Question

PHYS/BIOL 464 Medical Imaging Instrumentation

MRI HW 8A

1. For a scanner with a maximum gradient strength of 20 mT m^-1 and a minimum transmitted bandwidth of 0.9 kHz, what is the thinnest slice that can be selected? (? = 42.6 MHz T^-1).

2. Which of the following is the bandwidth of a pulse with frequencies from 60.0015 to 60.0045 MHz?

(a) 3 kHz (b) 3 MHz (c) 0.3 Mhz (d) 60.0030 MHz.

3. Convert the following gradient strengths, expressed in terms of frequency, into T/m. (Assume ? = 42.6 MHz/T).

(a) 2 MHz/m; (b) 1 MHz/m; (c) 0.3 MHz/m.

4. Calculate the slice thickness for each of the gradients in problem 3 if the pulse bandwidth is 1.5 kHz.

5. Using the field gradient shown, which type of slice will be selected? Transaxial, Sagattal, or Coronal?

Answer 1