When hypercomplex acquisition is used, echo and antiecho are recorded.
Echo is shifting along a positive slope while anti-echo is shifting along the opposite slope.
One should add an option to shifting to apodize along both slopes to account for echo and anti-echo.
Usually anti-echo disappears quickly to negative t2 time, but some implementations (with CPMG for example) could record both pathway with a shifted start. In that case the anti-echo is wrongly decreased.
This can apply to MQMAS experiments but also to DQ-SQ or SQ-SQ experiments.
When hypercomplex acquisition is used, echo and antiecho are recorded. Echo is shifting along a positive slope while anti-echo is shifting along the opposite slope. One should add an option to shifting to apodize along both slopes to account for echo and anti-echo. Usually anti-echo disappears quickly to negative t2 time, but some implementations (with CPMG for example) could record both pathway with a shifted start. In that case the anti-echo is wrongly decreased. This can apply to MQMAS experiments but also to DQ-SQ or SQ-SQ experiments.