Dual Source CT Liver imaging with Dual Energy

SOMATOM Definition Dual Energy scanning

Satoru Kitano MD, Nagaaki Marugami MD, Toshiaki Taoka PhD MD,
Kimihiko Kichikawa PhD MD Department of Radiology, Nara Medical University, Nara / Japan
 |  2008-03-18

History

A 55 year-old male was referred to a Dual Source CT follow-up scan after transcatheter arterial chemoembolization (TACE) of his hepatocellular carcinoma 6 years ago. A contrast enhanced dynamic CT scan of the abdomen was performed on the SOMATOM Definition using spiral Dual Energy evaluation.

 

Diagnosis
The hepatic arterial-dominant phase images revealed numerous hyper-attenuating lesions. From these dual energy images, virtual non contrast images were generated with a colored iodine overlay that could be phased in and out. The lesions, detected in S4 of the liver, showed the same hypo-attenuation in the virtual non-contrast and in the native CT images and the colored iodine overlay allowed a clear analysis of the iodine uptake in the lesions. The patient was diagnosed with multiple HCC recurrence with liver cirrhosis.

 

Comments
In the Dual Energy mode, two x-ray sources can be operated simultaneously at different kV levels. The results are two spiral data sets acquired in a single scan providing diverse information that allows one to differentiate, characterize, isolate, and distinguish the imaged tissue and material. Enhancement patterns of liver lesions can clearly be visualized with the Dual Energy Liver VNC application.
 

 

Examination Protocol

Scanner
SOMATOM Definition
Scan area
Abdomen
Scan length
268mm
Scan time
10s
Scan direction
Cranio-Caudal
kV
140 / 80kv
Effective mAs
80 / 345 eff mAs
Rotation time
0.5 s
Slice collimation
0.6mm
Reconstructed slice thickness                
1 mm
Increment
0.5mm
Kernel
D30

 

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Los fármacos y dosis mencionados en el presente son consistentes con la etiqueta de aprobación para usos y/o indicaciones del fármaco. El médico que lo trata es completamente responsable del diagnóstico y tratamiento de los pacientes, incluyendo los medicamentos y dosis prescritas en relación con dicho uso. Las instrucciones de funcionamiento se deben seguir con cuidado cuando se usa el sistema. El origen de los datos técnicos es correspondiente a las fichas técnicas. Los resultados pueden variar.