CT (computed tomography) apparatus and displacement compensation method and system thereof
A technology of displacement compensation and displacement, applied in the medical field, can solve problems such as scanning errors, affecting the scanning process, and wrong scanning results, and achieve the effect of increasing applicability and expanding the acquisition angle of view
Active Publication Date: 2015-04-29
SIEMENS SHANGHAI MEDICAL EQUIP LTD
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[0003] Among them, if the patient moves the body before the start of each scan, that is, the position of the patient changes, and the operator does not know this change, the operator will scan according to the initially determined scan range, and at this time an error will be obtained. scan results, sometimes may need to repeat the scout scan and follow-up tomography scan
And if the operator finds the displacement of the patient's body, it needs to be manually compensated. In one case, the doctor may adjust the scanning range by himself based on experience, which will inevitably have a certain scanning error. In another case, the doctor cannot Estimates the exact extent of movement for which re-scanning and subsequent tomography are required
Also, even if a positioning scan is retaken, there is no guarantee that the patient's body will not move until the next stage of the scan
[0004] It can be seen that in the prior art, once the patient's body moves between two scans, it will not only affect the normal scanning process, waste time, but also increase a lot of unnecessary radiation dose to the patient
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[0049] In the present invention, in order to avoid the above-mentioned adverse effects caused when the patient's body is displaced, it is considered to automatically monitor the patient's body displacement, and the automatic monitoring is realized based on the images collected by the optical camera. When the monitored displacement reaches the set When the threshold is set, which may affect the scanning result, the displacement compensation is performed on the scanning range. Further, displacement compensation can also be performed on the reconstructed field of view (FOV, Field of View). Compensation of patient displacements can thus be achieved without additional radiation doses.
[0050] In order to make the purpose, technical solution and advantages of the present invention clearer, the following examples are given to further describe the present invention in detail.
[0051] figure 2 It is a schematic flowchart of a compensation method for patient displacement in a CT ma...
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The invention discloses a CT (computed tomography) apparatus, compensation system and method for displacement of a patient in the CT apparatus, a computer program and a readable recording medium. The system comprises a camera, a first image processing unit, a second image processing unit, a displacement compensation unit and a storage unit, wherein the camera is used for acquiring a current image of a patient, the first image processing unit is used for determining a current profile of a target organ according to the image, the second image processing unit is used for determining a current rectangular area representing the current profile of the target organ, the displacement compensation unit is used for calculating displacement of the current rectangular area relative to a previous rectangular area and compensating the displacement, and the storage unit is used for maintaining the current rectangular area as the previous rectangular area. By the displacement compensation method and system, the displacement of the patient can be compensated without extra radiation dosage.
Description
technical field [0001] The invention relates to the field of medicine, in particular to a compensation method and system for patient displacement in a computed tomography (CT) machine and a CT machine. Background technique [0002] Such as figure 1 As shown, when using a CT machine to scan and image the human body, the patient 101 needs to be placed on the bed board 1021 of the patient examination table 102, and the patient 101 is horizontally placed and sent into the scanning area of the CT gantry 103 by moving the bed board 1021 before scanning can be performed. Inspection, when performing scanning inspection, usually includes two stages of scanning. The first stage is positioning scanning (toposcan), that is, the stage of determining the scanning range, which is used to determine the starting position, end position and rack of the scanning ( gantry) tilt angle. The second stage is tomoscan, the real scanning imaging stage. In addition, after the second-stage scan, it...
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IPC IPC(8): A61B6/03
Inventor 王雨晨姜涛吴韬炯陈马昊
Owner SIEMENS SHANGHAI MEDICAL EQUIP LTD