Title :
A compressed sensing approach to low-radiation CT reconstruction
Author :
Wen Hou ; Cishen Zhang
Author_Institution :
Fac. of Sci., Eng. & Technol., Swinburne Univ. of Technol., Swinburne, VIC, Australia
Abstract :
This paper is on reduction of x-ray radiation dosage in computerized tomography (CT) examinations without compromising the image quality by compressed sensing (CS). For this purpose, the smoothness of the sinogram data set and the sparsity of its frequency transformation are exploited which, in corporation with a randomly projected x-ray radiation scheme, can result in a randomly undersampled partial Fourier matrix as the sensing matrix for CS reconstruction. The formulation of this CT data acquisition and reconstruction scheme satisfies the incoherence and sparsity properties required by CS theory. Based on this scheme, a weighted ℓ1 regularized optimization algorithm is proposed for computing the CS image reconstruction. Its reconstruction performance and advantages over other known CT reconstruction methods are demonstrated by simulated phantom and CT images.
Keywords :
compressed sensing; computerised tomography; data acquisition; image reconstruction; medical image processing; optimisation; phantoms; CS image reconstruction; CS theory; CT data acquisition; CT imaging; compressed sensing approach; computerized tomography; frequency transformation; image quality; low-radiation CT reconstruction; optimization algorithm; randomly projected X-ray radiation scheme; randomly undersampled partial Fourier matrix; sensing matrix; simulated phantom; sinogram data set; sparsity properties; Biomedical imaging; Computed tomography; Discrete Fourier transforms; Image reconstruction; Physics; Vectors; X-ray imaging; Compressed sensing; Computed tomography; Medical imaging; Regularized optimization;
Conference_Titel :
Communication Systems, Networks & Digital Signal Processing (CSNDSP), 2014 9th International Symposium on
Conference_Location :
Manchester
DOI :
10.1109/CSNDSP.2014.6923935