Abstract
| Lingua originale | English |
|---|---|
| pagine (da-a) | 1842-1849 |
| Numero di pagine | 8 |
| Rivista | European Radiology |
| Volume | 17 |
| Stato di pubblicazione | Published - 2007 |
All Science Journal Classification (ASJC) codes
- Radiology Nuclear Medicine and imaging
Cita questo
INFLUENCE OF CONVOLUTION FILTERING ON CORONARY PLAQUE ATTENUATION VALUES: OBSERVATIONS IN AN EX VIVO MODEL OF MULTISLICE COMPUTED TOMOGRAPHY CORONARY ANGIOGRAPHY. / Cademartiri, F.; Palumbo, A.; Maffei, E.; Mollet, N.; Somers, P.; Knaapen, M.; Verheye, S.; Hamers, R.; Bruining, N.
In: European Radiology, Vol. 17, 2007, pag. 1842-1849.Risultato della ricerca: Article
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TY - JOUR
T1 - INFLUENCE OF CONVOLUTION FILTERING ON CORONARY PLAQUE ATTENUATION VALUES: OBSERVATIONS IN AN EX VIVO MODEL OF MULTISLICE COMPUTED TOMOGRAPHY CORONARY ANGIOGRAPHY.
AU - Cademartiri, F.; Palumbo, A.; Maffei, E.; Mollet, N.; Somers, P.; Knaapen, M.; Verheye, S.; Hamers, R.; Bruining, N.
AU - Midiri, Massimo
AU - Bartolotta, Tommaso Vincenzo
AU - Runza, Giuseppe
AU - La Grutta, Ludovico
PY - 2007
Y1 - 2007
N2 - 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
AB - 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
KW - Multislice computed tomography, Coronary angiography, Coronary plaque, Convolutions kernels
UR - http://hdl.handle.net/10447/30357
M3 - Article
VL - 17
SP - 1842
EP - 1849
JO - European Radiology
JF - European Radiology
SN - 0938-7994
ER -