X-ray or gamma ray systems or devices – Photographic detector support – For movable film or plate
Patent
1991-08-20
1992-10-20
Hannaher, Constantine
X-ray or gamma ray systems or devices
Photographic detector support
For movable film or plate
378182, 378167, 03B 4204, G03B 4204
Patent
active
051577070
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a method for carrying out X-ray examinations or like examinations with the aid of a cassette-carried receptor intended to receive radiation from a radiation source which is adapted to take two or more exposures.
The invention also relates to a cassette-holder device for carrying out such diagnostics.
Particular problems are encountered, both on the part of the patient and on the part of the personnel, when subjecting to X-ray examination elderly patients, who are often seriously handicapped, and other categories of patients who have difficulty in leaving their hospital bed on their own feet, e.g. because of serious illness or injury sustained in a traffic accident for instance. In some cases it is necessary to X-ray a patient at the beside with the patient in bed, requiring the image receptor to be placed between the patient and the mattress, with all the drawbacks associated therewith.
Bedside examinations are carried out both in intensive care wards, using portable X-ray equipment, and in the X-ray department itself.
The majority of patients who are either too ill or too weak to stand unsupported or unaided are, nevertheless, able to sit on the edge of the bed. Although some lung X-ray frames will permit frontal pictures to be taken from the bed, no room is available for side pictures, since the lung frame is normally placed adjacent a wall which makes it impossible to turn the bed through an angle of 90.degree..
BACKGROUND ART
Various methods and cassette holders have been proposed with the intention of facilitating the X-ray examination of handicapped patients.
For instance, U.S. Pat. No. 4,468,803 (Ronci) describes a cassette-holder suspension system which enables the cassette holder to be rotated in mutually different planes so as to enable different types of exposures to be taken. This known system include a clamping device which is maneuvered with the aid of knobs and by means of which the cassette holder and carrier means can be brought to different desired positions, for instance adjacent a table. Vertical adjustments can be made only by releasing the clamping device and mounting said device at the height desired. One drawback with this known apparatus is that it is heavy to manipulate, particularly when moving the apparatus between different positions of application.
U.S. Pat. No. 2,651,725 (McFarland) describes a similar cassette holder device which can be mounted in different positions adjacent a patient's bed. Adjustments require the manipulation or activation of a relatively large number of clamping or tightening members which--as a rule--are located at considerable distance from one another.
Other examples of the known art are found described in U.S. Pat. No. 3,795,815 (Weinstock et al.), which teaches a cassette holder fitted to a wheel chair and SE,B,354 728 (Tidestrom et al.) which teaches a freely transportable device for holding an X-ray film cassette in freely variable positions.
The majority of known arrangements and apparatus have the drawback that a cassette provided with receptor and mounted in a cassette holder can be centered in relation to the radiation source connected only with great difficulty. For instance, it is difficult to position the radiation source in relation to the image receptor so that radiation emitted from said source will pass at right angles to the receptor. Consequently, there is an obvious risk that the images taken will be unsatisfactory and need to be retaken, with subsequent exposure of the patient to unnecessary high dosages of radiation.
These difficulties are accentuated when a grid or screen is placed in the vicinity of the cassette holder--as is normally the case. An important prerequisite with respect to satisfactory images or photographs is that the screen extends perpendicularly to the radiation beam in one plane.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a method and an arrangement which will avoid the majority of the aforesaid drawbacks encountered with
REFERENCES:
patent: 2264410 (1941-12-01), Schier
patent: 2651725 (1953-09-01), McFarland
patent: 2939008 (1960-05-01), Goodfriend
patent: 3154683 (1964-10-01), Blair
patent: 3778625 (1973-12-01), Schwartz et al.
patent: 3795815 (1974-03-01), Weinstock et al.
patent: 4468803 (1984-08-01), Ronci
AO Medical Products AB
Hannaher Constantine
Wong Don
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