ライフサイエンスコーパス: collimator

1 r the geometric response of the radionuclide collimator.

2 ng a camera system fitted with a high-energy collimator.

3 scintillation camera equipped with a pinhole collimator.

4 er as well as scatter and penetration in the collimator.

5 of acquisition orbit but not by the type of collimator.

6 ator with a conventionally used, high-energy collimator.

7 e of a long focal length, asymmetric fanbeam collimator.

8 C-arm and a gamma camera with a four-pinhole collimator.

9 teral breast is decreased with the multileaf collimator.

10 equipped with a dedicated clustered pinhole collimator.

11 phantom and a high-resolution parallel-hole collimator.

12 ing a SPECT system equipped with a dedicated collimator.

13 ources of 99mTc were placed directly on each collimator.

14 the corrugations on crystalline surfaces as collimator.

15 hin carbon foil (~5 nm) placed over the beam collimator.

16 ollimator face of 10 cm or more for the HEGP collimator.

17 SPECT) or parallel-hole (conventional SPECT) collimator.

18 rmed on a gamma-camera using a parallel-hole collimator.

19 rmed on a gamma-camera using a parallel-hole collimator.

20 of a camera system fitted with a high-energy collimator.

21 th 40 times greater purity than conventional collimators.

22 d with all-purpose and ultra-high-resolution collimators.

23 sensitivity compared with SPECT with 511-keV collimators.

24 rdial nonuniformity increased 10%) with LEHR collimators.

25 a triple-head camera equipped with fan-beam collimators.

26 fferent detector sizes collimated by fanbeam collimators.

27 c., Cleveland, OH) to image 18F with 511 keV collimators.

28 vity at similar resolution compared to other collimators.

29 e layers of gadolinium, were attached to the collimators.

30 tem fitted with medium-energy, parallel-hole collimators.

31 ows, with both medium-energy and high-energy collimators.

32 tion compared with parallel-hole and fanbeam collimators.

33 ty in comparison with standard parallel-hole collimators.

34 e (HEGP; for (131)I and (18)F) parallel-hole collimators.

35 llimators and from 53 to 175 cps/MBq for rat collimators.

36 ted images using a combination of converging collimators.

37 nd geometric blurring caused by radionuclide collimators.

38 m photomultiplier tubes, and a parallel-hole collimator (1.5-mm bore width, 23.6-mm bore length).

39 of the Inveon SPECT system using 6 different collimators: 3 dedicated for mouse imaging and 3 for rat

40 f the X-ray fluorescence through the pinhole-collimator allowed the two-dimensional elemental mapping

41 usion: The triple-head SPECT system with MPH collimators allows reliable DAT SPECT after administrati

42 antification of 131I using SPECT with an UHE collimator and a constant calibration factor.

43 ed methodology for partitioned GRIN-PC based collimator and Bessel-beam generator is proposed and exp

44 The new system features a novel antiscatter collimator and data correction method to address the cha

45 improvement in photon sensitivity due to the collimator and imaging geometry, as well as image resolu

46 t that septal penetration and scatter in the collimator and other detector-head components are import

47 , while the agreement between SPECT using HE collimator and PET are moderate (kappa = 0.413).

48 eement (kappa = 0.736) between SPECT with UH collimator and PET, while the agreement between SPECT us

49 Between FDG-SPECT using an HE collimator and that using a 511-keV collimator, the latt

50 A combination of 2 HCB collimators and 1 fanbeam collimator, compared with a tr

51 ode with a triple-head SPECT system with MPH collimators and a 30-min net scan duration after injecti

52 tained with a combination of HCB and fanbeam collimators and compared with a triple-fanbeam circular

53 y for brain imaging, was combined with other collimators and compared with conventional parallel-beam

54 However, all combinations of the applied collimators and energy windows were capable of producing

55 We then fabricate beam collimators and experimentally compare performance chara

56 vity varies from 29 to 404 cps/MBq for mouse collimators and from 53 to 175 cps/MBq for rat collimato

57 e performed to calculate the efficiencies of collimators and their combinations and to quantitatively

58 ation filter, an integral 3D printed pinhole collimator, and a ball lens, which collects fluorescence

59 face, (b) determines the rotations of couch, collimator, and gantry using three matrices about the ca

60 ependent of the gamma camera system, type of collimator, and orbit.

61 ependent of the gamma camera system, type of collimator, and orbit.

62 nal SPECT camera equipped with parallel hole collimators, and hybrid SPECT/CT images were acquired us

63 )Tc during FDG coincidence imaging with LEHR collimators, and the effect of the presence of FDG durin

64 d (d) customized fields, by adjusting width, collimator angle, and gantry angle and by using customiz

65 ew projection plane, (d) optimizes couch and collimator angles by selecting the least total unblocked

66 fields with beam's-eye-view optimization of collimator angles for axillary and breast coverage; (c)

67 al fields with adjustment of field width and collimator angles; and (d) customized fields, by adjusti

68 rein, the sensitivity and resolution of this collimator are reevaluated.

69 al, beam-shaping filters, and dynamic z-axis collimators are important, and education to successfully

70 PSF due to collimator penetration for the PC collimator as compared with the HEGP collimator (e.g., 0

71 The literature treats this collimator as having the same sensitivity as a single-pi

72 ained with the 240-keV window, medium-energy collimator, attenuation and scatter correction, 30 itera

73 600 resolving power was obtained with a beam collimator before the ELIT.

74 Multileaf-collimator blocking for primary breast treatment is simi

75 m collimator, compared with a triple-fanbeam collimator, can increase the photon detection efficiency

76 8 in.) and high-resolution, ultrahigh-energy collimators capable of 511 keV imaging has permitted FDG

77 eared after recalibration (first scanner) or collimator cleaning (second scanner).

78 rain scans showed improved quality with this collimator combination due to increased sensitivity and

79 A slit-slat collimator combines a slit along the axis of rotation wi

80 mbination of 2 HCB collimators and 1 fanbeam collimator, compared with a triple-fanbeam collimator, c

81 th good reproducibility across the 9 scanner-collimator configurations (intraclass correlation coeffi

82 the LC-QSPECT method across multiple scanner-collimator configurations and comparing performance with

83 ty of dose estimates across multiple scanner-collimator configurations using LC-QSPECT by calculating

84 ntly improved reproducibility across scanner-collimator configurations, accuracy, and test-retest rep

85 antification methods across multiple scanner-collimator configurations.

86 ading artifacts across a plethora of scanner-collimator configurations.

87 was conducted with 9 simulated SPECT scanner-collimator configurations.

88 rs by means of a novel cylindric high-energy collimator containing 162 narrow pinholes that are group

89 ted data from 2 and 4 views of the 9-pinhole collimator demonstrated good lesion definition and also

90 The fanbeam collimator demonstrated high resolution SPECT performanc

91 ed by lower sensitivity, photon scatter, and collimator design constraints.

92 g a second-generation multiple-pinhole (MPH) collimator designed for brain SPECT with improved count

93 PECT imaging with an ultra-high-energy (UHE) collimator designed for imaging 511-keV photons.

94 A high-sensitivity half-cone-beam (HCB) collimator, designed specifically for brain imaging, was

95 gher sensitivity and resolution, using novel collimator designs based on tungsten.

96 tems that use solid-state crystals and novel collimator designs configured specifically for cardiac i

97 with the effects of nonuniform attenuation, collimator-detector response and scatter.

98 tion, photon scatter, and distance-dependent collimator-detector response are major degrading factors

99 The energy- and distance-dependent collimator-detector response was modeled with precalcula

100 luded the effects of nonuniform attenuation, collimator-detector response, and scatter.

101 A half-cone beam collimator does not have the problem of truncation.

102 the PC collimator as compared with the HEGP collimator (e.g., 0.9 vs. 1.4 cm in full width at half m

103 he LEHR and HEGP collimators than for the PC collimator (e.g., 3.1 x 10(-5) vs. 2.9 x 10(-5) counts p

104 nd realized here using an 'inelastic thermal collimator' element.

105 clinical PET system uses a clustered-pinhole collimator, enabling high-resolution, simultaneous imagi

106 e for (131)I and (18)F at distances from the collimator face of 10 cm or more for the HEGP collimator

107 n collimator, over the range 0-6 cm from the collimator face.

108 The collimator focal length was 16 cm and the distance from

109 ed in front of a gamma camera with cone beam collimator focused at the x-ray focal spot.

110 overy coefficients as compared with the HEGP collimator for (131)I and (18)F.

111 ate a planar integrated photonic source beam collimator for use in on-chip optofluidic sensing applic

112 oefficients were similar for the PC and LEHR collimators for (99m)Tc but that the PC collimator signi

113 The use of cone-beam collimators for brain imaging with triple-camera SPECT s

114 tonics will find applications in lightweight collimators for displays, as well as chromatically corre

115 of light, for example, solar concentrators, collimators for light sources, integrated optical compon

116 New high-energy collimators for single photon emission computed tomograp

117 a conventional Anger camera with cardiofocal collimators for the assessment of left ventricular (LV)

118 transmission was reduced with the multileaf collimator from 4% to 1%.

119 reconstructed projection data of a 9-pinhole collimator from a digital heart phantom with a basal les

120 y were analyzed as a function of the type of collimator, gamma camera system, and type of orbit (180d

121 This collimator has a sensitivity that increases for points n

122 a single-slice prototype of the proposed PC collimator has shown the potential for significantly imp

123 the underlying radionuclide and the related collimator have a major influence on the calibration, no

124 tems equipped with a high-energy, or 511-keV collimator, have been proposed to offer a less expensive

125 This predicts that a 9-pinhole collimator having the same spatial resolution as a paral

126 ed with either a high-energy general-purpose collimator (HE), or the dedicated 511-keV collimator (UH

127 ing the same sensitivity as a single-pinhole collimator, ignoring the effect of the axial septa.

128 ow had either scattered in or penetrated the collimator, indicating the significance of collimator in

129 e collimator, indicating the significance of collimator interactions.

130 a equipped with a low-energy high-resolution collimator interfaced with a computer.

131 dicated cardiac SPECT system with 19 pinhole collimators interfaced with 64-slice CT.

132 This collimator is placed in an existing SPECT system (U-SPEC

133 The sensitivity of this collimator is proportional to h(-1) and has resolution i

134 A gamma camera with a pinhole collimator is used to acquire projections of the radionu

135 from SPECT systems with uniform sensitivity collimators is considerably lower than the theoretical o

136 The reason for combining collimators is to ensure both high sensitivity and suffi

137 requires only a gamma camera with a pinhole collimator, it has the potential to be applied in any ho

138 Pinhole collimators made of high-density and high atomic number

139 e 2,615-keV (208)Tl emission produced in the collimators make up most of the acquired energy spectrum

140 oth short-bore (35 mm) and long-bore (50 mm) collimators, matched to the geometry of the detector ele

141 Buildup data for the multileaf collimator most closely resembled the surface dose when

142 fficiency of a 9-pinhole and a parallel-hole collimator mounted to a standard nuclear medicine gamma-

143 fication is 10.9 +/- 0.8%, while without the collimator no rectification is detectable (<0.3%).

144 quality, beam-limiting devices (apertures or collimators), noise power spectrum (NPS) analysis algori

145 coupled, in a coaxial geometry, to a pinhole collimator of small diameter.

146 d with PET, SPECT with the dedicated 511-keV collimator offers a low-cost, practical alternative to P

147 performed to investigate the effect of LEHR collimators on FDG coincidence imaging with a hybrid PET

148 systems with a high-energy, general-purpose collimator, on the other hand, are inadequate in such st

149 mera equipped with an ultra-high- resolution collimator, over the range 0-6 cm from the collimator fa

150 For particular isotopes, collimator penetration and x-ray fluorescence contribute

151 showed reduced broadening of the PSF due to collimator penetration for the PC collimator as compared

152 ne-shaped holes, which was designed to limit collimator penetration while preserving resolution and s

153 lution, count rate performance, sensitivity, collimator penetration, hardware versus object scatter,

154 on computed tomography system with a pinhole collimator (pinhole SPECT) for high-resolution cardiovas

155 d of view, ranging from 0.6 to 1 mm with the collimator plates dedicated to mouse imaging and from 1.

156 ging and from 1.2 to less than 2 mm with rat collimator plates.

157 tem comes with several types of multipinhole collimator plates.

158 Cone-beam collimators provide increased sensitivity at similar res

159 ed that although FDG-SPECT, using a HE or UH collimator, provided concordant viability information as

160 With the collimator removed, the resolving power of the optimized

161 /maximum count) showed a small dependence on collimator resolution and pixel size but was altered sig

162 ra system equipped with parallel and fanbeam collimators, respectively.

163 cross talk, attenuation, distance-dependent collimator response (DCR), and partial-volume effect.

164 maximization, incorporating corrections for collimator response and attenuation using both a uniform

165 onuclide (either (99m)Tc or (111)In) and (b) collimator response based on experimentally measured dep

166 tter correction (3 methods), depth-dependent collimator response correction (frequency-distance princ

167 the MLEM method with photon attenuation and collimator response corrections.

168 Correction for the depth-dependent collimator response improved spatial resolution from 13.

169 ation for scatter, attenuation, and variable collimator response led to significantly better performa

170 uce a patient-specific attenuation map and a collimator response model based on the body contour prod

171 The collimator response model used the coregistered CT image

172 es reconstructed without the depth-dependent collimator response model.

173 with corrections for photon attenuation and collimator response showed less background activity and

174 of corrections for scatter, depth-dependent collimator response, attenuation, and finite spatial res

175 of corrections for scatter, depth-dependent collimator response, attenuation, and finite spatial res

176 ted (AC) OSEM, and attenuation, scatter, and collimator response-corrected (ASCC) OSEM.

177 Use of the UHE collimator resulted in a large reduction in 131I penetra

178 equipped with ultra-high-resolution fanbeam collimators (scan duration = 210 min).

179 In 131I SPECT, object scatter as well as collimator scatter and penetration are significant.

180 improved our forward model by incorporating collimator septal penetration and detector scattering ef

181 accuracy of such measurements is scatter and collimator septal penetration.

182 The acquisition parameters, such as the collimator set and the radius of rotation, offer a wide

183 ed data from 1 angular view of the 9-pinhole collimator showed the expected loss of spatial resolutio

184 LEHR collimators for (99m)Tc but that the PC collimator significantly improved the contrast recovery

185 The focal line is 114 cm from the collimator surface and shifted 20 cm from the detector m

186 h at half maximum, 13.6 mm at 15 cm from the collimator surface).

187 When 10-cm from the collimator surface, the planar spatial resolutions FWHM

188 was found to be higher for the LEHR and HEGP collimators than for the PC collimator (e.g., 3.1 x 10(-

189 e therefore have investigated a multipinhole collimator that could improve the detection efficiency i

190 9 solid-state detector columns with tungsten collimators that rotate independently.

191 ents confirm both effects: with pyramids and collimator the thermal rectification is 10.9 +/- 0.8%, w

192 ng an HE collimator and that using a 511-keV collimator, the latter showed marked reduction in septal

193 With the jaws and multileaf collimator, the primary beam component of 0.5% was elimi

194 modulate the photon flux density and a slat collimator to collimate the TCT source beam in the axial

195 microscopy allows for the use of a minibeam collimator to reduce the total volume of material probed

196 of the IRRAMICE, a novel system with bespoke collimators to effectively treat small targets, within p

197 B) SPECT uses a pair of dissimilar cone-beam collimators to expand the axial field of view for brain

198 c accuracy of SPECT, with either an UH or HE collimator, to that of PET in myocardial viability studi

199 aps estimated with a line source and fanbeam collimators (transAC).

200 With the UHE collimator, typical patient images showed an improvement

201 se collimator (HE), or the dedicated 511-keV collimator (UH), when imaging 511-keV photons, and compa

202 scans by shifting the animal bed through the collimator using an automated xyz stage.

203 The SPECT imaging performance of the fanbeam collimator was also characterized.

204 le-slice prototype of the parallel-cone (PC) collimator was capable of improving the image quality of

205 The image quality of the PC collimator was quantitatively compared with that of clin

206 A "cascaded" collimator was realized with 40 times greater purity tha

207 On the basis of this comparison, the UHE collimator was selected for this investigation, which wa

208 Spatial resolution with the long-bore collimator was superior to that of a conventional large

209 Second, a prototype PC collimator was used in an experimental phantom study to

210 r half-cone beam, fan-beam and parallel-beam collimators were 5.2 (85.6), 5.1 (55.6) and 5.9 (39.7),

211 e where conventional sources have been used, collimators were employed to produce spatially coherent

212 atial resolutions and sensitivities of three collimators were measured.

213 bend with repeated holes or using multi-leaf collimators where dosimetry is uncertain.

214 s 30% poorer than that for the parallel-hole collimator, whereas the detection efficiency was increas

215 apart were separately detectable for the PC collimator, whereas this was not the case for (131)I and

216 r of the two sets of wedges on the multileaf collimator, which is closer to the patient and thus enha

217 e same spatial resolution as a parallel-hole collimator will have 5 times greater efficiency.

218 A cylindric collimator with 54 focused 2.0-mm-diameter conical pinho

219 that the spatial resolution of the 9-pinhole collimator with 8-mm diameter pinholes was 30% poorer th

220 ulations were carried out to compare the UHE collimator with a conventionally used, high-energy colli

221 A collimator with a nonuniform sensitivity function reduce

222 to which performance might be improved by a collimator with a nonuniform sensitivity profile.

223 ma-camera as a function of distance from the collimator with a point source array.

224 phantom and a high-resolution parallel-beam collimator with and without photon attenuation.

225 ally steered onto a bremsstrahlung target, a collimator with channels to create a divergent array of

226 This study investigated a parallel-hole collimator with cone-shaped holes, which was designed to

227 The combination of a multichannel collimator with diamond anvil cells enabled the measurem

228 A half-cone beam collimator with the focal point located towards the base

229 g standard low-energy high-resolution (LEHR) collimators with hybrid PET to obtain coincidence and SP

230 lf-cone beam with parallel-beam and fan-beam collimators with similar resolution characteristics for

231 ting isotopes, such as (131)I, parallel-hole collimators with thick septa are required to limit septa