Provide some reasonable values of τ , T TR tip angle, and other parameters that should be used in the new pulse sequence.

We try using the pulse sequence shown in Figure P12.2 to image the human brain. A π/2 pulse is applied to the brain while in equilibrium.

Figure P12.2 Pulse sequence for Problem 12.15

Suppose the duration of the RF pulse is negligible. The FID signal is sampled at time τ and the pulse repetition interval is TR.

(a) We use T TRR= 6, 000 ms, τ = 20 ms. Is this a T T2-weighted contrast? If not, what modification isneeded to obtain T T2-weighted images?

(b) Sketch the modified pulse sequence.

(c) Provide some reasonable values of τ , T TR tip angle, and other parameters that should be used in the new pulse sequence.

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….