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CT Artifact Introduced by Radiofrequency Ablation

Darren D. Brennan1, Liat Appelbaum1, Vassilios Raptopolous1, Jonathan B. Kruskal1 and S. Nahum Goldberg1

1 All authors: Department of Abdominal Imaging and Intervention, Beth Israel Deaconess Medical Center, One Deaconess Rd., Boston, MA 02215.


Figure 1
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  		Fig. 1A —CT fluoroscopy images of electrode placement in 71-year-old man with hepatocellular carcinoma. Image obtained with 120 kVp, 40 mAs, and 8-mm slice thickness shows no artifact.

 

Figure 2
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  		Fig. 1B —CT fluoroscopy images of electrode placement in 71-year-old man with hepatocellular carcinoma. Image obtained with 120 kVp, 40 mAs, and 8-mm slice thickness during radiofrequency ablation using a 480-kHz generator and 1,200 mA shows severe artifact, precluding useful examination of ablation zone and preventing procedural monitoring.

 

Figure 3
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  		Fig. 1C —CT fluoroscopy images of electrode placement in 71-year-old man with hepatocellular carcinoma. Image obtained with 120 kVp, 40 mAs, and 8-mm slice thickness during radiofrequency shows that increasing generator current from 1,200 to 2,000 mA has not appreciably changed artifact.

 

Figure 4
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  		Fig. 1D —CT fluoroscopy images of electrode placement in 71-year-old man with hepatocellular carcinoma. Image obtained with 120 kVp, 40 mAs, and 8-mm slice thickness during radiofrequency pulsing (i.e., with no current flowing) shows no artifact.

 

Figure 5
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  		Fig. 1E —CT fluoroscopy images of electrode placement in 71-year-old man with hepatocellular carcinoma. Image obtained with 120 kVp, 250 mAs, and 8-mm slice thickness during radiofrequency ablation with 200-W, 480-kHz generator, and 2,000 mA shows that increasing CT tube current from 40 to 250 mAs has lessened artifact, compared with that in C.

 

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