The Bigyeokjincheolloe (bomb shell), a scientific cultural heritage, has outstanding historical value for sustaining gunpowder weapon of Joseon. In this study, the bomb shell was modeled through three-dimensional (3D) scanning centered on external shape and γ-ray radiography-based internal shape. particular, to improve contrast in radiographic image, optimization image processing were performed...

Micro-gap formation at the implant-abutment interface of two-piece dental implants was investigated in vitro using high-resolution radiography in combination with hard X-ray synchrotron radiation. Images were taken with the specimen under different mechanical loads of up to 100 N. The aim of this investigation was to prove the existence of micro-gaps for implants with conical connections as wel...

When scanning weakly attenuating samples using an X-ray tube with a very small focal spot size, the acquired projections not only contain absorption contrast, but also phase contrast due to refraction of the X-rays. Although the resulting edge enhancement can be beneficial in radiography, the tomographic reconstruction of such mixed projections using a conventional algorithm yields cross-sectio...

Diagnostic radiography is a leading cause of man-made radiation exposure to the population. Individual risk assessment and analytic epidemiologic studies likewise require retrospective assessment of lifelong exposure from medical sources. Typical schemes attempt to determine accumulated doses of specific „critical organs“. The organ dose to the red bone marrow is relevant in studies of diseases...

A full-field hard X-ray imaging beamline (BL-4) was designed, developed, installed and commissioned recently at the Indus-2 synchrotron radiation source at RRCAT, Indore, India. The bending-magnet beamline is operated in monochromatic and white beam mode. A variety of imaging techniques are implemented such as high-resolution radiography, propagation- and analyzer-based phase contrast imaging, ...

Picture 1. A chest radiography showing cardiomegaly and presence of pleural efusion. Picture 2. Contrast-enhanced computed tomography of the whole abdomen showing the hepatic vein and inferior vena cava are engorgement (black arrow) with early reflux of contrast medium into inferior vena cava and hepatic vein (white arrow). Delayed contrast enhancement and inhomogeneous patern of the liver pare...

To the Editor:—We read with interest the case report by Albertin et al. regarding a spontaneous arachnoid postpartum leak and headache. In the case report, the authors state that the magnetic resonance imaging scanning was done without contrast because the patient was breast-feeding. However, current recommendations suggest that the use of radiographic contrast media is compatible with breast-f...

E.G. Hoeffner S.K. Mukherji A. Srinivasan D.J. Quint SUMMARY: Although radiography of the spine began shortly after Roentgen’s discovery in 1895, there was little written in the medical literature about spine imaging until nearly 25 years later with the development of myelography, first by using air and then a variety of positive contrast agents. The history of spine imaging before CT and MR im...

High quality electron beams produced by laser plasma accelerators, in the bubble regime or in the colliding laser pulse regime, have properties of interest for many applications in fields such as material science, medicine, and chemistry. We present shortly the principle of laser plasma accelerators and we show why these beams are of interest for radiography and radiotherapy.

Collimation is widely used for X-ray examinations to reduce the overall radiation exposure to the patient and improve the contrast resolution in the region of interest (ROI), that has been exposed directly to X-rays. It is desirable to detect the region of interest and exclude the unexposed area to optimize the image display. Although we only focus on the X-ray images generated with a rectangul...