Stationary real time CT imaging system and method thereof
The present invention discloses a stationary real-time CT imaging system, comprising an annular photon counting detector, an annular scanning x-ray source, and a scanning sequence controller. Under the control of the scanning sequence controller, the annular scanning x-ray source emits x-ray, and the x-ray penetrates the object being tested and projects onto the corresponding annular photon counting detector. The annular photon counting detector delivers the corresponding exposure information through the main scanning machine and the main controlling unit to a CT main machine and a human-machine interface unit. The image reconstruction is completed in the CT main machine and the human-machine interface unit. By electronically controlling and switching x-ray projection positions in order, the scanning speed is enhanced by tens of times, thereby obtaining dynamic 3D images. The use of the photon counting detector enables the access to absorption data and energy data, thereby allows for real-time data reconstruction.
1. A stationary real-time CT imaging system, including a bed control unit, a CT host and interface unit, a power control unit, a main processor, and a scan host, wherein:
the scan host includes an annular scanning x-ray source and an annular photon-counting detector, said annular scanning x-ray source and said annular photon counting detector being in different planes parallel to each other;
the annular scanning x-ray source includes a plurality of scanning x-ray sources closely arrayed in a ring, and the annular photon-counting detector includes a plurality of photon-counting detector modules closely arrayed in a ring;
the scanning x-ray source is configured to sequentially emit pencil beam x-rays to corresponding photon counting detector module, the x-rays penetrating through an object, wherein the photon counting detector modules send corresponding exposure information, via the scan host and the main processor, to the CT host and interface unit, and the CT host and interface unit completes reconstruction and visual reproduction of an image in real time,
wherein the pencil beam x-ray exposes on an area at each moment while only pixels of the photon counting detector in the area are ready to acquire the exposure information and pixels of the photon counting detectors not in the area do not work.
2. The stationary real-time CT imaging system according to claim 1 wherein the main processor has a scan timing controller, which controls a plurality of scanning x-ray sources that locate in different areas to work simultaneously or sequentially.
3. The stationary real-time CT imaging system according to claim 1 wherein each photon-counting detector module includes an independent data acquisition module and a data transmission channel for data transmission in GHz or THz frequencies.
4. The stationary real-time CT imaging system according to claim 1 wherein:
the scan host further includes a photon-counting detector controller, a multi-channel photon-counting detector acquisition circuit, multi-channel data transmission channels and a data preprocessor;
each photon-counting detector module is configured to complete initial integration of acquired data and to send the integrated data to the multi-channel photon-counting detector acquisition circuit, wherein the multi-channel data transmission channels are configured to receive the data from the multi-channel photon-counting detector acquisition circuit and then send the received data to the data preprocessor.
5. The stationary real-time CT imaging system according to claim 1 wherein:
the CT host and interface unit includes a real time reconstruction system and main control computer that connects with a multi-mode scan timing generator in the main processor;
the multi-mode scan timing generator connects with a scan timing controller and the photon-counting detector controller.
6. The stationary real-time CT imaging system according to claim 4 wherein:
the data preprocessor is configured to process the data from the multi-channel data transmission channels, into data frames, and then transmit the data frames to the high speed data transmission channel and
the real-time reconstruction systems and main control computer.
7. A stationary real-time CT imaging system, including a bed control unit, a CT host and interface unit, a power control unit, a main processor, and a scan host, wherein:
the scan host includes a multi-focus annular scanning x-ray sources and an annular photon-counting detector;
the multi-focus annular x-ray sources includes a plurality of scanning x-ray sources closely arrayed in a ring, and the annular photon-counting detector includes a plurality of photon-counting detector modules closely arrayed in a ring;
each scanning x-ray source sequentially emits fan beam ray x-rays directing to a corresponding photon counting detector module, the x-rays having penetrated through an object, the photon counting detector modules work in overlap mode and send corresponding exposure information, via the scan host and the main processor, to the CT host and interface unit, the CT host and interface unit completes reconstruction and visual reproduction of an image in real time,
wherein the pencil beam x-ray exposes on an area at each moment while only pixels of the photon counting detector in the area are ready to acquire the exposure information and pixels of the photon counting detectors not in the area do not work.
8. The stationary real-time CT imaging system according to claim 7 wherein:
the multi-focus annular x-ray source is configured to evenly rotates an angle which is acquired by dividing 360° by a number of the focuses of the multi-focus annular x-ray source, and to emit the pencil beam x-rays in several times during the period that the multi-focus annular x-ray sources rotates by the angle.
9. The stationary real-time CT imaging system according to claim 7 wherein
the scanning x-ray sources of the multi-focus annular x-ray source are configured to completes energy spectrum scans by means of energy instantaneous switching in turns, until all the scanning x-ray sources complete the energy spectrum scans,
wherein, in the energy spectrum scan, single scan x-ray source instantaneously switches multiple energy levels.
10. The stationary real-time CT imaging system according to claim 7 wherein:
all the scanning x-ray sources of the multi-focus annular x-ray source simultaneously complete a circumferential scan under the control of the scan timing controller with the same energy level, then complete another circumferential scan with another energy level.
11. The stationary real-time CT imaging system according to claim 10 wherein:
the scanning x-ray sources distributed along a circumference of the annual x-ray source are divided into several groups, the scanning x-ray sources in a same group using an identical energy level and each group's energy level being different from that of other groups.