Utility of dual-energy CT virtual keV monochromatic series for the assessment of spinal transpedicular hardware-bone interface
Our aim was to evaluate the utility of dual-energy CT (DECT) virtual kilo-electron volt (keV) monochromatic images for the visualization of the transpedicular screw-bone interface after spinal fusion. This retrospective study included postfusion spine CT studies performed from October 2011 through A...
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| Veröffentlicht in: | American journal of roentgenology (1976) 2013-10, Vol.201 (4), p.878-883 |
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| container_title | American journal of roentgenology (1976) |
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| creator | Srinivasan, Ashok Hoeffner, Ellen Ibrahim, Mohannad Shah, Gaurang V LaMarca, Frank Mukherji, Suresh K |
| description | Our aim was to evaluate the utility of dual-energy CT (DECT) virtual kilo-electron volt (keV) monochromatic images for the visualization of the transpedicular screw-bone interface after spinal fusion.
This retrospective study included postfusion spine CT studies performed from October 2011 through April 2012 on a dual-energy 64-MDCT unit (Discovery CT750 HD). Studies were postprocessed on an Advantage Windows workstation (version 4.4) by two neuroradiologists with creation of monochromatic images from 40 to 140 keV. Each reader graded the screw-bone interfaces on the 70-keV images (used for clinical interpretation) and on the monochromatic series using a 5-point scale (1 [uninterpretable] to 5 [excellent]). The grades of the interfaces were compared using the Wilcoxon signed rank test to detect differences between the 70-keV image and the monochromatic series.
Ninety-two transpedicular screws in 10 patients were studied. Significant improvement in the visibility of the hardware-bone interface was seen on the monochromatic series compared with the 70-keV images: The median grade for the monochromatic series was 4 (range, 2-5) for both readers, whereas the median grade for the 70-keV images was 3 (range, 2-4) for reader 1 and 2 (range, 2-3) for reader 2 (both, p < 0.001). The interobserver agreement using weighted kappa was 0.51 for grading screw-bone interface visualization. The volume CT dose index was 29.5 mGy in all patients and the mean dose-length product was 805.2 mGy × cm.
Monochromatic images generated on gemstone spectral DECT are beneficial in the reduction of metallic streak artifact and enable better visualization of the hardware-bone interface than the 70-keV series in patients treated with spinal transpedicular screw fixation. |
| doi_str_mv | 10.2214/AJR.12.9736 |
| format | Article |
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This retrospective study included postfusion spine CT studies performed from October 2011 through April 2012 on a dual-energy 64-MDCT unit (Discovery CT750 HD). Studies were postprocessed on an Advantage Windows workstation (version 4.4) by two neuroradiologists with creation of monochromatic images from 40 to 140 keV. Each reader graded the screw-bone interfaces on the 70-keV images (used for clinical interpretation) and on the monochromatic series using a 5-point scale (1 [uninterpretable] to 5 [excellent]). The grades of the interfaces were compared using the Wilcoxon signed rank test to detect differences between the 70-keV image and the monochromatic series.
Ninety-two transpedicular screws in 10 patients were studied. Significant improvement in the visibility of the hardware-bone interface was seen on the monochromatic series compared with the 70-keV images: The median grade for the monochromatic series was 4 (range, 2-5) for both readers, whereas the median grade for the 70-keV images was 3 (range, 2-4) for reader 1 and 2 (range, 2-3) for reader 2 (both, p < 0.001). The interobserver agreement using weighted kappa was 0.51 for grading screw-bone interface visualization. The volume CT dose index was 29.5 mGy in all patients and the mean dose-length product was 805.2 mGy × cm.
Monochromatic images generated on gemstone spectral DECT are beneficial in the reduction of metallic streak artifact and enable better visualization of the hardware-bone interface than the 70-keV series in patients treated with spinal transpedicular screw fixation.</description><identifier>ISSN: 0361-803X</identifier><identifier>EISSN: 1546-3141</identifier><identifier>DOI: 10.2214/AJR.12.9736</identifier><identifier>PMID: 24059379</identifier><language>eng</language><publisher>United States</publisher><subject>Adult ; Aged ; Bone Screws ; Female ; Humans ; Male ; Middle Aged ; Prevalence ; Prognosis ; Radiography, Dual-Energy Scanned Projection - methods ; Reproducibility of Results ; Retrospective Studies ; Sensitivity and Specificity ; Spinal Diseases - diagnostic imaging ; Spinal Diseases - surgery ; Spinal Fusion - instrumentation ; Tomography, X-Ray Computed - methods ; Treatment Outcome</subject><ispartof>American journal of roentgenology (1976), 2013-10, Vol.201 (4), p.878-883</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c289t-fda70f500a61557cd3b456d95aa55cc76d2cd29d166386c850bc6926747535193</citedby><cites>FETCH-LOGICAL-c289t-fda70f500a61557cd3b456d95aa55cc76d2cd29d166386c850bc6926747535193</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,4106,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/24059379$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Srinivasan, Ashok</creatorcontrib><creatorcontrib>Hoeffner, Ellen</creatorcontrib><creatorcontrib>Ibrahim, Mohannad</creatorcontrib><creatorcontrib>Shah, Gaurang V</creatorcontrib><creatorcontrib>LaMarca, Frank</creatorcontrib><creatorcontrib>Mukherji, Suresh K</creatorcontrib><title>Utility of dual-energy CT virtual keV monochromatic series for the assessment of spinal transpedicular hardware-bone interface</title><title>American journal of roentgenology (1976)</title><addtitle>AJR Am J Roentgenol</addtitle><description>Our aim was to evaluate the utility of dual-energy CT (DECT) virtual kilo-electron volt (keV) monochromatic images for the visualization of the transpedicular screw-bone interface after spinal fusion.
This retrospective study included postfusion spine CT studies performed from October 2011 through April 2012 on a dual-energy 64-MDCT unit (Discovery CT750 HD). Studies were postprocessed on an Advantage Windows workstation (version 4.4) by two neuroradiologists with creation of monochromatic images from 40 to 140 keV. Each reader graded the screw-bone interfaces on the 70-keV images (used for clinical interpretation) and on the monochromatic series using a 5-point scale (1 [uninterpretable] to 5 [excellent]). The grades of the interfaces were compared using the Wilcoxon signed rank test to detect differences between the 70-keV image and the monochromatic series.
Ninety-two transpedicular screws in 10 patients were studied. Significant improvement in the visibility of the hardware-bone interface was seen on the monochromatic series compared with the 70-keV images: The median grade for the monochromatic series was 4 (range, 2-5) for both readers, whereas the median grade for the 70-keV images was 3 (range, 2-4) for reader 1 and 2 (range, 2-3) for reader 2 (both, p < 0.001). The interobserver agreement using weighted kappa was 0.51 for grading screw-bone interface visualization. The volume CT dose index was 29.5 mGy in all patients and the mean dose-length product was 805.2 mGy × cm.
Monochromatic images generated on gemstone spectral DECT are beneficial in the reduction of metallic streak artifact and enable better visualization of the hardware-bone interface than the 70-keV series in patients treated with spinal transpedicular screw fixation.</description><subject>Adult</subject><subject>Aged</subject><subject>Bone Screws</subject><subject>Female</subject><subject>Humans</subject><subject>Male</subject><subject>Middle Aged</subject><subject>Prevalence</subject><subject>Prognosis</subject><subject>Radiography, Dual-Energy Scanned Projection - methods</subject><subject>Reproducibility of Results</subject><subject>Retrospective Studies</subject><subject>Sensitivity and Specificity</subject><subject>Spinal Diseases - diagnostic imaging</subject><subject>Spinal Diseases - surgery</subject><subject>Spinal Fusion - instrumentation</subject><subject>Tomography, X-Ray Computed - methods</subject><subject>Treatment Outcome</subject><issn>0361-803X</issn><issn>1546-3141</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNo9kEtLxDAURoMoOj5W7iVLQTrm0STNUgafCIKouCuZ5NaJts2YpMps_O128LG6cDnfWRyEDimZMkbL07Ob-yllU6243EATKkpZcFrSTTQhXNKiIvx5B-2m9EoIUZVW22iHlURorvQEfT1m3_q8wqHBbjBtAT3ElxWePeAPH_P4wW_whLvQB7uIoTPZW5wgeki4CRHnBWCTEqTUQZ_XlrT0_bjK0fRpCc7boTURL0x0nyZCMQ89YN9niI2xsI-2GtMmOPi9e-jx4vxhdlXc3l1ez85uC8sqnYvGGUUaQYiRVAhlHZ-XQjotjBHCWiUds45pR6XklbSVIHMrNZOqVIILqvkeOv7xLmN4HyDluvPJQtuaHsKQalpyKSpaaj6iJz-ojSGlCE29jL4zcVVTUq-D12PwmrJ6HXykj37Fw7wD98_-Febf8d59Cw</recordid><startdate>201310</startdate><enddate>201310</enddate><creator>Srinivasan, Ashok</creator><creator>Hoeffner, Ellen</creator><creator>Ibrahim, Mohannad</creator><creator>Shah, Gaurang V</creator><creator>LaMarca, Frank</creator><creator>Mukherji, Suresh K</creator><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>201310</creationdate><title>Utility of dual-energy CT virtual keV monochromatic series for the assessment of spinal transpedicular hardware-bone interface</title><author>Srinivasan, Ashok ; Hoeffner, Ellen ; Ibrahim, Mohannad ; Shah, Gaurang V ; LaMarca, Frank ; Mukherji, Suresh K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c289t-fda70f500a61557cd3b456d95aa55cc76d2cd29d166386c850bc6926747535193</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Adult</topic><topic>Aged</topic><topic>Bone Screws</topic><topic>Female</topic><topic>Humans</topic><topic>Male</topic><topic>Middle Aged</topic><topic>Prevalence</topic><topic>Prognosis</topic><topic>Radiography, Dual-Energy Scanned Projection - methods</topic><topic>Reproducibility of Results</topic><topic>Retrospective Studies</topic><topic>Sensitivity and Specificity</topic><topic>Spinal Diseases - diagnostic imaging</topic><topic>Spinal Diseases - surgery</topic><topic>Spinal Fusion - instrumentation</topic><topic>Tomography, X-Ray Computed - methods</topic><topic>Treatment Outcome</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Srinivasan, Ashok</creatorcontrib><creatorcontrib>Hoeffner, Ellen</creatorcontrib><creatorcontrib>Ibrahim, Mohannad</creatorcontrib><creatorcontrib>Shah, Gaurang V</creatorcontrib><creatorcontrib>LaMarca, Frank</creatorcontrib><creatorcontrib>Mukherji, Suresh K</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>American journal of roentgenology (1976)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Srinivasan, Ashok</au><au>Hoeffner, Ellen</au><au>Ibrahim, Mohannad</au><au>Shah, Gaurang V</au><au>LaMarca, Frank</au><au>Mukherji, Suresh K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Utility of dual-energy CT virtual keV monochromatic series for the assessment of spinal transpedicular hardware-bone interface</atitle><jtitle>American journal of roentgenology (1976)</jtitle><addtitle>AJR Am J Roentgenol</addtitle><date>2013-10</date><risdate>2013</risdate><volume>201</volume><issue>4</issue><spage>878</spage><epage>883</epage><pages>878-883</pages><issn>0361-803X</issn><eissn>1546-3141</eissn><abstract>Our aim was to evaluate the utility of dual-energy CT (DECT) virtual kilo-electron volt (keV) monochromatic images for the visualization of the transpedicular screw-bone interface after spinal fusion.
This retrospective study included postfusion spine CT studies performed from October 2011 through April 2012 on a dual-energy 64-MDCT unit (Discovery CT750 HD). Studies were postprocessed on an Advantage Windows workstation (version 4.4) by two neuroradiologists with creation of monochromatic images from 40 to 140 keV. Each reader graded the screw-bone interfaces on the 70-keV images (used for clinical interpretation) and on the monochromatic series using a 5-point scale (1 [uninterpretable] to 5 [excellent]). The grades of the interfaces were compared using the Wilcoxon signed rank test to detect differences between the 70-keV image and the monochromatic series.
Ninety-two transpedicular screws in 10 patients were studied. Significant improvement in the visibility of the hardware-bone interface was seen on the monochromatic series compared with the 70-keV images: The median grade for the monochromatic series was 4 (range, 2-5) for both readers, whereas the median grade for the 70-keV images was 3 (range, 2-4) for reader 1 and 2 (range, 2-3) for reader 2 (both, p < 0.001). The interobserver agreement using weighted kappa was 0.51 for grading screw-bone interface visualization. The volume CT dose index was 29.5 mGy in all patients and the mean dose-length product was 805.2 mGy × cm.
Monochromatic images generated on gemstone spectral DECT are beneficial in the reduction of metallic streak artifact and enable better visualization of the hardware-bone interface than the 70-keV series in patients treated with spinal transpedicular screw fixation.</abstract><cop>United States</cop><pmid>24059379</pmid><doi>10.2214/AJR.12.9736</doi><tpages>6</tpages></addata></record> |
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| source | American Roentgen Ray Society; MEDLINE; Alma/SFX Local Collection |
| subjects | Adult Aged Bone Screws Female Humans Male Middle Aged Prevalence Prognosis Radiography, Dual-Energy Scanned Projection - methods Reproducibility of Results Retrospective Studies Sensitivity and Specificity Spinal Diseases - diagnostic imaging Spinal Diseases - surgery Spinal Fusion - instrumentation Tomography, X-Ray Computed - methods Treatment Outcome |
| title | Utility of dual-energy CT virtual keV monochromatic series for the assessment of spinal transpedicular hardware-bone interface |
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