Anatomical modalities provide insight into the anatomical morphology. They
include radiography, ultrasonography or ultrasound (US, Section 3.2.1), computed
tomography (CT, Section 3.2.2), magnetic resonance imagery (MRI, Section 3.2.3)
There are several derived modalities that sometimes appear under a different name,
such as magnetic resonance angiography (MRA, from MRI), digital subtraction an-
giography (DSA, from X-rays), computed tomography angiography (CTA, from CT)
etc.