Table 1.

Imaging parameters. The proposed method was tested on three different clinical scanners.

		GE MR750 (S1)	GE Signa HDxt (S2)	GE Signa PET/MR (S3)
GIRF measurement	RF pulse	24μs hardpulse	24μs hardpulse	24μs hardpulse
	Np	401	401	401
	Flip angle (degree)	6	6	6
	Slew rate (mTm−1ms−1)	200	118	118
	# of input gradient	21	15	21
	Pre-dephaser (mTm−1)	21.7	11.4	21.0
	Input gradients (mTm−1)	7~31	6.7~20	10~30
	Spacing (μs)	464	476	588
	TR(ms)	4.4	4.4	4.4
	Sampling rate (kHz)	500	250	500
	# of data points	988	378	982
	RF Coil	8-ch receive only head coil
	Scan time (sec)	106	75	106
		3D UTE	2D Spiral	3D Ramp sampling
Imaging experiment	RF pulse	24μs hardpulse	Sinc pulse	24μs hardpulse
	Flip angle (degree)	6	30	6
	TE (ms)	0.09	2.42	Cartesian: 1.06, 1.97, 2.87, 3.77 Ramp sampling: 0.85, 1.49, 2.13, 2.77
	TR (ms)	3.3	13	Cartesian: 5.2 Ramp sampling: 3.7
	Sampling rate (kHz)	500	250	500
	# of data points	415	512	Cartesian: 1234 Ramp sampling: 1830
	# of TR	80000	48	101×31
	RF coil	8-ch receive only head coil	Single CH T/R coil	8-ch receive only head coil
	Scan time	4min 28 sec	0.6 sec	Cartesian: 16.3 sec Ramp sampling: 11.6 sec
SPI-based gradient measurement	Np	401	401	401
	TR (ms)	3.3	13	3.7
	Reference time, tr (ms)	0.29	2.94 for x-axis 3.18 for y-axis	21
	Sampling rate (kHz)	500	250	500
	# of data points	415	512	1830
	RF coil	8-ch receive only head coil
	Scan time	4sec	quick: 42sec extensive: 385sec	1.5sec