To evaluate \( \frac{2i - 18i}{2} \), we first simplify the expression in the numerator.
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Combine the terms in the numerator:
\[ 2i - 18i = -16i \]
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Now, substitute that back into the fraction:
\[ \frac{-16i}{2} \]
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Divide the numerator by the denominator:
\[ -16i \div 2 = -8i \]
Now, we express \(-8i\) in the form \(a + bi\). Here, \(a = 0\) and \(b = -8\).
Thus, the final answer is
\[ \boxed{0 - 8i} \]