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Volumn 16, Issue 2, 2009, Pages 255-276

Advances in technical aspects of myocardial perfusion SPECT imaging

Author keywords

[No Author keywords available]

Indexed keywords

ALGORITHM; ARTICLE; ARTIFACT; CLINICAL PRACTICE; COLLIMATOR; COMPUTED TOMOGRAPHIC ANGIOGRAPHY; DEVICE; HEART MUSCLE PERFUSION; HUMAN; IMAGE PROCESSING; IMAGE QUALITY; IMAGE RECONSTRUCTION; PRIORITY JOURNAL; RADIATION DOSE; SCINTILLATION CAMERA; SENSITIVITY AND SPECIFICITY; SINGLE PHOTON EMISSION COMPUTER TOMOGRAPHY; TIME; CARDIOLOGY; HEART LEFT VENTRICLE FUNCTION; INSTRUMENTATION; METHODOLOGY; NUCLEAR MEDICINE; REVIEW; SCINTISCANNING;

EID: 67649994709     PISSN: 10713581     EISSN: None     Source Type: Journal    
DOI: 10.1007/s12350-009-9052-6     Document Type: Article
Times cited : (232)

References (57)
  • 1
    • 38049151278 scopus 로고    scopus 로고
    • Applications and software techniques for integrated cardiac multimodality imaging
    • Slomka PJ, Berman DS, Germano G. Applications and software techniques for integrated cardiac multimodality imaging. Expert Rev Cardiovasc Ther 2008;6:27-41.
    • (2008) Expert Rev Cardiovasc Ther , vol.6 , pp. 27-41
    • Slomka, P.J.1    Berman, D.S.2    Germano, G.3
  • 2
    • 34447558140 scopus 로고    scopus 로고
    • Estimating risk of cancer associated with radiation exposure from 64-slice computed tomography coronary angiography
    • Einstein AJ, Henzlova MJ, Rajagopalan S. Estimating risk of cancer associated with radiation exposure from 64-slice computed tomography coronary angiography. JAMA 2007;298:317-23.
    • (2007) JAMA , vol.298 , pp. 317-323
    • Einstein, A.J.1    Henzlova, M.J.2    Rajagopalan, S.3
  • 3
    • 33750710443 scopus 로고    scopus 로고
    • A triple-head solid state camera for cardiac single photon emission tomography (SPECT)
    • In: Franks LA, Burger A, James RB, Barber HB, Doty FP, Roehrig H, editors
    • Babla H, Bai C, Conwell R. A triple-head solid state camera for cardiac single photon emission tomography (SPECT). In: Franks LA, Burger A, James RB, Barber HB, Doty FP, Roehrig H, editors. Proceedings of the SPIE. vol. 6319. 2005. p. 63190M.
    • (2005) Proceedings of the SPIE , vol.6319
    • Babla, H.1    Bai, C.2    Conwell, R.3
  • 4
    • 70249131456 scopus 로고    scopus 로고
    • A clinical comparison of an upright triple-head digital detector system to a standard supine dual-head gamma camera (abstract)
    • Lewin HC, Hyun MC. A clinical comparison of an upright triple-head digital detector system to a standard supine dual-head gamma camera (abstract). J Nucl Cardiol 2005;12:113-113.
    • (2005) J Nucl Cardiol , vol.12 , pp. 113
    • Lewin, H.C.1    Hyun, M.C.2
  • 6
    • 62549091590 scopus 로고    scopus 로고
    • Prospective multi-center evaluation of rapid gated SPECT myocardial perfusion upright imaging (abstract)
    • Maddahi J, Mahmarian J, Mendez R, et al. Prospective multi-center evaluation of rapid gated SPECT myocardial perfusion upright imaging (abstract). J Nucl Med 2008;49:2P.
    • (2008) J Nucl Med , vol.49
    • Maddahi, J.1    Mahmarian, J.2    Mendez, R.3
  • 7
    • 70249119965 scopus 로고    scopus 로고
    • Accessed 30 May
    • www.CardiArc.com. Accessed 30 May 2008.
    • (2008)
  • 8
    • 34248594155 scopus 로고    scopus 로고
    • Recent advances in SPECT imaging
    • Madsen MT. Recent advances in SPECT imaging. J Nucl Med 2007;48:661-73.
    • (2007) J Nucl Med , vol.48 , pp. 661-673
    • Madsen, M.T.1
  • 9
    • 0030263209 scopus 로고    scopus 로고
    • Room temperature semiconductor detectors for safeguards measurements
    • Arlt R, Rundquist DE. Room temperature semiconductor detectors for safeguards measurements. Nucl Instrum Methods Phys Res A 1996;380:455-61.
    • (1996) Nucl Instrum Methods Phys Res A , vol.380 , pp. 455-461
    • Arlt, R.1    Rundquist, D.E.2
  • 10
    • 70249098808 scopus 로고    scopus 로고
    • Evaluation of the CardiArc dedicated cardiac system
    • (unpublished independent evaluation). Rochester, MN: Mayo Clinic
    • O'Connor M. Evaluation of the CardiArc dedicated cardiac system (unpublished independent evaluation). Rochester, MN: Mayo Clinic; 2005.
    • (2005)
    • O'Connor, M.1
  • 11
    • 41249099375 scopus 로고    scopus 로고
    • High-speed myocardial perfusion imaging Initial clinical comparison with conventional dual detector anger camera imaging
    • Sharir T, Ben-Haim S, Merzon K, et al. High-speed myocardial perfusion imaging Initial clinical comparison with conventional dual detector anger camera imaging. J Am Coll Cardiol Cardiovasc Imaging 2008;1:156-63.
    • (2008) J Am Coll Cardiol Cardiovasc Imaging , vol.1 , pp. 156-163
    • Sharir, T.1    Ben-Haim, S.2    Merzon, K.3
  • 12
    • 70249134557 scopus 로고    scopus 로고
    • Spectrum Dynamics LLC, assignee. Multi-dimensional image reconstruction
    • US patent 7176466. 13 Feb
    • Rousso B, Nagler M. Spectrum Dynamics LLC, assignee. Multi-dimensional image reconstruction. US patent 7176466. 13 Feb 2007.
    • (2007)
    • Rousso, B.1    Nagler, M.2
  • 13
    • 0032917575 scopus 로고    scopus 로고
    • Recommendations for implementing SPECT instrumentation quality control
    • Hines H, Kayayan R, Colsher J, et al. Recommendations for implementing SPECT instrumentation quality control. Eur J Nucl Med Mol Imaging 1999;26:527-32.
    • (1999) Eur J Nucl Med Mol Imaging , vol.26 , pp. 527-532
    • Hines, H.1    Kayayan, R.2    Colsher, J.3
  • 14
    • 33846564387 scopus 로고    scopus 로고
    • D-SPECT: A new solid state camera for high speed molecular imaging
    • Patton J, Sandler M, Berman D, et al. D-SPECT: A new solid state camera for high speed molecular imaging. Soc Nuclear Med 2006;47:189.
    • (2006) Soc Nuclear Med , vol.47 , pp. 189
    • Patton, J.1    Sandler, M.2    Berman, D.3
  • 15
    • 62549165301 scopus 로고    scopus 로고
    • Simultaneous dual isotope myocardial perfusion scintigraphy (DI MPS) - Initial experience with fast D-SPECT (abstract)
    • Ben-Haim S, Hutton B, Van Gramberg D, et al. Simultaneous dual isotope myocardial perfusion scintigraphy (DI MPS) - Initial experience with fast D-SPECT (abstract). J Nucl Cardiol 2008;15:S2.
    • (2008) J Nucl Cardiol , vol.15
    • Ben-Haim, S.1    Hutton, B.2    Van Gramberg, D.3
  • 16
    • 70249096599 scopus 로고    scopus 로고
    • Stress thallium-201/rest Tc-99m sequential dual isotope high-speed myocardial perfusion imaging
    • SW H
    • Berman D, SW H, Wolak A, et al. Stress thallium-201/rest Tc-99m sequential dual isotope high-speed myocardial perfusion imaging. Circulation 2008;118:S1010.
    • (2008) Circulation , vol.118
    • Berman, D.1    Wolak, A.2
  • 17
    • 62549126128 scopus 로고    scopus 로고
    • Validation of quantitative analysis of high-speed myocardial perfusion imaging: Comparison to conventional SPECT imaging (abstract)
    • Sharir T, Ben Haim S, Slomka PJ, et al. Validation of quantitative analysis of high-speed myocardial perfusion imaging: Comparison to conventional SPECT imaging (abstract). J Nucl Cardiol 2008;15:S4.
    • (2008) J Nucl Cardiol , vol.15
    • Sharir, T.1    Ben Haim, S.2    Slomka, P.J.3
  • 18
    • 0028297899 scopus 로고
    • Pinhole collimation for ultra-high-resolution, small-field-of-view SPECT
    • Jaszczak RJ, Li J, Wang H, Zalutsky MR, Coleman RE. Pinhole collimation for ultra-high-resolution, small-field-of-view SPECT. Phys Med Biol 1994;39:425-37.
    • (1994) Phys Med Biol , vol.39 , pp. 425-437
    • Jaszczak, R.J.1    Li, J.2    Wang, H.3    Zalutsky, M.R.4    Coleman, R.E.5
  • 20
    • 5744242293 scopus 로고    scopus 로고
    • Design and simulation of a high-resolution stationary SPECT system for small animals
    • Beekman FJ, Vastenhouw B. Design and simulation of a high-resolution stationary SPECT system for small animals. Phys Med Biol 2004;49:4579-92.
    • (2004) Phys Med Biol , vol.49 , pp. 4579-4592
    • Beekman, F.J.1    Vastenhouw, B.2
  • 21
    • 33745062316 scopus 로고    scopus 로고
    • A novel approach to multipinhole SPECT for myocardial perfusion imaging
    • Funk T, Kirch DL, Koss JE, Botvinick E, Hasegawa BH. A novel approach to multipinhole SPECT for myocardial perfusion imaging. J Nucl Med 2006;47:595-602.
    • (2006) J Nucl Med , vol.47 , pp. 595-602
    • Funk, T.1    Kirch, D.L.2    Koss, J.E.3    Botvinick, E.4    Hasegawa, B.H.5
  • 23
    • 33646448140 scopus 로고    scopus 로고
    • A multipinhole small animal SPECT system with submillimeter spatial resolution
    • Funk T, Després P, Barber WC, Shah KS, Hasegawa BH. A multipinhole small animal SPECT system with submillimeter spatial resolution. Med Phys 2006;33:1259-68.
    • (2006) Med Phys , vol.33 , pp. 1259-1268
    • Funk, T.1    Després, P.2    Barber, W.C.3    Shah, K.S.4    Hasegawa, B.H.5
  • 24
    • 46749121055 scopus 로고    scopus 로고
    • Comparison of simultaneous dual-isotope multipinhole SPECT with rotational SPECT in a group of patients with coronary artery disease
    • Steele PP, Kirch DL, Koss JE. Comparison of simultaneous dual-isotope multipinhole SPECT with rotational SPECT in a group of patients with coronary artery disease. J Nucl Med 2008;49:1080.
    • (2008) J Nucl Med , vol.49 , pp. 1080
    • Steele, P.P.1    Kirch, D.L.2    Koss, J.E.3
  • 27
    • 62549137960 scopus 로고    scopus 로고
    • 2.05: A new solid state, ultra fast cardiac multi-detector SPECT system
    • Garcia EV, Tsukerman L, Keidar Z. 2.05: A new solid state, ultra fast cardiac multi-detector SPECT system. J Nucl Cardiol 2008;15:S3-S3.
    • (2008) J Nucl Cardiol , vol.15
    • Garcia, E.V.1    Tsukerman, L.2    Keidar, Z.3
  • 28
    • 0028300219 scopus 로고
    • The cardiofocal collimator: A variable focus collimator for cardiac SPECT
    • Hawman PC, Haines EJ. The cardiofocal collimator: A variable focus collimator for cardiac SPECT. Phys Med Biol 1994;39:439-50.
    • (1994) Phys Med Biol , vol.39 , pp. 439-450
    • Hawman, P.C.1    Haines, E.J.2
  • 29
    • 11844304121 scopus 로고    scopus 로고
    • Analysis of a SPECT OSEM reconstruction method with 3D beam modeling and optional attenuation correction: Phantom studies
    • Paper presented at
    • Vija A, Hawman E, Engdahl J. Analysis of a SPECT OSEM reconstruction method with 3D beam modeling and optional attenuation correction: Phantom studies. Paper presented at IEEE nuclear science symposium and medical imaging conference, 2003.
    • (2003) IEEE Nuclear Science Symposium and Medical Imaging Conference
    • Vija, A.1    Hawman, E.2    Engdahl, J.3
  • 30
    • 33645083974 scopus 로고    scopus 로고
    • Isotropic reconstruction of SPECT data using OSEM3D: Correlation with CT
    • Römer W, Reichel N, Vija HA, et al. Isotropic reconstruction of SPECT data using OSEM3D: Correlation with CT. Acad Radiol 2006;13:496-502.
    • (2006) Acad Radiol , vol.13 , pp. 496-502
    • Römer, W.1    Reichel, N.2    Vija, H.A.3
  • 31
    • 84861100818 scopus 로고    scopus 로고
    • IQ•SPECT technology white paper. Siemens Medical Solutions, USA
    • Vija H, Chapman J, Ray M. IQ•SPECT technology white paper. Siemens Medical Solutions, USA. Mol Imaging 2008;1-7.
    • (2008) Mol Imaging , pp. 1-7
    • Vija, H.1    Chapman, J.2    Ray, M.3
  • 32
    • 0020194763 scopus 로고
    • Maximum likelihood reconstruction for emission tomography
    • Shepp LA, Vardi Y. Maximum likelihood reconstruction for emission tomography. IEEE Trans Med Imaging 1982;1:113-22.
    • (1982) IEEE Trans Med Imaging , vol.1 , pp. 113-122
    • Shepp, L.A.1    Vardi, Y.2
  • 33
    • 0021327145 scopus 로고
    • EM reconstruction algorithms for emission and transmission tomography
    • Lange K, Carson R. EM reconstruction algorithms for emission and transmission tomography. J Comput Assist Tomogr 1984;8:306-16.
    • (1984) J Comput Assist Tomogr , vol.8 , pp. 306-316
    • Lange, K.1    Carson, R.2
  • 34
    • 0028700063 scopus 로고
    • Accelerated image reconstruction using ordered subsets of projection data
    • Hudson HM, Larkin RS. Accelerated image reconstruction using ordered subsets of projection data. IEEE Trans Med Imaging 1994;13:601-9.
    • (1994) IEEE Trans Med Imaging , vol.13 , pp. 601-609
    • Hudson, H.M.1    Larkin, R.S.2
  • 35
    • 0033844081 scopus 로고    scopus 로고
    • Relative impact of scatter, collimator response, attenuation, and finite spatial resolution corrections in cardiac SPECT
    • El Fakhri G, Buvat I, Benali H, Todd-Pokropek A, Di Paola R. Relative impact of scatter, collimator response, attenuation, and finite spatial resolution corrections in cardiac SPECT. J Nucl Med 2000;41:1400-8.
    • (2000) J Nucl Med , vol.41 , pp. 1400-1408
    • El Fakhri, G.1    Buvat, I.2    Benali, H.3    Todd-Pokropek, A.4    Di Paola, R.5
  • 36
    • 0019136137 scopus 로고
    • The geometric transfer function component for scintillation camera collimators with straight parallel holes
    • Metz CE. The geometric transfer function component for scintillation camera collimators with straight parallel holes. Phys Med Biol 1980;25:1059-70.
    • (1980) Phys Med Biol , vol.25 , pp. 1059-1070
    • Metz, C.E.1
  • 37
    • 0031980980 scopus 로고    scopus 로고
    • Fast implementation of reconstruction-based scatter compensation in fully 3D SPECT image reconstruction
    • Kadrmas DJ, Frey EC, Karimi SS, Tsui BMW. Fast implementation of reconstruction-based scatter compensation in fully 3D SPECT image reconstruction. Phys Med Biol 1998;43:857-73.
    • (1998) Phys Med Biol , vol.43 , pp. 857-873
    • Kadrmas, D.J.1    Frey, E.C.2    Karimi, S.S.3    Tsui, B.M.W.4
  • 39
    • 70249143917 scopus 로고    scopus 로고
    • Iterative reconstruction with enhanced noise control filtering
    • WO patent WO/2007/034,342
    • Ye J, Shao L, Zhao Z, Durbin M. Iterative reconstruction with enhanced noise control filtering. WO patent WO/2007/034,342; 2007.
    • (2007)
    • Ye, J.1    Shao, L.2    Zhao, Z.3    Durbin, M.4
  • 40
    • 0035284535 scopus 로고    scopus 로고
    • Image filtering in single-photon emission computed tomography: Principles and applications
    • Van Laere K, Koole M, Lemahieu I, Dierckx R. Image filtering in single-photon emission computed tomography: Principles and applications. Comput Med Imaging Graph 2001;25:127-33.
    • (2001) Comput Med Imaging Graph , vol.25 , pp. 127-133
    • Van Laere, K.1    Koole, M.2    Lemahieu, I.3    Dierckx, R.4
  • 41
    • 62549098721 scopus 로고    scopus 로고
    • Enhancement of nuclear cardiac laboratory efficiency - Multicenter evaluation of a new post-processing method with depth-dependent collimator resolution applied to full and half-time acquisitions
    • Venero CV, Ahlberg AW, Bateman TM, et al. Enhancement of nuclear cardiac laboratory efficiency - Multicenter evaluation of a new post-processing method with depth-dependent collimator resolution applied to full and half-time acquisitions. J Nucl Cardiol 2008;15:S4.
    • (2008) J Nucl Cardiol , vol.15
    • Venero, C.V.1    Ahlberg, A.W.2    Bateman, T.M.3
  • 42
    • 70249086555 scopus 로고    scopus 로고
    • 2.04: Multicenter investigation comparing a highly efficient half-time stress-only attenuation correction approach against standard rest-stress Tc-99m SPECT imaging
    • Bateman TM, Heller GV, McGhie AI, et al. 2.04: Multicenter investigation comparing a highly efficient half-time stress-only attenuation correction approach against standard rest-stress Tc-99m SPECT imaging. J Nucl Cardiol 2008;15:S3-S3.
    • (2008) J Nucl Cardiol , vol.15
    • Bateman, T.M.1    Heller, G.V.2    McGhie, A.I.3
  • 43
    • 0001579739 scopus 로고
    • Implementation of simultaneous attenuation and detector response correction in SPECT
    • Tsui BMW, Hu HB, Gilland DR, Gullberg GT. Implementation of simultaneous attenuation and detector response correction in SPECT. IEEE Trans Nucl Sci 1988;35:778-83.
    • (1988) IEEE Trans Nucl Sci , vol.35 , pp. 778-783
    • Tsui, B.M.W.1    Hu, H.B.2    Gilland, D.R.3    Gullberg, G.T.4
  • 44
    • 47949091363 scopus 로고    scopus 로고
    • OSEM and wide beam reconstruction (WBR) "half-time" gated myocardial perfusion SPECT functional imaging: A comparison to "full-time" filtered back projection
    • DePuey E, Gadiraju R, Clark J, Thompson L, Anstett F, Shwartz S. OSEM and wide beam reconstruction (WBR) "half-time" gated myocardial perfusion SPECT functional imaging: A comparison to "full-time" filtered back projection. J Nucl Cardiol 2008;15:547-63.
    • (2008) J Nucl Cardiol , vol.15 , pp. 547-563
    • DePuey, E.1    Gadiraju, R.2    Clark, J.3    Thompson, L.4    Anstett, F.5    Shwartz, S.6
  • 45
    • 0025070160 scopus 로고
    • The geometric transfer-function for cone and fan beam collimators
    • Tsui BMW, Gullberg GT. The geometric transfer-function for cone and fan beam collimators. Phys Med Biol 1990;35:81-93.
    • (1990) Phys Med Biol , vol.35 , pp. 81-93
    • Tsui, B.M.W.1    Gullberg, G.T.2
  • 47
    • 0036788460 scopus 로고    scopus 로고
    • Analytic and iterative reconstruction algorithms in SPECT
    • Bruyant PP. Analytic and iterative reconstruction algorithms in SPECT. J Nucl Med 2002;43:1343-58.
    • (2002) J Nucl Med , vol.43 , pp. 1343-1358
    • Bruyant, P.P.1
  • 48
    • 0025404969 scopus 로고
    • Bayesian reconstructions from emission tomography data using a modified EM algorithm
    • Green PJ. Bayesian reconstructions from emission tomography data using a modified EM algorithm. IEEE Trans Med Imaging 1990;9:84-93.
    • (1990) IEEE Trans Med Imaging , vol.9 , pp. 84-93
    • Green, P.J.1
  • 49
    • 0030978277 scopus 로고    scopus 로고
    • Bayesian image reconstruction for emission tomography based on median root prior
    • Alenius S, Ruotsalainen U. Bayesian image reconstruction for emission tomography based on median root prior. Eur J Nucl Med Mol Imaging 1997;24:258-65.
    • (1997) Eur J Nucl Med Mol Imaging , vol.24 , pp. 258-265
    • Alenius, S.1    Ruotsalainen, U.2
  • 51
    • 62549137096 scopus 로고    scopus 로고
    • 15.34: Effect of reconstruction parameters and acquisition times on myocardial perfusion distribution in normals
    • Ficaro EP, Kritzman JN, Corbett JR. 15.34: Effect of reconstruction parameters and acquisition times on myocardial perfusion distribution in normals. J Nucl Cardiol 2008;15:S20-S20.
    • (2008) J Nucl Cardiol , vol.15
    • Ficaro, E.P.1    Kritzman, J.N.2    Corbett, J.R.3
  • 52
    • 48149099414 scopus 로고    scopus 로고
    • Estimation accuracy of ejection fraction in gated cardiac SPECT/CT imaging using iterative reconstruction with 3D resolution recovery in rapid acquisition protocols
    • Zeintl J, Ding X, Vija AH, Hawman EG, Hornegger J, Kuwert T. Estimation accuracy of ejection fraction in gated cardiac SPECT/CT imaging using iterative reconstruction with 3D resolution recovery in rapid acquisition protocols. 2007 NSS '07 IEEE Nucl Sci Symp Conf Rec 2007;6:4491-6.
    • (2007) 2007 NSS '07 IEEE Nucl Sci Symp Conf Rec , vol.6 , pp. 4491-4496
    • Zeintl, J.1    Ding, X.2    Vija, A.H.3    Hawman, E.G.4    Hornegger, J.5    Kuwert, T.6
  • 53
    • 70249139824 scopus 로고    scopus 로고
    • Accessed 6 Sept
    • Ultraspect. www.UltraSPECT.com. Accessed 6 Sept 2008.
    • (2008) Ultraspect
  • 54
    • 34547418771 scopus 로고    scopus 로고
    • Clinical results of a novel wide beam reconstruction method for shortening scan time of Tc-99m cardiac SPECT perfusion studies
    • Borges-Neto SPR, Shaw LK, et al. Clinical results of a novel wide beam reconstruction method for shortening scan time of Tc-99m cardiac SPECT perfusion studies. J Nucl Cardiol 2007;14:555-65.
    • (2007) J Nucl Cardiol , vol.14 , pp. 555-565
    • Borges-Neto, S.P.R.1    Shaw, L.K.2
  • 55
    • 70249129728 scopus 로고    scopus 로고
    • 2.01: Quarter-time myocardial perfusion SPECT wide beam reconstruction
    • DePuey EG, Bommireddipalli S, Beletsky I, et al. 2.01: Quarter-time myocardial perfusion SPECT wide beam reconstruction. J Nucl Cardiol 2008;15:S2-S2.
    • (2008) J Nucl Cardiol , vol.15
    • DePuey, E.G.1    Bommireddipalli, S.2    Beletsky, I.3
  • 56
    • 4043174855 scopus 로고    scopus 로고
    • "Motion-frozen" display and quantification of myocardial perfusion
    • Slomka PJ, Nishina H, Berman DS, et al. "Motion-frozen" display and quantification of myocardial perfusion. J Nucl Med 2004;45:1128-34.
    • (2004) J Nucl Med , vol.45 , pp. 1128-1134
    • Slomka, P.J.1    Nishina, H.2    Berman, D.S.3
  • 57
    • 46749084307 scopus 로고    scopus 로고
    • Motion-frozen myocardial perfusion SPECT improves detection of coronary artery disease in obese patients
    • Suzuki Y, Slomka PJ, Wolak A, et al. Motion-frozen myocardial perfusion SPECT improves detection of coronary artery disease in obese patients. J Nucl Med 2008;49:1075-9.
    • (2008) J Nucl Med , vol.49 , pp. 1075-1079
    • Suzuki, Y.1    Slomka, P.J.2    Wolak, A.3


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