Final answer:
Diagnostic efficacy in medical imaging is achieved through the use of optimal-quality images to reveal the presence or absence of disease. Different medical imaging techniques, such as X-rays, MRI, CT scans, PET scans, and ultrasound, are used depending on the specific requirements of the case.
Step-by-step explanation:
When an imaging procedure is justified in terms of medical necessity, diagnostic efficacy is achieved when optimal-quality images are obtained. These images reveal the presence or absence of disease and are obtained using various medical imaging techniques.
For example, X-rays are often used to view fractures and dental issues. Magnetic resonance imaging (MRI) uses radio waves to produce highly detailed two- and three-dimensional images. Other techniques, such as CT scans, PET scans, and ultrasound, each have their own advantages and uses in medical imaging.