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

(2007) European radiology. 17(7). p.1842-1849
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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/infinity) 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.
Keywords
Coronary Plaque, Convolutions Kernels, Multislice Computed Tomography, Coronary Angiography

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Chicago
Cademartiri, Filippo, Ludovico La Grutta, Giuseppe Runza, Alessandro Palumbo, Erica Maffei, Nico RA Mollet, Tommaso Vincenzo Bartolotta, et al. 2007. “Influence of Convolution Filtering on Coronary Plaque Attenuation Values: Observations in an Ex Vivo Model of Multislice Computed Tomography Coronary Angiography.” European Radiology 17 (7): 1842–1849.
APA
Cademartiri, F., La Grutta, L., Runza, G., Palumbo, A., Maffei, E., Mollet, N. R., Bartolotta, T. V., et al. (2007). Influence of convolution filtering on coronary plaque attenuation values: observations in an ex vivo model of multislice computed tomography coronary angiography. European radiology, 17(7), 1842–1849.
Vancouver
1.
Cademartiri F, La Grutta L, Runza G, Palumbo A, Maffei E, Mollet NR, et al. Influence of convolution filtering on coronary plaque attenuation values: observations in an ex vivo model of multislice computed tomography coronary angiography. European radiology. Germany: Springer International; 2007;17(7):1842–9.
MLA
Cademartiri, Filippo, Ludovico La Grutta, Giuseppe Runza, et al. “Influence of Convolution Filtering on Coronary Plaque Attenuation Values: Observations in an Ex Vivo Model of Multislice Computed Tomography Coronary Angiography.” European radiology 17.7 (2007): 1842–1849. Print.
@article{836494,
  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/infinity) 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 {\textlangle} 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.},
  author       = {Cademartiri, Filippo and La Grutta, Ludovico and Runza, Giuseppe  and Palumbo, Alessandro and Maffei, Erica and Mollet, Nico RA  and Bartolotta, Tommaso Vincenzo and Somers, Pamela and Knaapen, Michiel  and Verheye, Stefan and Midiri, Massimo  and Hamers, Ronald and Bruining, Nico},
  issn         = {1432-1084},
  journal      = {European radiology},
  keyword      = {Coronary Plaque,Convolutions Kernels,Multislice Computed Tomography,Coronary Angiography},
  language     = {eng},
  number       = {7},
  pages        = {1842--1849},
  publisher    = {Springer International},
  title        = {Influence of convolution filtering on coronary plaque attenuation values: observations in an ex vivo model of multislice computed tomography coronary angiography},
  url          = {http://dx.doi.org/10.1007/s00330-006-0548-z},
  volume       = {17},
  year         = {2007},
}

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