Fast X-Ray Luminescence Computed Tomography Imaging

Autor: Hongkai Wang, Xin Liu, Qimei Liao
Rok vydání: 2014
Předmět:
Zdroj: IEEE Transactions on Biomedical Engineering. 61:1621-1627
ISSN: 1558-2531
0018-9294
DOI: 10.1109/tbme.2013.2294633
Popis: X-ray luminescence computed tomography (XLCT) opens new possibilities to perform molecular imaging with X-ray. However, challenges remain in dynamic XLCT imaging, where short scan time, good spatial resolution, and whole-body field of view should be considered simultaneously. In this paper, by the use of a single-view XLCT reconstruction method based on a compressive sensing (CS) technique, incorporating a cone beam XLCT imaging system, we implement fast 3-D XLCT imaging. To evaluate the performance of the method, two types of phantom experiments were performed based on a cone beam XLCT imaging system. In Case 1, one tube filled with the X-ray-excitable nanophosphor (Gd $_{2}$ O $_{3}$ :Eu $^{3+}$ ) was immerged in different positions in the phantom to evaluate the effect of the source position on single-view XLCT reconstruction accuracy. In Case 2, two tubes filled with Gd $_{2}$ O $_{3}$ :Eu $^{3+}$ were immerged in different heights in the phantom to evaluate the whole-body imaging performance of single-view XLCT reconstruction. The experimental results indicated that the tubes used in previous phantom experiments can be resolved from single-view XCLT reconstruction images. The location error is less than 1.2 mm. In addition, since only one view data are needed to implement 3-D XLCT imaging, the acquisition time can be greatly reduced (∼1 frame/s) compared with previous XLCT systems. Hence, the technique is suited for imaging the fast distribution of the X-ray-excitable nanophosphors within a biological object.
Databáze: OpenAIRE
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