. 2021 Jul 21;11(8):1310. doi: 10.3390/diagnostics11081310

Table 2.

Results of the survey regarding brain and spine MRI at follow-up.

FOLLOW-UP
BRAIN MRI
MRI SEQUENCES	Number of Affirmative Answers	Percentage	Additional Questions		Number of Answers	Percentage
*T1-weighted*
2D SE-T1w (pre-Gd)	28	60.9%	slice thickness	≤3 mm	10	35.7%
			slice thickness	>3 mm	18	64.3%
			gap	Yes	12	42.9%
			gap	No	16	57.1%
3D SE-T1w (pre-Gd)	4	8.7%	voxel size	<1 mm (isotropic)	2	66.7%
				1 mm (isotropic)	1	33.3%
				other	0	0.0%
3D GrE-T1w (pre-Gd)	10	21.7%	voxel size	<1 mm (isotropic)	1	10.0%
				1 mm (isotropic)	9	90.0%
				other	0	0.0%
2D SE-T1w (post-Gd)	21	45.6%	slice thickness	≤3 mm	9	42.9%
			slice thickness	>3 mm	12	57.1%
			gap	Yes	5	23.8%
			gap	No	16	76.2%
			delay	≤5′	12	57.1%
			delay	>5′	8	38.1%
3D SE-T1w (post-Gd)	9	19.6%	voxel size	<1 mm (isotropic)	3	33.3%
				1 mm (isotropic)	5	55.5%
				other	1	11.1%
			delay	≤5′	6	66.6%
			delay	>5′	3	33.3%
3D GrE-T1w (post-Gd)	23	50.0%	voxel size	<1 mm (isotropic)	3	13.0%
				1 mm (isotropic)	18	78.3%
				other	0	0.0%
			delay	≤5′	5	21.7%
			delay	>5′	16	70.0%
*T2-weighted*
PD/T2w	1	2.2%	slice thickness	≤3 mm	0	0.0%
			slice thickness	>3 mm	1	100%
			gap	Yes	0	0.0%
			gap	No	1	100%
2D T2w	31	67.4%	slice thickness	≤3 mm	14	45.2%
			slice thickness	>3 mm	15	48.4%
			gap	Yes	11	35.5%
			gap	No	18	58.1%
3D T2w	1	2.2%	voxel size	<1 mm (isotropic)	1	100%
				1 mm (isotropic)	0	0.0%
				other	0	0.0%
2D FLAIR	11	23.9%	slice thickness	≤3 mm	3	27.3%
			slice thickness	>3 mm	8	72.7%
			gap	Yes	2	18.2%
			gap	No	9	81.8%
3D FLAIR	37	80.4%	voxel size	<1 mm (isotropic)	9	24.3%
				1 mm (isotropic)	23	62.2%
				other	5	13.5%
*Sequences for cortical lesions detection*
2D DIR	3	6.5%	slice thickness	≤3 mm	3	100%
			slice thickness	>3 mm	0	0.0%
			gap	Yes	0	0.0%
			gap	No	3	100%
3D DIR	11	23.9%	voxel size	<1 mm (isotropic)	3	27.3%
				1 mm (isotropic)	7	63.6%
				other	1	9.1%
2D PSIR	4	8.7%	slice thickness	≤3 mm	2	50.0%
			slice thickness	>3 mm	1	25.0%
			gap	Yes	2	50.0%
			gap	No	1	25.0%
3D PSIR	3	6.5%	voxel size	<1 mm (isotropic)	1	33.3%
				1 mm (isotropic)	2	66.7%
				other	0	0.0%
None	27	58.7%
*Sequences for optic nerves evaluation*
STIR-T2w	24	52.2%	slice thickness	≤3 mm	22	91.7%
			slice thickness	>3 mm	2	8.3%
			gap	Yes	6	25.0%
			gap	No	18	75.0%
Post-Gd Fat-Sat T1w	16	34.8%	slice thickness	≤3 mm	16	100%
			slice thickness	>3 mm	0	0.0%
			gap	Yes	4	25.0%
			gap	No	12	75.0%
None	15	32.6%
*Additional sequences*
DWI	44	95.6%
GrE-T2*	15	32.6%	slice thickness	≤3 mm	4	26.7%
			slice thickness	>3 mm	11	73.3%
			gap	Yes	6	40.0%
			gap	No	9	60.0%
2D SWI	7	15.2%	slice thickness	≤3 mm	5	71.4%
			slice thickness	>3 mm	2	28.6%
			gap	Yes	2	28.6%
			gap	No	5	71.4%
3D SWI	12	26.1%	voxel size	<1 mm (isotropic)	3	25.0%
				1 mm (isotropic)	9	75.0%
				other	0	0.0%
None	0	0.0%
SPINE MRI
*MRI SEQUENCES*	*Number of Affirmative Answers*	*Percentage*	*Additional Questions*		*Number of Answers*	*Percentage*
*T2-weighted*
T2w	38	82.6%	acquisition plane	sagittal	38	100%
			acquisition plane	axial	12	31.6%
			slice thickness on sagittal acquisition	≤3 mm	37	97.4%
			slice thickness on sagittal acquisition	>3 mm	1	2.6%
			gap on sagittal acquisition	Yes	14	36.8%
			gap on sagittal acquisition	No	24	63.2%
PDw	2	4.3%	acquisition plane	sagittal	2	100%
			acquisition plane	axial	0	0.0%
			slice thickness on sagittal acquisition	≤3 mm	2	100%
			slice thickness on sagittal acquisition	>3 mm	0	0.0%
			gap on sagittal acquisition	Yes	2	100%
			gap on sagittal acquisition	No	0	0.0%
STIR-T2w	40	87.0%	acquisition plane	sagittal	40	100%
			acquisition plane	axial	5	12.5%
			slice thickness on sagittal acquisition	≤3 mm	38	95.0%
			slice thickness on sagittal acquisition	>3 mm	2	5.0%
			gap on sagittal acquisition	Yes	16	40.0%
			gap on sagittal acquisition	No	24	60.0%
*T1-weighted and inversion recovery*
PSIR	2	4.3%	acquisition plane	sagittal	2	100%
			acquisition plane	axial	0	0.0%
			slice thickness on sagittal acquisition	≤3 mm	2	100%
			slice thickness on sagittal acquisition	>3 mm	0	0.0%
			gap on sagittal acquisition	Yes	1	50.0%
			gap on sagittal acquisition	No	1	50.0%
2D SE-T1w (pre-Gd)	22	47.8%	acquisition plane	sagittal	22	100%
			acquisition plane	axial	5	22.7%
			slice thickness on sagittal acquisition	≤3 mm	22	100%
			slice thickness on sagittal acquisition	>3 mm	0	0.0%
			gap on sagittal acquisition	Yes	8	36.4%
			gap on sagittal acquisition	No	14	63.6%
3D GrE-T1w (pre-Gd)	2	4.3%	acquisition plane	sagittal	2	100%
			acquisition plane	axial	1	50.0%
			slice thickness on sagittal acquisition	≤3 mm	2	100%
			slice thickness on sagittal acquisition	>3 mm	0	0.0%
			gap on sagittal acquisition	Yes	0	0.0%
			gap on sagittal acquisition	No	2	100%
2D SE-T1w (post-Gd)	36	78.3%	acquisition plane	sagittal	36	100%
			acquisition plane	axial	9	25.0%
			slice thickness on sagittal acquisition	≤3 mm	33	91.6%
			slice thickness on sagittal acquisition	>3 mm	2	5.5%
			gap on sagittal acquisition	Yes	13	36.1%
			gap on sagittal acquisition	No	22	61.1%
			delay	≤5′	17	47.2%
			delay	>5′	19	52.8%
3D GrE-T1w (post-Gd)	4	8.7%	acquisition plane	sagittal	4	100%
			acquisition plane	axial	1	25.0%
			slice thickness on sagittal acquisition	≤3 mm	3	75.0%
			slice thickness on sagittal acquisition	>3 mm	1	25.0%
			gap on sagittal acquisition	Yes	1	25.0%
			gap on sagittal acquisition	No	3	75.0%
			delay	≤5′	0	0.0%
			delay	>5′	4	100%

SE = spin-echo; GrE = gradient-echo; FLAIR = fluid attenuated inversion recovery; DIR = double inversion recovery; PSIR = phase sensitive inversion recovery; Fat-Sat = fat saturated; DWI = diffusion weighted imaging; SWI = susceptibility weighted imaging; PD = proton density; STIR = short tau inversion recovery; Gd = gadolinium.