Low-mAs X-ray CT image reconstruction by adaptive-weighted TV-constrained penalized re-weighted least-squares

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Penalized weighted least-squares image reconstruction for positron emission tomography

Presents an image reconstruction method for positron-emission tomography (PET) based on a penalized, weighted least-squares (PWLS) objective. For PET measurements that are precorrected for accidental coincidences, the author argues statistically that a least-squares objective function is as appropriate, if not more so, than the popular Poisson likelihood objective. The author proposes a simple ...

متن کامل

Penalized Weighted Least-Squares Approach for Low-Dose X- Ray Computed Tomography

The noise of low-dose computed tomography (CT) sinogram follows approximately a Gaussian distribution with nonlinear dependence between the sample mean and variance. The noise is statistically uncorrelated among detector bins at any view angle. However the correlation coefficient matrix of data signal indicates a strong signal correlation among neighboring views. Based on above observations, Ka...

متن کامل

Glicbawls - Grey Level Image Compression by Adaptive Weighted Least Squares

In recent years most research into lossless and near lossless compression of greyscale images could be characterized as belonging to either of two distinct groups The rst group which is concerned with so called practical algorithms encom passes research into methods that allow compression and decompression with low to moderate computational complexity while still obtaining impressive compressio...

متن کامل

Spatial Resolution Properties of Penalized Weighted Least-squares Tomographic Image Reconstruction with Model Mismatch

This paper presents an analysis of the spatial resolution properties of tomographic image reconstruction based on a regularized least-squares objective function. The derivations are based on an idealized space-invariant tomographic system having a continuum of radial and angular samples. The analysis accounts for mismatch between the true radial point-spread function (PSF) of the measurements a...

متن کامل

Penalized weighted least-squares image reconstruction for positron emission tomography - Medical Imaging, IEEE Transactions on

This paper presents an image reconstruction method for positron-emission tomography (PET) based on a penalized, weighted least-squares (PWLS) objective. For PET measurements that are precorrected for accidental coincidences, we argue statistically that a least-squares objective function is as appropriate, if not more so, than the popular Poisson likelihood objective. We propose a simple data-ba...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Journal of X-Ray Science and Technology

سال: 2014

ISSN: 0895-3996

DOI: 10.3233/xst-140437