Document Detail

Optimization of CT angiography of the carotid artery with a 16-MDCT scanner: craniocaudal scan direction reduces contrast material-related perivenous artifacts.
MedLine Citation:
PMID:  16714668     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The objective of our study was to compare the effect of a caudocranial scan direction versus a craniocaudal scan direction on arterial enhancement and perivenous artifacts in 16-MDCT angiography of the supraaortic arteries. SUBJECTS AND METHODS: Eighty consecutive patients (51 men; mean age, 62 years; age range, 28-89 years) underwent scanning in the caudocranial direction (group 1; n = 40) or the craniocaudal direction (group 2; n = 40). All patients received 80 mL of contrast material followed by a 40-mL saline chaser bolus, both administered IV at 4 mL/sec. Bolus tracking was used. Attenuation inside the arterial lumen was measured at intervals of 1 sec throughout the data set. Attenuation in the superior vena cava (SVC) was measured. Contrast material-related perivenous artifacts were graded on a scale of 0-3 (none to extensive). RESULTS: Attenuation in the ascending aorta, carotid bifurcation, and intracranial arteries was slightly lower in group 2 versus group 1 (231 +/- 64 H, 348 +/- 52 H, and 258 +/- 48 H vs 282 +/- 43 H, 381 +/- 73 H, and 291 +/- 77 H, respectively; p < 0.05). Maximum and mean arterial attenuations were slightly lower in group 2 versus group 1 (369 +/- 58 H and 303 +/- 48 H vs 401 +/- 71 H and 334 +/- 58 H; p < 0.05). Attenuation in the SVC was much lower in group 2 versus group 1 (169 +/- 39 H vs 783 +/- 330 H; p < 0.001). Mean streak artifact score was much lower in group 2 versus group 1 (1.3 +/- 0.9 vs 2.5 +/- 0.6; p < 0.001). CONCLUSION: Use of a craniocaudal scan direction results in slightly lower attenuation of the carotid artery and much lower attenuation of the SVC. Streak artifacts are significantly reduced. This technique allows better evaluation of the ascending aorta and supraaortic arteries.
Cécile de Monyé; Thomas T de Weert; William Zaalberg; Filippo Cademartiri; Dorine A M Siepman; Diederik W J Dippel; Aad van der Lugt
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  AJR. American journal of roentgenology     Volume:  186     ISSN:  1546-3141     ISO Abbreviation:  AJR Am J Roentgenol     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-05-22     Completed Date:  2006-06-29     Revised Date:  2008-02-15    
Medline Journal Info:
Nlm Unique ID:  7708173     Medline TA:  AJR Am J Roentgenol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1737-45     Citation Subset:  AIM; IM    
Department of Radiology, Erasmus University Medical Center, Dr. Molewaterplein 40, Rotterdam, The Netherlands, 3015 GD.
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MeSH Terms
Aged, 80 and over
Angiography / methods*
Carotid Arteries / radiography*
Contrast Media
Middle Aged
Tomography, X-Ray Computed* / methods
Reg. No./Substance:
0/Contrast Media

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