Arterial spin-labelling and magnetic resonance spectroscopy as imaging biomarkers for detection of epileptogenic zone in non-lesional focal impaired awareness epilepsy

Egyptian Journal of Radiology and Nuclear Medicine

Table 1 Parameters of the used MRI sequences of the studied patients (n = 26)

MRI sequences	T1WTSE	T2WTSE	FLAIR	PDWTSE	T2*W-GRE	DWI and ADC	Volumetric 3D SPGR T1WI
Type of scan	TSE	TSE	IR-TSE	TSE	GRE	SENSE-SSh-EPI + SPAIR	3D SPGR
Imaging plane	Axial, sagittal and coronal	axial, sagittal and oblique coronal	axial, sagittal and oblique coronal	axial, sagittal and oblique coronal	Axial and oblique coronal	Axial	Axial, sagittal and coronal
TR/TE (msec.)	400–460/4.6–10	3000/80	11000/120	2000/20	3500/30	12000/82	4264/70
TI (msec.)	–	–	2300	–	–	–	–
NEX	2	3	1	1	2	2	1
FOV (mm³)	200 × 230 × 150	220 × 220 × 150	220 × 220 × 150	220 × 220 × 150	220 × 220 × 150	220 × 220 × 150	240 × 240 × 150
ST (mm)	3	3	2	2	2	1	1.5
Flip angle (°)	20	20	90	90	90	90	90
b value (s/mm²)	0	0	0	0	0	100-1000	0
Intersection gap (mm)	0	0	0	0	0	0	0
Matrix	320 × 320	320 × 320	320 × 320	320 × 320	256 × 256	256 × 256	256 × 256
Acquired voxel size (mm³)	1.00 × 1.26 × 3.0	1.00 × 1.42 × 3.0	0.75 × 0.81 × 5	0.75 × 0.81 × 5	0.9 × 1.52 × 5.0	1.49 × 1.50 × 3.0	0.75 × 0.81 × 5
Scan time (min)	5–6	6–7	6–7	6–7	6–7	6–7	6–7

T1W T1-weighted, T2W T2-weighted, TSE turbo spin-echo, min minutes, T1WTSE T1-weighted turbo spin-echo, T2WFSE T2-weighted fast spin-echo, FLAIR fluid attenuation inversion recovery, IR-TSE inversion recovery-turbo spin echo, PDWTSE proton density-weighted turbo spin echo, 3D SPGR T1WI three-dimensional spoiled gradient echo T1WI, T2*-GRE T2*-weighted gradient recalled echo, DWI diffusion-weighted image, SENSE-SSh-EPI sensitivity encoding single shot-echo planar imaging, STIR short tau inversion recovery, TR/TE repetition time/echo time, mm³ cubic millimetres, msec milliseconds, NEX number of excitations, FOV field of view, (°) degrees, s/mm² seconds/square millimetres, mm millimetres, min minutes, ST slice thickness