get_circ()
Description: This function creates a circular transducer. It is intended to work with the create_circ_arrray functions, but it can be used independently.
Usage
transducer = get_circ(radius);
transducer = get_circ(radius, center);
transducer = get_circ(radius, center, euler);
transducer = get_circ(radius, center, euler, piston_apodization_index);
Arguments
- radius radius of the transducer in m.
- center a 3x1 or 1x3 array with the center coordinate of the element.
- euler_angles a 3x1 or 1x3 array with the rotation of the element in radian. For details about how FOCUS handles Euler angles, see the documentation for rotate_vector_forward.
- piston_apodization_index Type of apodization to use. Must be one of the following:
- 0 uniform - this is the default.
- 1 cosine
- 2 raised cosine
- 3 quadratic
- 4 quartic
Output Parameters
- transducer A FOCUS transducer struct.
Notes
The weight of the transducer is set to 1 and the phase is
set to zero. If you need to focus via phase shifting, you must manually change the phase after the function has run. Piston apodization is currently defined only for this transducer geometry.