Radiograph of a patient swallowing water with a soluble radiopaque substance mixed into it, c.1971.
Radiograph of a patient swallowing water with a soluble radiopaque substance mixed into it, c.1971. Source: Jean-Pierre Melki, Avantages des opicifiants hydrosolubles dans l'examen radiologique du tractus oeso-gastro-intestinal. Faculté de Médecine Xavier-Bichat, Paris: 1971. -- source link
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