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Scanning Beyond Anatomic Limits of the Thorax in Chest CT: Findings, Radiation Dose, and Automatic Tube Current Modulation

Justin Campbell1, Mannudeep K. Kalra1,2, Stefania Rizzo1, Michael M. Maher3 and Jo-Anne Shepard1

1 Department of Radiology, Massachusetts General Hospital, Boston, MA 02114.
3 Department of Radiology, University College, Cork, Ireland.



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  		Fig. 1 —Transverse CT image of 70-year-old man who underwent chest CT for evaluation of lung nodule shows hypodense lesion in right kidney, an important finding in infrapulmonary extra image of indeterminate indication. Histopathology showed renal cell carcinoma.

 


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  		Fig. 2A —Radiation doses with fixed tube current and z-axis modulation techniques are different. Transverse CT image of 60-year-old woman who underwent chest CT for follow-up of pulmonary nodule using fixed tube current technique at 100 mAs.

 


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  		Fig. 2B —Radiation doses with fixed tube current and z-axis modulation techniques are different. Transverse CT image of 32-year-old woman who underwent chest CT for follow-up of pulmonary nodule using z-axis modulation technique with 190 mAs in supraapical extra image.

 

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