Head and neck paragangliomas: diffusion weighted and dynamic contrast enhanced magnetic resonance imaging characteristics

Table 1 MR imaging protocol

Sequences	T1WI	T2WI	T2WI	DWI	DCE	T1WI^a	T1WI^a
Plane	Axial	Axial	Coronal	Axial	Axial	Axial	Coronal
TR (ms)	600	4200	3700	2775	4.8	540	540
TE (ms)	9.9	94.6	81.4	70	2.2	8.8	9.4
NEX	2	2	3	8	1	2	2
Slice thickness/gap (mm)	5/1	5/1	5/1	5/0.5	5/0.5	5/1	5/1
Matrix (mm)	288 × 192	320 × 224	320 × 224	128 × 128	128 × 128	288 × 192	288 × 192
FOV (cm)	24 × 24	24 × 24	24 × 24	24 × 24	24 × 24	24 × 24	22 × 22
FS	No	No	Yes		Yes	No	Yes

DCE dynamic contrast-enhanced, DWI diffusion weighted imaging, FOV field of view, NEX number of excitations, T1WI T1-weighted imaging, T2WI T2-weighted imaging, TE echo time (msec), TR repetition time
^a contrast enhanced sequences

ISSN: 1471-2342