71210 Bioelectromagnetism - Exercises Autumn 2004

Magnetocardiography

1. The most significant difference between the MCG and ECG is
   1. the number of independent components
   2. the information content
   3. the sensitivity distribution
2. The XYZ and ABC lead systems are both orthogonal, and may be either bipolar or unipolar. The only difference between the physical realizations of these two lead systems is the
   1. magnetometer alignment
   2. cost of instrumentation
   3. size of the sensors
3. Proximity effect in MCG refers to the
   1. distance from the center of the heart to the measurement coil
   2. sensitivity concentration of unipolar measurements
   3. distortion-free measurement in spite of the internal inhomogenenities
4. Refer to the Fig. 20.22. in the Textbook. What is the reason for the delay in the maximum peaks of the ECG and MCG?
   1. 90 degree phase shift is seen in the time axis
   2. The sensitivity distributions of these measurements are different
   3. Scaling of the axes
5. Diagnostic performance of MCG is similar to that of the ECG. What is the reason for the combined measurement to have improved performance?
   1. Making double measurements is likely to reduce random errors
   2. Electric and magnetic functioning of the heart are different phenomena
   3. Come on, again, the sensitivity distributions of MCG and ECG are different

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