This paper presents a new BIST(Built-in Selftest) method for A/D converters. The method characterizes the static parameters of A/D converter like offset, gain, INL(Integral Non-linearity) and DNL(Differential Non-linearity). It uses a ramp signal as a test stimulus and consists of three detectors – a transition detector, an INL detector and a DNL detector. The transition detector checks the cod...

BACKGROUND AND PURPOSE Recently introduced 320-detector row CT enables whole brain perfusion imaging compared to a limited scanning area in 64-detector row CT. Our aim was to evaluate patient radiation exposure in comprehensive stroke imaging by using multidetector row CT consisting of standard CT of the head, CTA of cerebral and cervical vessels, and CTP. MATERIAL AND METHODS Organ doses wer...

Radiation Transport Simulation Studies Using MCNP for a Cow Phantom to Determine an Optimal Detector Configuration for a New Livestock Portal. (August 2012) Joe Justina, M.Sc., Mangalore University Co-Chairs of Advisory Committee: Dr. Craig M. Marianno Dr. Sunil S. Chirayath A large radiological accident will result in the contamination of surrounding people, animal, vegetation etc. In such a s...

The edge method for measuring the modulation transfer function (MTF) has recently gained popularity due to its simplicity and appropriateness particularly for digital imaging systems. Often edge test devices made of rather thin metal sheets are used, which are semitransparent to x rays and may generate scattered radiation. The effect of this scattered radiation on the determined MTF was investi...

As discussed in the Technical Proposal, we have developed a proof-of-concept of the fast timing detector system capable of 10 to 20 ps resolution, depending on the number of channels employed. There is still quite a bit of R&D required, however, to get to a full system prototype that is capable of being installed in mid-2013. This R&D falls into two main categories: 1) fairly routine refinement...

introduction: one of the most important parameters in x-ray ct imaging is the noise induced by detected scattered radiation. the detected scattered radiation is completely dependent on the scanner geometry as well as size, shape and material of the scanned object. the magnitude and spatial distribution of the scattered radiation in x-ray ct should be quantified for development of robust scatter...

We propose a new scintillation-type detector in which high-energy radiation generates electron–hole pairs in a direct-gap semiconductor material that subsequently recombine producing infrared light to be registered by a photo-detector. The key issue is how to make the semiconductor essentially transparent to its own infrared light, so that photons generated deep inside the semiconductor could r...

A synthetic single crystal diamond detector (SCDD) is commercially available and is characterized for radiation dosimetry in various radiation beams in this study. The characteristics of the commercial SCDD model 60019 (PTW) with 6- and 15-MV photon beams, and 208-MeV proton beams, were investigated and compared with the pre-characterized detectors: Semiflex (model 31010) and PinPoint (model 31...

FPGA has found an increasingly wide utilization in automatic train control (ATC) equipment used in highspeed rail systems, which is potentially sensitive to radiation. How the space radiation caused by Geomagnetic storm affects FPGA devices was analyzed. This paper investigated the FPGA fault-tolerance techniques used nowadays and presented a new mitigation technique against upsets, duplication...

FPGA has found an increasingly wide utilization in automatic train control (ATC) equipment used in highspeed rail systems, which is potentially sensitive to radiation. How the space radiation caused by Geomagnetic storm affects FPGA devices was analyzed. This paper investigated the FPGA fault-tolerant techniques used nowadays and presented a new mitigation technique based on duplication with co...