71210 Bioelectromagnetism - Exercises Autumn 2004

Theoretical Methods for Analyzing Volume Sources and Volume Conductors

  1. Unit for double layer dipole moment per unit area is
    1. [Am]
    2. [A/m]
    3. [A/m^2]
  2. Solid angle is used to
    1. estimate isopotential lines at certain distances from the double layer
    2. Determine double layer polarity and magnitude
    3. estimate the potential at certain field point of observation due to a double layer
  3. A closed uniform double layer having magnitude p produces potential outside the source that is
    1. depending on the distance to the center of the source
    2. proportional to p*area of the double layer
    3. zero
  4. Which of the following DOES NOT contribute to the lead vector
    1. source location
    2. source magnitude
    3. volume conductor boundary
    4. volume conductor inhomogenenities
    5. observation location
  5. Measuring lead vectors in an inhomogeneous trunk model, one may obtain representations similar to the
    1. Frank triangle
    2. Einthoven triangle
    3. Burger triangle
  6. Image Surface is
    1. similar in shape with the associated volume conductor shape
    2. surface formed out of lead vector tips mapped as a function of surface location
    3. surface formed out of lead vector tips mapped as a function of source location
    4. all of the above
  7. Measurement lead's capacity to measure sources at different locations in a volume conductor is given by
    1. lead field
    2. sensitivity distribution
    3. both of the above
  8. Lead field may be obtained by
    1. energizing each source location one at the time
    2. reciprocal current injection through the measurement leads
    3. measuring the field due to a source at each location
  9. Lead field theory applies to
    1. electric measurements/stimulation
    2. magnetic measurements/stimulation
    3. bioimpedance measurements
    4. all of the above
  10. Gabor-Nelson theorem may be applied to find out the equivalent dipole of the entire volume conductor
    1. True
    2. False

Show correct answers

Back to exercises page