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Energy spectrum ct imaging method and energy spectrum ct imaging system

A technology of CT imaging and energy spectrum, which is applied in medical science, diagnosis, computerized tomography scanners, etc., can solve the problems of reducing image quality, achieve the effects of reducing radiation dose, improving image clarity, and improving CT image quality

Active Publication Date: 2020-09-15
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Synchronization signal generation in the existing X-ray pulse radiation mode uses synchronization based on frame frequency (referring to the number of frames or images projected or displayed per second). This synchronization method is a synchronization method based on time. The number of images collected per second, using the frame rate to carry out synchronous data collection at each time point, and the reconstruction of the image is based on the angle of the collected data rather than the time point, which requires that the rotation accuracy of the motion platform must be high. Otherwise the mismatch of acquisition time and acquisition location will degrade the quality of the reconstructed image

Method used

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  • Energy spectrum ct imaging method and energy spectrum ct imaging system

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Embodiment 1

[0027] see figure 1 In this embodiment, a spectral CT imaging system is provided, and the spectral CT imaging system includes an X-ray emission device, an X-ray detection device, a motion platform, a motor, an encoder, a motion control card, and a PC.

[0028]Specifically, the motion platform is used to carry the object to be measured, the motor is connected with the motion platform to drive its rotation, the encoder is installed on the motor, the encoder also rotates a circle when the motor rotates, the motion control card is connected with the encoder and the PC connect.

[0029] Further, the encoder can send a pulse signal along with the rotation of the motor, and the motion control card can receive the pulse signal and transmit it to the PC, and the PC counts the number of received pulse signals, and the PC can Send a start pulse signal to the motion control card after a set number of pulse signals, and the motion control card can simultaneously drive the X-ray emitting d...

Embodiment 2

[0050] In this embodiment, the difference from Embodiment 1 lies in the calculation formula of the preset quantity and the function of the input terminal of the PC.

[0051] Specifically, in this embodiment, the formula for calculating the preset quantity is:

[0052] x=θ×i×[(a×b) / 360];

[0053] Among them, x is the preset number, θ is the shooting rotation angle of the moving platform, i is the transmission ratio of the motor and the moving platform, a is the line number of the encoder, b is the frequency multiplication of the encoder, and 360 is the degree.

[0054] The following example calculation process:

[0055] First, there are four parameters (θ, i, a, b) in the calculation formula of the preset quantity. According to the selected encoder model, determine that the number of lines of the encoder is 2500, and the frequency multiplication of the encoder is 4 times; it is necessary to shoot once every time the motion platform rotates 1°, therefore, θ=1; the transmission...

Embodiment 3

[0061] In this embodiment, a spectral CT imaging method is provided, which can be realized by using the spectral CT imaging system of Embodiment 1 or Embodiment 2.

[0062] Specifically, the spectral CT imaging method of this embodiment includes the following steps:

[0063] The motor drives the motion platform used to carry the object to be measured to rotate, and the encoder installed on the motor sends out pulse signals with the rotation of the motor;

[0064] After receiving the pulse signal, the motion control card transmits it to the PC;

[0065] Every time the PC receives a preset number of pulse signals, it sends a start pulse signal to the motion control card;

[0066]After receiving the start pulse signal, the motion control card simultaneously drives the X-ray emitting device and the X-ray detection device to start.

[0067] On the one hand, the pulse signal of the encoder is issued based on its own rotation, that is, indirectly based on the rotation of the motor,...

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Abstract

The present invention relates to the field of CT imaging technology, and in particular to an energy spectrum CT imaging method and an energy spectrum CT imaging system. The energy spectrum CT imaging system includes X-ray emission equipment, X-ray detection equipment, a motion platform for carrying the object to be measured, a motor connected to the motion platform to drive its rotation, an encoder, a motion control card and a PC. In the energy spectrum CT imaging method, the motor drives the motion platform used to carry the object to be measured to rotate. At the same time, the encoder installed on the motor emits a pulse signal as the motor rotates; the motion control card receives the pulse signal and transmits it to the PC. ; Each time the PC receives a preset number of pulse signals, it sends a start pulse signal to the motion control card; after the motion control card receives the start pulse signal, it drives the X-ray emission equipment and the X-ray detection equipment to start at the same time. The above-mentioned energy spectrum CT imaging systems and methods can improve CT image quality while reducing radiation dose.

Description

technical field [0001] The invention relates to the technical field of CT imaging, in particular to an energy spectrum CT imaging method and an energy spectrum CT imaging system. Background technique [0002] When doctors examine patients, they may encounter lesions that are difficult to observe directly in the human body, or need to judge the state of lesions more intuitively. At this time, they need the assistance of medical equipment, among which CT is a very Common and effective means, and doing a CT scan has been accepted by most patients. However, CT imaging technology has problems such as unclear images, which makes it more challenging for doctors to accurately judge the condition, and radiation problems will make patients worry and even resist when scanning. [0003] In the past, CT imaging technology only considered X-rays as a single energy, and it was difficult to overcome problems such as radiation hardening, high dose, low contrast, and inability to identify ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03A61B6/00
CPCA61B6/032A61B6/035A61B6/4411A61B6/5205A61B6/542
Inventor 孝大宇刘栋郭洋杨超然滕月阳李建华康雁
Owner NORTHEASTERN UNIV LIAONING