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Fig. 3D —38-year-old man with lunate avascular necrosis (AVN).
Diffusion-weighted imaging (DWI) performed at same level with two different
techniques: echo-planar imaging (EPI)–based DWI (B) and
non–Carr-Purcell-Meiboom-Gill (non-CPMG) single-shot fast spin-echo
(SSFSE) DWI (C), both at b = 600 mm2/s, and corresponding,
respectively, apparent diffusion coefficient (ADC) maps (D and
E). AVN is more readily seen on non-CPMG SSFSE images than EP images.
Mean ADC (± SD) measured from capitate bone is 0.58 ± 0.19 and
0.31 ± 0.11 x 10–3 mm2/s for EPI and
non-CPMG SSFSE DWI, respectively. ADC measured from lunate is 1.53 ±
0.58 and 1.44 ± 0.49 x 10–3 mm2/s for
EPI and non-CPMG SSFSE DWI, respectively. Higher mean ADC values seen in
lunate reflect increased diffusion due to accompanying bone marrow edema.
