background: photon attenuation as an inevitable physical phenomenon influences on the diagnostic information of spect images and results to errors in accuracy of quantitative measurements. this can be corrected via different physical or mathematical approaches. as the correction equation in mathematical approaches is nonlinear, in this study a new method of linearization called ‘piece wise line...

a selective and sensitive method for determination of cadmium and zinc is presented. the method is based on adsorptive accumulation of the complexes of cd (ii) and zn (ii) ions with 4-amiono-5-methyl-2,4-dihydro-3h-1,2,4-triazol-3-tion (mmtt) onto hanging mercury drop electrode (hmde), followed by reduction of the adsorbed species by voltammetric scan using differential pulse modulation. the li...

Testing of present day VLSI circuits with standard linear scan procedures using the Built-In Self Test (BIST) takes a significant amount of time, with the sheer number of sequential elements running into tens of thousands. Using the Illinois Scan Architecture, we propose to significantly reduce the test application time, by dividing the scan chain into multiple partitions and shifting in the sa...

The paper approaches the problem of pre-filtering the interferometric SAR images to remove the geometrical decorrelation. This filtering cancels the amplitude components relative to the wavenumbers not illuminated in both passes. The design of optimum space-varying linear filters is performed by estimating the interferogram, given the two data takes, with the least square error. The algorithm i...

there are several techniques in use for non-linear refractive index measurement, namely, interferometric techniques, in which conventional inter-ferometers are used, degenerate for wave mixing (dfwm), and z-scan, each of these techniques suffers from some shortcmings. for example conventional interferometers like fabry-perot and twyman-green need high quality optical components, unwanted reflec...

Background: Photon attenuation as an inevitable physical phenomenon influences on the diagnostic information of SPECT images and results to errors in accuracy of quantitative measurements. This can be corrected via different physical or mathematical approaches. As the correction equation in mathematical approaches is nonlinear, in this study a new method of linearization called ‘Piece ...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 background: computed tomography (ct) scan without contrast is the modality of choice for diagnosis of stroke. however, routine brain ct scan, with linear processing has some limitations in early diagnosis of ischemic stroke. the aim of this study was to evaluate and compare the sensitivity and specificity of processed ct i...