Table 2:

MR imaging parameters and schedule^{^a}

Coil	Sequence	TE (ms)	TI (ms)	TR (ms)	Matrix	FOV (cm)	In-Plane Resolution (mm)	Thickness (mm)	Flip Angle	Bandwidth (Hz)	Time to Acquire (min:s)
8-Channel	Cisternography (FIESTA)	3		6	320 × 320	18	0.56 × 0.56	1	55°	163	4:27
	2D FLAIR	122	2500	9454	320 × 320	18	0.56 × 0.56	2	90°	122	4:06
	T1 spin-echo^{^b}	9		400	320 × 320	18	0.56 × 0.56	2	90°	163	4:19
3-Inch surface	Cisternography (FIESTA)	4		8	320 × 320	12	0.38 × 0.38	1	55°	163	4:35
	2D FLAIR (3 pt)	124	2000^{^c}	10,000	320 × 320	12	0.38 × 0.38	2	90°	122	4:12
	2D FLAIR (3 pt)	123	2000	9000	320 × 320	12	0.38 × 0.38	2	90°	122	4:24
	T1 spin-echo^{^b}	11		500	320 × 320	12	0.38 × 0.38	2	90°	163	5:10

Note:—pt indicates patients.
↵a Protocol 1 (n = 3), 1 scan session: 20–28 hours post-IT contrast, includes pre- and post-IV contrast images. Protocol 2 (n = 2), 3 scan sessions: 1) pre- and post-IV contrast images (no IT), 2) 2 hours post-IT contrast/4 hours post-IV contrast, 3) 20–28 hours post-IT contrast/30 hours post-IV contrast. Protocol 2B (n = 1; scheduling conflict precluded pre-IT injection imaging as above in protocol 2 number 1), 2 scan sessions: 1) 20 hours post-IT contrast with pre-and post-IV contrast images, 2) 25 hours post-IT contrast/4 hours post-IV contrast.
↵b Parameters for T1 pre- and post-IV contrast scans did not change.
↵c FLAIR TI was varied from 1800 to 2800 ms for 2 patient scans, with all other parameters fixed.