Explain why a metal with a fine-grain microstructure is better suited for fine blanking than a coarse-grained metal.

Explain why a metal with a fine-grain microstructure

 

is better suited for fine blanking

than a coarse-grained metal.

A fine-blanking operation can be demanding;

the clearances are very low, the tooling is elaborate

(including stingers and a lower pressure

cushion), and as a result the sheared surface

quality is high. The sheared region (see Fig. 7.6

on p. 353) is well defined and constrained to

a small volume. It is beneficial to have many

grain boundaries (in the volume that is fracturing)

in order to have a more uniform and

controlled crack.

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….