TABLE 1.

Acquisition and pulse parameters for the four cohorts

	Cohort 1 (DMD: n = 18; HC: n = 11)	Cohort 2 (DMD: n = 22; HC: n = 12)	Cohort 3 (BMD: n = 23; HC: n = 13)	Cohort 4 (SMA: n = 29; HC: n = 20)
Anatomical location	Upper arm	Lower leg	Lower leg	Upper leg
Sequence parameters
First TE	8.0 ms	8.0 ms	8.0 ms	7.6 ms
Time between echoes	8.0 ms	8.0 ms	8.0 ms	7.6 ms
Number of echoes	17	17	17	17
TR	3000 ms	3000 ms	3000 ms	4598 ms
Slice thickness	10 mm	10 mm	10 mm	6 mm
Slice gap	20 mm	20 mm	20 mm	0 mm
Slices	5	5	5	13
Resolution	2.0 × 2.0 mm	1.6 × 1.6 mm	1.6 × 1.6 mm	3.0 × 3.0 mm
ΔChemical shift*	0.1 mm	1.1 mm	1.1 mm	0.9 mm
Excitation pulse
Bandwidth	1000 Hz	1000 Hz	1000 Hz	768 Hz
Gradient strength	1.78 mT/m	1.78 mT/m	1.78 mT/m	2.28 mT/m
Refocusing pulse
Bandwidth	632 Hz	632 Hz	632 Hz	486 Hz
Gradient strength	1.80 mT/m	1.48 mT/m	1.48 mT/m	1.90 mT/m

Cohort 1 included Duchenne’s muscular dystrophy patients and healthy controls; cohort 2 included Duchenne’s muscular dystrophy patients and healthy controls; cohort 3 included Becker muscular dystrophy patients and healthy controls; and cohort 4 included spinal muscular atrophy patients and healthy controls.

Abbreviations: BMD, Becker muscular dystrophy; DMD, Duchenne’s muscular dystrophy; HC, healthy control; SMA, spinal muscular atrophy.

^*Chemical‐shift displacement difference in slice direction between excitation and refocusing pulse for fat.