Small bowel MR enterography: problem solving in Crohn’s disease

Insights into Imaging

Table 1 Parameters for MRI protocol

Parameter	(1) True FISP		(2) Cine True FISP	(3) Diffusion	(4) T1 volumetric fat-saturated sequence^{a, b}		(5) HASTE^b
Parameter	Axial	Coronal	Coronal	Axial	Axial	Coronal	Axial	Coronal^c
TR/TE (ms)	4.09/1.77	4.19/2.1	74/1.48	5,600/82	5.43/2.41	5.43/2.36	900/83	1,000/217
Flip angle (degrees)	53	70	63	–	10	10	150	139
Field of view (mm)	400	450	450	350	400	450	400	400
Parallel imaging factor	2	0	2	2	2	2	2	2
Section thickness (mm)	4	4	8	5	3	3	6	5
Intersection gap (mm)	0	3	1.6	0	0	0	0	0
Number of sections per stack	50	20	18	40-60	64	64	20	20
Breath-hold time per stack	18	14	Free breathing	Free breathing	18	14	18	22
Number of stacks	2 or 3	1	1	2	2 or 3	1	2 or 3	1 or 2
Bandwidth (Hz)	454	488	965	1302	300	300	416	130

True FISP true fast imaging with steady state precession, HASTE half-Fourier acquired single shot turbo spin echo, TR repetition time, TE echo time
^aThe axial and coronal sequences are performed before and following intravenous administration of gadolinium
^bThese sequences are performed following intravenous spasmolytic (e.g. buscopan) unless contraindicated
^cThe coronal HASTE sequence can be performed with fat saturation to help distinguish between submucosal fat and oedema