CN114027863B - Intelligent PET/CT linkage scanning system - Google Patents
Intelligent PET/CT linkage scanning system Download PDFInfo
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- CN114027863B CN114027863B CN202111363527.7A CN202111363527A CN114027863B CN 114027863 B CN114027863 B CN 114027863B CN 202111363527 A CN202111363527 A CN 202111363527A CN 114027863 B CN114027863 B CN 114027863B
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Abstract
The invention relates to an intelligent PET/CT linkage scanning system, comprising: a PET scanning module to scan a target region and generate a first PET image; when the PET scanning unit scans a target area, the statistical unit counts the actual coincidence event growth speed of the coincidence event and compares the actual coincidence event growth speed with a preset value; the CT scanning module is connected with the PET scanning module and used for scanning a target area and generating a first CT image; the image reconstruction module is respectively connected with the PET scanning module and the CT scanning module and used for reconstructing the first PET image and the first CT image and generating a PET-CT image; the storage module is respectively connected with the PET scanning module, the CT scanning module and the image reconstruction module and is used for storing data; the invention can monitor the scanning process in real time, and prolong the service life of the system while ensuring the quality of the generated first PET image.
Description
Technical Field
The invention relates to the technical field of medical scanning, in particular to an intelligent PET/CT linkage scanning system.
Background
A PET (Positron Emission Tomography) device is a medical imaging device for detecting metabolic conditions of tissues in the human body. The medicine marked by the radioactive nuclide enters the human body in an intravenous injection mode and participates in the metabolism of human tissues. At the same time, the radionuclide decays, and the positron produced by the decay annihilates with a nearby negative electron, producing a pair of gamma photons of 511KeV in energy. The pair of gamma photons travel back to back at the speed of light in an approximately 180 deg. direction.
Computed Tomography (CT) is an imaging method using different attenuation degrees of each part of the structure of the object to be measured to X-rays, and the specific process is as follows: the X-ray source and the CT detector are oppositely arranged and rotate around a measured object, the CT detector collects X-rays penetrating through the object, and the attenuation coefficient of each part is calculated according to the intensity of the X-rays. CT imaging has a higher resolution than PET imaging and can provide structural information.
The PET detectors are typically organized in a regular polygonal cylinder approximating a circular cylinder, and the emission directions of the above-mentioned gamma photon pairs are isotropic, so that if the PET detectors are in the field of view (i.e., the circular cylinder), then with a certain probability, both photons of the gamma photon pair will hit a respective PET detector. After the PET detector is struck, photons are emitted within the detector. The photoelectric conversion device records the energy and time of the optical signal. This record is referred to as a single event.
The PET system has a preset energy window and time window, if the energy value and time difference of two single events fall into the energy window and time window, the pair of gamma photons will be recorded as a coincidence event, and the Line between two hit crystals is called LoR (Line of Response), that is, the spatial information of the coincidence event.
In the prior art, in the scanning process of a PET detector, the scanning process cannot be controlled, so that the number of coincidence events is insufficient, and the quality of a PET image is low.
Disclosure of Invention
Therefore, the invention provides a PET/CT linkage scanning system which is used for solving the problems that the number of coincidence events is insufficient and the quality of PET images is low because the scanning process cannot be controlled in the prior art.
In order to achieve the above object, the present invention provides an intelligent PET/CT linked scanning system, comprising:
a PET scanning module to scan a target region and generate a first PET image; the PET scanning module comprises a PET scanning unit used for scanning a target area, a PET position unit used for determining the target area, a statistical unit used for counting the number of coincidence events, an adjusting unit used for adjusting the moving speed of the scanning unit and a PET image generating unit used for generating a PET image; when the PET scanning unit scans the target area, the statistical unit counts the actual coincidence event growth speed in the coincidence event and compares the actual coincidence event growth speed with a preset value, the statistical unit judges that the actual coincidence event growth speed is greater than the preset value, the adjusting unit increases the moving speed of the PET scanning unit and marks the decrease of the injection amount of the radioactive substance by the statistical unit so as to enable the actual coincidence event growth speed to accord with the standard, the statistical unit judges that the actual coincidence event growth speed is less than the preset value, the adjusting unit decreases the moving speed of the PET scanning unit and marks the increase of the injection amount of the radioactive substance by the statistical unit so as to enable the actual coincidence event growth speed to accord with the standard.
The CT scanning module is connected with the PET scanning module and used for scanning a target region and generating a first CT image; the CT scanning module comprises a CT scanning unit used for scanning a target area, a CT position unit used for determining the target area and a CT image generating unit used for generating a CT image;
the image reconstruction module is respectively connected with the PET scanning module and the CT scanning module and used for reconstructing the first PET image and the first CT image and generating a PET-CT image when reconstruction is finished;
the storage module is respectively connected with the PET scanning module, the CT scanning module and the image reconstruction module and used for storing data; wherein, the storage module is also stored with the user radioactive substance injection amount.
Further, when the PET scanning unit scans the target area, the counting unit counts the number of coincidence events in unit time in real time to calculate an actual coincidence event growth speed V of the coincidence events, compares the actual coincidence event growth speed V with a preset coincidence event growth speed V0, and determines whether the first PET image quality meets the standard according to the comparison result;
the preset coincidence event growth rate V0 includes a first preset coincidence event growth rate V1 and a second preset coincidence event growth rate V2, wherein V1 < V2;
when V is less than V1, the statistical unit judges that the actual event growth rate is not in accordance with the standard, the first PET image quality is not in accordance with the standard, and the moving speed of the PET scanning unit needs to be adjusted;
when V1 is not less than V2, the statistical unit judges that the actual event growth rate is in accordance with the standard and the first PET image quality is in accordance with the standard;
when V > V2, the statistical unit determines that the actual coincidence event growth rate does not meet the criteria, and the first PET image quality does not meet the criteria, and the moving speed of the PET scanning unit needs to be adjusted.
Further, when the statistical unit judges and needs to adjust the moving speed of the PET scanning unit and V is less than V1, the statistical unit calculates an actual coincidence event growth speed difference value delta V, compares the actual coincidence event growth speed difference value delta V with a preset coincidence event growth speed difference value maximum value delta Vmax, selects an adjusting mode according to a comparison result, and sets the adjustment mode to be V1-V;
when Δ V > Δvmax, the statistical unit determines that the actual coincidence event growth rate difference does not fall within the standard range and marks that the injected amount of the radiation is insufficient;
when Δ V is less than or equal to Δ Vmax, the statistical unit judges that the actually-conforming event growth speed difference value belongs to a standard range, and sends an instruction to reduce the moving speed of the PET scanning unit to the adjusting unit.
Further, when the statistical unit determines that the actually conforming event growth speed difference value belongs to the standard range and sends an instruction to decrease the moving speed of the PET scan cell to the statistical unit, the adjusting unit records the adjusted moving speed of the PET scan cell as D1, and sets D1 as D0 x (1- (. DELTA.V/. DELTA.Vmax)), where D0 presets the moving speed of the PET scan cell.
Further, when the statistical unit judges that the actually-met event growth speed difference does not belong to the standard range and marks that the injection amount of the radioactive substance is insufficient, the PET scanning unit stops scanning, compares the growth speed excess amount Va with a preset growth speed excess amount Va0, selects a corresponding injection amount of the radioactive substance according to a comparison result, and sets Va-delta Vmax-delta V;
the preset increase rate excess amount Va0 includes a first preset increase rate excess amount Va1, a second preset increase rate excess amount Va2, and a third preset increase rate excess amount Va 3; the radiation injection amount comprises a first radiation injection amount Q1, a second radiation injection amount Q2, a third radiation injection amount Q3 and a fourth radiation injection amount Q4, wherein Va1 < Va2 < Va3, Q1 < Q2 < Q3 < Q4;
when Va < Va1, the statistical unit determines to set the radiation increase injection amount to the first radiation injection amount Q1;
when Va1 < Va2, the statistical unit determines to set the radiation increase injection amount as a second radiation injection amount Q2;
when Va2 < Va3, the statistical unit determines to set the radiation increase injection amount as a third radiation injection amount Q3;
when Va is larger than or equal to Va3, the statistical unit judges that the increasing injection amount of the radioactive substance is set as a fourth injection amount of the radioactive substance Q4;
when the statistical unit selects the ith radiation injection amount as the radiation increase injection amount, i is 1, 2, 3 and 4, the statistical unit records the corrected total radiation injection amount as Qa, and sets Qa to be Q0+ Qi, wherein Q0 is the preset radiation injection amount.
Further, the adjusting unit is internally provided with a minimum moving speed Dmin of the PET scanning unit, when the adjusting unit determines that the moving speed of the PET scanning unit needs to be adjusted to D1, the adjusting unit compares D1 with Dmin, when D1 is larger than or equal to Dmin, the adjusting unit determines that the moving speed of the PET scanning unit belongs to a standard range and adjusts the moving speed of the PET scanning unit to D1, and when D1 is smaller than Dmin, the adjusting unit determines that the PET scanning unit has a fault and stops scanning.
Further, the statistical unit sends an instruction to increase the moving speed of the PET scanner unit when the statistical unit determines that the moving speed of the PET scanner unit needs to be adjusted and V > V2, and the adjusting unit records the adjusted moving speed of the PET scanner unit as D2 and sets D2 to D0 x (1+ ((V-V2)/V2)).
Further, a minimum scanning time Tmin is further arranged in the adjusting unit, when the adjusting unit determines that the moving speed of the PET scanning unit needs to be adjusted to D2, the adjusting unit calculates the actual scanning time T and compares the actual scanning time T with the minimum scanning time Tmin, when T is greater than or equal to Tmin, the adjusting unit determines that the moving speed of the PET scanning unit belongs to a standard range, and adjusts the moving speed of the PET scanning unit to D2, when T is less than Tmin, the adjusting unit determines that the moving speed of the PET scanning unit does not belong to the standard range, and the statistical unit determines that the preset radioactive substance injection amount Q0 needs to be adjusted.
Further, when the statistical unit determines that the preset radiation injection amount Q0 needs to be adjusted, the statistical unit records the adjusted preset radiation injection amount as Q0b, and sets Q0b to Q0 x (1- (Tmin-T)/T).
Further, a first user age a1, a second user age a2, a third user age A3, a first preset radiation injection amount Q01, a second preset radiation injection amount Q02 and a third preset radiation injection amount Q03 are further arranged in the statistical unit, when the statistical unit determines that the user age is a1, the statistical unit sets the preset radiation injection amount to Q01, and when the statistical unit determines that the user age is Az, the statistical unit sets the preset radiation injection amount to Q0z, and z is 1, 2, 3.
Compared with the prior art, the invention has the advantages that the statistical unit counts the number of coincidence events and calculates the coincidence event growth speed of the actual coincidence events when the PET scanning unit scans the target area, compares the actual coincidence event growth speed with the preset value, and controls whether the image quality meets the standard or not according to the comparison result, on one hand, the statistical unit counts the number of coincidence events in real time, can monitor the scanning process in real time, and adjusts the moving speed of the PET scanning unit through the adjusting unit when the actual coincidence event growth speed does not meet the standard, so that the actual coincidence event growth speed meets the preset standard, and further ensures the quality of the generated first PET image, on the other hand, the statistical module can mark the injection amount of the radioactive substances during the scanning process, when the adjusting module can not only adjust the moving speed of the PET scanning unit to enable the actual coincidence event growth speed to accord with the preset standard, the counting unit marks the injection amount of the radioactive substance, the quality of the generated first PET image is ensured, meanwhile, the harm of the radioactive substance can be reduced, and further the quality of the PET-CT image is improved.
Furthermore, the statistical unit of the invention is provided with a preset coincidence event growth speed, the statistical unit counts the number of coincidence events in unit time in real time in the scanning process of the PET scanning unit, calculates the actual coincidence event growth speed according to the number of coincidence events in unit time, compares the actual coincidence event growth speed with the preset coincidence event growth speed, and controls the quality of the first PET image through the comparison result, on one hand, the statistical unit counts the number of coincidence events in real time, can monitor the scanning process in real time, and when the actual coincidence event growth speed does not meet the standard, the adjusting unit adjusts the moving speed of the PET scanning unit, can make the actual coincidence event growth speed accord with the preset standard, and further ensures the quality of the generated first PET image, on the other hand, the counting module can mark the injection amount of the radioactive substance in the scanning process, and when the adjusting module cannot make the actual event increase speed meet the preset standard only by adjusting the moving speed of the PET scanning unit, the counting unit marks the injection amount of the radioactive substance, so that the quality of the generated first PET image is ensured, meanwhile, the damage of the radioactive substance can be reduced, and further, the quality of the PET-CT image is improved.
Furthermore, the maximum value of the difference value of the growth rate of the coincidence events is preset in the statistical unit of the invention, and during the scanning process of the PET scanning unit, by calculating the actual coincidence event growth speed difference, comparing the actual coincidence event growth speed difference with a preset value, and selecting a corresponding adjusting mode according to the comparison result, on one hand, the scanning process can be monitored in real time by presetting the maximum value of the coincidence event growth speed difference, and can accurately adjust the system according to the actual event-conforming growth speed difference value so as to ensure the quality of the first PET image, on the other hand, the comparison of the statistical unit can accurately mark the radioactive substance injection quantity meeting the standard, and further, the quality of the generated first PET image can be ensured, and meanwhile, the quality of the PET-CT image is further improved.
Further, when the adjusting unit reduces the moving speed of the PET scanning unit, the moving speed of the PET scanning unit is finely adjusted according to the actual event-conforming growth speed difference, so that the actual event-conforming growth speed meets the standard, and the scanning process can be monitored in real time to ensure the quality of the first PET image.
Furthermore, in the embodiment of the invention, a plurality of growth rate excess amounts and a plurality of injected radiation amounts are preset in the statistical unit, and when the statistical unit determines that the event growth rate is excessive and the actual event growth rate meets the standard by reducing the moving speed of the PET scanning unit, the statistical unit increases the injected radiation amount to enable the event growth rate to meet the standard, thereby ensuring the quality of the first PET image.
Further, the minimum value Dmin of the moving speed of the PET scanning unit is arranged in the adjusting unit, when the adjusting unit determines that the moving speed of the PET scanning unit needs to be adjusted to D1, the adjusting unit determines that the moving speed of the PET scanning unit after adjustment does not belong to a standard range, the adjusting unit determines that the PET scanning unit has a fault and stops scanning, and the scanning process can be accurately controlled and the fault of the system can be timely found through real-time comparison of the adjusting unit, so that the quality of the generated first PET image can be ensured, and the service life of the system can be prolonged.
Further, when the adjusting unit increases the moving speed of the PET scanning unit, the moving speed of the PET scanning unit is finely adjusted according to the actual event growth speed, so that the actual event growth speed meets the standard, and the scanning process can be monitored in real time to ensure the quality of the first PET image.
Furthermore, the adjusting and adjusting unit of the embodiment of the present invention is further provided with a minimum scanning time value, when the adjusting unit adjusts the moving speed of the PET scanning unit, the adjusting unit calculates the real-time scanning time of the PET scanning unit to select a corresponding adjusting manner, on one hand, when the scanning time is in a standard range, the adjusting unit determines that the moving speed of the PET scanning unit is in the standard range, and adjusts the moving speed of the PET scanning unit to D2 through the adjusting unit, so that the working efficiency of the system of the present invention can be increased while the quality of the first PET image is ensured, on the other hand, when the scanning time is not in the standard range, the adjusting unit determines that the moving speed of the PET scanning unit is not in the standard range, and through presetting the injection amount of the radioactive substance, so that while the quality of the first PET image is ensured, reduce the damage caused by the radiation.
Furthermore, when the statistical unit determines that the injection amount of the radiation needs to be increased, the statistical unit reduces the preset coincidence event growth speed so that the actual growth speed of the coincidence event meets the standard, and then the scanning process can be monitored in real time to ensure the quality of the first PET image.
Drawings
FIG. 1 is a block diagram of an intelligent PET/CT linked scanning system according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a block diagram of the intelligent PET/CT linked scanning system according to an embodiment of the present invention includes:
a PET scanning module to scan a target region and generate a first PET image; the PET scanning module comprises a PET scanning unit used for scanning a target area, a PET position unit used for determining the target area, a statistical unit used for counting the number of coincidence events, an adjusting unit used for adjusting the moving speed of the scanning unit and a PET image generating unit used for generating a PET image; when the PET scanning unit scans the target area, the statistical unit counts the actual coincidence event growth speed in the coincidence event and compares the actual coincidence event growth speed with a preset value, the statistical unit judges that the actual coincidence event growth speed is greater than the preset value, the adjusting unit increases the moving speed of the PET scanning unit and marks the decrease of the injection amount of the radioactive substance by the statistical unit so as to enable the actual coincidence event growth speed to accord with the standard, the statistical unit judges that the actual coincidence event growth speed is less than the preset value, the adjusting unit decreases the moving speed of the PET scanning unit and marks the increase of the injection amount of the radioactive substance by the statistical unit so as to enable the actual coincidence event growth speed to accord with the standard.
The CT scanning module is connected with the PET scanning module and used for scanning a target region and generating a first CT image; the CT scanning module comprises a CT scanning unit used for scanning a target area, a CT position unit used for determining the target area and a CT image generating unit used for generating a CT image;
the image reconstruction module is respectively connected with the PET scanning module and the CT scanning module and used for reconstructing the first PET image and the first CT image and generating a PET-CT image when reconstruction is finished;
the storage module is respectively connected with the PET scanning module, the CT scanning module and the image reconstruction module and used for storing data; wherein, the storage module is also stored with the user radioactive substance injection amount.
Specifically, when the system works, the PET position unit acquires the position to be scanned of the user, and marks the target area as the target area, when the marking is finished, the PET position unit sends the target area to the PET scanning unit, the PET scanning unit scans the target area, and sends the scanning result to the PET image generation unit to generate a first PET image, in the scanning process, the statistical unit counts the number of coincidence events, calculates the actual coincidence event growth speed according to the counted number of coincidence events, compares the actual coincidence event growth speed with the preset value when the calculation is finished, and sending an adjusting instruction to the adjusting unit according to the comparison result, wherein the adjusting unit adjusts the PET scanning unit according to the instruction of the counting unit so as to enable the event-meeting rate to meet the standard.
Specifically, when the PET image generates a first PET image, the first PET image is sent to the image reconstruction module to reconstruct the first PET image, when the first PET image is generated, the CT scanning module scans a target region and generates a first CT image, the CT scanning module sends the first CT image to the image reconstruction module, and the image reconstruction module reconstructs the first CT image and generates a PET-CT image when reconstruction is completed.
Specifically, in the embodiment of the invention, when the PET scanning unit scans the target region, the statistical unit counts the number of coincidence events and calculates the coincidence event growth rate of the actual coincidence events, compares the actual coincidence event growth rate with a preset value, and controls whether the image quality meets the standard through the comparison result When the standard is used, the statistical unit marks the injection amount of the radioactive substance, so that the quality of the generated first PET image is ensured, meanwhile, the harm of the radioactive substance can be reduced, and the quality of the PET-CT image is further improved.
Specifically, when the PET scanning unit scans the target region, the counting unit counts the number of coincidence events in unit time in real time to calculate an actual coincidence event growth speed V of the coincidence events, compares the actual coincidence event growth speed V with a preset coincidence event growth speed V0, and determines whether the first PET image quality meets the standard according to the comparison result;
the preset coincidence event growth rate V0 includes a first preset coincidence event growth rate V1 and a second preset coincidence event growth rate V2, wherein V1 < V2;
when V is less than V1, the statistical unit judges that the actual event growth rate is not in accordance with the standard, the first PET image quality is not in accordance with the standard, and the moving speed of the PET scanning unit needs to be adjusted;
when V is not less than V1 and not more than V2, the statistical unit judges that the actual event growth rate meets the standard and the first PET image quality meets the standard;
when V is larger than V2, the statistical unit judges that the actual coincidence event growth speed does not accord with the standard, and the first PET image quality does not accord with the standard, and the moving speed of the PET scanning unit needs to be adjusted.
Specifically, in the embodiment of the present invention, a preset coincidence event growth rate is set in a statistical unit, the statistical unit counts the number of coincidence events in unit time in real time during the scanning process of a PET scanning unit, calculates an actual coincidence event growth rate according to the number of coincidence events in unit time, compares the actual coincidence event growth rate with the preset coincidence event growth rate, and controls the quality of a first PET image according to the comparison result, in one aspect, the statistical unit counts the number of coincidence events in real time, can monitor the scanning process in real time, and adjusts the moving speed of the PET scanning unit through an adjusting unit when the actual coincidence event growth rate does not meet a standard, so that the actual coincidence event growth rate can meet the preset standard, thereby ensuring the quality of the generated first PET image, on the other hand, the counting module can mark the injection amount of the radioactive substance in the scanning process, and when the adjusting module cannot make the actual event increase speed meet the preset standard only by adjusting the moving speed of the PET scanning unit, the counting unit marks the injection amount of the radioactive substance, so that the quality of the generated first PET image is ensured, meanwhile, the damage of the radioactive substance can be reduced, and further, the quality of the PET-CT image is improved.
Specifically, when the statistical unit judges that the moving speed of the PET scanning unit needs to be adjusted and V is less than V1, the statistical unit calculates an actual coincidence event growth speed difference Δ V, compares the actual coincidence event growth speed difference Δ V with a preset coincidence event growth speed difference maximum value Δ Vmax, selects an adjustment mode according to a comparison result, and sets that Δ V is V1-V;
when Δ V > Δvmax, the statistical unit determines that the actual coincidence event growth rate difference does not fall within the standard range and marks that the injected amount of the radiation is insufficient;
when Δ V is less than or equal to Δ Vmax, the statistical unit judges that the actually-conforming event growth speed difference value belongs to a standard range, and sends an instruction to reduce the moving speed of the PET scanning unit to the adjusting unit.
Specifically, the maximum value of the difference of the growth rates of the coincidence events is preset in the statistical unit according to the embodiment of the present invention, and during the scanning process of the PET scanning unit, by calculating the actual coincidence event growth speed difference, comparing the actual coincidence event growth speed difference with a preset value, and selecting a corresponding adjusting mode according to the comparison result, on one hand, the scanning process can be monitored in real time by presetting the maximum value of the coincidence event growth speed difference, and can accurately adjust the system according to the actual event-conforming growth speed difference value so as to ensure the quality of the first PET image, on the other hand, the comparison of the statistical unit can accurately mark the radioactive substance injection quantity meeting the standard, and further, the quality of the generated first PET image can be ensured, and meanwhile, the quality of the PET-CT image is further improved.
Specifically, when the statistical unit determines that the actual coincidence event growth speed difference belongs to the standard range and sends an instruction to decrease the moving speed of the PET scanning unit to the statistical unit, the adjusting unit records the moving speed of the PET scanning unit after adjustment as D1, and sets D1 as D0 x (1- (. DELTA.V/. DELTA.Vmax)), where D0 presets the moving speed of the PET scanning unit.
Specifically, when the adjusting unit reduces the moving speed of the PET scanning unit, the moving speed of the PET scanning unit is finely adjusted according to the actual event-conforming growth speed difference, so that the actual event-conforming growth speed meets the standard, and the scanning process can be monitored in real time to ensure the quality of the first PET image.
Specifically, when the statistical unit judges that the actually-met event growth speed difference does not belong to the standard range and marks that the injection amount of the radioactive substance is insufficient, the PET scanning unit stops scanning, compares the growth speed excess amount Va with a preset growth speed excess amount Va0, selects the corresponding injection amount of the radioactive substance according to the comparison result, and sets Va-delta Vmax-delta V;
the preset increase rate excess amount Va0 includes a first preset increase rate excess amount Va1, a second preset increase rate excess amount Va2, and a third preset increase rate excess amount Va 3; the radiation injection amount comprises a first radiation injection amount Q1, a second radiation injection amount Q2, a third radiation injection amount Q3 and a fourth radiation injection amount Q4, wherein Va1 < Va2 < Va3, Q1 < Q2 < Q3 < Q4;
when Va < Va1, the statistical unit determines to set the radiation increase injection amount to the first radiation injection amount Q1;
when Va1 < Va2, the statistical unit determines to set the radiation increase injection amount as a second radiation injection amount Q2;
when Va2 < Va3, the statistical unit determines to set the radiation increase injection amount as a third radiation injection amount Q3;
when Va is larger than or equal to Va3, the statistical unit judges that the increasing injection amount of the radioactive substance is set as a fourth injection amount of the radioactive substance Q4;
when the statistical unit selects the ith radiation injection amount as the radiation increase injection amount, i is 1, 2, 3 and 4, the statistical unit records the corrected total radiation injection amount as Qa, and sets Qa to be Q0+ Qi, wherein Q0 is the preset radiation injection amount.
Specifically, in the embodiment of the invention, a plurality of growth rate overruns and a plurality of injected radiation amounts are preset in the statistical unit, and when the statistical unit determines that the event growth rate is excessive and the actual event growth rate meets the standard by reducing the moving speed of the PET scanning unit, the statistical unit increases the injected radiation amount to enable the event growth rate to meet the standard, thereby ensuring the quality of the first PET image.
Specifically, the adjusting unit is further provided with a minimum moving speed Dmin of the PET scanning unit, when the adjusting unit determines that the moving speed of the PET scanning unit needs to be adjusted to D1, the adjusting unit compares D1 with Dmin, when D1 is larger than or equal to Dmin, the adjusting unit determines that the moving speed of the PET scanning unit belongs to a standard range and adjusts the moving speed of the PET scanning unit to D1, and when D1 is smaller than Dmin, the adjusting unit determines that the PET scanning unit has a fault and stops scanning.
Specifically, the minimum value Dmin of the moving speed of the PET scanning unit is set in the adjusting unit in the embodiment of the present invention, when the adjusting unit determines that the moving speed of the PET scanning unit needs to be adjusted to D1, the adjusting unit determines that the moving speed of the PET scanning unit after adjustment does not belong to a standard range, the adjusting unit determines that the PET scanning unit has a fault and stops scanning, and the scanning process can be accurately controlled and the fault of the system can be timely found through real-time comparison of the adjusting unit, so that the service life of the system can be prolonged while the quality of the generated first PET image is ensured.
Specifically, the statistical unit sends an instruction to increase the moving speed of the PET scanner unit when it determines that the moving speed of the PET scanner unit needs to be adjusted and V > V2, and the adjusting unit records the adjusted moving speed of the PET scanner unit as D2 and sets D2 to D0 x (1+ ((V-V2)/V2)).
Specifically, when the adjusting unit increases the moving speed of the PET scanning unit, the moving speed of the PET scanning unit is finely adjusted according to the actual event growth speed, so that the actual event growth speed meets the standard, and the scanning process can be monitored in real time to ensure the quality of the first PET image.
Specifically, a minimum scanning time Tmin is further arranged in the adjusting unit, when the adjusting unit determines that the moving speed of the PET scanning unit needs to be adjusted to D2, the adjusting unit calculates the actual scanning time T and compares the actual scanning time T with the minimum scanning time Tmin, when T is greater than or equal to Tmin, the adjusting unit determines that the moving speed of the PET scanning unit belongs to a standard range, and adjusts the moving speed of the PET scanning unit to D2, when T is less than Tmin, the adjusting unit determines that the moving speed of the PET scanning unit does not belong to the standard range, and the statistical unit determines that the preset radioactive substance injection amount Q0 needs to be adjusted.
Specifically, the adjusting and adjusting unit of the embodiment of the present invention is further provided with a minimum scanning time value, and when the adjusting unit adjusts the moving speed of the PET scanning unit, the adjusting unit calculates the real-time scanning time of the PET scanning unit to select a corresponding adjusting mode, on one hand, when the scanning time belongs to a standard range, the adjusting unit determines that the moving speed of the PET scanning unit belongs to the standard range, and adjusts the moving speed of the PET scanning unit to D2 through the adjusting unit, so that the working efficiency of the system of the present invention can be increased while the quality of the first PET image is ensured, on the other hand, when the scanning time does not belong to the standard range, the adjusting unit determines that the moving speed of the PET scanning unit does not belong to the standard range, and by presetting the injection amount of the radiation, so that the quality of the first PET image is ensured, reduce the damage caused by the radiation.
Specifically, when the statistical unit determines that the preset radiation injection amount Q0 needs to be adjusted, the statistical unit records the adjusted preset radiation injection amount as Q0b, and sets Q0b to Q0 x (1- (Tmin-T)/T).
Specifically, when the statistical unit corrects the total amount of radiation injection to Qa, the statistical unit corrects the preset coincidence event growth rate V0 according to the actually selected amount of radiation injection, and the statistical unit records the corrected preset coincidence event growth rate as V0', and sets V0 ═ V0 x (1- (Qi/Q0)), i ═ 1, 2, 3, 4.
Specifically, when the statistical unit determines that the injection amount of the radiation needs to be increased, the statistical unit reduces the preset coincidence event growth rate to enable the actual growth rate of the coincidence event to meet the standard, so that the scanning process can be monitored in real time to ensure the quality of the first PET image.
Specifically, a first user age a1, a second user age a2, a third user age A3, a first preset radiation injection amount Q01, a second preset radiation injection amount Q02 and a third preset radiation injection amount Q03 are further provided in the counting unit, when the counting unit determines that the user age is a1, the counting unit sets the preset radiation injection amount to Q01, and when the counting unit determines that the user age is Az, the counting unit sets the preset radiation injection amount to Q0z, and z is 1, 2, 3.
Specifically, a plurality of user ages and preset radiation injection amounts are preset in the counting unit, and when PET scanning is performed, the corresponding preset radiation injection amounts can be selected according to different user ages, so that corresponding radiation can be injected according to different age groups, and the damage caused by the radiation can be reduced while the quality of the first PET image is ensured.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An intelligent PET/CT linked scanning system, comprising:
a PET scanning module to scan a target region and generate a first PET image; the PET scanning module comprises a PET scanning unit used for scanning a target area, a PET position unit used for determining the target area, a statistical unit used for counting the number of coincidence events, an adjusting unit used for adjusting the moving speed of the scanning unit and a PET image generating unit used for generating a PET image; when the PET scanning unit scans a target area, the statistical unit counts the actual coincidence event growth speed in a coincidence event and compares the actual coincidence event growth speed with a preset value, when the statistical unit judges that the actual coincidence event growth speed is greater than the preset value, the adjusting unit increases the moving speed of the PET scanning unit, and the statistical unit marks the reduction of the injection amount of the radioactive substance so as to enable the actual coincidence event growth speed to accord with a standard, and when the statistical unit judges that the actual coincidence event growth speed is less than the preset value, the adjusting unit reduces the moving speed of the PET scanning unit, and the statistical unit marks the increase of the injection amount of the radioactive substance so as to enable the actual coincidence event growth speed to accord with the standard;
the CT scanning module is connected with the PET scanning module and used for scanning a target region and generating a first CT image; the CT scanning module comprises a CT scanning unit used for scanning a target area, a CT position unit used for determining the target area and a CT image generating unit used for generating a CT image;
the image reconstruction module is respectively connected with the PET scanning module and the CT scanning module and used for reconstructing the first PET image and the first CT image and generating a PET-CT image when reconstruction is finished;
the storage module is respectively connected with the PET scanning module, the CT scanning module and the image reconstruction module and used for storing data; wherein, the storage module is also used for storing the injection amount of the user radioactive substances.
2. The intelligent PET/CT linkage scanning system according to claim 1, wherein when the PET scanning unit scans the target area, the statistical unit counts the number of coincident events in unit time in real time to calculate an actual coincident event growth speed V of the coincident events, compares the actual coincident event growth speed V with a preset coincident event growth speed V0, and determines whether the quality of the first PET image meets the standard according to the comparison result;
the preset coincidence event growth rate V0 includes a first preset coincidence event growth rate V1 and a second preset coincidence event growth rate V2, wherein V1 < V2;
when V is less than V1, the statistical unit judges that the actual event growth rate is not in accordance with the standard, the first PET image quality is not in accordance with the standard, and the moving speed of the PET scanning unit needs to be adjusted;
when V is not less than V1 and not more than V2, the statistical unit judges that the actual event growth rate meets the standard and the first PET image quality meets the standard;
when V > V2, the statistical unit determines that the actual coincidence event growth rate does not meet the criteria, and the first PET image quality does not meet the criteria, and the moving speed of the PET scanning unit needs to be adjusted.
3. The intelligent PET/CT linkage scanning system according to claim 2, wherein when the statistical unit determines and needs to adjust the moving speed of the PET scanning unit and V is less than V1, the statistical unit calculates an actual coincidence event growth speed difference Δ V, compares the actual coincidence event growth speed difference Δ V with a preset coincidence event growth speed difference maximum value Δ Vmax, selects an adjustment mode according to the comparison result, and sets Δ V = V1-V;
when Δ V > Δvmax, the statistical unit determines that the actual coincidence event growth rate difference does not fall within the standard range and marks that the injected amount of the radiation is insufficient;
when Δ V is less than or equal to Δ Vmax, the statistical unit judges that the actually-conforming event growth speed difference value belongs to a standard range, and sends an instruction to reduce the moving speed of the PET scanning unit to the adjusting unit.
4. The intelligent PET/CT linked scanning system according to claim 3, wherein when said statistical unit determines that the actually conforming event growth speed difference value belongs to the standard range and sends an instruction to decrease the moving speed of said PET scanning unit to said statistical unit, said adjusting unit records the adjusted moving speed of said PET scanning unit as D1, and sets D1= D0 x (1- (. DELTA.V/. DELTA.Vmax)), where D0 is the moving speed of the preset PET scanning unit.
5. The intelligent PET/CT linkage scanning system according to claim 4, wherein when the statistical unit judges that the actually-conforming event growth speed difference does not belong to the standard range and marks that the radiation injection amount is insufficient, the PET scanning unit stops scanning, compares the growth speed excess amount Va with a preset growth speed excess amount Va0, selects a corresponding radiation injection amount according to the comparison result, and sets Va =ΔVmax- Δ V;
the preset increase rate excess amount Va0 includes a first preset increase rate excess amount Va1, a second preset increase rate excess amount Va2, and a third preset increase rate excess amount Va 3; the radiation injection amount comprises a first radiation injection amount Q1, a second radiation injection amount Q2, a third radiation injection amount Q3 and a fourth radiation injection amount Q4, wherein Va1 < Va2 < Va3, Q1 < Q2 < Q3 < Q4;
when Va < Va1, the statistical unit determines to set the radiation increase injection amount to the first radiation injection amount Q1;
when Va1 < Va2, the statistical unit determines to set the radiation increase injection amount as a second radiation injection amount Q2;
when Va2 < Va3, the statistical unit determines to set the radiation increase injection amount as a third radiation injection amount Q3;
when Va is larger than or equal to Va3, the statistical unit judges that the increasing injection amount of the radioactive substance is set as a fourth injection amount of the radioactive substance Q4;
and when the statistical unit selects the ith radiation injection amount as the radiation increase injection amount, i =1, 2, 3 and 4, the statistical unit records the corrected radiation injection total amount as Qa and sets Qa = Q0+ Qi, wherein Q0 is the preset radiation injection amount.
6. The intelligent PET/CT linkage scanning system according to claim 5, wherein the adjusting unit is further provided with a minimum value Dmin of the moving speed of the PET scanning unit, when the adjusting unit determines that the moving speed of the PET scanning unit needs to be adjusted to D1, the adjusting unit compares D1 with Dmin, when D1 is greater than or equal to Dmin, the adjusting unit determines that the moving speed of the PET scanning unit belongs to a standard range and adjusts the moving speed of the PET scanning unit to D1, and when D1 is less than Dmin, the adjusting unit determines that the PET scanning unit has a fault and stops scanning.
7. The intelligent PET/CT linked scanning system according to claim 2, wherein said statistical unit sends an instruction to increase the moving speed of said PET scanner unit when said statistical unit determines that the moving speed of said PET scanner unit needs to be adjusted and V > V2, and said adjusting unit records the adjusted moving speed of said PET scanner unit as D2, setting D2= D0 x (1+ ((V-V2)/V2)).
8. The intelligent PET/CT linkage scanning system according to claim 7, wherein a minimum scanning time Tmin is further arranged in the adjusting unit, when the adjusting unit determines that the moving speed of the PET scanning unit needs to be adjusted to D2, the adjusting unit calculates the actual scanning time T and compares the actual scanning time T with the minimum scanning time Tmin, when T is larger than or equal to Tmin, the adjusting unit determines that the moving speed of the PET scanning unit belongs to a standard range, and adjusts the moving speed of the PET scanning unit to D2, when T is smaller than Tmin, the adjusting unit determines that the moving speed of the PET scanning unit does not belong to the standard range, and the statistical unit determines that the preset radiation injection quantity Q0 needs to be adjusted.
9. The intelligent PET/CT linked scanning system according to claim 8, wherein when said statistical unit determines that the preset radiation injection amount Q0 needs to be adjusted, said statistical unit records the adjusted preset radiation injection amount as Q0b, and sets Q0b = Q0 x (1- (Tmin-T)/T).
10. The intelligent PET/CT linkage scanning system according to claim 1, wherein a first user age A1, a second user age A2, a third user age A3, a first preset radiation injection amount Q01, a second preset radiation injection amount Q02 and a third preset radiation injection amount Q03 are further disposed in the statistical unit, when the statistical unit determines that the user age is A1, the statistical unit sets the preset radiation injection amount to Q01, and when the statistical unit determines that the user age is Az, the statistical unit sets the preset radiation injection amount to Q0z, and z =1, 2, 3.
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