Device for positioning a patient during acquisition of volumetric CBCT radiographs

A radiographic apparatus comprising a gantry and a table for supporting a patient, the table comprising a device configured to immobilize a head of the patient lying on the table,

• wherein the device configured to immobilize a head of the patient comprises:
• a dome configured to support the head of the patient therein;
• a basal plate;
• at least one junction provided at a first end of the basal plate;
• two uprights provided at a second end of the basal plate opposed to the first end, two slits being defined in the two uprights, a slide being disposed within each slit;
• and
• a cursor sliding in the two slits and configured to be blocked in position by a bushing, and
• wherein the basal plate, the at least one junction, the two uprights, the cursor, and the bushing are all radio-transparent and non-metallic.