Dr Abhinaya Shanker
Dr Manavjit Singh Sandhu ( Presenting Author )
Dr Ujjwal Gorsi
Dr Ravi Mohan
DUAL ENERGY CT IN EVALUATING RENAL CYSTS WITH QUANTITATIVE COMPARISON OF TRUE AND VIRTUAL UNENHANCED IMAGES
ABSTRACT TOPIC :
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.
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.
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.