Portions of this study were presented on August 17, 2010, at the ACVR Annual Scientific Meeting, in Asheville, NC.
COMPARATIVE SONOGRAPHIC APPEARANCE OF NEPHROLITHS AND ASSOCIATED ACOUSTIC SHADOWING ARTIFACTS IN CONVENTIONAL vs. SPATIAL COMPOUND IMAGING
Article first published online: 15 DEC 2011
© 2012 Veterinary Radiology & Ultrasound
Veterinary Radiology & Ultrasound
Volume 53, Issue 2, pages 217–220, March / April 2012
How to Cite
Heng, H. G., Rohleder, J. J. and Pressler, B. M. (2012), COMPARATIVE SONOGRAPHIC APPEARANCE OF NEPHROLITHS AND ASSOCIATED ACOUSTIC SHADOWING ARTIFACTS IN CONVENTIONAL vs. SPATIAL COMPOUND IMAGING. Veterinary Radiology & Ultrasound, 53: 217–220. doi: 10.1111/j.1740-8261.2011.01904.x
- Issue published online: 19 MAR 2012
- Article first published online: 15 DEC 2011
- Manuscript Accepted: 6 NOV 2011
- Manuscript Received: 14 SEP 2011
- distal acoustic shadowing artifact;
- spatial compound imaging
Spatial compound sonography improves visualization of tissue details and allows clearer delineation of structural margins. Improved image clarity is due to reduced speckling artifact; however, other types of acoustic shadowing artifacts may be unchanged or variably altered when conventional and spatial compound sonographic images are compared. Because intrarenal distal shadowing artifacts in conventional sonographic images are oftentimes the first or only evidence that a nephroliths is present, we compared the appearance and associated artifacts of nephroliths examined with both imaging modes. Consensus evaluation by two evaluators confirmed differences in appearance of nephroliths based on imaging mode. Nephroliths with conventional imaging mode were less hyperechoic and had better margin delineation while nephroliths were more hyperechoic and had less distinct margins with spatial compound imaging mode. Distal acoustic shadowing artifacts were present in 43% of spatial compound imaging mode vs. 86% of conventional imaging mode. When present in both imaging modes, intensity of these artifacts was weaker and the distance traveled was shorter in spatial compound imaging mode. Multiple diverging acoustic shadowing artifacts originating from a single source, the nephroliths were occasionally noted in spatial compound but not conventional imaging mode. These results demonstrate that the absence of distal acoustic shadowing cannot be used to exclude the presence of a nephrolith in dogs and cats. Optimal diagnosis of nephroliths, margin delineation, and visualization of the distal renal parenchyma requires paired radiography and sonography, and alternating between sonographic imaging modes is therefore suggested.