| Prospective gating with 320-MDCT angiography: effect of volume scan length on radiation dose. | |
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MedLine Citation:
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PMID: 21257894 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The purpose of this study was to evaluate the relation between radiation dose reduction and volume scan length for prospectively ECG-gated 320-MDCT angiography in the diagnosis of coronary artery disease. MATERIALS AND METHODS: MDCT with prospective ECG gating was performed at one of the three volume scan lengths depending on heart length. Of 175 patients, 95 (55%; body mass index, 29 ± 5.9; mean heart rate, 59 ± 7 beats/min) underwent scanning at 160 mm; 46 (26%; body mass index, 30 ± 4.1; mean heart rate, 56 ± 5.74 beats/min) at 140 mm; and 34 (19%; body mass index, 30 ± 3.71; mean heart rate, 58 ± 3.96 beats/min) at 120 mm. RESULTS: The median radiation doses were 6.5 mSv (95% CI, 6.03-7.2 mSv) for the 95 patients who underwent scanning at a volume scan length of 160 mm, 4.33 mSv (95% CI, 4.06-6.62 mSv) for the 46 patients who underwent scanning at 140 mm, and 3.47 mSv (95% CI, 3.15-3.62 mSv) for the 34 patients who underwent scanning at 120 mm. The reduction in scan length from 160 to 140 mm represented a reduction in scan length of 12.5% and the reduction to 120 mm a reduction of 25%. The median radiation dose was reduced 33% when volume scan length was changed to 140 mm and 47% when the length was changed to 120 mm. CONCLUSION: Dose optimization remains an important concern in cardiac CT, and for 320-MDCT angiography, substantial dose reduction can be achieved by reducing volume scan length so that it is in concert with the patient's heart length. |
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Authors:
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Atif Khan; Khurram Nasir; Faisal Khosa; Amina Saghir; Sheryar Sarwar; Melvin E Clouse |
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Publication Detail:
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Type: Comparative Study; Evaluation Studies; Journal Article; Research Support, N.I.H., Extramural |
Journal Detail:
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Title: AJR. American journal of roentgenology Volume: 196 ISSN: 1546-3141 ISO Abbreviation: AJR Am J Roentgenol Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-24 Completed Date: 2011-03-03 Revised Date: 2012-03-12 |
Medline Journal Info:
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Nlm Unique ID: 7708173 Medline TA: AJR Am J Roentgenol Country: United States |
Other Details:
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Languages: eng Pagination: 407-11 Citation Subset: AIM; IM |
Affiliation:
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Department of Radiology, Harvard Medical School, Beth Israel Deaconess Medical Center, 1 Deaconess Rd., WCC 308A, Boston, MA 02215, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Coronary Angiography* Coronary Artery Disease / radiography* Electrocardiography Female Humans Male Middle Aged Radiation Dosage* Retrospective Studies Tomography, X-Ray Computed / methods* |
| Grant Support | |
ID/Acronym/Agency:
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P50 HL083813-05/HL/NHLBI NIH HHS; P50-HL083813/HL/NHLBI NIH HHS; T32 CA059367-14/CA/NCI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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