Explain why scalloping occurs.

In opening a can using an electric can opener, you will note that the lid often develops a scalloped periphery. (a) Explain why scalloping occurs. (b) What design changes for the can


opener would you recommend in order to minimize or eliminate, if possible, this scalloping

effect? (c) Since lids typically are recycled or discarded, do you think it is necessary or worthwhile to make such design changes? Explain. By the student. The scalloped periphery is

due to the fracture surface moving ahead of the shears periodically, combined with the loading

applied by the two cutting wheels. There are several potential design changes, including

changing the plane of shearing, increasing the speed of shearing, increasing the stiffness of the

support structure, or using more wheels. Scallops on the cans are not normally objectionable,

so there has not been a real need to make openers that avoid this feature.

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….