Table 2. Estimated percentages of the proportion of tissue irradiated based on the volume of that tissue in the image field.

	30 cm FOV	23 cm FOV	15 cm FOV, parotid	15 cm FOV, submandibular	Plain radiography, parotid	Plain radiography, submandibular
Thyroid	100	80	20	100	100	100
Oesophagus	10	5	2.5	10	10	10
Bone surface	16.5	11	8.25	4.5	11	4.5
Bone marrow	16.5	11	8.25	4.5	11	4.5
Salivary gland	100	100	100	100	100	100
Skin	5	3	2.5	2.5	3	2.5
Brain	100	50	10	5	50	10
Remainder	20	15	10	10	15	10