Final answer:
Beam restriction does improve contrast resolution and reduces patient dose, but it does not improve spatial resolution. Spatial resolution is influenced by other factors such as pixel size and imaging geometry.
Step-by-step explanation:
The question pertains to beam restriction and its effects on image quality and patient dose in radiographic imaging. All listed statements about beam restriction are true except for 'Beam restriction improves spatial resolution.'
Beam restriction does indeed improve contrast resolution by minimizing scatter radiation, and a reduced field size that does not exceed the dimensions of the image receptor (IR) ensures that only the area of interest is irradiated, which inherently reduces the patient dose. However, spatial resolution, which is the ability to distinguish between two closely spaced objects, is not directly affected by beam restriction. It is instead determined by factors such as the imaging system's pixel size, the geometry of the imaging setup, and motion blur.
It is important to remember that restriction tools, like collimators, define the x-ray beam and make it smaller or larger according to the area being imaged, which does not enhance the fine detail seen in the image, but rather impacts the image contrast and amount of radiation used.