Uniform Image Quality Achieved by Tube Current Modulation Using SD of Attenuation in Coronary CT Angiography
The objective of our study was to evaluate whether the SD of CT attenuation values obtained from unenhanced scans of the left atrium is a reliable parameter for the individual modulation of tube current to achieve uniform image quality in coronary CT angiography (CTA). One hundred patients (59 men a...
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| Veröffentlicht in: | American journal of roentgenology (1976) 2007-07, Vol.189 (1), p.188-196 |
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| container_title | American journal of roentgenology (1976) |
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| creator | Hur, Gham Hong, Seong Wan Kim, Su Young Kim, Yong Hoon Hwang, Yoon Joon Lee, Won Ro Cha, Soon Joo |
| description | The objective of our study was to evaluate whether the SD of CT attenuation values obtained from unenhanced scans of the left atrium is a reliable parameter for the individual modulation of tube current to achieve uniform image quality in coronary CT angiography (CTA).
One hundred patients (59 men and 41 women) who were suspected to have coronary artery disease underwent coronary CTA using a 64-MDCT scanner. In addition to clinical studies, we also performed measurements on water phantoms. Tube current was modulated by the SD of the CT attenuation values measured from the left atrium on unenhanced images scanned at 300 mA. A modulation table was created from data obtained from the studies of water phantoms scanned at various tube currents. Other scanning parameters were identical to those used to obtain unenhanced and contrast-enhanced studies of the 100 patients. The SD values were measured from images scanned at an adjusted tube current, and the images of normal coronary and internal mammary arteries were graded. Radiation doses measured using the volume CT dose index (CTDI(vol)) were compared between the SD of the CT attenuation values and the modulation parameters suggested by the manufacturer of the scanner.
Image quality was rated as grade 3 (low mottle) on a 4-grade scale by four observers for 92-94 of the 100 patients (average, 92.5%). The mean SD value at an adjusted tube current was 12.1 H with an SD of 0.758 H (target SD = 12 H). A radiation dose reduction of 9-45% was achieved in patients grouped by weight who weighed less than 70 kg, and a reduction of up to 71% was seen in individual cases.
Modulating tube current using the SD of CT attenuation values from the left atrium is a highly reliable method of achieving uniform image quality in coronary CTA. |
| doi_str_mv | 10.2214/AJR.06.1201 |
| format | Article |
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One hundred patients (59 men and 41 women) who were suspected to have coronary artery disease underwent coronary CTA using a 64-MDCT scanner. In addition to clinical studies, we also performed measurements on water phantoms. Tube current was modulated by the SD of the CT attenuation values measured from the left atrium on unenhanced images scanned at 300 mA. A modulation table was created from data obtained from the studies of water phantoms scanned at various tube currents. Other scanning parameters were identical to those used to obtain unenhanced and contrast-enhanced studies of the 100 patients. The SD values were measured from images scanned at an adjusted tube current, and the images of normal coronary and internal mammary arteries were graded. Radiation doses measured using the volume CT dose index (CTDI(vol)) were compared between the SD of the CT attenuation values and the modulation parameters suggested by the manufacturer of the scanner.
Image quality was rated as grade 3 (low mottle) on a 4-grade scale by four observers for 92-94 of the 100 patients (average, 92.5%). The mean SD value at an adjusted tube current was 12.1 H with an SD of 0.758 H (target SD = 12 H). A radiation dose reduction of 9-45% was achieved in patients grouped by weight who weighed less than 70 kg, and a reduction of up to 71% was seen in individual cases.
Modulating tube current using the SD of CT attenuation values from the left atrium is a highly reliable method of achieving uniform image quality in coronary CTA.</description><identifier>ISSN: 0361-803X</identifier><identifier>EISSN: 1546-3141</identifier><identifier>DOI: 10.2214/AJR.06.1201</identifier><identifier>PMID: 17579170</identifier><identifier>CODEN: AAJRDX</identifier><language>eng</language><publisher>Leesburg, VA: Am Roentgen Ray Soc</publisher><subject>Applied radiobiology (equipment, dosimetry...) ; Biological and medical sciences ; Biological effects of radiation ; Cardiology. Vascular system ; Cardiovascular system ; Coronary Angiography - methods ; Coronary Artery Disease - diagnostic imaging ; Coronary heart disease ; Female ; Fundamental and applied biological sciences. Psychology ; Heart ; Heart Atria - diagnostic imaging ; Humans ; Investigative techniques, diagnostic techniques (general aspects) ; Male ; Medical sciences ; Middle Aged ; Radiation Dosage ; Radiodiagnosis. Nmr imagery. Nmr spectrometry ; Radiographic Image Enhancement - methods ; Radiographic Image Interpretation, Computer-Assisted - methods ; Reproducibility of Results ; Sensitivity and Specificity ; Tissues, organs and organisms biophysics ; Tomography, X-Ray Computed - methods</subject><ispartof>American journal of roentgenology (1976), 2007-07, Vol.189 (1), p.188-196</ispartof><rights>2007 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c348t-de61b061360e075407522ceb782f8ccdf42dff4991e70674e063fed11e0363f63</citedby><cites>FETCH-LOGICAL-c348t-de61b061360e075407522ceb782f8ccdf42dff4991e70674e063fed11e0363f63</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,4120,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=18860293$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17579170$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Hur, Gham</creatorcontrib><creatorcontrib>Hong, Seong Wan</creatorcontrib><creatorcontrib>Kim, Su Young</creatorcontrib><creatorcontrib>Kim, Yong Hoon</creatorcontrib><creatorcontrib>Hwang, Yoon Joon</creatorcontrib><creatorcontrib>Lee, Won Ro</creatorcontrib><creatorcontrib>Cha, Soon Joo</creatorcontrib><title>Uniform Image Quality Achieved by Tube Current Modulation Using SD of Attenuation in Coronary CT Angiography</title><title>American journal of roentgenology (1976)</title><addtitle>AJR Am J Roentgenol</addtitle><description>The objective of our study was to evaluate whether the SD of CT attenuation values obtained from unenhanced scans of the left atrium is a reliable parameter for the individual modulation of tube current to achieve uniform image quality in coronary CT angiography (CTA).
One hundred patients (59 men and 41 women) who were suspected to have coronary artery disease underwent coronary CTA using a 64-MDCT scanner. In addition to clinical studies, we also performed measurements on water phantoms. Tube current was modulated by the SD of the CT attenuation values measured from the left atrium on unenhanced images scanned at 300 mA. A modulation table was created from data obtained from the studies of water phantoms scanned at various tube currents. Other scanning parameters were identical to those used to obtain unenhanced and contrast-enhanced studies of the 100 patients. The SD values were measured from images scanned at an adjusted tube current, and the images of normal coronary and internal mammary arteries were graded. Radiation doses measured using the volume CT dose index (CTDI(vol)) were compared between the SD of the CT attenuation values and the modulation parameters suggested by the manufacturer of the scanner.
Image quality was rated as grade 3 (low mottle) on a 4-grade scale by four observers for 92-94 of the 100 patients (average, 92.5%). The mean SD value at an adjusted tube current was 12.1 H with an SD of 0.758 H (target SD = 12 H). A radiation dose reduction of 9-45% was achieved in patients grouped by weight who weighed less than 70 kg, and a reduction of up to 71% was seen in individual cases.
Modulating tube current using the SD of CT attenuation values from the left atrium is a highly reliable method of achieving uniform image quality in coronary CTA.</description><subject>Applied radiobiology (equipment, dosimetry...)</subject><subject>Biological and medical sciences</subject><subject>Biological effects of radiation</subject><subject>Cardiology. Vascular system</subject><subject>Cardiovascular system</subject><subject>Coronary Angiography - methods</subject><subject>Coronary Artery Disease - diagnostic imaging</subject><subject>Coronary heart disease</subject><subject>Female</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Heart</subject><subject>Heart Atria - diagnostic imaging</subject><subject>Humans</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Male</subject><subject>Medical sciences</subject><subject>Middle Aged</subject><subject>Radiation Dosage</subject><subject>Radiodiagnosis. Nmr imagery. Nmr spectrometry</subject><subject>Radiographic Image Enhancement - methods</subject><subject>Radiographic Image Interpretation, Computer-Assisted - methods</subject><subject>Reproducibility of Results</subject><subject>Sensitivity and Specificity</subject><subject>Tissues, organs and organisms biophysics</subject><subject>Tomography, X-Ray Computed - methods</subject><issn>0361-803X</issn><issn>1546-3141</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpF0E2L2zAQBmBRWrrZbU-9F13ay-J0xnIk-2jcry1bStsEehOyPXJUbDlIdkP-fR0S2MMwMDwMMy9jbxDWaYrZh_LbrzXINaaAz9gKN5lMBGb4nK1ASExyEH9u2G2MfwFA5YV6yW5QbVSBClas33lnxzDwh8F0xH_OpnfTiZfN3tE_anl94tu5Jl7NIZCf-PexnXszudHzXXS-478_8tHycprIz5e587waw-hNOPFqy0vfubEL5rA_vWIvrOkjvb72O7b7_GlbfU0ef3x5qMrHpBFZPiUtSaxBopBAoDbZUmnaUK3y1OZN09osba3NigJJgVQZgRSWWkRaHhZWijt2f9nbhDHGQFYfghuWezSCPmeml8w0SH3ObNFvL_ow1wO1T_Ya0gLeXYGJjeltML5x8cnluYS0EIt7f3F71-2PLpCOg-n7ZS3q4_GIeaHxrMV_FMWA9Q</recordid><startdate>20070701</startdate><enddate>20070701</enddate><creator>Hur, Gham</creator><creator>Hong, Seong Wan</creator><creator>Kim, Su Young</creator><creator>Kim, Yong Hoon</creator><creator>Hwang, Yoon Joon</creator><creator>Lee, Won Ro</creator><creator>Cha, Soon Joo</creator><general>Am Roentgen Ray Soc</general><general>American Roentgen Ray Society</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20070701</creationdate><title>Uniform Image Quality Achieved by Tube Current Modulation Using SD of Attenuation in Coronary CT Angiography</title><author>Hur, Gham ; Hong, Seong Wan ; Kim, Su Young ; Kim, Yong Hoon ; Hwang, Yoon Joon ; Lee, Won Ro ; Cha, Soon Joo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c348t-de61b061360e075407522ceb782f8ccdf42dff4991e70674e063fed11e0363f63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Applied radiobiology (equipment, dosimetry...)</topic><topic>Biological and medical sciences</topic><topic>Biological effects of radiation</topic><topic>Cardiology. Vascular system</topic><topic>Cardiovascular system</topic><topic>Coronary Angiography - methods</topic><topic>Coronary Artery Disease - diagnostic imaging</topic><topic>Coronary heart disease</topic><topic>Female</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Heart</topic><topic>Heart Atria - diagnostic imaging</topic><topic>Humans</topic><topic>Investigative techniques, diagnostic techniques (general aspects)</topic><topic>Male</topic><topic>Medical sciences</topic><topic>Middle Aged</topic><topic>Radiation Dosage</topic><topic>Radiodiagnosis. Nmr imagery. Nmr spectrometry</topic><topic>Radiographic Image Enhancement - methods</topic><topic>Radiographic Image Interpretation, Computer-Assisted - methods</topic><topic>Reproducibility of Results</topic><topic>Sensitivity and Specificity</topic><topic>Tissues, organs and organisms biophysics</topic><topic>Tomography, X-Ray Computed - methods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hur, Gham</creatorcontrib><creatorcontrib>Hong, Seong Wan</creatorcontrib><creatorcontrib>Kim, Su Young</creatorcontrib><creatorcontrib>Kim, Yong Hoon</creatorcontrib><creatorcontrib>Hwang, Yoon Joon</creatorcontrib><creatorcontrib>Lee, Won Ro</creatorcontrib><creatorcontrib>Cha, Soon Joo</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><jtitle>American journal of roentgenology (1976)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hur, Gham</au><au>Hong, Seong Wan</au><au>Kim, Su Young</au><au>Kim, Yong Hoon</au><au>Hwang, Yoon Joon</au><au>Lee, Won Ro</au><au>Cha, Soon Joo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Uniform Image Quality Achieved by Tube Current Modulation Using SD of Attenuation in Coronary CT Angiography</atitle><jtitle>American journal of roentgenology (1976)</jtitle><addtitle>AJR Am J Roentgenol</addtitle><date>2007-07-01</date><risdate>2007</risdate><volume>189</volume><issue>1</issue><spage>188</spage><epage>196</epage><pages>188-196</pages><issn>0361-803X</issn><eissn>1546-3141</eissn><coden>AAJRDX</coden><abstract>The objective of our study was to evaluate whether the SD of CT attenuation values obtained from unenhanced scans of the left atrium is a reliable parameter for the individual modulation of tube current to achieve uniform image quality in coronary CT angiography (CTA).
One hundred patients (59 men and 41 women) who were suspected to have coronary artery disease underwent coronary CTA using a 64-MDCT scanner. In addition to clinical studies, we also performed measurements on water phantoms. Tube current was modulated by the SD of the CT attenuation values measured from the left atrium on unenhanced images scanned at 300 mA. A modulation table was created from data obtained from the studies of water phantoms scanned at various tube currents. Other scanning parameters were identical to those used to obtain unenhanced and contrast-enhanced studies of the 100 patients. The SD values were measured from images scanned at an adjusted tube current, and the images of normal coronary and internal mammary arteries were graded. Radiation doses measured using the volume CT dose index (CTDI(vol)) were compared between the SD of the CT attenuation values and the modulation parameters suggested by the manufacturer of the scanner.
Image quality was rated as grade 3 (low mottle) on a 4-grade scale by four observers for 92-94 of the 100 patients (average, 92.5%). The mean SD value at an adjusted tube current was 12.1 H with an SD of 0.758 H (target SD = 12 H). A radiation dose reduction of 9-45% was achieved in patients grouped by weight who weighed less than 70 kg, and a reduction of up to 71% was seen in individual cases.
Modulating tube current using the SD of CT attenuation values from the left atrium is a highly reliable method of achieving uniform image quality in coronary CTA.</abstract><cop>Leesburg, VA</cop><pub>Am Roentgen Ray Soc</pub><pmid>17579170</pmid><doi>10.2214/AJR.06.1201</doi><tpages>9</tpages></addata></record> |
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| subjects | Applied radiobiology (equipment, dosimetry...) Biological and medical sciences Biological effects of radiation Cardiology. Vascular system Cardiovascular system Coronary Angiography - methods Coronary Artery Disease - diagnostic imaging Coronary heart disease Female Fundamental and applied biological sciences. Psychology Heart Heart Atria - diagnostic imaging Humans Investigative techniques, diagnostic techniques (general aspects) Male Medical sciences Middle Aged Radiation Dosage Radiodiagnosis. Nmr imagery. Nmr spectrometry Radiographic Image Enhancement - methods Radiographic Image Interpretation, Computer-Assisted - methods Reproducibility of Results Sensitivity and Specificity Tissues, organs and organisms biophysics Tomography, X-Ray Computed - methods |
| title | Uniform Image Quality Achieved by Tube Current Modulation Using SD of Attenuation in Coronary CT Angiography |
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