1. An area or zone that is the center of attention, activity, or interest; a central point of focus
The focal region of the image was highlighted in red.
A região focal da imagem foi destacada em vermelho.
2. In optics and physics, the region around the focal point where light rays converge or appear to diverge
The focal region of the lens determines the sharpness of the image.
A região focal da lente determina a nitidez da imagem.
3. In medical imaging, the area of primary clinical or diagnostic interest
The radiologist examined the focal region showing abnormal tissue.
O radiologista examinou a região focal que apresentava tecido anormal.