Dual-energy attenuation coefficient decomposition with differential filtration and application to a microCT scanner.
Dual-energy attenuation coefficient decomposition with differential filtration and application to a microCT scanner.
复制标题
微分滤波双能衰减系数分解及其在 microCT 扫描仪上的应用。
DOI：
10.1088/0031-9155/55/4/016
复制
发表时间：
2010
影响因子：
3.5
通讯作者：
Chatziioannou,AF
中科院分区：
文献类型：
--
作者：
Taschereau,R;Silverman,RW;Chatziioannou,AF
Dual-energy x-ray computed tomography (DECT) has the capability to decompose attenuation coefficients using two basis functions and has proved its potential in reducing beam-hardening artifacts from reconstructed images. The method typically involves two successive scans with different x-ray tube voltage settings. This work proposes an approach to dual-energy imaging through x-ray beam filtration that requires only one scan and a single tube voltage setting. It has been implemented in a preclinical microCT tomograph with minor modifications. Retrofitting of the microCT scanner involved the addition of an automated filter wheel and modifications to the acquisition and reconstruction software. Results show that beam-hardening artifacts are reduced to noise level. Acquisition of a μ-Compton image is well suited for attenuation-correction of PET images while dynamic energy selection (4D viewing) offers flexibility in image viewing by adjusting contrast and noise levels to suit the task at hand. All dual-energy and single energy reference scans were acquired at the same soft tissue dose level of 50 mGy.
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