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Dual Phase Hepatic CT

Influence of Scanning Direction on Liver Attenuation

E. O'Riordan1, C. M. Craven1, D. Wilson2 and P. J. Robinson1

1 Department of Clinical Radiology, St. James's University Hospital, Beckett St., Leeds LS9 7TF, United Kingdom.
2 Department of Medical Physics, St. James's University Hospital, Leeds LS9 7TF, United Kingdom.



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  		Fig. 1A. —61-year-old man with colorectal cancer. A and B, Arterial phase (A) and portal venous phase (B) hepatic CT scans show placement of peripheral hepatic (1), central hepatic (2), and aortic (3) regions of interest for attenuation measurement. Metastasis is present in segment 7.

 


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  		Fig. 1B. —61-year-old man with colorectal cancer. A and B, Arterial phase (A) and portal venous phase (B) hepatic CT scans show placement of peripheral hepatic (1), central hepatic (2), and aortic (3) regions of interest for attenuation measurement. Metastasis is present in segment 7.

 


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  		Fig. 2. —Graph shows mean attenuation of central ([UNK]) and peripheral ([UNK]) hepatic parenchyma during arterial phase acquisition in craniocaudal direction. Error bars represent standard deviation.

 


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  		Fig. 3. —Graph shows mean attenuation of central ([UNK]) and peripheral ([UNK]) hepatic parenchyma during portal venous phase acquisition in craniocaudal direction. Error bars represent standard deviation.

 


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  		Fig. 4. —Graph shows mean attenuation of central ([UNK]) and peripheral ([UNK]) hepatic parenchyma during arterial phase acquisition in caudocranial direction. Error bars represent standard deviation.

 


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  		Fig. 5. —Graph shows mean attenuation of central ([UNK]) and peripheral ([UNK]) hepatic parenchyma during portal venous phase acquisition in caudocranial direction. Error bars represent standard deviation.

 

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