| 摘要 |
The apparatus (10) for orthoradial panoramic tomography comprises a radiation source (111) for motion relative to a point of reference (Pb); a cassette means (112) also for motion relative to the point of reference; a support (11) for holding the radiation source (111) and the cassette (112) relative to the point of reference; a head positioning means (16, 25) including a first or intraoral device (25) and a second or extraoral device (16) for positioning the patient's head relative to the point of reference; a carriage (12) connected with the support (11) and including a grip (121); a substantally vertical column (14) for slidingly holding the carriage (12) in a vertically defined position and having a vertical axis (A<1>) distanced from the point of reference; the apparatus further comprises a foot positioning means (17) having a substantially horizontal reference face (170) for defining a vertical distance from the horizontal reference face to the point of reference (Pb) and a substantially vertical reference face (171/172) for maintaining toe and/or heel portions of the patient's feet in a predetermined position; a distancing means (18) is provided for maintaining the at least one vertical reference face (171/172) at a reproducible horizontal distance from the vertical axis (A min ) of the column (14); and a means (19) is arranged for determining and reproducibly setting a vertical distance between the horizontal reference |
