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Fig. 2C —46-year-old woman with right femoral head 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 left femoral head is 0.51 ± 0.12
and 0.32 ± 0.14 x 10–3 mm2/s for EPI
and non-CPMG SSFSE DWI, respectively. ADC measured from right femoral head is
1.49 ± 0.61 and 1.40 ± 0.51 x 10–3
mm2/s for EPI and non-CPMG SSFSE DWI, respectively. This reflects
increased diffusion due to accompanying bone marrow edema. Please note
increased contrast-to-noise ratio and higher image quality obtained with
non-CPMG technique.
