Final answer:
The projection produced when the sagittal plane of the body is parallel to the Imaging Receptor (IR) is known as a lateral projection.
Step-by-step explanation:
The term that describes a projection produced when the sagittal plane of the body or part is parallel to the Imaging Receptor (IR) is lateral. In radiologic terms, a lateral view is when the patient's side is placed against the imaging plate, and the sagittal plane runs perpendicular to the IR, effectively imaging right and left sides. A midsagittal plane divides the body exactly in the middle, creating two equal halves, whereas a parasagittal plane divides the body into unequal right and left sides. It is important to note that lateral views are useful for visualizing structures in the body from a side perspective.