Field of view in general corresponds to the area observed or measured out of the possible observable area in the physical world. A field of view will therefore be specified in spatial measurements e.g. millimeters.
In radiology, the acquisition or scanning field of view comes closest to this concept, and when the term is used without specification, it is usually to refer to this type of field of view.
Clinical applications
In CT or MRI, this concept is usually applied to axial slice planes, but in 3D ultrasound, the concept is used more generally 1.
The reconstruction and/or display field of view in tomography refers to the reconstructed area as opposed to the entire area in the raw dataset, although these two areas can and often are set to the same area.
The concept of a 'useful field of view' refers to the area in images in which a radiologist will easily see information without much effort 2.
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