Method for automatically selecting scanning protocol and correcting scanning parameters in CT (Computed Tomography) examination

Abstract

The invention relates to the technical field of medical images, and discloses a method for automatically selecting a scanning protocol and correcting scanning parameters in CT (Computed Tomography) examination, which comprises the following steps of: 1, shooting a paper examination application form, and identifying a patient ID (Identity), an examination item and an examination reason according to the shot paper examination application form; step 2, matching a scanning protocol as a current scanning protocol according to the inspection item; step 3, finding past examinations of the patient from the image filing and communication system, and obtaining scanning parameters of the past examinations; step 4, performing weighted estimation on the scanning parameters of the current scanning protocol according to the scanning parameters checked previously, and updating the scanning parameters of the current scanning protocol according to the scanning parameters subjected to weighted estimation; and 5, performing CT scanning on the patient according to the updated scanning parameters of the current scanning protocol. By means of the scheme, the working intensity and complexity of technicians can be reduced, and the overall efficiency and quality of CT examination are improved.

Description

Technical Field

[0001] The present invention relates to the field of medical imaging technology, and in particular to a method for automatically selecting a scanning protocol and correcting scanning parameters in a CT examination. Background Art

[0002] Medical imaging is an essential component of modern medicine. During CT scans, setting scan parameters is crucial. No matter how precise the hardware, improper parameter settings will prevent optimal scan images. During the scanning process, setting scan parameters is typically a two-step process. The first step is selecting a scan protocol, which is a set of scan parameter templates. The second step is fine-tuning these parameters based on the patient's condition. Choosing the right scan protocol and adjusting specific parameters are crucial for optimal scan results. Currently, hospitals rely on technicians manually selecting protocols and adjusting parameters. This manual process is inefficient, and scan results are significantly affected by human factors. Furthermore, for review cases, without a reference to previous examination results, specific adjustments to scan parameters cannot be inherited, potentially resulting in poor scan quality. Summary of the Invention

[0003] The present invention provides a method for automatically selecting scanning protocols and correcting scanning parameters in CT examinations, which can realize automated scanning protocol selection and parameter adjustment, and solve the problems of low scanning efficiency, susceptibility to human factors, and inability to refer to previous examination results in the prior art.

[0004] To this end, the present invention provides the following technical solutions: A method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination, the method comprising: Step 1: photograph the paper examination application form and identify the patient ID, examination items and reason for examination based on the photographed paper examination application form; Step 2: Match the scan protocol according to the inspection item as the current scan protocol; Step 3: Find the patient's previous examinations from the image archiving and communication system; Step 4: obtaining scanning parameters of previous examinations based on the patient's previous examinations, performing weighted estimation on the scanning parameters of the current scanning protocol based on the scanning parameters of the previous examinations, and updating the scanning parameters of the current scanning protocol based on the weighted estimated scanning parameters; Step 5: Perform a CT scan on the patient according to the updated scanning parameters of the current scanning protocol.

[0005] Optionally, in step 1, the paper inspection application form is photographed to obtain an image of the paper inspection application form, the image of the paper inspection application form is subjected to OCR recognition to obtain a recognition result, and the patient ID, inspection items and reasons for inspection are found from the recognition result according to specific keywords.

[0006] Optionally, step 1 also includes obtaining the patient ID from the radiology department information system, and determining whether the patient ID identified from the paper examination application form is consistent with the patient ID obtained from the radiology department information system. If the patient ID is inconsistent, the technician manually selects the scanning protocol as the current scanning protocol, and the process enters step 3; if the patient ID is consistent, the process enters step 2.

[0007] Optionally, in step 2, the corresponding scanning protocol is searched in the pre-set inspection item and scanning protocol mapping table through the inspection item. If the search is successful, the scanning protocol corresponding to the inspection item is used as the current scanning protocol; if the search fails, the scanning protocol is matched according to the reason for inspection, that is, by analyzing the reason for inspection, the scanning part and scanning type are obtained, and the scanning protocol is matched in the inspection item and scanning protocol mapping table according to the scanning part and scanning type. When the match is successful, the matched scanning protocol is used as the current scanning protocol; when the match fails, the technician manually selects the scanning protocol as the current scanning protocol.

[0008] Optionally, step 3 includes: Step 31: Retrieve all the patient's previous examination data from the image archiving and communication system based on the patient ID; if the patient's previous examination data exists, the process proceeds to step 32; otherwise, the process proceeds to step 5; Step 32: Download the patient's previous scout image and obtain the body mass index (BMI) and the scan protocol code in the scout image from the patient information. Step 33, determining whether the scan protocol code in the scout image of the patient's previous examination is the same as the scan protocol code of the current scan protocol. If the scan protocol codes are the same, the process proceeds to step 34; otherwise, the process proceeds to step 35; Step 34, storing the patient's previous examinations with the same scan protocol code as the current scan protocol; the process proceeds to step 35; Step 35, determine whether there are other previous examinations for the patient. If there are other previous examinations for the patient, the process returns to step 32. When there are no other previous examinations for the patient, the process enters step 4.

[0009] Optionally, in step 4, obtaining the scanning parameters of the previous examination based on the patient's previous examination includes extracting the scanning parameters of the previous examination from a stored medical digital imaging and communication file of the patient's previous examination with the same scanning protocol code as the current scanning protocol, that is, for each CT scan sequence, downloading the medical digital imaging and communication file of the first image, and parsing the scanning parameters of the previous examination from the medical digital imaging and communication file.

[0010] Optionally, in step 4, when weighted estimation of the scanning parameters of the current scanning protocol is performed based on the scanning parameters of previous examinations, the calculation formula of the tube voltage is:

[0011] Where Sp is the current value of the inspection tube voltage, is the tube voltage value in the i-th previous inspection, kt i is the time weighting coefficient of the i-th previous inspection value, kb i is the body shape matching coefficient of the i-th previous examination, and n is the total number of previous examinations found; Time weighting coefficient kt i According to the time decay effect, the closer the inspection is to the current time, the faster the kt i The bigger, kt i The calculation formula is as follows: kt i =

[0012] Where λ is the attenuation coefficient, The time from the i-th check to the present time, in months; Body shape matching coefficient kb i The calculation is based on the patient's body mass index (BMI), using the following formula: kb i =

[0013] BMI now is the patient's current BMI, BMI i is the BMI at the time of the i-th examination, BMI stand BMI is the standard BMI, stand The value is determined based on the patient's age group. If the patient's BMI is not recorded, kb i is 1.

[0014] Optionally, in step 5, the technician confirms the scanning parameters according to the updated scanning parameters of the current scanning protocol and starts scanning the positioning image; records the scanning protocol code in the positioning image; identifies the positioning image, finds the specific part to be scanned, uses a rectangular frame to mark the scanning part on the positioning image, and performs a CT scan on the patient.

[0015] A device for automatically selecting a scanning protocol and modifying scanning parameters during a CT examination, the device comprising: The text recognition module identifies the patient ID, examination items, and reasons for the examination based on the photographed paper examination application form; Previous examination retrieval module, which finds the patient's previous examinations from the image archiving and communication system; A scanning parameter extraction module extracts scanning parameters of previous examinations from the patient's previous examinations; The scanning console matches a scanning protocol as the current scanning protocol according to the examination item; and performs a weighted estimate of the scanning parameters of the current scanning protocol based on the scanning parameters of the previous examination, and updates the scanning parameters of the current scanning protocol based on the weighted estimate of the scanning parameters; and performs a CT scan on the patient based on the updated scanning parameters of the current scanning protocol.

[0016] A computer-readable storage medium stores a computer program, which, when executed by a processor, executes the steps of the method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination.

[0017] The method for automatically selecting scanning protocols and correcting scanning parameters during CT examinations provided by the present invention can automatically select scanning protocols, automatically adjust scanning parameters and automatically set the scanning range based on previous examination data. It relies on optical character recognition (OCR) technology, image recognition technology, previous examination matching and other technologies to achieve automated CT scanning protocol selection and parameter adjustment, reducing the technician's workload and complexity, and improving the overall efficiency and quality of CT examinations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0019] Figure 1 This is a flow chart of a method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination in a specific embodiment of the present invention; Figure 2 Schematic diagram of the structure of a device for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination in a specific embodiment of the present invention; Figure 3 Schematic diagram of the process of performing CT automated scanning in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] like Figure 1 FIG. 1 is a flow chart of a method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination according to an embodiment of the present invention, comprising the following steps: Step 101: photograph a paper examination application form, and identify the patient ID, examination items, and reasons for examination based on the photographed paper examination application form.

[0023] Use a high-definition scanner to take a picture of the paper inspection application form; obtain the image of the paper inspection application form from the high-definition scanner, perform optical character recognition (OCR) on the image of the paper inspection application form, and find the patient ID, inspection items, and reasons for inspection based on specific keywords in the recognition results.

[0024] The patient ID is obtained from the Radiology Information System (RIS). A check is performed to determine whether the patient ID identified from the paper examination request form matches the patient ID obtained from the RIS. If they are different, the technician is prompted to manually select a scan protocol as the current scan protocol, and the process proceeds to step 103. If they are the same, the process proceeds to step 102.

[0025] Step 102: Match a scan protocol according to the inspection item as the current scan protocol.

[0026] The corresponding scanning protocol is searched in the mapping table of inspection items and scanning protocols that is set in advance (when the scanning software is first run) for the inspection items. If the search is successful, the scanning protocol corresponding to the inspection item is used as the current scanning protocol; if the search fails, the scanning protocol is matched according to the reason for the inspection, that is, by analyzing the reason for the inspection, the scanning part (head, upper abdomen, liver, etc.) and the scanning type (plain scan, spiral, enhanced, etc.) are obtained, and the scanning protocol is matched in the mapping table of inspection items and scanning protocols according to the scanning part and scanning type (the scanning part and scanning type are stored in the protocol). When the match is successful, the matched scanning protocol is used as the current scanning protocol; when the match fails, the technician manually selects the scanning protocol as the current scanning protocol.

[0027] Step 103: Find the patient's previous examinations from the image archiving and communication system and obtain the scanning parameters of the previous examinations. This includes: Step 31: Determine whether there is any previous examination of the patient in the PACS.

[0028] All previous examinations of the patient are retrieved from the Picture Archiving and Communication System (PACS) according to the patient ID. If there are previous examinations, the process proceeds to step 32; otherwise, the process proceeds to step 105.

[0029] Step 32: Download the locator image from the previous examination and obtain the body mass index (BMI) and the scan protocol code (i.e., scan protocol ID) in the locator image from the patient information. Each scan protocol has a unique scan protocol code, and this code can be used to quickly determine whether the scan protocols are the same.

[0030] Step 33 , determining whether the scanning protocol code in the previously examined locator image is the same as the scanning protocol code of the current scanning protocol. If the scanning protocol codes are the same, the process proceeds to step 34 , otherwise the process proceeds to step 35 .

[0031] Step 34, storing the patient's previous examinations with the same scan protocol code as the current scan protocol; the process proceeds to step 35; In step 35 , it is determined whether there are other previous examinations. If there are other previous examinations, the process returns to step 32 . If there are no other previous examinations, the process proceeds to step 104 .

[0032] Step 104 extracts the scan parameters (excluding the scan range) from the stored past examinations. This extraction method downloads the Digital Imaging and Communications in Medicine (DICOM) file for the first image of each CT scan sequence and parses the scan parameters from the file. A CT scan sequence is a set of images acquired during a CT scan using a set of preset scan parameters for a specific diagnostic purpose.

[0033] A weighted estimate is performed on the scan parameters of the current scan protocol based on the scan parameters of previous examinations, and the scan parameters of the current scan protocol are updated based on the weighted estimate of the scan parameters.

[0034] The specific calculation formula is as follows, which is mainly applied to tube voltage and tube current parameters:

[0035] Taking tube voltage as an example, Sp is the current value of the inspection tube voltage. is the tube voltage value in the i-th previous inspection, kt i is the time weighting coefficient of the i-th previous inspection value, kb i is the body shape matching coefficient of the i-th previous examination, and n is the total number of previous examinations found.

[0036] Time weighting coefficient kt i According to the time decay effect, the closer the inspection is to the current one, the shorter the kt i The bigger, kt i The calculation formula is as follows: kt i = , where λ is the attenuation coefficient, The time from the i-th check to the present time, in months.

[0037] Body shape matching coefficient kb i The calculation is based on the patient's body mass index (BMI), using the following formula: kb i = , where BMI now is the patient's current BMI, BMI i is the BMI at the time of the i-th examination, BMI stand is the standard BMI. stand The value is determined based on the patient's age group: 16.5 for those under 6 years old, 17.5 for those 6-12 years old, 21 for those 12-65 years old, 23 for those 65-80 years old, and 24 for those over 80 years old. If the patient's BMI is not recorded, kb i is 1, for tube current parameters, kb i Fixed to 1.

[0038] The scanning console compares the current scanning parameters with the estimated scanning parameters from the previous examination, modifies the differences to the parameters extracted from the previous examination, and displays all modified points to the technician.

[0039] Step 105: Perform a CT scan on the patient according to the scan parameters of the current scan protocol.

[0040] The technician confirms the scanning parameters based on the updated scanning parameters of the current scanning protocol and starts scanning the scout image; records the scanning protocol code in the scout image, and can quickly determine whether the scanning protocol is the same through the scout images of previous examinations. If the scanning protocol code is the same, it means that the scanning protocol is the same; recognizes the scout image, finds the specific part to be scanned (such as the head, lungs, heart, etc.), and uses a rectangular frame to mark the scanning part on the scout image to complete the CT scan of the patient.

[0041] Accordingly, an embodiment of the present invention further provides a device for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination, such as Figure 2 FIG. 1 is a schematic diagram of the structure of the device. The device for automatically selecting scanning protocols and modifying scanning parameters in CT examinations includes the following modules: The text recognition module 21 recognizes the patient ID, examination items and reasons for the examination based on the photographed paper examination application form; a previous examination retrieval module 22 for finding the patient's previous examinations from the image archiving and communication system; A scanning parameter extraction module 23 extracts scanning parameters of previous examinations from previous examinations; The scanning console 24 matches a scanning protocol as the current scanning protocol according to the examination item; and performs a weighted estimate of the scanning parameters of the current scanning protocol based on the scanning parameters of the previous examination, and updates the scanning parameters of the current scanning protocol based on the weighted estimate of the scanning parameters; and performs a CT scan on the patient based on the updated scanning parameters of the current scanning protocol.

[0042] In one embodiment, the device for automatically selecting a scanning protocol and modifying scanning parameters in the CT examination further includes a scanning part identification module 25. The technician confirms the scanning parameters based on the updated scanning parameters of the current scanning protocol. After starting to scan the positioning image, the scanning part identification module identifies the positioning image, finds the specific part to be scanned, and uses a rectangular frame to mark the scanning part on the positioning image.

[0043] refer to Figure 3 , is the process of automating CT scanning using the above system: Step 0: Start the examination. After the technician completes the patient information registration (manual registration or obtaining from the RIS system), he / she is ready to start scanning.

[0044] Step 1: The scanning console 24 obtains the patient ID from the examination registration information of the RIS system.

[0045] Step 2: The technician uses a high-definition camera to photograph the paper inspection application form; the scanning console 24 obtains the photographed image of the paper inspection application form from the high-definition camera.

[0046] Step 3: Call the text recognition module 21 to perform OCR recognition on the application form image, and find the patient ID, examination items and reasons for examination from the recognition results based on specific keywords.

[0047] Step 4: The scanning console 24 determines whether the patient ID identified in the application form is the same as the ID obtained from the RIS. If they are different, the technician is prompted to manually select a scanning protocol. If they are the same, the process proceeds to the next step.

[0048] Step 5: Match the scanning protocol to the inspection item. The scanning console 24 searches for the corresponding scanning protocol in the pre-set inspection item and scanning protocol mapping table (when the scanning software is first run) based on the inspection item. If the search is successful, the process proceeds to step 7; if the search fails, the process proceeds to step 6.

[0049] Step 6: Match the scan protocol based on the reason for the scan. The scan console 24 analyzes the reason for the scan and finds the most appropriate protocol from the protocol list (storing the scan location and scan type) based on the scan location and scan type. If no suitable protocol is found, the technician is prompted to manually select a protocol.

[0050] Step 7: Scan the console 24 to enter the protocol parameter adjustment interface and start editing the scan parameters.

[0051] In step 8, the scanning console 24 calls the previous examination retrieval module 22 and searches the Picture Archiving and Communication System (PACS) for all previous examinations for the patient based on the patient ID. If no previous examinations are found, the process proceeds to step 14; if previous examinations are found, the process proceeds to step 9.

[0052] Step 9: Download the scout image for the examination and obtain the body mass index (BMI) from the patient information. Obtain the scan protocol for the examination, download the DICOM file of the scout image for the examination, and parse the scan protocol code from it.

[0053] Step 10, determine whether the scanning protocol code of the previously checked scanning protocol is the same as the scanning protocol code of the current scanning protocol. If they are the same, return the previously checked scanning protocol to the scanning console 24 and then proceed to step 11; if they are different, directly proceed to step 11.

[0054] Step 11, determine whether there are other previous examinations. If there are other previous examinations, the process returns to step 9; if not, go to step 12.

[0055] Step 12: For all previous examinations with the same scan protocol code as the current one, the scan parameters for all scan sequences are obtained. The scan console 24 calls the scan parameter extraction module 23 to extract the scan parameters (excluding the scan range) from the previous examinations found in step 10. This extraction method downloads the DICOM file of the first image in each scan sequence and parses the scan parameters from the file.

[0056] Step 13: Estimate current parameters. Perform a weighted estimate of current scan parameters based on previous scan parameters. The specific calculation formula is as follows, which is mainly applied to tube voltage and tube current parameters:

[0057] Taking tube voltage as an example, Sp is the current value of the inspection tube voltage. is the tube voltage value in the i-th previous inspection, kt i is the time weighting coefficient of the i-th previous inspection value, kb i is the body shape matching coefficient of the i-th previous examination, and n is the total number of previous examinations found.

[0058] Time weighting coefficient kt i According to the time decay effect, the closer the inspection is to the current one, the shorter the kt i The bigger, kt i The calculation formula is as follows: kt i = , where λ is the attenuation coefficient, The time from the i-th check to the present time, in months.

[0059] Body shape matching coefficient kb i The calculation is based on the patient's body mass index (BMI), using the following formula: kb i = , where BMI now is the patient's current BMI, BMI i is the BMI at the time of the i-th examination, BMI stand is the standard BMI. stand The value is determined based on the patient's age group: 16.5 for those under 6 years old, 17.5 for those 6-12 years old, 21 for those 12-65 years old, 23 for those 65-80 years old, and 24 for those over 80 years old. If the patient's BMI is not recorded, kb i is 1, for tube current parameters, kb i Fixed to 1.

[0060] Step 14: Update current protocol parameters. The scanning console 24 compares the current scanning parameters with the scanning parameters estimated from previous examinations, modifies the differences to the parameters extracted from previous examinations, and displays all modified points to the technician.

[0061] Step 15: The technician confirms the parameters and starts scanning the locator image; the scanning protocol code is recorded in the locator image.

[0062] In step 16, the scanning console 24 calls the scanning part recognition module 25 to recognize the scouting image, find the specific part to be scanned (such as the head, lungs, heart, etc.), and use a rectangular frame to mark the scanning part on the scouting image.

[0063] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, because according to the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0064] The present invention also provides a storage medium, which is a computer-readable storage medium having a computer program stored thereon, and the computer program can be executed when it is run. Figure 1 The storage medium may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. The storage medium may also include a non-volatile memory or a non-transitory memory.

[0065] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data provider to another website, computer, server or data provider via wired or wireless means.

[0066] The embodiments of the present invention are described in detail above. Specific implementation methods are used herein to illustrate the present invention. The description of the above embodiments is only used to help understand the method and system of the present invention. They are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention, and the content of this specification should not be understood as limiting the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination, characterized in that: The method comprises: Step 1: photograph the paper examination application form and identify the patient ID, examination items and reason for examination based on the photographed paper examination application form; Step 2: Match the scan protocol according to the inspection item as the current scan protocol; Step 3: Find the patient's previous examinations from the image archiving and communication system; Step 4: obtaining scanning parameters of previous examinations based on the patient's previous examinations, performing weighted estimation on the scanning parameters of the current scanning protocol based on the scanning parameters of the previous examinations, and updating the scanning parameters of the current scanning protocol based on the weighted estimated scanning parameters; Step 5: Perform a CT scan on the patient according to the updated scanning parameters of the current scanning protocol.

2. The method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination according to claim 1, characterized in that: In step 1, the paper inspection application form is photographed to obtain an image of the paper inspection application form, the image of the paper inspection application form is subjected to OCR recognition to obtain a recognition result, and the patient ID, inspection items and reasons for inspection are found from the recognition result according to specific keywords.

3. The method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination according to claim 2, characterized in that: Step 1 also includes obtaining a patient ID from the radiology department information system, determining whether the patient ID identified from the paper examination application form is consistent with the patient ID obtained from the radiology department information system, and if the patient IDs are inconsistent, the technician manually selects a scan protocol as the current scan protocol, and the process proceeds to step 3; If the patient IDs match, the process proceeds to step 2.

4. The method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination according to claim 1, wherein: In step 2, the corresponding scanning protocol is searched for in the pre-set mapping table of inspection items and scanning protocols through the inspection items. If the search is successful, the scanning protocol corresponding to the inspection item is used as the current scanning protocol; if the search fails, the scanning protocol is matched according to the reason for inspection, that is, the scanning part and scanning type are obtained by analyzing the reason for inspection, and the scanning protocol is matched in the mapping table of inspection items and scanning protocols according to the scanning part and scanning type. When the match is successful, the matched scanning protocol is used as the current scanning protocol; when the match fails, the technician manually selects a scanning protocol as the current scanning protocol.

5. The method for automatically selecting scanning protocols and modifying scanning parameters in CT examination according to claim 1, characterized in that: Step 3 includes: Step 31: Retrieve all the patient's previous examination data from the image archiving and communication system based on the patient ID; if the patient's previous examination data exists, the process proceeds to step 32; otherwise, the process proceeds to step 5; Step 32: Download the patient's previous scout image and obtain the body mass index (BMI) and the scan protocol code in the scout image from the patient information; Step 33, determining whether the scan protocol code in the scout image of the patient's previous examination is the same as the scan protocol code of the current scan protocol. If the scan protocol codes are the same, the process proceeds to step 34; otherwise, the process proceeds to step 35; Step 34, storing the patient's previous examinations with the same scan protocol code as the current scan protocol; the process proceeds to step 35; Step 35, determine whether there are other previous examinations for the patient. If there are other previous examinations for the patient, the process returns to step 32. When there are no other previous examinations for the patient, the process enters step 4.

6. The method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination according to claim 5, characterized in that: In step 4, obtaining the scanning parameters of the previous examination based on the patient's previous examination includes extracting the scanning parameters of the previous examination from a stored medical digital imaging and communication file of the patient's previous examination with the same scanning protocol code as the current scanning protocol, that is, for each CT scan sequence, downloading the medical digital imaging and communication file of the first image, and parsing the scanning parameters of the previous examination from the medical digital imaging and communication file.

7. The method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination according to claim 5, characterized in that: In step 4, when weighted estimation of the scanning parameters of the current scanning protocol is performed based on the scanning parameters of previous examinations, the calculation formula of the tube voltage is: Where Sp is the current value of the inspection tube voltage, is the tube voltage value in the i-th previous inspection, kt i is the time weighting coefficient of the i-th previous inspection value, kb i is the body shape matching coefficient of the i-th previous examination, and n is the total number of previous examinations found; Time weighting coefficient kt i According to the time decay effect, the closer the inspection is to the current time, the faster the kt i The larger the kt i The calculation formula is as follows: kt i = Where λ is the attenuation coefficient, The time from the i-th check to the present time, in months; Body shape matching coefficient kb i The calculation is based on the patient's body mass index (BMI), using the following formula: kb i = BMI now is the patient's current BMI, BMI i is the BMI at the time of the i-th examination, BMI stand BMI is the standard BMI, stand The value is determined based on the patient's age group. If the patient's BMI is not recorded, kb i is 1.

8. The method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination according to claim 1, characterized in that: In step 5, the technician confirms the scanning parameters based on the updated scanning parameters of the current scanning protocol and starts scanning the scout image; records the scanning protocol code in the scout image; identifies the scout image, finds the specific part to be scanned, uses a rectangular frame to mark the scanning part on the scout image, and performs a CT scan on the patient.

9. A device for automatically selecting scanning protocols and modifying scanning parameters during CT examination, characterized in that: The device comprises: The text recognition module identifies the patient ID, examination items, and reasons for the examination based on the photographed paper examination application form; Previous examination retrieval module, which finds the patient's previous examinations from the image archiving and communication system; A scanning parameter extraction module extracts scanning parameters of previous examinations from the patient's previous examinations; The scanning console matches a scanning protocol as the current scanning protocol according to the examination item; performs a weighted estimate of the scanning parameters of the current scanning protocol based on the scanning parameters of previous examinations, and updates the scanning parameters of the current scanning protocol based on the weighted estimate of the scanning parameters; and performs a CT scan on the patient based on the updated scanning parameters of the current scanning protocol.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination according to any one of claims 1 to 8 are executed.

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