Particle analysis in an acoustic cytometer

1. A method for acoustically manipulating one or more particles, comprising:

flowing, along a flow axis, a fluid containing particles therein;

applying acoustic radiation pressure to the fluid and acoustically manipulating the one or more particles;

acoustically orienting the particles so as to place the particles into substantially the same rotational orientation as one another and so as to place the particles into substantially the same rotational orientation relative to the flow axis; and

reviewing at least one of the particles.

2. The method of claim 1 , wherein reviewing comprises analyzing at least one of the particles.

3. The method of claim 1 , wherein reviewing comprises sorting at least one of the particles.

4. The method of claim 1 , comprising flowing the fluid through a flow cytometer.