This paper describes a new readout integrated circuit and non-uniformity correction (NUC) method that ensures the bolometer array has low over wide operating temperature range without thermoelectric cooler (TEC). The proposed NUC minimizes memory required for signal processing, making it suitable compact power-efficient portable infrared cameras. It corrects aging phenomenon through start-up ca...

Sensor gain and offset non-uniformities associated with the IRFPA is the prime factor in limiting the performance of an infrared system to a great extent. This technique is based upon the Kalman filter in which gain and offset non-uniformities are treated as random variable and filter parameters are updated on pixel-by-pixel basis in every frame. This algorithm is tested on actual infrared data...

As whole body MRI (WB-MRI) gains currency, the data this class of technique generates presents new challenges for the imaging community. One acquisition protocol currently being applied with considerable success entails imaging the subject in a number of successive coronal sections, resulting in a high resolution, gap free, full body acquisition. However this technique often results in consider...

H. Kabasawa, C. Guclu, Z. Li Applied Science Laboratory Japan, GE Yokogawa Medical Systems, Hino-shi, Tokyo, Japan, GE Healthcare-Technologies, 3200 Grandview Blvd, Waukesha, WI, United States [Introduction] MR imaging with phased array receive coils became available at 3T and higher field strengths. In lower field strength systems, uniformity correction methods using body coil image as homogen...

the non-uniformity factor is used for correction of the formulas obtained from the one-dimentional fluid flow method in a centrifugal impeller pump. the variations of radial velocity at the outlet of five centrifugal impellers with the specific speed of about ns =50 are calculated at design point by using two-dimentional potentional flow method for an invisid fluid. on the other hand~ the varia...

Smoothly varying and multiplicative intensity variations within MR images that are artifactual, can reduce the accuracy of automated brain segmentation. Fortunately, these can be corrected. Among existing correction approaches, the nonparametric non-uniformity intensity normalization method N3 (Sled, J.G., Zijdenbos, A.P., Evans, A.C., 1998. Nonparametric method for automatic correction of inte...

ISGRI, the IBIS low energy camera (15 keV 1 MeV) on board INTEGRAL, is the first large CdTe gamma-ray imager in orbit. We present here an overview of the ISGRI in-flight calibrations performed during the first months after launch. We discuss the stability of the camera as well as the CdTe pixels response under cosmic radiation. The energy calibrations were done using lead and tungsten fluoresce...

UNLABELLED Tissue attenuation results in nonuniform myocardial perfusion images with significant sex differences. New SPECT imaging protocols to correct attenuation are currently under investigation. This study was performed to assess the effects of attenuation correction (AC) on overall image uniformity compared with more conventional imaging protocols in both men and women. METHODS Thirty-n...

Data required for the determination of the absolute air kerma rate for (60)Co and (137)Cs gamma-rays using spherical cavity chambers were calculated using the EGS4 Monte Carlo system. Mass energy-absorption coefficient ratio and the stopping power ratio were calculated for a 10 cm(3) primary standard graphite-walled ionization chamber from the unfolded energy pulse height distributions of (60)C...