NDLI: MR contingency supplement prior for joint estimation of activity and attenuation in non-time-of-flight positron emission tomography/MR

Content Provider	IET Digital Library
Author	Atibi, A. Rezaei, M.
Abstract	Maximum likelihood reconstruction of activity and attenuation (MLAA) from emission data only suffered from the inherent cross-talk between the estimated attenuation and activity distributions. The authors proposed an improved MLAA algorithm by utilising tissue prior atlas (TPA) and a Gibbs prior as prior knowledge. TPA determines the plausible region for each of the typical attenuation coefficients; hence, it imposes statistical condition as a supplement for the exclusive magnetic resonance (MR) information on the reconstruction process of attenuation map. Therefore, along with the soft tissue distribution provided by the segmentation of MR images, an air mask and a bone probability map breakdown the MR low-signal class into four subclasses in order to favour recognition of air and bone. Estimations on attenuation coefficients are realised as a mixture of pseudo-Gaussian distributions. The proposed algorithm is evaluated using the simulated 3D emission data. The proposed MLAA-TPA algorithm is compared with the MR-MLAA algorithm proposed by Heußer et al. Their results demonstrate that the MR-MLAA algorithm performance depends heavily on the MR segmentation accuracy well handled by MLAA-TPA. The quantification results illustrated that the MLAA-TPA outperformed the MR-MLAA algorithm owing to reduction of misclassification and more precise tissue detection.
Starting Page	928
Ending Page	930
Page Count	3
ISSN	00135194
Volume Number	54
e-ISSN	1350911X
Issue Number	Issue 15, Jul (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/54/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2018.0708
Journal	Electronics Letters
Publisher Date	2018-06-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Activity Distributions Air Mask Attenuation Coefficient Attenuation Estimation Attenuation Map Biological Tissues Biology And Medical Computing Biomedical Magnetic Resonance Imaging Biomedical MRI Bone Bone Probability Map Breakdown Computer Vision And Image Processing Technique Emission Data Exclusive Magnetic Resonance Information Gaussian Distribution Gibbs Prior Image Classification Image Reconstruction Image Segmentation Inherent Cross-talk Maximum Likelihood Estimation Maximum Likelihood Reconstruction Medical Image Processing Medical Magnetic Resonance Imaging And Spectroscopy MLAA-TPA Algorithm MR Contingency Supplement Prior MR Image Segmentation MR-MLAA Algorithm Performance Nontime-of-flight Positron Emission Tomography/MR Nuclear Medicine, Emission Tomography Optical, Image And Video Signal Processing Patient Diagnostic Method And Instrumentation Positron Emission Tomography Probability Probability Theory PseudoGaussian Distribution Soft Tissue Distribution Spectroscopy Statistics Stochastic Linearised SCUC Tissue Prior Atlas
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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