X-ray or gamma ray systems or devices – Source support – Including object support or positioning
Patent
1989-12-05
1991-06-11
Westin, Edward P.
X-ray or gamma ray systems or devices
Source support
Including object support or positioning
378177, 378181, 378197, 378 91, H05G 102
Patent
active
050238990
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for taking X-ray photographs or the like with the aid of a beam source which is carried for movement in X, Y and Z directions and which is rotatable about a horizontal axis, and also with the aid of a patient support table and a receptor unit which is positioned beneath the table and capable of being moved in the X and Y directions and which when displaced automatically instigates movement of the beam source.
By X-direction is meant here and in the following a direction of movement parallel with one long side of the patient support table, and by Y-direction is meant a direction of movement perpendicular to the extension of said one long side, i.e. movement parallel to the short side of the table. The patient support table may therewith be adjusted to mutually different positions in relation, for instance, to a tower column or ceiling-support tower which carries the beam source. In all instances the expression "X-direction" refers to movement parallel with the long side of the table.
The invention also relates to X-ray photography apparatus.
BACKGROUND PRIOR ART
U.S. Pat. No. 4,365,345 (Craig et al) describes apparatus of this kind, in which, however, the beam source is located beneath the table in the actual patient investigation part of the apparatus, and the image receptor is located on a tower structure arranged above said patient investigation part. When the beam source is moved in the X- and Y-directions these movements are transferred to the receptor over a servo system. In this case, the actual patient investigation part is expansive and space consuming and is found difficult to work with by the X-ray personnel. Another significant drawback with this known apparatus is that there is no possibility of taking side photographs with a horizontally directed beam path.
U.S. Pat. No. 4,024,403 (Bernstein et al) teaches a conventional tower structure with manual adjustment of the patient support table, an overlying beam source and a receptor located beneath the table. The apparatus includes an electrical auxiliary device for adjusting the beam source angle and synchronized movement of the receptor corresponding to said angular adjustment, such that the central beam will always impinge on the patient at the correct angle.
The work required from the X-ray personnel with this type of X-ray equipment is both laborious and complicated, placing great strain on the shoulders and back muscles of the personnel as a result of the manual adjustment movements which must be carried out, not least the displacement of the heavy beam source. This equipment also lacks a facility for taking side photographs with horizontal beam path.
U.S. Pat. No. 4,365,344 (Dornheim) provides an example of apparatus incorporating mechanical synchronization between the setting movements of the receptor and beam source. This arrangement utilizes a complicated lever system, which makes the work carried out by the X-ray personnel both heavy and complicated, primarily because of the large masses which need to be activated, and also because of the stretching and bending required of said personnel. Furthermore, the receptor part of the apparatus must be lifted up each time a side photograph is taken. The possibility of taking angled photographs is limited.
U.S. Pat. No. 3,492,482 (Forsyth) describes and illustrates a beam source which is mounted on a vertical tower structure and which is movable in the Z-direction, and a receptor part which is moved synchronously with the beam source on a corresponding vertical tower structure. The apparatus is intended exclusively for taking side photographs with horizontal beam path, and the apparatus consequently has a limited field of use.
GB-B-1,323,769 (Picket Corp) describes apparatus comprising a receptor part in a patient support table and an overlying ceiling-carried beam source. This apparatus affords the possibility of taking side photographs with horizontal beam path, by swinging-up the patient support table about a horizontal axis and pivo
REFERENCES:
patent: 4024401 (1977-05-01), Bernstein et al.
patent: 4358856 (1982-11-01), Stivender et al.
patent: 4365342 (1982-12-01), Vepy
patent: 4365344 (1982-12-01), Dornheim
patent: 4365345 (1982-12-01), Craig et al.
patent: 4412346 (1983-10-01), Takenouti et al.
patent: 4417356 (1983-11-01), Hoffman
patent: 4761805 (1988-08-01), Sebring
Chu Kim-Kwok
Westin Edward P.
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