Dual-Energy Technique at Low Tube Voltages for Small Animal Imaging

被引：4

作者：

Cho S. ^{[1
]}

Sidky E.Y. ^{[1
]}

Bian J. ^{[1
]}

Pan X. ^{[1
]}

机构：

[1] Department of Radiology, University of Chicago, Chicago

来源：

Tsinghua Science and Technology | 2010年 / 15卷 / 01期

基金：

美国国家卫生研究院;

关键词：

dual-energy; specimen radiography; spectrum estimation;

D O I：

10.1016/S1007-0214(10)70013-4

中图分类号：

学科分类号：

摘要：

We investigate the feasibility of dual-energy method for image contrast enhancement in small animal studies using a low kV X-ray radiographic system. A robust method for X-ray spectrum estimation from transmission measurements, based on expectation-maximization (EM) method, is applied to an X-ray specimen radiographic system for dual energy imaging of a mouse. From transmission measurements of two known attenuators at two different X-ray tube voltages, the X-ray energy spectra are reconstructed using the EM-based method. From the spectra information thus obtained, the transmission data for bone and soft tissue in terms of various thicknesses are generated. Two polynomial functions of transmission data are then sought for to fit the inverted thicknesses of bone and soft-tissue. Scatters in cone-beam projection data acquired at two X-ray energies were corrected. From the scatter-corrected data, a bone thickness map is separated from a soft-tissue thickness map by use of the polynomial functions. © 2010 Tsinghua University Press.

引用

页码：79 / 86

页数：7

共 30 条

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