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BME 325 HW6 2010

# BME 325 HW6 2010 - BME 325 INTRODUCTION TO MEDICAL IMAGING...

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BME 325 INTRODUCTION TO MEDICAL IMAGING FALL 2010-2011 A. SAHAKIAN ASSIGNED Friday 11/12/10 DUE Friday 11/19/10 1) For a 1.5 T MRI system (imaging protons) having a field gradient of 2 G/cm, determine the center frequency and bandwidth of a slice-selection pulse for a 1.0 cm thick slice. Sketch the envelope of the RF pulse and give numerical value of time between the main two envelope zero crossings (i.e. the width of the main lobe of the RF pulse envelope). 2) Consider a simplified Maxwell coil pair (i.e. a Helmholtz coil pair with the current flowing in opposite directions in the two coils) being used to generate a 2 G/cm gradient in the Z direction . Each coil has 50 turns of wire and a radius of 20 cm. The spacing between coils is 35 cm. Estimate the current required in this coil pair to give the 2 G/cm gradient. Try to use reasonable simplifying approximations to get a simple approximate answer. Hint: Consider the approximate field at the center of each coil and the distance between the coils.

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BME 325 HW6 2010 - BME 325 INTRODUCTION TO MEDICAL IMAGING...

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