Are square grid patterns, as shown in Fig. 7.65, useful? Explain.

Comment on the role of the size of the circles placed on the surfaces of sheet metals in determining their formability. Are square grid patterns, as shown in Fig. 7.65, useful? Explain. We note in Fig. 7.65 on p. 400 that, obviously, the smaller the inscribed circles, the more accurately we can determine the magnitude and location of strains on the surface of the sheet


being formed. These are important considerations. Note in the figure, for example, how

large the circles are as compared with the size of the crack that has developed. As for square

grid patters, their distortion will not give a clear and obvious indication of the major and minor

strains. Although they can be determined from geometric relationships, it is tedious work to do


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….