Data: Head model, ROI definition, desired directional field, n
	Result: Optimal stimulus pattern with at most n current sources
1	ẑ ← z0 // Initialize objective
2	ℒ ← {ℱ0} //Active set
3	t ← 0
4	while ℒ ≠ ø do
5	determination of r // Next branch
6	ℒ ← ℒ – ℱr
7	determination of p(r)
8	determination of branching
	ℱr ⊂ ℛ1 ⋃ ℛ2 … ℛp(r)
9	for i ← 1 to p(r) do
10	ℱt+i ← ℱr ⋂ ℛi
11	calculation of (xt+i, zt+i)
12	if zt+i > ẑ then
13	if xt+i ∈ ℱ then
14	ẑ ← zt+i
15	else
16	ℒ ← ℓ + ℱt+i
17	t ← t + p(r)