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a) Not magnified enough
b) Fetus not in midsagittal
c) NT line not crisp and clear
d) Amnion not seen
e) Head flexed or over extended
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f) Calipers not placed properly on inner aspect of lines
g) Calipers not oriented at right angles to the fetus
h) + calipers not used
i) Calipers not measuring the widest distance
j) Good image, nothing wrong
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