CT inspection system and CT imaging method for obtaining detection data at a frequency that is N times a beam-emitting frequency of a radioactive source device
The present disclosure relates to the technical field of CT detection, and in particular to a CT inspection system and a CT imaging method. The CT inspection system provided by the present disclosure comprises a radioactive source device, a detection device, a rotation monitoring device and an imaging device, wherein the detection device obtains detection data at a frequency that is N times a beam emitting frequency of the radioactive source device; the rotation monitoring device detects a rotation angle of the detection device and transmits a signal to the imaging device each time the detection device rotates by a preset angle; the imaging device determines a rotational position of the detection device each time the radioactive source device emits a beam according to the signal transmitted by the rotation monitoring device and the detection data of the detection device.
1. A CT imaging method, comprising the steps as follows:
scanning an object to be inspected by a radioactive source device and a detection device of a scanning device,
wherein the radioactive source device and the detection device synchronously rotate at a non-uniform speed in at least a partial scanning process, and the detection device obtains detection data at a frequency that is N times a beam emitting frequency of the radioactive source device, wherein N is greater than or equal to 2;
detecting a rotation angle of the detection device by a rotation monitoring device, and transmitting a signal to an imaging device each time the detection device rotates by a preset angle by the rotation monitoring device; and
determining a rotational position of the detection device by the imaging device each time the radioactive source device emits a beam according to the signal transmitted by the rotation monitoring device and the detection data of the detection device, and generating a CT image by the imaging device based on the detection data and the rotational position of the detection device each time the radioactive source device emits a beam.
2. The CT imaging method according to claim 1 , wherein determining a rotational position of the detection device by the imaging device each time the radioactive source device emits a beam according to the signal transmitted by the rotation monitoring device and the detection data of the detection device comprises:
determining the rotational position of the detection device by the imaging device each time the radioactive source device emits a beam based on the signal transmitted by the rotation monitoring device, the detection data of the detection device, and beam emitting information of the radioactive source device.
3. The CT imaging method according to claim 1 , wherein determining a rotational position of the detection device by the imaging device each time the radioactive source device emits a beam according to the signal transmitted by the rotation monitoring device and the detection data of the detection device, and generating a CT image by the imaging device based on the detection data and the rotational position of the detection device each time the radioactive source device emits a beam comprises:
receiving the signal transmitted by the rotation monitoring device and the detection data of the detection device by an information processing device of the imaging device;
determining a rotational position of the detection device by the information processing device each time the radioactive source device emits a beam based on the signal transmitted by the rotation monitoring device and the detection data of the detection device; and
generating a CT image by an image processing device of the imaging device based on the detection data and the rotational position of the detection device each time the radioactive source device emits a beam.
4. The CT imaging method according to claim 3 , further comprising:
obtaining beam emitting information of the radioactive source device by the information processing device;
wherein determining a rotational position of the detection device by the information processing device each time the radioactive source device emits a beam based on the signal transmitted by the rotation monitoring device and the detection data of the detection device comprises:
determining the rotational position of the detection device by the information processing device each time the radioactive source device emits a beam based on the signal transmitted by the rotation monitoring device, the detection data of the detection device, and the beam emitting information of the radioactive source device.
5. The CT imaging method according to claim 1 , wherein determining a rotational position of the detection device by the imaging device each time the radioactive source device emits a beam according to the signal transmitted by the rotation monitoring device and the detection data of the detection device comprises:
determining the rotational position of the detection device by the imaging device each time the radioactive source device emits a beam according to the detection data of the detection device between every two adjacent signals transmitted by the rotation monitoring device.
6. The CT imaging method according to claim 1 , further comprising:
multiplying the beam emitting frequency of the radioactive source device by N times by a frequency multiplying device; and
obtaining the detection data by the detection device based on a frequency multiplied by the frequency multiplying device, so that obtaining the detection data by the detection device at a frequency that is N times the beam emitting frequency of the radioactive source device.
7. The CT imaging method according to claim 1 , wherein detecting a rotation angle of the detection device by a rotation monitoring device, and transmitting a signal to an imaging device each time the detection device rotates by a preset angle by the rotation monitoring device comprises:
detecting a rotation angle of the detection device in a scanning process by a position detecting device of the rotation monitoring device; and
transmitting a signal by the rotation monitoring device to the imaging device each time the detection device rotates by the preset angle according to a detection result of the position detecting device.
8. The CT imaging method according to claim 7 , wherein transmitting a signal by the rotation monitoring device to the imaging device each time the detection device rotates by the preset angle according to a detection result of the position detecting device comprises:
transmitting a signal by a rotation control device of the rotation monitoring device to the imaging device each time the detection device rotates by the preset angle according to the detection result of the position detecting device.
9. The CT imaging method according to claim 8 , further comprising:
controlling at least one of rotational speeds of the radioactive source device and the detection device, and beam emitting of the radioactive source device by the rotation control device.