A method and device for controlling pulse stacking
A technology for controlling pulses and projections, which is applied in measuring devices, radiation measurements, and instruments for radiological diagnosis. It can solve problems such as the inability to dynamically control pulse stacking, and achieve the effect of optimizing imaging quality.
Active Publication Date: 2020-07-31
NEUSOFT MEDICAL SYST CO LTD
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[0006] In view of this, the embodiment of the present application provides a method and device for controlling the pulse stacking of photon counting detectors, so as to solve the technical problem that the pulse stacking cannot be dynamically controlled in the prior art
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[0061] In order to make the above objects, features and advantages of the present application more obvious and understandable, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0062] In order to facilitate the understanding of the technical solutions provided by the embodiments of the present application, the background technology of the present application is described first.
[0063] The inventor found through the research on the traditional pulse stacking control method that the traditional control of the pulse stacking mainly adopts the following three methods: one is to reduce the tube voltage and tube current as a whole. Specifically, by appropriately reducing the exposure voltage and current, the photon count rate is suppressed at the ray emitting end, thereby reducing the number of photons finally incident on the pixel unit of the detector per unit ti...
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The embodiment of the present application discloses a method and a device for controlling pulse stacking. Specifically, the scanner parameters are first obtained, and the scanner parameters may include exposure voltage used for scanning, exposure time for each scan, and projection for each scan. quantity. And calculate the radiation source angle corresponding to each projection according to the number of projections per scan in the scanner parameters and the initial position of the radiation source, and then take the minimization of the output value of the objective function as the goal, calculate the maximum corresponding to each projection at the exposure voltage The optimal exposure current can be obtained to obtain the optimal exposure current corresponding to each projection in each scan. During the actual scanning, the current projection can be determined in real time according to the exposure time of each scan and the current exposure time, and then the optimal exposure current corresponding to the current projection can be used to scan to control the photon count rate incident on the pixel unit. Furthermore, the pulse stacking of the photon counting detector is controlled within a certain range during each projection to optimize the imaging quality.
Description
technical field [0001] The present application relates to the technical field of CT (Computed Tomography, computerized tomography), in particular to a method and device for controlling pulse stacking. Background technique [0002] A CT scanner generally includes major components such as a radiation source (such as a tube) and a detector. The radiation (such as X-ray) emitted by the radioactive source is attenuated by the object, and then it is received by the detector and converted into a signal that can be recognized by the computer for image reconstruction. In practical applications, the detector can be a photon counting detector, which can directly convert single photon energy information into a pulse signal, the pulse height corresponds to the energy of the radiation photon, and the pulse number corresponds to the number of photons. [0003] Photon counting detectors have the advantage of energy resolution, but there are still shortcomings in practical applications. Si...
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IPC IPC(8): G01T1/161A61B6/03
CPCA61B6/032G01T1/161A61B6/4241A61B6/542A61B6/544A61B6/545G01T1/171A61B6/488
Inventor 楼珊珊
Owner NEUSOFT MEDICAL SYST CO LTD