CN-115337034-B - Current modulation method and device for computed tomography tube and electronic device

CN115337034BCN 115337034 BCN115337034 BCN 115337034BCN-115337034-B

Abstract

The application relates to a computer tomography tube current modulation method, a device and an electronic device, wherein the computer tomography tube current modulation method comprises the steps of obtaining a first moving speed of a scanning bed and a first scanning tube current, wherein the first scanning tube current is a tube current applied by the scanning bed at the first moving speed, obtaining a second moving speed of the scanning bed, and generating a second scanning tube current according to the first moving speed, the second moving speed and the first scanning tube current, wherein the second scanning tube current is a tube current applied by the scanning bed at the second moving speed. According to the application, the computer equipment can modulate the first scanning tube current applied by the scanning bed at the first moving speed into the second scanning tube current applied by the scanning bed at the second moving speed, so that the problem of the scanning tube current modulation method of the computer tomography scanning in the state of lacking speed change in the related technology is solved.

Inventors

HE TAO
ZHOU JIAWEN

Assignees

上海联影医疗科技股份有限公司
上海联影医疗科技股份有限公司

Dates

Publication Date: 20260421
Application Date: 20220830
Priority Date: 20220830

Claims (8)

1. A method for modulating tube current of a computed tomography scanner, the method being used to modulate tube current applied by a scanner bed at different movement speeds; The method comprises the following steps: Acquiring a first moving speed of the scanning bed and a first scanning tube current, wherein the first scanning tube current is a tube current applied by the scanning bed at the first moving speed; acquiring a second moving speed of the scanning bed; generating a second scanning tube current according to the first moving speed, the second moving speed and the first scanning tube current, wherein the second scanning tube current is a tube current applied by the scanning bed at the second moving speed; The first scanning tube current is a first continuous tube current, the second scanning tube current is a second continuous tube current, the first moving speed is a constant first continuous speed, the first continuous speed is composed of a plurality of first instantaneous speeds, the plurality of first instantaneous speeds respectively correspond to different scanning positions, the second moving speed is a changed second continuous speed, the second continuous speed is composed of a plurality of second instantaneous speeds, the plurality of second instantaneous speeds respectively correspond to different scanning positions, and the scanning positions are the moving positions of the scanning bed, wherein each determined moving position of the scanning bed corresponds to a determined scanning position in the body of a patient; the second scanning tube current is determined by determining a current scanning position to be converted, determining a first instantaneous speed, a first instantaneous tube current and a second instantaneous speed corresponding to the current scanning position, adjusting the first instantaneous tube current according to the relation between the first instantaneous speed and the second instantaneous speed to obtain a second instantaneous tube current, and combining all the second instantaneous tube currents in sequence according to the scanning position to form a second continuous tube current.
2. The computed tomography tube current modulation method of claim 1, wherein the current magnitudes of the first and second persistent tube currents are related to a scan location; The speed magnitudes of the first and second continuous speeds are related to the scanning position.
3. The method of claim 1, wherein determining a second instantaneous tube current corresponding to the current scan position based on the first instantaneous speed, the first instantaneous tube current, and the second instantaneous speed comprises: determining a ratio relationship between the second instantaneous speed and the first instantaneous speed; and transforming the first instantaneous tube current through the ratio relation to obtain the second instantaneous tube current.
4. The method of claim 1, wherein generating a second scanner tube current from the first movement speed, the second movement speed, and the first scanner tube current comprises: determining a scanning range, and dividing the scanning range into a plurality of scanning intervals, wherein each scanning interval comprises at least one scanning position; Determining a current scanning interval from the scanning range; determining a first interval speed corresponding to the current scanning interval according to the current scanning interval and the first continuous speed; determining a first interval tube current corresponding to the current scanning interval according to the current scanning interval and the first continuous tube current; Determining a second interval speed corresponding to the current scanning interval according to the current scanning interval and the second continuous speed; determining a second interval tube current corresponding to the current scanning interval according to the first interval speed, the first interval tube current and the second interval speed; The second persistent tube current is generated based on the second interval tube current.
5. The method of claim 4, wherein determining a second interval tube current corresponding to the current scan interval based on the first interval velocity, the first interval tube current, and the second interval velocity comprises: Determining a first interval time according to the first interval speed, and determining an interval current product according to the first interval time and the first interval tube current; And determining a second interval time according to the second interval speed, and determining the second interval tube current according to the second interval time and the interval current product.
6. The method of computer tomography tube current modulation as claimed in any one of claims 1 to 5, wherein the method further comprises: acquiring a first scanning sequence, wherein the first scanning sequence comprises a first scanning tube current; a second scan sequence is generated based on the second scan tube current.
7. A computed tomography tube current modulation apparatus for modulating tube current applied by a scan bed at different movement speeds; the device comprises: A first acquisition module for acquiring a first movement speed of the scanner bed and a first scanner tube current, wherein the first scanner tube current is a tube current applied by the scanner bed at the first movement speed; the second acquisition module is used for acquiring a second moving speed of the scanning bed; A result generation module for generating a second scan tube current based on the first scan tube current according to the first and second movement speeds, wherein the second scan tube current is a tube current applied by the scan bed at the first movement speed; The first scanning tube current is a first continuous tube current, the second scanning tube current is a second continuous tube current, the first moving speed is a constant first continuous speed, the first continuous speed is composed of a plurality of first instantaneous speeds, the plurality of first instantaneous speeds respectively correspond to different scanning positions, the second moving speed is a changed second continuous speed, the second continuous speed is composed of a plurality of second instantaneous speeds, the plurality of second instantaneous speeds respectively correspond to different scanning positions, and the scanning positions are the moving positions of the scanning bed, wherein each determined moving position of the scanning bed corresponds to a determined scanning position in the body of a patient; the second scanning tube current is determined by determining a current scanning position to be converted, determining a first instantaneous speed, a first instantaneous tube current and a second instantaneous speed corresponding to the current scanning position, adjusting the first instantaneous tube current according to the relation between the first instantaneous speed and the second instantaneous speed to obtain a second instantaneous tube current, and combining all the second instantaneous tube currents in sequence according to the scanning position to form a second continuous tube current.
8. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the computer tomography tube current modulation method of any one of claims 1 to 6.

Description

Current modulation method and device for computed tomography tube and electronic device Technical Field The present application relates to the field of computed tomography, and in particular, to a method and an apparatus for modulating a computed tomography tube current, and an electronic apparatus. Background The computed tomography apparatus (Computed Tomography, CT for short) generally comprises a large part of an X-ray system, a control system, a data acquisition system, a data processing system, etc. Tomographic scanning and helical scanning are two typical CT application scenarios. During a scan, the patient typically lies on a movable CT table, and the corresponding site is scanned by moving the CT table. The development process of CT technology is also the process of continuously reducing the clinical scanning dose. Acquiring images satisfying clinical diagnosis at the lowest possible dose is an important direction and goal of CT technology development. The Dose Modulation (DOM) function plays an important role in reducing the Dose and improving the signal-to-noise ratio. Conventional CT clinical scanning usually starts paying off and collecting data after the speed of a scanning bed is constant, but in dynamic perfusion application, in order to obtain imaging data required by clinic, assist doctors in qualitative and quantitative analysis and evaluation of blood flow perfusion conditions of different tissues of a patient, the interval time of scanning needs to be controlled, so that paying off and data collection need to be performed in the acceleration and deceleration process of the scanning bed. However, the scanning tube current modulation method of the computer tomography in the variable speed state is still lacking. Variable speed scanning means that the scanning time of some of the scanning sub-areas is increased and the scanning time of some of the scanning sub-areas is reduced in the whole scanning area, compared to constant speed scanning. If the scanning tube current in the constant speed state is still adopted in the variable speed state, the scanning dosage of the scanning subarea with increased scanning time is also increased, and the scanning dosage of the scanning subarea with reduced scanning time is correspondingly reduced. Therefore, the defects that the scanning dosage of part of the subareas to be scanned is overlarge and the scanning dosage of part of the subareas to be scanned is overlarge exist in the variable speed scanning process. Aiming at the problem of the prior art that a scanning tube current modulation method of the computer tomography in a variable speed state is lacked, no effective solution is proposed at present. Disclosure of Invention In the present embodiment, a computed tomography tube current modulation method, a device, and an electronic device are provided to solve the problem of the related art that there is a lack of a computed tomography tube current modulation method in a variable speed state. In a first aspect, in this embodiment there is provided a method of computer tomography tube current modulation for modulating tube current applied by a scanning bed at different movement speeds; The method comprises the following steps: Acquiring a first moving speed of the scanning bed and a first scanning tube current, wherein the first scanning tube current is a tube current applied by the scanning bed at the first moving speed; acquiring a second moving speed of the scanning bed; generating a second scan tube current according to the first moving speed, the second moving speed and the first scan tube current, wherein the second scan tube current is a tube current applied by the scan bed at the second moving speed. In some of these embodiments, the first movement speed is a constant first continuous speed and the second movement speed is a varying second continuous speed; the first scanning tube current is a first continuous tube current, and the second scanning tube current is a second continuous tube current. In some of these embodiments, the current magnitudes of the first persistent tube current and the second persistent tube current are related to a scan position; The speed magnitudes of the first and second continuous speeds are related to the scanning position. In some of these embodiments, the generating a second scan tube current from the first movement speed, the second movement speed, and the first scan tube current comprises: determining a scanning range, the scanning range comprising at least one of the scanning positions; Determining a current scanning position from the scanning range; determining a first instantaneous speed corresponding to the current scanning position according to the current scanning position and the first continuous speed; Determining a first instantaneous tube current corresponding to the current scanning position according to the current scanning position and the first continuous tube current; determining a second instan