo

14 al UTE (1.0-mm isotropic spatial resolution; echo time, 0.08 msec) were performed at 3 T.

15 pulse sequence (repetition time, 1.60 msec; echo time, 0.65 msec) and bolus intravenous injection of

16 sional acquisition (repetition time, 4.1 ms; echo times, 0.09/1.09/2.09 ms; field strength, 3 T).

17 gadopentetate dimeglumine and use of a short echo time (1 msec).

18 udy in 2008-2009 to repeat the previous long echo-time (1)H-MRS study with (1)H-MRS at both long (TE

19 out of phase (repetition time, 45-180 msec; echo time, 1.4-3.1 msec).

20 GRE sequence (repetition time, 600-750 msec; echo time, 10 msec; in-plane resolution, 196 mm).

21 equence (typically repetition time, 34 msec; echo time, 13 msec; flip angle, 60 degrees ).

22 Quantitative short echo time 1H MRS identified abnormalities in 87% of pati

23 -echo technique (repetition time, 9-12 msec; echo time, 2.1-3.0 msec; flip angle, 30 degrees).

24 ngle shot sequence: repetition time, 5 msec; echo time, 2.3 msec; flip angle, 15 degrees; one coronal

25 oronal acquisition (repetition time, 7 msec; echo time, 2.8 msec; flip angle, 60 degrees) during a si

26 Studies using echo time 20 ms also showed significantly greater reduct

27 te matter (8 cm3 volume, STEAM sequence with echo time = 20 msec, repetition time = 3.0 seconds) and

28 nce, followed by T2*-weighted gradient-echo (echo time, 25 msec; repetition time, 944 msec) imaging a

29 pulation (replication sample) underwent long echo time (272 msec) proton (hydrogen 1) MR spectroscopy

30 A short echo-time (29 msec) single-voxel (1-cm(3)) proton (hydro

31 resolved spectroscopic (PRESS) localization (echo time 30 ms, repetition time 3000 ms, nominal voxel

32 quence (1.5 T; time to repetition = 2000 ms; echo time = 30 ms; 192 averages).

33 ent 1H-MRSI on a 1.5 T GE Signa scanner [TE (echo time) = 30 ms, TR (repetition time) = 3 s].

34 -echo sequence (repetition time, 3,000 msec; echo time, 30 msec).

35 point-resolved spectroscopy, relaxation time/echo time = 3000/30 ms) in frontal white matter (FWM) an

36 resonance imaging (repetition time = 800 ms; echo time = 37 ms; voxel size = 2.0 x 2.0 x 2.0 mm(3); m

37 ubjects underwent structural MRI and a 0.4ms echo time 3D T1-weighted sodium scan as well as the knee

38 magnetic resonance; repetition time: 72 ms; echo time: 45 ms; flip angle: 30 degrees; field of view:

39 e frames in the cardiac cycle, using a short echo time (5 ms) multislice gradient-echo imaging sequen

40 Fast-spiral-sequence (echo time = 5.6-13.8 ms, repetition time = 1 s, 8 interl

41 r imaging (3/1 mm; repetition time, 3000 ms; echo time, 50 ms) were analyzed using second-level rando

42 M MRI was performed with all combinations of echo times (57, 70, 150, and 200 msec) and b values (0,

43 imaging parameters: repetition time 300 ms, echo time 8 ms, 2-tesla system), followed by triphenylte

44 ESS acquisition optimized for 2HG detection (echo time, 97 msec) at 3.0 T before any treatment.

45 or FLASH, sequence with short repetition and echo times after intravenous administration of gadopente

46 A spoiled gradient-echo sequence with seven echo times alternately in phase and out of phase was use

47 tients showed increased artifact with longer echo time and higher concentration of injected contrast

48 th long (TE = 270 ms) and short (TE = 30 ms) echo time and higher field strength (3T) to test whether

49 e water signal at MR imaging with very short echo time and radial center-out readout (UTE, or "ultras

50 -enhanced imaging) and HM-MRI (with multiple echo times and b value combinations) from August 2012 to

51 on reconstruction technique to achieve short echo times and high signal-to-noise ratio (SNR) efficien

52 length at either large or small scales using echo timing and fringe counting.

53 terogeneity was explained by glioma subtype, echo time, and the proportion of recurrent glioma versus

54 nt-echo pulse sequence, short repetition and echo times, and a rate of three frames per second.

55 weighted imaging, MR imaging with very short echo times, and the availability of some targeted MR ima

56 osine ((18)F-FET) PET; 3-T MRSI with a short echo time; and fluid-attenuated inversion recovery, T2-w

57 nts with first-episode psychosis by means of echo time-averaged proton MRS at 4T.

58 ingulate cortex of the subjects by using the echo time-averaged proton MRS technique at 4T (i.e., mod

59 ing the results obtained with the ultrashort-echo-time-based attenuation correction maps currently us

60 mu map (mu mapDX) and a dual-echo ultrashort-echo-time-based mu map (mu mapUTE), which are both calcu

61 th GWI no longer had reduced NAA/tCr at long echo time but had significantly lower basal ganglia NAA/

62 QSM was performed for various ranges of echo time by using both the magnitude and phase componen

63 MRI with ultrashort echo time can be used to image the lung parenchyma and l

64 23Na MR imaging with short echo times can be used to quantify absolute tissue sodiu

65 ersion recovery, steady-state, fast gradient-echo time course perfusion, and delayed inversion recove

66 OLD (artifactual) components based on linear echo-time dependence of signals-a characteristic propert

67 A novel dual-echo ultrashort echo time (DUTE) MRI sequence was proposed for head imag

68 nical MR system (repetition time, 11.4 msec; echo time [first echo], 3.7 msec; 18,000 projection angl

69 Sequence parameters (repetition time, echo time, flip angle, echo train length) were matched a

70 reported attempts with dual-echo ultrashort echo time, for which the Jaccard distance was in the 47%

71 Ultrashort echo-time free-breathing MRI acquisitions were performed

72 This study demonstrates that multiple echo times from UTE with 3 T MRI can provide excellent a

73 on-curarized awake state using a quiet, zero echo time, functional magnetic resonance imaging (fMRI)

74 eins in the brain, a three-dimensional, long echo time, gradient-echo sequence that depended on the p

75 hold, coronal, three-dimensional, ultrashort-echo-time, gradient-echo sequences of the lungs were acq

76 l or fast spin-echo and gradient-echo (GRE) (echo time > or = 6.0 msec) imaging were identified.

77 py studies at higher fields and with shorter echo time have revealed abnormalities in glutamate and g

78 Three-dimensional T1-weighted ultrashort echo time images and R2* maps of the kidneys were acquir

79 Chemical-shift images with six widely spaced echo times (in 3.5-msec increments) were acquired to cor

80 basal ganglia NAA/tCr than controls at short echo time (left: 1.22 +/- 0.02 vs. 1.38 +/- 0.03, P < 0.

81 Short echo time localized proton magnetic resonance spectrosco

82 ere examined with a hybrid radial ultrashort echo time magnetic resonance (MR) imaging sequence at 3.

83 st.Objectives: Respiratory-gated, ultrashort echo time magnetic resonance imaging was used to test th

84 ucted using quality metrics, field strength, echo time, medication, age, and stage of illness.

85 lgorithm was based on a dual-echo ultrashort-echo-time MR imaging sequence to calculate the R2 map, f

86 Localized single-voxel, 20-msec-echo-time MR spectra (including N-acetylaspartate [NAA],

87 Conclusion Three-dimensional ultrashort echo time MRI in the lungs allowed for functional imagin

88 ted method with three-dimensional ultrashort echo time MRI reproducibly quantified the volumetric ext

89 Short-echo-time MRS was used to measure N-Acetyl-aspartate (NA

90 locity-encoding value) (repetition time msec/echo time msec = 16/9).

91 e Look-Locker approach (repetition time msec/echo time msec, 1,000/3.5; flip angle, 10 degrees ).

92 T2 weighted (repetition time msec/effective echo time msec, 1,800-3,000/30-102).

93 lanar imaging sequence (repetition time msec/echo time msec, 10 123/40; b=1200 sec/mm2).

94 ressed T2-weighted MRI (repetition time msec/echo time msec, 1000/87; section thickness, 6 mm) of the

95 ressed T2-weighted MRI (repetition time msec/echo time msec, 1000/87; section thickness, 6 mm) of the

96 ressed T2-weighted MRI (repetition time msec/echo time msec, 1000/87; section thickness, 6 mm) of the

97 ressed T2-weighted MRI (repetition time msec/echo time msec, 1000/87; section thickness, 6 mm) of the

98 oronal T2-weighted MRI (repetition time msec/echo time msec, 1000/89; section thickness, 4 mm) of the

99 ted inversion recovery (repetition time msec/echo time msec, 11 000/125) MRI and (b) axial turbo spin

100 ted inversion recovery (repetition time msec/echo time msec, 11 000/125) MRI and (b) axial turbo spin

101 ted inversion recovery (repetition time msec/echo time msec, 11 000/125) MRI and (b) axial turbo spin

102 ted inversion recovery (repetition time msec/echo time msec, 11 000/125) MRI and (b) axial turbo spin

103 (23)Na (repetition time msec/echo time msec, 160/0.35) and (35)Cl (40/0.6) MR imaging

104 weighted gradient-echo (repetition time msec/echo time msec, 180/2.3; transmission angle, 55 degrees

105 DC maps were generated (repetition time msec/echo time msec, 2000/67; section thickness, 4 mm; in-pla

106 turated fast spin-echo (repetition time msec/echo time msec, 2220/57; section thickness, 4 mm), (b) a

107 turated fast spin-echo (repetition time msec/echo time msec, 2220/57; section thickness, 4 mm), (b) a

108 turated fast spin-echo (repetition time msec/echo time msec, 2220/57; section thickness, 4 mm), (b) a

109 suspended respiration (repetition time msec/echo time msec, 3.2/1.6; section thickness, 5 mm; in-pla

110 m a spin-echo sequence (repetition time msec/echo time msec, 3000/20-320).

111 le-shot fast spin-echo (repetition time msec/echo time msec, 4,500/940) imaging was performed in the

112 ole-heart acquisitions (repetition time msec/echo time msec, 4/1.35; 20 degrees flip angle; 1 x 1 x 2

113 a) Coronal T2-weighted (repetition time msec/echo time msec, 4574/86.5) MR image of the pelvis.

114 a) Coronal T2-weighted (repetition time msec/echo time msec, 4574/86.5) MR image of the pelvis.

115 orthogonal planes, with repetition time msec/echo time msec, 5-12/62-95; number of signals acquired,

116 eighted 1.5-T MR image (repetition time msec/echo time msec, 541/15).

117 -dimensional MR images (repetition time msec/echo time msec, 8.86/4.51; flip angle, 25 degrees ) acqu

118 gradient-echo sequence (repetition time msec/echo time msec, 800/1.8-49.8) was performed at embryonic

119 resonance (MR) imaging (repetition time msec/echo time msec/inversion time msec [fixed], 5.2/2.5/430;

120 ging (first and second repetition times msec/echo time msec: 72, 192/2.2; transmission angle: 60 degr

121 t suppression (4.2/1.8 [repetition time msec/echo time msec], 12 degrees flip angle), was performed i

122 tions (3.6-4.5/1.5-1.9 [repetition time msec/echo time msec], 12 degrees flip angle).

123 uence (3.4-6.8/1.2-2.3 [repetition time msec/echo time msec], 25 degrees -40 degrees flip angle).

124 aging (3.8-4.2/1.3-1.7 [repetition time msec/echo time msec], 25 degrees-40 degrees flip angle) was p

125 2 x 352 matrix, 58/2.0 [repetition time msec/echo time msec], 30 degrees flip angle, 15.6-kHz bandwid

126 echo sequence (3.4/1.2 [repetition time msec/echo time msec], 45 degrees flip angle, and six to eight

127 -echo imaging (4.2/1.8 [repetition time msec/echo time msec]; flip angle, 12 degrees; interpolation i

128 cho spin-echo sequence (repetition time msec/echo times msec, 1500/24, 36, 48, 60, 72, 84, 96, 108, 1

129 ort echo time sequence (repetition time msec/echo times msec, 30/0.075, 2, 5, 12, 18).

130 ady-state precession (repetition time [msec]/echo time [msec] = 5.0/2.0, with 50 degrees flip angle)

131 top NMR system using a CPMG sequence with an echo time of 1.25 ms providing the ability to detect sig

132 x 220 microns, slice thickness of 1 mm, and echo time of 16 ms.

133 alize, with a relaxation time of 3000 ms and echo time of 30 ms.

134 negative TLE patients underwent 1H MRS at an echo time of 30 msec on a 1.5-T GE Signa scanner.

135 Spectra obtained with an echo time of 31 msec showed resonances from water and mo

136 quence with a repetition time of 18 msec, an echo time of 5 msec, and a flip angle of 10 degrees show

137 d-echo sequence with the shortest attainable echo time of approximately 4 msec (T2* mapping).

138 uence with a repetition time of 550 msec and echo times of 12.8, 19.8, and 26.8 msec.

139 increase in glutamate was similar when using echo times of 30 and 144 ms, indicating that exercise-re

140 eady state, or GRASS, sequence was used with echo times of 4-40 msec at 4-msec increments.

141 ose of metabolic quantification at 3.0 T and echo times of less than 100 msec, an average T2 value pe

142 Ultrashort-echo-time or zero-echo-time (ZTE) pulse sequences can ca

143 on In lungs with cystic fibrosis, ultrashort echo time oxygen-enhanced MRI showed similar performance

144 ith QSM did not show significant change over echo time (P = .31), and the variation was significantly

145 A short echo time Point RESolved Spectroscopy (PRESS) spectrosco

146 n age, 25 years) by using single-voxel short-echo-time point-resolved 1H MR spectroscopy.

147 and single-voxel MR spectroscopy with a long-echo-time point-resolved technique.

148 )/total creatine (tCr) ratio found with long echo-time proton magnetic resonance imaging ((1)H-MRS) o

149 The tissues underwent ultrashort echo time quantitative susceptibility mapping (UTE-QSM)

150 tion by using a three-dimensional very short echo time sequence (repetition time msec/echo times msec

151 e-echo sliding inversion recovery ultrashort echo time sequence can generate whole-brain myelin image

152 n, liver, and kidney and a radial very-short-echo time sequence for lung imaging.

153 batic inversion recovery-prepared ultrashort echo time sequence provided efficient water signal suppr

154 and T2* maps were acquired with the variable echo-time sequence and the GAG CEST values were acquired

155 s (N = 21) were acquired with an ultra-short echo-time sequence using a non-Cartesian k-space samplin

156 signal contrast as well as marked ultrashort echo time signal reduction in multiple sclerosis lesions

157 We conducted a short echo time, single-voxel, in vivo proton spectroscopy stu

158 ied point resolved spectroscopy sequence: 24 echo time steps with 20-ms increments).

159 Water-suppressed, long echo time, stimulated-echo hydrogen-1 chemical shift ima

160 Longer echo time substantially reduced the sensitivity of (1)H-

161 ges (intermediate-weighted sequence, 34-msec echo time; T2-weighted sequence, 80-msec echo time) were

162 field strengths (e.g., B0 = 3T) and shorter echo time TE (< 16 ms).

163 ge-bone specimens at 3 T by using ultrashort echo time (TE) (UTE) and conventional pulse sequences to

164 meters were number of excitations (NEX) = 1, echo time (TE) = 14 msec, recovery time (TR) = 2 sec, ec

165 of nose fMRI by using novel ultrashort/zero echo time (TE) MRI.

166 Here, we investigated the use of long-echo time (TE) proton magnetic resonance spectroscopy (1

167 magnetic resonance spectroscopy (MRS), short-echo time (TE) sequences are frequently employed to esti

168 ion (MEDIC), T2-weighted GRE with an 11-msec echo time (TE), and T2-weighted GRE with a 15-msec TE.

169 rformed at short (< 45 ms) or long (> 45 ms) echo time (TE), each with particular advantages.

170 for quantification of high-resolution short-echo-time (TE) echo-planar spectroscopic imaging (EPSI)

171 ighted conventional SE (repetition time msec/echo time [TE] msec = 3,100/ 80,160) and fast SE (5,000-

172 d fast spin-echo (FSE) (repetition time msec/echo time [TE] msec, 4,000/13), sagittal T2-weighted FSE

173 trospectively evaluated gradient-echo (GRE) (echo time [TE], > or = 9 and 4-5 msec) and turbo short i

174 3D UTE sequence during single breath holds (echo time [TE], 0.05 msec) and with a self-navigated "Ko

175 ed: gradient-echo (GRE) echo-planar imaging (echo time [TE], 30 msec; flip angle, 90 degrees ; n = 10

176 acquiring single-quantum images at multiple echo times (TEs) and applying voxel-wise matrix inversio

177 varying the number of grey levels (GLs) and echo times (TEs), in a sample of healthy controls and pa

178 resonance (MR) images obtained at different echo times (TEs).

179 quisition with echo shifting, which leads to echo times that are longer than the repetition time.

180 c imaging (MRSI) with intermediate and short echo time to measure corrected myo-inositol (mI)normaliz

181 th short (TE = 30 ms) and long (TE = 270 ms) echo time to measure metabolites and at five TE values b

182 iple spin-echo (SE) technique with different echo times to measure T1 and T2, respectively.

183 n time (to suppress T1 effects) and multiple echo times (to estimate T2 effects); the reference fat f

184 angle (to suppress T1 effects) and multiple echo times (to estimate T2* effects); imaging FF was cal

185 follows: for proton density, repetition time/echo time (TR/TE) 2300/5.6; for T2, TR/TE 2300/62; and f

186 hydrogen-1 chemical shift imaging and short echo time unsuppressed chemical shift imaging were perfo

187 Ultra-short echo time (UTE) acquisitions minimize signal loss when p

188 n is a major challenge for direct ultrashort echo time (UTE) imaging of myelin in vivo because water

189 ased numeric approach with use of ultrashort echo time (UTE) magnetic resonance (MR) imaging in vivo

190 ty of pulmonary three-dimensional ultrashort echo time (UTE) MRI at breath holding for quantitative i

191 Ultrashort echo time (UTE) MRI can acquire high signal from tendons

192 alidity of three-dimensional (3D) ultrashort echo time (UTE) MRI for the assessment of emphysema in p

193 To compare three-dimensional (3D) ultrashort echo time (UTE) MRI functional lung data to common funct

194 we have investigated the use of Ultra-short Echo Time (UTE) MRI, using a 3D cones acquisition trajec

195 mance of three-dimensional radial ultrashort echo time (UTE) oxygen-enhanced (OE) MRI with that of hy

196 om myelin can be detected with an ultrashort echo time (UTE) sequence.

197 red using the standard DIXON- and ultrashort echo time (UTE)-based approaches.

198 generate whole-head mu maps from ultrashort echo-time (UTE) MR imaging sequences.

199 Ultrashort-echo-time (UTE) sequences have been proposed in the past

200 Ultrashort-echo-time (UTE) sequences have been used to separate cor

201 Background Lung MRI with ultrashort echo times (UTEs) enables high-resolution and radiation-

202 Optimal effective echo time was 50 msec.

203 When echo time was increased from approximately 20 to 40 msec

204 In three subjects, echo time was varied to determine the glycogen and choli

205 A series of T2-weighted pulses with 16 echo times was used to enable precise T2 mapping and cal

206 nal radial gradient-echo sequence with short echo time, we performed sodium magnetic resonance imagin

207 hodological variables, such as voxel size or echo time were found.

208 MR elastographic pulse sequences with short echo times were compared with those obtained with the co

209 GRE sequences with short repetition and echo times were more accurate and precise than spin-echo

210 attenuated (median 45% decrease) when longer echo times were used for venous suppression, but it did

211 sec echo time; T2-weighted sequence, 80-msec echo time) were compared in vivo with corresponding conv

212 sacroiliac joints by using MRI sequence zero echo time (zero ET) as a reference standard.

213 h the addition of the new 3D THRIVE and zero echo time (zero ET) sequences.

214 ts between computed tomography (CT) and zero echo time (ZTE) magnetic resonance (MR) imaging of the s

215 ut, while the second model incorporated zero echo time (ZTE) MRI scans.

216 kground soft tissue contrast, whereas a zero echo time (ZTE) MRI sequence provides cortical bone cont

217 Ultrashort-echo-time or zero-echo-time (ZTE) pulse sequences can capture bone informa

218 n brain PET/MRI, the major challenge of zero-echo-time (ZTE)-based attenuation correction (ZTAC) is t

219 a novel, recently published method for zero-echo-time (ZTE)-based MR bone depiction and segmentation

220 oducibility of pseudo-CT MRI sequences (zero echo time [ZTE], gradient-echo black bone [BB]) in detec