Question

# 7. Calculate the 270° pulse width for a radio frequency field strength of 200 kHz. 8....

7. Calculate the 270° pulse width for a radio frequency field strength of 200 kHz.

8. What would be an approximate radio frequency excitation band width for a 90° pulse width of 1.25 microsecond?

7.

The Flip angle (), RF field strength(B) and pulse width (t) are related as follows:

Hence, for a 270 flip angle, and B = 200 kHz, the pulse width t is

Hence, the pulse width is 3.75 microseconds.

8.

Using the same relation, the B value will give the excitation bandwidth.

t = 1.25 micro seconds.

= 90

Hence,

Hence, the excitation bandwidth for 90 pulse is 200 kHz.

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