A Structure Design Method for Reduction of MRI Acoustic Noise

Table 4

Maximum SPL reductions of the frequency bands of interest in the central gap by applying horn structures.

Frequency bands of interest	100–140 Hz	200–240 Hz	305–345 Hz	660–720 Hz
Selected criteria (dB)	7.0	1.0	0.8	2.0
Optimal horn length (cm)	50–80	50–100	35–55	55