Ying Guo MD, Presenter: Nothing to Disclose

Dapeng Shi MD, Abstract Co-Author: Nothing to Disclose

Peigang Ning, Abstract Co-Author: Nothing to Disclose

Minghua Sun, Abstract Co-Author: Nothing to Disclose

To evaluate image quality and radiation dose of spectral imaging of renal angiography compared with low kVp CTA scan.

10 patients(BMI>25,group A)referred to renal CT angiography underwent gemstone spectral CTA with pitch of 1.375 using Iodixanol270(1ml/kg,5ml/s),10 patients (BMI>25,group B) performed conventional 100 kVp CTA with Noise Index of 11.5,pitch of 1.375 using Iopromide270(1ml/kg,5ml/s)were reviewed as control.Images of GSI scans were reconstructed to choose best keV by using CNR tool.Images of low kVp scans were reconstructed with ASiR50%.Rois were placed in psoas muscle,renal artery of optimal keV series and traditional 120kVp scans.CT value and noise(SD) was recorded and compared.Signal-to-noise ratio(SNR) and contrast-to-noise ratio(CNR) was calculated with ROI measurements. Image quality and radiation dose was statistically compared.

SNR of renal artery were 34.10±4.40 for optimal low keV and 29.68±6.39 for 100 kVp ,CNR of renal artery were 29.26±4.00 for optimal low keV and 24.65±6.33for 100 kVp. DLP was 477.36±69.48 mGy.cm for optimal low keV and 355.19±20.43 mGy.cm for 100 kVp. There was significantly difference between low keV and low kVp scans(p<0.05).

Spectral imaging with low keV can provide higher CT value,SNR and CNR but a little higher dose for renal artery imaging compared with 100kVp.

Spectral imaging can give more information except for artery imaging. We shall make a balance of image quality, valuable information and radiation dose according to clinical needs.

Guo, Y, Shi, D, Ning, P, Sun, M, Which One Shall We Choose for a Better Artery Imaging: Low kVp Scan or Spectral Imaging with Low keV One?.  Radiological Society of North America 2013 Scientific Assembly and Annual Meeting, December 1 - December 6, 2013 ,Chicago IL. http://archive.rsna.org/2013/13044493.html