Table 1.

Summary of EPI sequences tested.

Sequence	TR (s)	TA (s)	TE (ms)	Bandwidth (Hz/Px)	# of scans	dBA
Standard	2.8	2.8	30	2230	284	90.2
Sparse	11.2	2.8	30	2230	71	n/a
Matched Standard	2.8	2.8	44	1220	284	n/a
Quiet	2.8	2.8	44	1220	284	67.4

Note: Sound levels were measured for the Standard and Quiet sequences with an MR-compatible microphone placed inside an empty scanner. Measurements were not taken for the Matched Standard sequence but it was uniformly judged to be louder than the Quiet sequence, and softer than the Standard sequence. During the Sparse sequence the only noise came from ambient scanner noise (e.g., helium pumps).