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| French | English |
| foyer fin | fine focus (of an X-ray tube) |
| foyer très fin | ultrafine focus (of an X-ray tube) |
| foyer ultra-fin | ultrafine focus (of an X-ray tube) |
| foyer électronique | actual focal spot (of an X-ray tube) |
| petit foyer | fine focus (of an X-ray tube) |
| profondeur du foyer | tumour depth |
| tube radiogène à double foyer | double focus X-ray tube |
| tube radiogène à foyer fin | fine focus X-ray tube |
| tube radiogène à foyer linéaire | line focus tube |
| tube radiogène à foyer ultra-fin | ultrafine focus tube (Xray tube) |
| tube radiogène à petit foyer | fine focus X-ray tube |
| tube à double foyer | bifocal X-ray tube |
| tube à double foyer | double focus X-ray tube |
| valeur nominale du foyer | nominal focal spot value (of an X-ray tube) |