An imaging plane, perpendicular to the ground, the coronal plane separates the anterior from the posterior part (the front from the back).

Correlation is a mathematical procedure, used in ultrasound to quantify the similarity between two signals. Cross correlation of successive ultrasound echoes can be used to quantify movement of tissue, including blood.

(TIC) The cranial bone thermal index is an exposure model for the case that the ultrasound beam passes through bone near the beam entrance into the body.

Cross talk is an ultrasound artifact in which strong sound signals in one directional channel leak into another, appearing as a mirror image of the spectral display on the opposite side of the baseline. Cross talk distinguishes the condition of undesired crossover of transmitted sound waves into the receiving transducer in a continuous wave Doppler system.
Also called Mirror Artifact.

Cross-section scattering is a measure of the scattering strength of a point scatterer. The scattering strength is dependent on the size of the scatterer, the density and compressibility of the scatterer and the surrounding medium, and the ultrasound wavelength.
If a transducer emits ultrasound with a total acoustic power of P, and the power is assumed to be uniform distributed over the US beam cross-sectional area, then the ultrasound intensity at a certain range, is defined by:
I = P/A
where I is the intensity, and A is the cross-sectional beam area at that range.
A point scatterer located in the ultrasound beam at this range, will scatter the ultrasound with a total acoustic power of Ps, defined by:
Ps = I s
where s is the scattering cross-section of the point scatterer.