Table 2. Characteristics of the Sequence Parameters During Brain MRI.

Field Strength	Pulse Sequence	TR (ms)	TE (ms)	ETL	Duration (min)	Est. SAR (W/kg)
1.5T/3.0T	AX T2 FSE	4000 / 3000	102.8 / 80	11 / 6	2:32 / 2:21	1.17 / 1.6
1.5T/3.0T	AX T1 FSE	450 / 360	7.4 / 10	8 / 7	2:07 / 2:38	1.63 / 2.6
1.5T/3.0T	AX T2 FLAIR	8800 / 150	150 / 125	6 / 17	3:31 / 2:37	0.67 / 1.03
1.5T/3.0T	AX Diffusion	14000 / 9000	112 / 60		2:03 / 1:21	0.04 / 0.32
1.5T/3.0T	SAG T1 FSE	600 / 450	8 / 10	9 / 6	2:20 / 2:48	1.21 / 2.2
1.5T/3.0T	COR T2 FSE	4000 / 3000	105 / 80	12/6	2:57 / 2:32	1.09 / 1.7
1.5T/3.0T	AX T1 FLAIR	2800 / 2500	25 / 9.8	10/5	2:59 / 3:12	1.45 / 2.5
1.5T/3.0T	SAG T1 FLAIR	2800 / 2500	25 / 9.8	10/6	2:38 / 2:43	1.35 / 2.4
1.5T/3.0T	COR T1 FLAIR	2800 / 2500	25 / 9.8	10/5	2:36 / 2:40	1.45 / 2.5

Abbreviations: AX, axial; SAG, sagittal; COR, coronal; TR, repetition time; TE, echo time; ETL, echo train length; FOV, field of view; FSE, fast spin echo; FLAIR, fluid-attenuated inversion recovery; Est. SAR, estimated SAR; based on the entered weight (70 kg), was obtained with consent from a healthy male adult donor; each pulse sequence parameter was compared between the GE systems (1.5 T Signa and 3.0 T HDx), due to the same MR system’s inner workings; 3.0 T Achieva systems could not be identified with Est. SAR