25 cm We intend to acquire a magnetic resonance image of the object illustrated below. (Assume...

Transcribed Image Text:

25 cm We intend to acquire a magnetic resonance image of the object illustrated below. (Assume infinite slew rate gradient pulses) a. Assume you are selecting a slice in the z-direction. Which direction would you choose for phase encoding and why? (2pts) b. What are the maximum allowable Akx, and Aky, for (2 pts) i. 128 samples 256 samples 512 samples c. What is the minimum receiver bandwidth for the following frequency encode gradient amplitudes? (3 pts) 10 mt/m 25mT/m 45 mT/m d. If 256 points are sampled, what is the frequency encoding gradient duration (t) corresponding to each of your answers in part c? (3 pts) ii. iii. i. ii. iii. e. What is the incremental change in phase encode gradient amplitude (AGPe) for the maximum allowed Ak for the following phase encode pulse durations? (3 pts) i. 1095 ii. 40 cm iii. 2.505 4.5 005 25 cm We intend to acquire a magnetic resonance image of the object illustrated below. (Assume infinite slew rate gradient pulses) a. Assume you are selecting a slice in the z-direction. Which direction would you choose for phase encoding and why? (2pts) b. What are the maximum allowable Akx, and Aky, for (2 pts) i. 128 samples 256 samples 512 samples c. What is the minimum receiver bandwidth for the following frequency encode gradient amplitudes? (3 pts) 10 mt/m 25mT/m 45 mT/m d. If 256 points are sampled, what is the frequency encoding gradient duration (t) corresponding to each of your answers in part c? (3 pts) ii. iii. i. ii. iii. e. What is the incremental change in phase encode gradient amplitude (AGPe) for the maximum allowed Ak for the following phase encode pulse durations? (3 pts) i. 1095 ii. 40 cm iii. 2.505 4.5 005