Abstract
The present study was performed to determine the potential of applying dual-energy subtraction (DES) digital tomo-synthesis to basic physical evaluations. Volumetric X-ray DES digital tomosysnthesis was used to obtain an image of a detectability phantom (an artificial lesion). The image quality of DES digital tomosynthesis was compared to that of DES radiography. The purpose of this study was to determine enhanced visibility quantified in terms of the contrast- to-noise ratio, figure-of-merit, and root-mean-square error. In the in-focus plane, the image quality is better by DES digital tomosynthesis than by DES radiography. The potential usefulness of DES digital tomosynthesis for evaluating a detectability phantom was demonstrated. Further studies are required to determine the ability of DES digital tomosyn-thesis to quantify the spatial relationships between the artificial lesion components of these devices, as well as to iden- tify lesions with diagnostic consequences.
Highlights
Dual-energy subtraction (DES) imaging can be used to improve the conspicuity of a specific tissue
Processing of the high-contrast detectability phantom gave clear contrast detectability by dual-energy subtraction (DES) digital tomosynthesis imaging, and DES digital radiography produced an increase in the number of same images (Figure 3)
Regarding the images of similar signal size and CaCO3 status, images processed by DES digital tomosynthesis had greater contrast than those processed by DES digital radiography
Summary
Dual-energy subtraction (DES) imaging can be used to improve the conspicuity of a specific tissue. With DES imaging, the image signal of one tissue material can be suppressed in order to remove anatomic background noise, thereby enhancing the contrast of the feature of interest. DES involves making two radiographic projections of the patient using X-ray beams of different energies. Recent computed radiography (CR) systems have been hampered by poor subtraction effectiveness, workflow inconveniences, and detective quantum efficiency limitations in the CR technology. DES has been applied to the detection of calcium in pulmonary nodules [5,6], bone mineral analysis [7], and cardiac imaging [8]
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