Metal artifact reduction by dual energy computed tomography using monoenergetic extrapolation
Objective The aim of the study was to assess the performance and diagnostic value of a dual energy CT approach to reduce metal artefacts in subjects with metallic implants. Methods 31 patients were examined in the area of their metallic implants using a dual energy CT protocol (filtered 140 kVp and...
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| Published in | European radiology Vol. 21; no. 7; pp. 1424 - 1429 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Berlin/Heidelberg
Springer-Verlag
01.07.2011
Springer Nature B.V |
| Subjects | |
| Online Access | Get full text |
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| Abstract | Objective
The aim of the study was to assess the performance and diagnostic value of a dual energy CT approach to reduce metal artefacts in subjects with metallic implants.
Methods
31 patients were examined in the area of their metallic implants using a dual energy CT protocol (filtered 140 kVp and 100 kVp spectrum, tube current relation: 3:1). Specific post-processing was applied to generate energies of standard 120 and 140 kVp spectra as well as a filtered 140 kVp spectrum with mean photon energies of 64, 69 and 88 keV, respectively, and an optimized hard spectrum of 95–150 keV. Image quality and diagnostic value were subjectively and objectively determined.
Results
Image quality was rated superior to the standard image in 29/31 high energy reconstructions; the diagnostic value was rated superior in 27 patients. Image quality and diagnostic value scores improved significantly from 3.5 to 2.1 and from 3.6 to 1.9, respectively. In several exams decisive diagnostic features were only discernible in the high energy reconstructions. The density of the artefacts decreased from −882 to −341 HU.
Conclusions
Dual Energy CT with specific postprocessing can reduce metal artefacts and may significantly enhance diagnostic value in the evaluation of metallic implants. |
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| AbstractList | Objective: The aim of the study was to assess the performance and diagnostic value of a dual energy CT approach to reduce metal artefacts in subjects with metallic implants. Methods: 31 patients were examined in the area of their metallic implants using a dual energy CT protocol (filtered 140kVp and 100kVp spectrum, tube current relation: 3:1). Specific post-processing was applied to generate energies of standard 120 and 140kVp spectra as well as a filtered 140kVp spectrum with mean photon energies of 64, 69 and 88keV, respectively, and an optimized hard spectrum of 95-150keV. Image quality and diagnostic value were subjectively and objectively determined. Results: Image quality was rated superior to the standard image in 29/31 high energy reconstructions; the diagnostic value was rated superior in 27 patients. Image quality and diagnostic value scores improved significantly from 3.5 to 2.1 and from 3.6 to 1.9, respectively. In several exams decisive diagnostic features were only discernible in the high energy reconstructions. The density of the artefacts decreased from -882 to -341 HU. Conclusions: Dual Energy CT with specific postprocessing can reduce metal artefacts and may significantly enhance diagnostic value in the evaluation of metallic implants. The aim of the study was to assess the performance and diagnostic value of a dual energy CT approach to reduce metal artefacts in subjects with metallic implants. 31 patients were examined in the area of their metallic implants using a dual energy CT protocol (filtered 140 kVp and 100 kVp spectrum, tube current relation: 3:1). Specific post-processing was applied to generate energies of standard 120 and 140 kVp spectra as well as a filtered 140 kVp spectrum with mean photon energies of 64, 69 and 88 keV, respectively, and an optimized hard spectrum of 95-150 keV. Image quality and diagnostic value were subjectively and objectively determined. Image quality was rated superior to the standard image in 29/31 high energy reconstructions; the diagnostic value was rated superior in 27 patients. Image quality and diagnostic value scores improved significantly from 3.5 to 2.1 and from 3.6 to 1.9, respectively. In several exams decisive diagnostic features were only discernible in the high energy reconstructions. The density of the artefacts decreased from -882 to -341 HU. Dual Energy CT with specific postprocessing can reduce metal artefacts and may significantly enhance diagnostic value in the evaluation of metallic implants. The aim of the study was to assess the performance and diagnostic value of a dual energy CT approach to reduce metal artefacts in subjects with metallic implants. 31 patients were examined in the area of their metallic implants using a dual energy CT protocol (filtered 140 kVp and 100 kVp spectrum, tube current relation: 3:1). Specific post-processing was applied to generate energies of standard 120 and 140 kVp spectra as well as a filtered 140 kVp spectrum with mean photon energies of 64, 69 and 88 keV, respectively, and an optimized hard spectrum of 95-150 keV. Image quality and diagnostic value were subjectively and objectively determined. Image quality was rated superior to the standard image in 29/31 high energy reconstructions; the diagnostic value was rated superior in 27 patients. Image quality and diagnostic value scores improved significantly from 3.5 to 2.1 and from 3.6 to 1.9, respectively. In several exams decisive diagnostic features were only discernible in the high energy reconstructions. The density of the artefacts decreased from -882 to -341 HU. Dual Energy CT with specific postprocessing can reduce metal artefacts and may significantly enhance diagnostic value in the evaluation of metallic implants.[PUBLICATION ABSTRACT] Objective The aim of the study was to assess the performance and diagnostic value of a dual energy CT approach to reduce metal artefacts in subjects with metallic implants. Methods 31 patients were examined in the area of their metallic implants using a dual energy CT protocol (filtered 140 kVp and 100 kVp spectrum, tube current relation: 3:1). Specific post-processing was applied to generate energies of standard 120 and 140 kVp spectra as well as a filtered 140 kVp spectrum with mean photon energies of 64, 69 and 88 keV, respectively, and an optimized hard spectrum of 95–150 keV. Image quality and diagnostic value were subjectively and objectively determined. Results Image quality was rated superior to the standard image in 29/31 high energy reconstructions; the diagnostic value was rated superior in 27 patients. Image quality and diagnostic value scores improved significantly from 3.5 to 2.1 and from 3.6 to 1.9, respectively. In several exams decisive diagnostic features were only discernible in the high energy reconstructions. The density of the artefacts decreased from −882 to −341 HU. Conclusions Dual Energy CT with specific postprocessing can reduce metal artefacts and may significantly enhance diagnostic value in the evaluation of metallic implants. The aim of the study was to assess the performance and diagnostic value of a dual energy CT approach to reduce metal artefacts in subjects with metallic implants.OBJECTIVEThe aim of the study was to assess the performance and diagnostic value of a dual energy CT approach to reduce metal artefacts in subjects with metallic implants.31 patients were examined in the area of their metallic implants using a dual energy CT protocol (filtered 140 kVp and 100 kVp spectrum, tube current relation: 3:1). Specific post-processing was applied to generate energies of standard 120 and 140 kVp spectra as well as a filtered 140 kVp spectrum with mean photon energies of 64, 69 and 88 keV, respectively, and an optimized hard spectrum of 95-150 keV. Image quality and diagnostic value were subjectively and objectively determined.METHODS31 patients were examined in the area of their metallic implants using a dual energy CT protocol (filtered 140 kVp and 100 kVp spectrum, tube current relation: 3:1). Specific post-processing was applied to generate energies of standard 120 and 140 kVp spectra as well as a filtered 140 kVp spectrum with mean photon energies of 64, 69 and 88 keV, respectively, and an optimized hard spectrum of 95-150 keV. Image quality and diagnostic value were subjectively and objectively determined.Image quality was rated superior to the standard image in 29/31 high energy reconstructions; the diagnostic value was rated superior in 27 patients. Image quality and diagnostic value scores improved significantly from 3.5 to 2.1 and from 3.6 to 1.9, respectively. In several exams decisive diagnostic features were only discernible in the high energy reconstructions. The density of the artefacts decreased from -882 to -341 HU.RESULTSImage quality was rated superior to the standard image in 29/31 high energy reconstructions; the diagnostic value was rated superior in 27 patients. Image quality and diagnostic value scores improved significantly from 3.5 to 2.1 and from 3.6 to 1.9, respectively. In several exams decisive diagnostic features were only discernible in the high energy reconstructions. The density of the artefacts decreased from -882 to -341 HU.Dual Energy CT with specific postprocessing can reduce metal artefacts and may significantly enhance diagnostic value in the evaluation of metallic implants.CONCLUSIONSDual Energy CT with specific postprocessing can reduce metal artefacts and may significantly enhance diagnostic value in the evaluation of metallic implants. |
| Author | Bamberg, Fabian Dierks, Alexander Reiser, Maximilian F. Nikolaou, Konstantin Johnson, Thorsten R. C. Becker, Christoph R. |
| Author_xml | – sequence: 1 givenname: Fabian surname: Bamberg fullname: Bamberg, Fabian organization: Department of Clinical Radiology, Ludwig-Maximilians University – sequence: 2 givenname: Alexander surname: Dierks fullname: Dierks, Alexander organization: Department of Clinical Radiology, Ludwig-Maximilians University – sequence: 3 givenname: Konstantin surname: Nikolaou fullname: Nikolaou, Konstantin organization: Department of Clinical Radiology, Ludwig-Maximilians University – sequence: 4 givenname: Maximilian F. surname: Reiser fullname: Reiser, Maximilian F. organization: Department of Clinical Radiology, Ludwig-Maximilians University – sequence: 5 givenname: Christoph R. surname: Becker fullname: Becker, Christoph R. organization: Department of Clinical Radiology, Ludwig-Maximilians University – sequence: 6 givenname: Thorsten R. C. surname: Johnson fullname: Johnson, Thorsten R. C. email: thorsten.johnson@med.uni-muenchen.de organization: Department of Clinical Radiology, Ludwig-Maximilians University, University of Munich |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/21249370$$D View this record in MEDLINE/PubMed |
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| Cites_doi | 10.1097/RLI.0b013e3181b0a2f9 10.1148/rg.246045065 10.1016/0895-6111(94)90080-9 10.1016/j.ejrad.2008.09.017 10.1097/RLI.0b013e318157a144 10.1148/rg.273065087 10.1007/s00330-009-1358-x 10.1007/s00330-004-2263-y 10.1007/s00330-008-1213-5 10.1055/s-2002-23160 10.1007/s00330-006-0517-6 10.1007/s00330-010-1866-8 10.1097/RLI.0b013e3181e33189 |
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| References_xml | – volume: 44 start-page: 691 year: 2009 end-page: 696 ident: CR14 article-title: Metal artifact reduction from reformatted projections for hip prostheses in multislice helical computed tomography: techniques and initial clinical results publication-title: Invest Radiol doi: 10.1097/RLI.0b013e3181b0a2f9 – volume: 24 start-page: 1679 year: 2004 end-page: 1691 ident: CR1 article-title: Artifacts in CT: recognition and avoidance publication-title: Radiographics doi: 10.1148/rg.246045065 – volume: 18 start-page: 429 year: 1994 end-page: 434 ident: CR4 article-title: CT scans through metal scanning technique versus hardware composition publication-title: Comput Med Imaging Graph doi: 10.1016/0895-6111(94)90080-9 – ident: CR2 – ident: CR9 – volume: 68 start-page: 409 year: 2008 end-page: 413 ident: CR5 article-title: Evaluation of non-linear blending in dual-energy computed tomography publication-title: Eur J Radiol doi: 10.1016/j.ejrad.2008.09.017 – volume: 43 start-page: 112 year: 2008 end-page: 119 ident: CR3 article-title: Dual energy CT characterization of urinary calculi: initial in vitro and clinical experience publication-title: Invest Radiol doi: 10.1097/RLI.0b013e318157a144 – volume: 27 start-page: 791 year: 2007 end-page: 803 ident: CR8 article-title: Overcoming artifacts from metallic orthopedic implants at high-field-strength MR imaging and multi-detector CT publication-title: Radiographics doi: 10.1148/rg.273065087 – volume: 19 start-page: 2060 year: 2009 end-page: 2065 ident: CR10 article-title: Dual-energy CT head bone and hard plaque removal for quantification of calcified carotid stenosis: utility and comparison with digital subtraction angiography publication-title: Eur Radiol doi: 10.1007/s00330-009-1358-x – volume: 14 start-page: 849 year: 2004 end-page: 856 ident: CR12 article-title: A pragmatic approach to metal artifact reduction in CT: merging of metal artifact reduced images publication-title: Eur Radiol doi: 10.1007/s00330-004-2263-y – volume: 19 start-page: 1019 year: 2009 end-page: 1024 ident: CR11 article-title: Dual-energy direct bone removal CT angiography for evaluation of intracranial aneurysm or stenosis: comparison with conventional digital subtraction angiography publication-title: Eur Radiol doi: 10.1007/s00330-008-1213-5 – start-page: S201 year: 2010 ident: CR7 publication-title: Evaluation of an image-based method to calculate monoenergetic images from dual energy images(ed)^(eds) Abstract Book, European Congress of Radiology 2010 – volume: 6 start-page: 5 year: 2002 end-page: 17 ident: CR13 article-title: Technical considerations: CT and MR imaging in the postoperative orthopedic patient publication-title: Semin Musculoskelet Radiol doi: 10.1055/s-2002-23160 – volume: 17 start-page: 1510 year: 2007 end-page: 1517 ident: CR6 article-title: Material differentiation by dual energy CT: initial experience publication-title: Eur Radiol doi: 10.1007/s00330-006-0517-6 – volume: 19 start-page: 1019 year: 2009 ident: 2062_CR11 publication-title: Eur Radiol doi: 10.1007/s00330-008-1213-5 – ident: 2062_CR9 doi: 10.1007/s00330-010-1866-8 – volume: 6 start-page: 5 year: 2002 ident: 2062_CR13 publication-title: Semin Musculoskelet Radiol doi: 10.1055/s-2002-23160 – volume: 68 start-page: 409 year: 2008 ident: 2062_CR5 publication-title: Eur J Radiol doi: 10.1016/j.ejrad.2008.09.017 – volume: 18 start-page: 429 year: 1994 ident: 2062_CR4 publication-title: Comput Med Imaging Graph doi: 10.1016/0895-6111(94)90080-9 – volume: 19 start-page: 2060 year: 2009 ident: 2062_CR10 publication-title: Eur Radiol doi: 10.1007/s00330-009-1358-x – volume: 44 start-page: 691 year: 2009 ident: 2062_CR14 publication-title: Invest Radiol doi: 10.1097/RLI.0b013e3181b0a2f9 – volume: 24 start-page: 1679 year: 2004 ident: 2062_CR1 publication-title: Radiographics doi: 10.1148/rg.246045065 – volume: 27 start-page: 791 year: 2007 ident: 2062_CR8 publication-title: Radiographics doi: 10.1148/rg.273065087 – volume: 14 start-page: 849 year: 2004 ident: 2062_CR12 publication-title: Eur Radiol doi: 10.1007/s00330-004-2263-y – ident: 2062_CR2 doi: 10.1097/RLI.0b013e3181e33189 – volume: 43 start-page: 112 year: 2008 ident: 2062_CR3 publication-title: Invest Radiol doi: 10.1097/RLI.0b013e318157a144 – start-page: S201 volume-title: Evaluation of an image-based method to calculate monoenergetic images from dual energy images(ed)^(eds) Abstract Book, European Congress of Radiology 2010 year: 2010 ident: 2062_CR7 – volume: 17 start-page: 1510 year: 2007 ident: 2062_CR6 publication-title: Eur Radiol doi: 10.1007/s00330-006-0517-6 |
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| Title | Metal artifact reduction by dual energy computed tomography using monoenergetic extrapolation |
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