Radiation Imaging Techniques Research Articles

The Front of Radiation Imaging Technique (4) . Elemental Mapping Using Micro-PIXE

The Front of Radiation Imaging Technique (4) . Elemental Mapping Using Micro-PIXE

Report from the Radiation Oncology Committee of the Southwest Oncology Group (SWOG): Research Objectives Workshop 2003.

To achieve the ultimate goal of cancer treatment, which is 100% cancer control with negligible toxicity, the therapeutic window must be enlarged, allowing for higher doses of beneficial treatments with reduced toxicity. The advent of image- and metabolism-guided therapy offers the best opportunity to date for combining modern radiation targeting and imaging techniques. Indeed, for the first time, it is reasonable to locally target metastatic disease with the goal of sterilization. Combining these focal radiation techniques with novel targeted antiproliferative agents and full-dose classic cytotoxic chemotherapy will become more effective as we learn to use these compounds in a less systemically toxic manner and as radiation fields become more defined. In addition, increasing numbers of biologic modifiers of normal tissue response are becoming available, and they suggest great promise for decreasing the normal tissue toxicity resulting from both radiation and chemotherapy treatments. Thus, radiation metastectomy for gross metastases, used together with systemic control of micrometastatic disease, may yield improved survival rates. This hypothesis is ready for testing in cancers of the breast, prostate, colon, and in sarcomas. Enlarging the therapeutic window is a major goal that would allow for an increasingly favorable therapeutic gain.

Developments in radiation imaging techniques

For centuries, scientists and engineers dreamed of being able to peer into the interiors of microscopic and macroscopic objects. A variety of imaging techniques, both invasive and non-invasive, have been developed to accomplish this goal. The present article provides an overview of our work on non-invasive imaging techniques being used and developed for basic and applied sciences. The details of various developments in setting up X-ray and neutron imaging techniques for applications in the Indian nuclear programme, development of two- and three-dimensional tomography for industrial applications, digital medical imaging, X-ray diffraction imaging for exploring the condensed matter at normal and high pressure conditions, X-ray holography for atomic resolution imaging, phase-sensitive imaging and imaging of transient phenomenon are discussed in this paper.

On the Serial Publishing of “The Front of Radiation Imaging Technique”

On the Serial Publishing of “The Front of Radiation Imaging Technique”

Direct Observation of Grain Boundary Wetting by Synchrotron Radiation Imaging Techniques

Direct Observation of Grain Boundary Wetting by Synchrotron Radiation Imaging Techniques

Performance Characteristics of the Annular Core Research Reactor Fuel Motion Detection System

Recent proof tests have shown that the annular core research reactor (ACRR) fuel motion detection system has reached its design goals of providing high temporal and spatial resolution pictures of fuel distributions in the ACRR. The coded aperture imaging system (CAIS) images the fuel by monitoring the fission gamma rays from the fuel that pass through collimators in the reactor core. The gamma-ray beam is modulated by coded apertures before producing a visible light coded image in thin scintillators. Each coded image is then amplified and recorded by an opticalimage-intensifier/fast-framing-camera combination. The proximity to the core and the coded aperture technique provide a high data collection rate and high resolution. Experiments of CAIS at the ACRR conducted under steady-state operation have documented the beneficial effects of changes in the radiation shielding and imaging technique. The spatial resolutions are 1.7 mm perpendicular to the axis of a single liquid-metal fast breeder reactor fuel pin and 9 mm in the axial dimension. Changes in mass of 100 mg in each resolution element can be detected each frame period, which may be from 5 to 100 ms. This diagnostic instrument may help resolve important questions in fuel motion phenomenology.

Radiation Imaging—An Interesting Utilization of Nuclear Engineering Methodology

Using well-established nuclear engineering methods, an interesting new radiation imaging technique has been developed. Scattered neutrons and photons have been found to carry detailed information a...

Radiation Imaging Technique for Thermal Conductivity Measurement Above 1000°C

Imaging techniques and apparatus have been developed for measurement of thermal conductivity of small size samples at temperatures from 1000°C to the melting point of the material. Details of the method for heating the sample in an electric arc imaging furnace, measuring the temperature distribution over the sample surface with an optical pyrometer, and measuring the heat flux leaving the back of the sample with a thermopile are given. A computational procedure is described suitable for machine computer use.