Influence of convolution filtering on coronary plaque attenuation values: observations in an ex vivo model of multislice computed tomography coronary angiographyReport as inadecuate




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European Radiology

, Volume 17, Issue 7, pp 1842–1849

First Online: 24 January 2007Received: 16 May 2006Revised: 28 September 2006Accepted: 17 November 2006

Abstract

Attenuation variability measured in Hounsfield Units, HU of human coronary plaques using multislice computed tomography MSCT was evaluated in an ex vivo model with increasing convolution kernels. MSCT was performed in seven ex vivo left coronary arteries sunk into oil followingthe instillation of saline 1-∞ and a 1-50 solution of contrast material 400 mgI-ml iomeprol. Scan parameters were: slices-collimation, 16-0.75 mm; rotation time, 375 ms. Four convolution kernels were used: b30f-smooth, b36f-medium smooth, b46f-medium and b60f-sharp. An experienced radiologist scored for the presence of plaques and measured the attenuation in lumen, calcified and noncalcified plaques and the surrounding oil. The results were compared by the ANOVA test and correlated with Pearson’s test. The signal-to-noise ratio SNR and contrast-to-noise ratio CNR were calculated. The mean attenuation values were significantly different between the four filters p < 0.0001 in each structure with both solutions. After clustering for the filter, all of the noncalcified plaque values 20.8 ± 39.1, 14.2 ± 35.8, 14.0 ± 32.0, 3.2 ± 32.4 HU with saline; 74.7 ± 66.6, 68.2 ± 63.3, 66.3 ± 66.5, 48.5 ± 60.0 HU in contrast solution were significantly different, with the exception of the pair b36f–b46f, for which a moderate-high correlation was generally found. Improved SNRs and CNRs were achieved by b30f and b46f. The use of different convolution filters significantly modifief the attenuation values, while sharper filtering increased the calcified plaque attenuation and reduced the noncalcified plaque attenuation.

KeywordsMultislice computed tomography Coronary angiography Coronary plaque Convolutions kernels  Download fulltext PDF



Author: Filippo Cademartiri - Ludovico La Grutta - Giuseppe Runza - Alessandro Palumbo - Erica Maffei - Nico RA Mollet - Tommaso 

Source: https://link.springer.com/







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