Grayscale Imaging and Machine Assumptions

Vocabulary flashcards covering basic principles of refraction, reflection, and the six fundamental machine assumptions in grayscale imaging.

Refraction

A phenomenon associated with oblique incidence.

Reflection

An occurrence based on acoustic impedance differences.

Angle Degree

Determines whether the incidence is normal or oblique.

Propagation Speed Assumption

The machine assumes that sound always travels at a speed of $1540\,m/s$.

Imaging Plane Assumption

The machine assumes the imaging plane is thin.

Beam Axis Assumption

The machine assumes that sound reflections originate only from structures located in the main axis of the beam.

Travel Path Assumption

The machine assumes sound travels directly to a reflector and back to the transducer.

Straight Line Assumption

The machine assumes that sound travels in a straight line.

Reflector Strength Assumption

The machine assumes reflector strength is proportional to the tissue properties which produce the reflection.