X-ray or gamma ray systems or devices – Source support – Including object support or positioning
Patent
1997-03-24
1998-11-10
Wong, Don
X-ray or gamma ray systems or devices
Source support
Including object support or positioning
378208, A61B 505
Patent
active
058355561
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method and an apparatus on scannographs, in particular for computed tomographyradioscopy for interventions, and refers to adjustment of a table for the patient, fixing of its position, as well as triggering of a light-beam localiser and of a single scan after mechanical decoupling of the scannograph from the central control system.
DESCRIPTION OF THE BACKGROUND ART
Computed tomography has enriched medical diagnostics in an extraordinary manner and not only rendered numerous radiation-exposing X-ray examinations, such as encephalography or angiography, superfluous but also took advantage of the tomograms gained thereby for planning and checking the radiation therapy of tumors. Numerous pathological processes in the entire trunk of the body, such as carcinomata or enlarged lymph nodes, can be classified only by withdrawal of tissue and subsequently treated. Such biopsies can, inter alia, be carried out with the help of computed tomography. When doing so, the position of a needle introduced into the body is represented by executing a single sectional drawing in the plane of the needle.
After corresponding preparation of the patient, i.e. after positioning of said patient and disinfection of the skin of same as well as after having locally anaesthetised the point of puncturing, the biopsy needle is, usually outside the gantry, introduced so as to lie under the surface of the skin and, thereafter, the table with the patient will be moved into the gantry for conduction of the first check scan. Control of that procedure is effected from the console of the scannograph, which console, for reasons of radiation protection, is situated outside the examination room. When a lamination is radiographed, the medical personnel are not in the examination room. After the sectional drawing has been displayed on the monitor, the patient is moved out of the gantry. After a possibly required positional correction of the needle, another radiograph is taken once the table with the patient has been moved into the gantry through the console. The entire procedure--moving of the patient out of the gantry and into the gantry again--takes up a great deal of time and, during the whole examination, the patient must remain quiet and motionless.
Various solutions have been proposed, dealing with positioning of the patient resp of specific parts of the body or of tables for patients as exactly as possible, e. g.: facility, with the help of a sensor for determining the relative position of an object to be examined towards the radiographic facility, the determined data being compared with those of the relative position of a tomographic zone towards the radiographic facility (German Patent resp Laying-open Specification 38 08 009), scannograph can be linearly displaceably) guided by means of driving and guiding facilities day-bed can be moved into the housing of the scannograph, departing from an initial position--e.g. in case of examinations of the area of the cranium (European Patent 579 036), case--in order to avoid information losses between diagnosis and surgical treatment--the day-bed for the patient is, at the same time, constructed as an operating table (German Patent resp Laying-open Specification 42 02 302), temporomandibular joint (German Patent resp Laying-open Specification 39 37 077) or for scannographing the knee after fixation of the lower leg (German Patent resp Laying-open Specification 38 09 535), a monitor synchronously with the respective position of the measuring system towards the day-bed for the patient (German Patent 42 18 637, U.S. Pat. No. 5,373,543).
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is based on the object to develop a method and an apparatus by which, for computed tomography-radioscopy for interventions, exact positioning of the patient can be achieved and the number of scans for seeking the needle can be reduced.
This object was solved by combining a floating table for the patient with a sectional drawing modality for biopsies und
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Mutze Sven
Rogalla Patrik
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