Describe the material properties that have an effect on the relative position of the curves shown in Fig. 7.19.

Describe the material properties that have an effect on the relative position of the curves

 

shown in Fig. 7.19. Observing curves (a) and (c) in Fig. 7.19 on p. 364, note that the former is annealed and the latter is heat treated. Since these are all aluminum alloys and, thus, have the same elastic modulus, the difference in their springback is directly attributable to the difference in their yield stress. Likewise, comparing curves (b), (d), and (e), note that they are all stainless steels and, thus, have basically the same elastic modulus. However, as the amount of cold

work increases (from annealed to half-hard condition), the yield stress increases significantly

because austenitic stainless steels have a high n value (see Table 2.3 on p. 37). Note that these

comparisons are based on the same R/T ratio.

find the cost of your paper

Explain why attenuation is not a big problem in PET.

Consider a 2-D object consisting of two triangle compartments, as shown in Figure P9.4. Suppose a solution containing a 511 KeV gamma ray emitting radionuclide with concentration f = 0.5….

Give the mean and the variance of the reconstructed image, mean[ˆ f(x, y)] and var[ˆ f(x, y)].

Ignoring the inverse square law and attenuation, an approximate reconstruction for SPECT imaging is given by where c˜() =  {||W()} and W() is a rectangular windowing filter that cuts off at = 0…..

Find the numerical responses in each to an event in crystal C(4, 6).

Suppose a PET detector comprises four square PMTs (arranged as a 2 by 2 matrix) and a single BGO crystal with slits made in such a way that it is….