Slices excited in uniform phantom by constant and variable density spiral 3D TRF pulses. The slices were tailored with “MR NO KA OI” (Hawaiian for “MR is number one”). (a) Slice excited using constant density pulse with 0.44 cm xy-resolution and 43 ms length. (b) Slice excited using constant density pulse with 0.625 cm xy-resolution and 25 ms length. (c) Slice excited using variable density pulse with 0.44 cm xy-resolution and 25 ms length. (d) Profile along dotted line in (a-c). The dotted, dashed, and solid lines correspond to (a), (b), and (c), respectively.