Titre
3D noise power spectrum applied on clinical mdct scanners: effects of reconstruction algorithms and reconstruction filters
Type
abstract de conférence/colloque
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Série
Proceedings of SPIE
Auteur(s)
Mieville, F.A.
Auteure/Auteur
Bolard, G.
Auteure/Auteur
Benkreira, M.
Auteure/Auteur
Ayestaran, P.
Auteure/Auteur
Gudinchet, F.
Auteure/Auteur
Bochud, F.
Auteure/Auteur
Verdun, F.R.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
Titre du livre ou conférence/colloque
Conference on Medical Imaging 2011, Physics of Medical Imaging
Adresse
Lake Buena Vista, Florida, USA, February 13, 2011
ISBN
0277-786X
Statut éditorial
Publié
Date de publication
2011
Volume
7961
Première page
79610E
Langue
anglais
Notes
Publication type : Proceedings Paper
Résumé
The noise power spectrum (NPS) is the reference metric for understanding the noise content in computed tomography (CT) images. To evaluate the noise properties of clinical multidetector (MDCT) scanners, local 2D and 3D NPSs were computed for different acquisition reconstruction parameters.A 64- and a 128-MDCT scanners were employed. Measurements were performed on a water phantom in axial and helical acquisition modes. CT dose index was identical for both installations. Influence of parameters such as the pitch, the reconstruction filter (soft, standard and bone) and the reconstruction algorithm (filtered-back projection (FBP), adaptive statistical iterative reconstruction (ASIR)) were investigated. Images were also reconstructed in the coronal plane using a reformat process. Then 2D and 3D NPS methods were computed.In axial acquisition mode, the 2D axial NPS showed an important magnitude variation as a function of the z-direction when measured at the phantom center. In helical mode, a directional dependency with lobular shape was observed while the magnitude of the NPS was kept constant. Important effects of the reconstruction filter, pitch and reconstruction algorithm were observed on 3D NPS results for both MDCTs. With ASIR, a reduction of the NPS magnitude and a shift of the NPS peak to the low frequency range were visible. 2D coronal NPS obtained from the reformat images was impacted by the interpolation when compared to 2D coronal NPS obtained from 3D measurements.The noise properties of volume measured in last generation MDCTs was studied using local 3D NPS metric. However, impact of the non-stationarity noise effect may need further investigations.
PID Serval
serval:BIB_DCCB40F4C318
Date de création
2011-09-29T08:47:10.929Z
Date de création dans IRIS
2025-05-21T06:41:02Z