**2. Diagnostic image quality (DIQ )**

It is a parameter linked to the ability to represent the normal and the pathological. For this purpose, it is necessary to identify variable "targets" depending on the different clinical use (e.g. representation of the thyroid and its pathology in the evaluation of the

equipment configured for the study of superficial organs; representation of superficial vessels and their pathology for the vascular study; representation of the gallbladder in the study of the upper abdomen, etc.). The DIQ is naturally linked to the next parameters.
