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Figure 4. Images at the same level of the oesophagus in one volunteer. The number of signal averages(NSA) is increased from (a) 4 to (b) 8. All other parameters are maintained (matrix 256 mmx256 mm, repetition time (TR) 5446 ms, field of view (FOV) 225 mm, echo time (TE) 80 ms, turbo spin echo (TSE) 16). The higher NSA improves image quality by improving conspicuity of the oesophageal wall layers: the high signal submucosa (white arrow) and lower signal muscularis propria (arrowhead); the perioesophageal tissues (black arrow) and wall of the aorta.
