Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose
Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identifi...
Ausführliche Beschreibung
Autor*in: |
Kamiya, Kouhei [verfasserIn] |
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E-Artikel |
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Sprache: |
Englisch |
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2013 |
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Anmerkung: |
© Japan Radiological Society 2013 |
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Übergeordnetes Werk: |
Enthalten in: Radiation medicine - Tokyo : Springer, 1999, 31(2013), 4 vom: 14. Feb., Seite 293-298 |
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Übergeordnetes Werk: |
volume:31 ; year:2013 ; number:4 ; day:14 ; month:02 ; pages:293-298 |
Links: |
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DOI / URN: |
10.1007/s11604-013-0185-9 |
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Katalog-ID: |
SPR021035032 |
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245 | 1 | 0 | |a Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose |
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520 | |a Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. | ||
650 | 4 | |a Dual-energy CT |7 (dpeaa)DE-He213 | |
650 | 4 | |a Fast kVp switching |7 (dpeaa)DE-He213 | |
650 | 4 | |a Radiation dose |7 (dpeaa)DE-He213 | |
650 | 4 | |a Virtual monochromatic imaging |7 (dpeaa)DE-He213 | |
700 | 1 | |a Kunimatsu, Akira |4 aut | |
700 | 1 | |a Mori, Harushi |4 aut | |
700 | 1 | |a Sato, Jiro |4 aut | |
700 | 1 | |a Akahane, Masaaki |4 aut | |
700 | 1 | |a Yamakawa, Takana |4 aut | |
700 | 1 | |a Ohtomo, Kuni |4 aut | |
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10.1007/s11604-013-0185-9 doi (DE-627)SPR021035032 (SPR)s11604-013-0185-9-e DE-627 ger DE-627 rakwb eng Kamiya, Kouhei verfasserin aut Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Japan Radiological Society 2013 Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. Dual-energy CT (dpeaa)DE-He213 Fast kVp switching (dpeaa)DE-He213 Radiation dose (dpeaa)DE-He213 Virtual monochromatic imaging (dpeaa)DE-He213 Kunimatsu, Akira aut Mori, Harushi aut Sato, Jiro aut Akahane, Masaaki aut Yamakawa, Takana aut Ohtomo, Kuni aut Enthalten in Radiation medicine Tokyo : Springer, 1999 31(2013), 4 vom: 14. Feb., Seite 293-298 (DE-627)368312305 (DE-600)2117284-5 1862-5274 nnns volume:31 year:2013 number:4 day:14 month:02 pages:293-298 https://dx.doi.org/10.1007/s11604-013-0185-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 31 2013 4 14 02 293-298 |
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10.1007/s11604-013-0185-9 doi (DE-627)SPR021035032 (SPR)s11604-013-0185-9-e DE-627 ger DE-627 rakwb eng Kamiya, Kouhei verfasserin aut Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Japan Radiological Society 2013 Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. Dual-energy CT (dpeaa)DE-He213 Fast kVp switching (dpeaa)DE-He213 Radiation dose (dpeaa)DE-He213 Virtual monochromatic imaging (dpeaa)DE-He213 Kunimatsu, Akira aut Mori, Harushi aut Sato, Jiro aut Akahane, Masaaki aut Yamakawa, Takana aut Ohtomo, Kuni aut Enthalten in Radiation medicine Tokyo : Springer, 1999 31(2013), 4 vom: 14. Feb., Seite 293-298 (DE-627)368312305 (DE-600)2117284-5 1862-5274 nnns volume:31 year:2013 number:4 day:14 month:02 pages:293-298 https://dx.doi.org/10.1007/s11604-013-0185-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 31 2013 4 14 02 293-298 |
allfields_unstemmed |
10.1007/s11604-013-0185-9 doi (DE-627)SPR021035032 (SPR)s11604-013-0185-9-e DE-627 ger DE-627 rakwb eng Kamiya, Kouhei verfasserin aut Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Japan Radiological Society 2013 Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. Dual-energy CT (dpeaa)DE-He213 Fast kVp switching (dpeaa)DE-He213 Radiation dose (dpeaa)DE-He213 Virtual monochromatic imaging (dpeaa)DE-He213 Kunimatsu, Akira aut Mori, Harushi aut Sato, Jiro aut Akahane, Masaaki aut Yamakawa, Takana aut Ohtomo, Kuni aut Enthalten in Radiation medicine Tokyo : Springer, 1999 31(2013), 4 vom: 14. Feb., Seite 293-298 (DE-627)368312305 (DE-600)2117284-5 1862-5274 nnns volume:31 year:2013 number:4 day:14 month:02 pages:293-298 https://dx.doi.org/10.1007/s11604-013-0185-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 31 2013 4 14 02 293-298 |
allfieldsGer |
10.1007/s11604-013-0185-9 doi (DE-627)SPR021035032 (SPR)s11604-013-0185-9-e DE-627 ger DE-627 rakwb eng Kamiya, Kouhei verfasserin aut Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Japan Radiological Society 2013 Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. Dual-energy CT (dpeaa)DE-He213 Fast kVp switching (dpeaa)DE-He213 Radiation dose (dpeaa)DE-He213 Virtual monochromatic imaging (dpeaa)DE-He213 Kunimatsu, Akira aut Mori, Harushi aut Sato, Jiro aut Akahane, Masaaki aut Yamakawa, Takana aut Ohtomo, Kuni aut Enthalten in Radiation medicine Tokyo : Springer, 1999 31(2013), 4 vom: 14. Feb., Seite 293-298 (DE-627)368312305 (DE-600)2117284-5 1862-5274 nnns volume:31 year:2013 number:4 day:14 month:02 pages:293-298 https://dx.doi.org/10.1007/s11604-013-0185-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 31 2013 4 14 02 293-298 |
allfieldsSound |
10.1007/s11604-013-0185-9 doi (DE-627)SPR021035032 (SPR)s11604-013-0185-9-e DE-627 ger DE-627 rakwb eng Kamiya, Kouhei verfasserin aut Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Japan Radiological Society 2013 Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. Dual-energy CT (dpeaa)DE-He213 Fast kVp switching (dpeaa)DE-He213 Radiation dose (dpeaa)DE-He213 Virtual monochromatic imaging (dpeaa)DE-He213 Kunimatsu, Akira aut Mori, Harushi aut Sato, Jiro aut Akahane, Masaaki aut Yamakawa, Takana aut Ohtomo, Kuni aut Enthalten in Radiation medicine Tokyo : Springer, 1999 31(2013), 4 vom: 14. Feb., Seite 293-298 (DE-627)368312305 (DE-600)2117284-5 1862-5274 nnns volume:31 year:2013 number:4 day:14 month:02 pages:293-298 https://dx.doi.org/10.1007/s11604-013-0185-9 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 AR 31 2013 4 14 02 293-298 |
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Enthalten in Radiation medicine 31(2013), 4 vom: 14. Feb., Seite 293-298 volume:31 year:2013 number:4 day:14 month:02 pages:293-298 |
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Kamiya, Kouhei @@aut@@ Kunimatsu, Akira @@aut@@ Mori, Harushi @@aut@@ Sato, Jiro @@aut@@ Akahane, Masaaki @@aut@@ Yamakawa, Takana @@aut@@ Ohtomo, Kuni @@aut@@ |
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Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). 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Kamiya, Kouhei misc Dual-energy CT misc Fast kVp switching misc Radiation dose misc Virtual monochromatic imaging Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose |
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Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose Dual-energy CT (dpeaa)DE-He213 Fast kVp switching (dpeaa)DE-He213 Radiation dose (dpeaa)DE-He213 Virtual monochromatic imaging (dpeaa)DE-He213 |
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Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose |
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preliminary report on virtual monochromatic spectral imaging with fast kvp switching dual energy head ct: comparable image quality to that of 120-kvp ct without increasing the radiation dose |
title_auth |
Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose |
abstract |
Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. © Japan Radiological Society 2013 |
abstractGer |
Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. © Japan Radiological Society 2013 |
abstract_unstemmed |
Purpose This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose. Materials and methods We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray–white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as $ CNR^{2} $/$ CTDI_{vol} $, was used to quantify image quality improvement per exposure risk. Results The mean $ CTDI_{vol} $ was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significantly greater for simulated 65-keV images (P = .03). Conclusion Our results indicate that virtual monochromatic imaging possibly provides comparable image quality to that afforded by 120-kVp SECT without increasing the dose in routine head CT. © Japan Radiological Society 2013 |
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Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose |
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FOM was significantly greater for simulated 65-keV images (P = .03). 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