Letters: Comment on "Effects of multi-scattering on the performance of a single-beam acoustic manipulation device"

The concern addressed in the present commentary is to point out the omission of the azimuthal component Fϕ of the axial acoustic radiation force provided in M. Azarpeyvand, M. A. Alibakhshi, R. Self, "Effects of multi-scattering on the performance of a single-beam acoustic manipulation device," IEEE Trans. Ultrason. Ferroelectr. Freq. Control, vol. 59, no. 8, pp. 1741-1749, 2012, which may suggest a miscalculation of the radiation force function Y
_m
and its related numerical computations.