A Structure Design Method for Reduction of MRI Acoustic Noise

Table 5

Maximum SPL reductions both in and outside the central gap at the frequency bands of interest by applying the horn structure with an optimal length of 55 cm.

Frequency band	100–140 Hz	200–240 Hz	305–345 Hz	660–720 Hz
In the central gap	7.4	1.2	0.9	2.1
Outside the central gap	5.4	1.6	1.2	0.6