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DUAL ENERGY CT IN EVALUATING RENAL CYSTS WITH QUANTITATIVE COMPARISON OF TRUE AND VIRTUAL UNENHANCED IMAGES

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AUTHORS :

Dr  Abhinaya Shanker

 Dr Manavjit Singh Sandhu ( Presenting Author )  

Dr Ujjwal Gorsi

Dr Ravi Mohan

 

 

 

TITLE :

DUAL ENERGY CT IN EVALUATING RENAL CYSTS WITH QUANTITATIVE COMPARISON OF TRUE AND VIRTUAL UNENHANCED IMAGES

 

ABSTRACT  TOPIC :

Kidneys Imaging

 

PURPOSE :

The objective and the purpose of this study was to assess the utility of dual energy CT in the characterisation of renal cysts , and investigate comparability of the derived virtual unenhanced and true non contrast images.

 

METHODS AND MATERIALS :

 

30 patients with renal cysts detected on Ultrasound underwent Dual phase CT : cortico medullary phase in dual energy , nephrographic  phase in single energy.Non contrast scans were obtained for comparison. The attenuation values of true and virtual unenhanced imaged were compared , other morphological characteristics were scrutinised. Iodine quantification was performed to exclude enhancement.The effective radiation dose for dual energy acquisition and true non contrast ct was calculated.

 

RESULTS :

The difference in Hounsfield Units Values between TNC and VNC images was statistically insignificant ( p=0.425) .There was accurate detection of septal calcification using VNC images and of enhancing septae by iodine overlay images. There was also conclusive exclusion of minimal enhacement in hyperdense cysts . By omission of non contrast phase there was a 31 % reduction in radiation dose.

 

CONCLUSION:

We feel that, Dual energy CT is useful in characterising renal cysts with true and virtual unenhanced images being quantitatively comparable . Omission of TNC scan from the established renal mass evaluation protocol resulted in a significant  31% radiation dose reduction in our study.

 

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