1. The state regulates x-ray CT scanners Directly [i.e. identified as CT]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CA . . FL . . GA . . . . . . . IL . . . . . . . . . . . . . LA . MD . . . . . . . . . . . MS . MO NE . . NJ . . OR . . PA . . . . . . . UT . WV Indirectly [as a radiation machine] . . . . . . . . . . . . . . . . . . . . . . AL . . . . . . . . . . . . . . . . . . I...

As X-ray computed tomography (CT) is widely used in diagnosis and radiotherapy, it is important to reduce the radiation dose as low as reasonably achievable. For this purpose, one may use the TV based methods or wavelet frame based methods to reconstruct high quality images from reduced number of projections. Furthermore, by using the interior tomography scheme which only illuminates a region-o...

Chest X-ray ( fig. 1 a, arrows) and a contrast-enhanced CT scan ( fig. 1 b) demonstrated a well-defined, homogeneous, pleural soft-tissue mass close to the right diaphragm. It was slightly enhanced, similar to that of a normal liver without any anatomic connection with subpleural, normal liver. A diagnostic CT-guided transthoracic A 65-year-old female who had never smoked presented with an abno...

Model-based image reconstruction (MBIR) methods for X-ray CT reconstruction can improve image quality and reduce patient X-ray dose. These methods produce images by solving high-dimensional, statistically motivated numerical optimization problems, but unfortunately the high computational costs of solving these problems have kept MBIR algorithms from reaching ubiquity in the clinic. In this pape...

Introduction: Head-and-neck cancer is the sixth most common cancer worldwide with the number of cases consistently increasing in developing countries. Successful development of effective, safe and cost effective nanoprobes for head-and-neck cancer targeting imaging is a big challenge. This study is aimed to develop cysteamine-folate conjugated gold nanoparticles (F-Cys-AuNPs) a...

A laser-driven electron-storage ring can produce nearly monochromatic, tunable X-rays in the keV energy regime by inverse Compton scattering. The small footprint, relative low cost and excellent beam quality provide the prospect for valuable preclinical use in radiography and tomography. The monochromaticity of the beam prevents beam hardening effects that are a serious problem in quantitative ...

For complicated structural components with wide x-ray attenuation ranges, conventional fixed-energy computed tomography (CT) imaging cannot obtain all the structural information. This limitation results in a shortage of CT information because the effective thickness of the components along the direction of x-ray penetration exceeds the limit of the dynamic range of the x-ray imaging system. To ...

In this paper, we propose a method to classify pulmonary artery and vein in chest X-ray CT images automatically. When a doctor discriminates between benign or malignant of lung tumors, kind of pulmonary blood vessels which are involved in tumors is very important. However there is no difference on CT values. So it is difficult to classify vessels based on CT values. Our method uses anatomical p...

X-ray imaging techniques that capture variations in the x-ray phase can yield higher contrast images with lower x-ray dose than is possible with conventional absorption radiography. However, the extraction of phase information is often more difficult than the extraction of absorption information and requires a more sophisticated experimental arrangement. We here report a method for three-dimens...