A method for automatically selecting scan protocols and modifying scan parameters in CT examinations

Abstract

The application relates to the field of medical imaging technology and discloses a method for automatically selecting a scanning protocol and correcting scanning parameters in CT examination, which comprises the following steps: step 1, a paper examination application form is photographed, and a patient ID, an examination item and a submission reason are recognized according to the photographed paper examination application form; step 2, a scanning protocol is matched according to the examination item as a current scanning protocol; step 3, a previous examination of the patient is found from an image archiving and communication system, and scanning parameters of the previous examination are acquired; step 4, scanning parameters of the current scanning protocol are weighted and estimated according to the scanning parameters of the previous examination, and the scanning parameters of the current scanning protocol are updated according to the weighted and estimated scanning parameters; and step 5, a patient is subjected to CT scanning according to the updated scanning parameters of the current scanning protocol. By using the application scheme, the working strength and complexity of technicians can be reduced, and the overall efficiency and quality of CT examination can be improved.

Description

TECHNICAL FIELD

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

[0002] Medical imaging is an important part of modern medicine. In CT scanning examination, scanning parameter setting is a very important link. Even if the hardware device has high precision, it cannot obtain the best scanning image if the parameters are not set reasonably. In the scanning process, the scanning parameter setting is usually divided into two steps: the first step is to select a scanning protocol. The scanning protocol is a set of scanning parameter templates. The second step is to fine-tune the scanning parameters according to the patient's condition. Reasonable selection of scanning protocol and adjustment of specific parameters are crucial to the scanning results. Currently, technicians manually select protocols and adjust parameters in hospitals. The work efficiency of technicians is low when manually operating, and the scanning results are greatly affected by human factors. In addition, for review cases, there is no reference to the previous examination results, and the specific adjustments in the scanning parameters cannot be inherited, which may result in poor quality of the scanning results. SUMMARY

[0003] The present application provides a method for automatically selecting a scanning protocol and modifying scanning parameters in CT examination, which can realize automatic selection of scanning protocol and adjustment of parameters, and solve the problems of low scanning efficiency, being easily affected by human factors, and being unable to refer to previous examination results in the prior art.

[0004] To this end, the present application provides the following technical solutions:

[0005] A method for automatically selecting a scanning protocol and modifying scanning parameters in CT examination, the method comprising:

[0006] Step 1: taking a paper examination application form, and identifying the patient ID, examination item and submission reason according to the taken paper examination application form;

[0007] Step 2: matching a scanning protocol according to the examination item as a current scanning protocol;

[0008] Step 3: finding the previous examination of the patient from the picture archiving and communication system;

[0009] Step 4: obtaining the scanning parameters of the previous examination according to the previous examination of the patient, weighting and estimating the scanning parameters of the current scanning protocol according to the scanning parameters of the previous examination, and updating the scanning parameters of the current scanning protocol according to the weighted and estimated scanning parameters;

[0010] Step 5: performing CT scanning on the patient according to the updated scanning parameters of the current scanning protocol.

[0011] Optionally, in step 1, the paper examination application sheet is photographed to obtain an image of the paper examination application sheet, and an identification result is obtained by performing OCR identification on the image of the paper examination application sheet; and a patient ID, an examination item and a submission reason are found from the identification result according to specific keywords.

[0012] Optionally, step 1 further includes: acquiring the patient ID from a radiology information system, and determining whether the patient ID identified from the paper examination application sheet is consistent with the patient ID acquired from the radiology information system; if the patient IDs are inconsistent, a technician manually selects a scanning protocol as the current scanning protocol, and the process proceeds to step 3; if the patient IDs are consistent, the process proceeds to step 2.

[0013] Optionally, in step 2, a corresponding scanning protocol is found in a pre-set examination item and scanning protocol mapping table through the examination item, and the scanning protocol corresponding to the examination item found is taken as the current scanning protocol; if the finding fails, a scanning protocol is matched according to the submission reason, that is, a scanning part and a scanning type are acquired by analyzing the submission reason, and a scanning protocol is matched in the examination item and scanning protocol mapping table according to the scanning part and the scanning type; when the matching succeeds, the matched scanning protocol is taken as the current scanning protocol; and when the matching fails, a technician manually selects a scanning protocol as the current scanning protocol.

[0014] Optionally, step 3 includes:

[0015] Step 31: all previous examination data of the patient are retrieved in a picture archiving and communication system according to the patient ID; when there is previous examination data of the patient, the process proceeds to step 32, otherwise, the process proceeds to step 5;

[0016] Step 32: a scout image in the previous examination of the patient is downloaded, and a body mass index (BMI) and a scanning protocol code in the scout image are acquired from patient information;

[0017] Step 33: it is determined whether the scanning protocol code in the scout image of the previous examination of the patient is the same as a scanning protocol code of the current scanning protocol; when the scanning protocol codes are the same, the process proceeds to step 34, otherwise, the process proceeds to step 35;

[0018] Step 34: the previous examination of the patient with the same scanning protocol code as the scanning protocol code of the current scanning protocol is stored; and the process proceeds to step 35;

[0019] Step 35: it is determined whether there is other previous examination of the patient; when there is other previous examination of the patient, the process returns to step 32; and when there is no other previous examination of the patient, the process proceeds to step 4.

[0020] Optionally, in step 4, obtaining the scanning parameters of previous examinations based on the patient's previous examinations includes extracting the scanning parameters of previous examinations from the stored medical digital imaging and communication files of the patient's previous examinations, which have 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 previous examinations from the medical digital imaging and communication file.

[0021] Optionally, in step 4, when weighting the scan parameters of the current scan protocol based on previously checked scan parameters, the formula for calculating the tube voltage is:

[0022]

[0023] In the formula, Sp is the current value of the voltage of the test tube. Let kt be the value of the tube voltage during the i-th previous inspection. i kb is the time-weighted coefficient for the i-th previous check value. i Let be the body type matching coefficient of the i-th previous examination, and n be the total number of previous examinations found.

[0024] Time weighting coefficient kt i According to the time decay effect, the closer the check is to the current time, the more kt... i The larger, the more kt i The calculation formula is as follows:

[0025] kt i =

[0026] Where λ is the attenuation coefficient. The time elapsed since the i-th check, in months;

[0027] Body type matching coefficient kb i The calculation is based on the patient's Body Mass Index (BMI), using the following formula:

[0028] kb i =

[0029] BMI now The patient's current BMI, BMI i Let BMI be the BMI at the i-th examination. stand Standard BMI, BMI stand Values ​​were taken based on the patient's age group; when the patient's BMI was not recorded, kb i The value is 1.

[0030] Optionally, in step 5, the technician confirms the scanning parameters according to the updated scanning parameters of the current scanning protocol, 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, frames the scanning part with a rectangle on the positioning image, and performs CT scanning on the patient.

[0031] An apparatus for automatically selecting a scanning protocol and correcting scanning parameters in CT examination, the apparatus comprising:

[0032] A character recognition module for recognizing a patient ID, an examination item, and a submission reason from a photographed paper examination application form;

[0033] A previous examination searching module for finding previous examinations of the patient from a picture archiving and communication system (PACS);

[0034] A scanning parameter extracting module for extracting scanning parameters of the previous examinations from the previous examinations of the patient;

[0035] A scanning console for matching a scanning protocol as a current scanning protocol according to the examination item, weighting and estimating scanning parameters of the current scanning protocol according to the scanning parameters of the previous examinations, updating the scanning parameters of the current scanning protocol according to the weighted and estimated scanning parameters, and performing CT scanning on the patient according to the updated scanning parameters of the current scanning protocol.

[0036] A computer readable storage medium having a computer program stored thereon, the computer program being executed by a processor to perform the steps of the method for automatically selecting a scanning protocol and correcting scanning parameters in CT examination.

[0037] The method for automatically selecting a scanning protocol and correcting scanning parameters in CT examination provided by the application can automatically select a scanning protocol, automatically adjust scanning parameters and automatically set a scanning range according to previous examination data, and automatically select and adjust a CT scanning protocol and parameters by means of an optical character recognition (OCR) technology, an image recognition technology, and a previous examination matching technology, thereby reducing the work intensity and complexity of a technician and improving the overall efficiency and quality of CT examination. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0039] Figure 1 The flowchart of the method for automatically selecting a scanning protocol and correcting scanning parameters in CT examination in a specific embodiment of the application;

[0040] Figure 2 Fig. 1 is a schematic diagram of the structure of the device for automatically selecting a scanning protocol and modifying scanning parameters in CT examination in an embodiment of the present application;

[0041] Figure 3 Fig. 2 is a schematic diagram of the flow of CT automatic scanning in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0043] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts should fall within the scope of the present application.

[0044] As shown in Fig. 1, it is a flowchart of the method for automatically selecting a scanning protocol and modifying scanning parameters in CT examination in an embodiment of the present application, which comprises the following steps: Figure 1

[0045] Step 101: A paper examination application form is photographed, and a patient ID, an examination item and a submission reason are identified according to the photographed paper examination application form.

[0046] The paper examination application form is photographed by a high-speed scanner, and an image of the photographed paper examination application form is obtained from the high-speed scanner. The image of the paper examination application form is subjected to optical character recognition (OCR) identification, and the patient ID, the examination item and the submission reason are found from the identification result according to specific keywords.

[0047] The patient ID is obtained from a radiology information system (RIS). It is determined whether the patient ID identified from the paper examination application form is consistent with the patient ID obtained from the RIS system. If not, the technician is prompted to manually select a scanning protocol as a current scanning protocol, and the flow proceeds to step 103. If yes, the flow proceeds to step 102.

[0048] Step 102: A scanning protocol is matched according to the examination item as the current scanning protocol.

[0049] ​The corresponding scan protocol is found by checking the examination item in the examination item and scan protocol mapping table set in advance (when the software is first run), and if the search is successful, the scan protocol corresponding to the examination item found is taken as the current scan protocol; if the search is unsuccessful, the scan protocol is matched according to the reason for submission, that is, the scan site (head, upper abdomen, liver, etc.) and scan type (plain scan, spiral, enhancement, etc.) are obtained by analyzing the reason for submission, and the scan protocol (the scan site and scan type are stored in the protocol) is matched in the examination item and scan protocol mapping table according to the scan site and scan type, and when the matching is successful, the matched scan protocol is taken as the current scan protocol; when the matching is unsuccessful, the technician manually selects the scan protocol as the current scan protocol.

[0050] Step 103, find the patient's previous examination in the picture archiving and communication system, and obtain the scan parameters of the previous examination. Specifically, it includes:

[0051] Step 31, judge whether there is a patient's previous examination in the PACS.

[0052] According to the patient ID, all previous examinations of the patient are searched in the picture archiving and communication system (PACS). When there is a previous examination, the process enters step 32, otherwise, the process enters step 105.

[0053] Step 32, download the scout image in the previous examination, and obtain the body mass index BMI from the patient information and the scan protocol code in the scout image, that is, the scan protocol ID. Each scan protocol has a unique scan protocol code, and according to this code, it can be quickly judged whether the scan protocol is the same.

[0054] Step 33, judge whether the scan protocol code in the scout image of the previous examination is the same as the scan protocol code of the current scan protocol, when the scan protocol codes are the same, the process enters step 34, otherwise the process enters step 35.

[0055] Step 34, store the patient's previous examination with the same scan protocol code as the current scan protocol; the process enters step 35;

[0056] Step 35, judge whether there is other previous examination, if there is other previous examination, the process returns to step 32, when there is no other previous examination, the process enters step 104.

[0057] Step 104, extracting the scan parameters (except scan range) of the previous examination from the stored previous examination, the extraction method is to download the Digital Imaging and Communications in Medicine (DICOM) file of the first image for each CT scan sequence, and parse the scan parameters from the file. CT scan sequence refers to a set of images collected by using a set of preset scan parameters for a specific diagnostic purpose in a CT examination.

[0058] According to the scan parameters of the previous examination, the scan parameters of the current scan protocol are weighted and estimated, and the scan parameters of the current scan protocol are updated according to the weighted and estimated scan parameters.

[0059] The specific calculation formula is as follows, which is mainly applied to the tube voltage and tube current parameters:

[0060]

[0061] Taking the tube voltage as an example, in the formula, Sp is the value of the tube voltage of the current examination, is the value of the tube voltage of the i-th previous examination, kt i is the time weighting coefficient of the i-th previous examination value, kb i is the body type matching coefficient of the i-th previous examination, and n is the total number of found previous examinations.

[0062] Time weighting coefficient kt i According to the time decay effect, the closer to the current examination, the larger kt i , the larger kt i The calculation formula is as follows:

[0063] kt i = , wherein λ is the decay coefficient, is the time of the i-th examination from the current, in months.

[0064] Body type matching coefficient kb i Depend on the patient's body mass index BMI for calculation, the formula is as follows:

[0065] kb i = , wherein BMI now is the current BMI of the patient, BMI i is the BMI at the i-th examination, and BMI stand is the standard BMI. BMI standAccording to the patient age, 6 years old or less is 16.5, 6-12 years old is 17.5, 12-65 years old is 21, 65-80 years old is 23, and 80 years old or more is 24. i For the tube current parameter, kb i Fixed as 1.

[0066] The scan console compares the current scan parameters with the estimated scan parameters from the previous examination, modifies the different places to the parameters extracted from the previous examination, and displays all the modified points to the technician.

[0067] Step 105, according to the scan parameters of the current scan protocol, CT scanning is performed on the patient.

[0068] The technician confirms the scan parameters according to the updated scan parameters of the current scan protocol, starts the scout image, records the scan protocol code in the scout image, and quickly judges whether the scan protocol is the same through the scout image of the previous examination. The scan protocol codes are the same, which means that the scan protocols are the same. The scout image is identified to find the specific part to be scanned (such as head, lung, heart, etc.), and the scan part is framed with a rectangular frame on the scout image, and the CT scanning of the patient is completed.

[0069] Correspondingly, the embodiment of the application also provides a device for automatically selecting a scan protocol and modifying scan parameters in CT examination, as shown in Figure 2 Fig. 1 is a structural schematic diagram of the device. The device for automatically selecting a scan protocol and modifying scan parameters in CT examination comprises the following modules:

[0070] The character recognition module 21 recognizes the patient ID, examination item and submission reason from the photographed paper examination application sheet;

[0071] The previous examination searching module 22 finds the previous examination of the patient from the picture archiving and communication system;

[0072] The scan parameter extraction module 23 extracts the scan parameters of the previous examination from the previous examination;

[0073] The scan console 24 matches the scan protocol as the current scan protocol according to the examination item, and weights and estimates the scan parameters of the current scan protocol according to the scan parameters of the previous examination. According to the scan parameters after the weighted estimation, the scan parameters of the current scan protocol are updated. According to the updated scan parameters of the current scan protocol, CT scanning is performed on the patient.

[0074] In an embodiment, the device for automatically selecting a scanning protocol and modifying scanning parameters in a CT examination further comprises a scanning site identification module 25. After the technician confirms the scanning parameters according to the updated scanning parameters of the current scanning protocol and starts a positioning image, the scanning site identification module identifies the positioning image and finds the specific scanning site, and then frames the scanning site with a rectangle on the positioning image.

[0075] Reference Figure 3 is a process of CT scanning automation using the above system:

[0076] Step 0, start examination. After the technician completes patient information registration (manual registration or from the RIS system), the technician prepares to start scanning.

[0077] Step 1, the scanning console 24 obtains the patient ID from the examination registration information of the RIS system.

[0078] Step 2, the technician takes a paper examination application form by using a high-speed scanner; the scanning console 24 obtains the image of the taken paper examination application form from the high-speed scanner.

[0079] Step 3, the text recognition module 21 is called to perform OCR recognition on the application form image, and the patient ID, examination item and submission reason are found from the recognition result according to specific keywords.

[0080] Step 4, the scanning console 24 judges whether the patient ID recognized in the application form is the same as the ID obtained from the RIS. If not, the technician is prompted to manually select a scanning protocol; if yes, the next step is entered.

[0081] Step 5, match the scanning protocol according to the examination item. The scanning console 24 finds the corresponding scanning protocol in the examination item and scanning protocol mapping table set in advance (when the scanning software is initially run) through the examination item; if the matching is successful, step 7 is entered; if the matching fails, step 6 is entered.

[0082] Step 6, match the scanning protocol according to the submission reason. The scanning console 24 finds the most suitable protocol (the scanning site and scanning type are stored in the protocol) in the protocol list according to the scanning site (head, upper abdomen, liver, etc.), scanning type (plain scan, spiral, enhancement, etc.) and submission reason. If no suitable protocol is found, the technician is prompted to manually select a protocol.

[0083] Step 7, the scanning console 24 enters the protocol parameter adjustment interface and starts scanning parameter editing.

[0084] Step 8, the scan console 24 calls the previous examination retrieval module 22 to retrieve all previous examinations of the patient in the Picture Archiving and Communication System (PACS) according to the patient ID. If no examination is found, go to step 14; if there are previous examinations, go to step 9.

[0085] Step 9, download the scout image of the current examination and get the body mass index (BMI) from the patient information. Get the scan protocol of the examination, download the DICOM file of the scout image of the examination, and parse the scan protocol code from the file.

[0086] Step 10, determine whether the scan protocol code of the previous examination is the same as the scan protocol code of the current scan protocol. If they are the same, return the scan protocol of the previous examination to the scan console 24 and go to step 11; if they are different, go directly to step 11.

[0087] Step 11, determine whether there are other previous examinations. If there are other previous examinations, return to step 9; if there are not, go to step 12.

[0088] Step 12, for all previous examinations with the same scan protocol code as the current scan protocol code, get the scan parameters of all scan sequences of the current examination. The scan console 24 calls the scan parameter extraction module 23 to extract the scan parameters (except for the scan range) of the previous examination from the previous examination found in step 10. The extraction method is to download the DICOM file of the first image for each scan sequence and parse the scan parameters from the file.

[0089] Step 13, estimate the current parameters. Weighted estimation of the current scan parameters is performed based on the previous examination scan parameters. The specific calculation formula is as follows, mainly applied to tube voltage and tube current parameters:

[0090]

[0091] Take tube voltage as an example, where Sp is the value of the current examination tube voltage, is the value of the tube voltage in the i-th previous examination, kt i is the time weighting coefficient of the i-th previous examination value, kb i is the body shape matching coefficient of the i-th previous examination, and n is the total number of found previous examinations.

[0092] Time weighting coefficient kt i According to the time decay effect, the closer to the current examination, the larger the kt i , the larger the kt i The calculation formula of kt

[0093] kt i = where λ is the attenuation coefficient, is the distance from the current time to the i-th examination in months.

[0094] Body size matching coefficient kb i which is calculated according to the patient's body mass index (BMI) and is calculated as follows:

[0095] kb i = where BMI now is the current BMI of the patient, BMI i is the BMI at the i-th examination, and BMI stand is the standard BMI. The value of BMI stand is selected according to the patient's age group, and is 16.5 for patients under 6 years old, 17.5 for patients aged 6-12 years old, 21 for patients aged 12-65 years old, 23 for patients aged 65-80 years old, and 24 for patients over 80 years old. When the patient's BMI is not recorded, kb i is 1, and for the tube current parameter, kb i is fixed as 1.

[0096] Step 14, updating the current protocol parameters. The scan console 24 compares the current scan parameters with the estimated scan parameters from the previous examination, modifies the different parameters to the parameters extracted from the previous examination, and displays all the modified parameters to the technician.

[0097] Step 15, the technician confirms the parameters and starts the scan positioning image; the scan protocol code is recorded in the positioning image.

[0098] Step 16, the scan console 24 calls the scan site recognition module 25 to recognize the positioning image and find the specific site to be scanned (for example, head, lung, heart, etc.), and frames the scan site with a rectangle on the positioning image.

[0099] It should be noted that, for the foregoing method embodiments, in order to simply describe, they are all described as a series of action combinations, but those skilled in the art should know that the present application is not limited to the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0100] The present application also provides a storage medium, which is a computer readable storage medium, and a computer program is stored on the storage medium, and the computer program can execute the method according to the present application when running. Figure 1The storage medium can include a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, etc. The storage medium can also include a non-volatile memory or a non-transitory memory, etc.

[0101] The above-described embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, the above-described 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 programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are wholly or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server, or data provider to another via wired or wireless means.

[0102] The above describes the embodiments of the present application in detail, and the present application is described by using specific implementation manners. The above description of the embodiments is only used to help understand the method and system of the present application, and only represents a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application, and the content of the specification should not be understood as a limitation of the present application. Therefore, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for automatically selecting a scan protocol and scan parameter modification in a CT examination, characterized by, The method comprises: Step 1, taking a paper examination application form, and identifying a patient ID, an examination item and a submission reason according to the taken paper examination application form; Step 2, matching a scanning protocol according to the examination item as a current scanning protocol; Step 3, finding a previous examination of the patient from a picture archiving and communication system; Step 4, obtaining scanning parameters of the previous examination according to the previous examination of the patient, performing weighted estimation on scanning parameters of the current scanning protocol according to the scanning parameters of the previous examination, and updating the scanning parameters of the current scanning protocol according to the scanning parameters after the weighted estimation; Step 5, performing CT scanning on the patient according to the updated scanning parameters of the current scanning protocol; Wherein, when the scanning parameters of the current scanning protocol are weighted estimated according to the scanning parameters of the previous examination, the calculation formula of tube voltage is: where Sp is the value of the tube voltage of the current examination, is the value of the tube voltage of the ith prior examination, and i is the time weighting factor for the ith prior examination value, and i is the body size matching factor for the ith prior examination, and n is the sum of the number of prior examinations found. Time weighting coefficient kt i According to the time decay effect, the closer the examination to the current time, kt i The greater, kt i The calculation formula is as follows: kt i = where λ is the decay coefficient, is the distance in months from the current time to the ith check. Body-matching coefficient kb i The calculation is made on the basis of the patient's body mass index, BMI, according to the formula: kb i = where BMI now is the current BMI of the patient, BMI i is the BMI at the i-th examination, BMI stand is the standard BMI, BMI stand is valued according to the age group of the patient, and k i is 1 if the patient's BMI is not recorded.

2. The method of automatically selecting a scan protocol and scan parameter modification in a CT examination of claim 1, wherein, In step 1, the paper examination application form is taken to obtain an image of the paper examination application form, OCR recognition is performed on the image of the paper examination application form to obtain a recognition result, and a patient ID, an examination item and a submission reason are found from the recognition result according to specific keywords.

3. The method of automatically selecting a scan protocol and scan parameter modification in a CT examination of claim 2, wherein, Step 1 further comprises obtaining a patient ID from a radiology information system, judging whether the patient ID identified from the paper examination application form is consistent with the patient ID obtained from the radiology information system, if the patient IDs are inconsistent, a technician manually selects a scanning protocol as the current scanning protocol, and the process goes to step 3; If the patient IDs are consistent, the process goes to step 2.

4. The method for automatically selecting a scan protocol and scan parameter modification in a CT examination of claim 1, wherein, In step 2, the corresponding scanning protocol is found in a pre-set examination item and scanning protocol mapping table through the examination item, the scanning protocol corresponding to the examination item found is taken as the current scanning protocol when the finding is successful; when the finding fails, a scanning protocol is matched according to the submission reason, that is, a scanning part and a scanning type are obtained by analyzing the submission reason, the scanning protocol is matched in the examination item and scanning protocol mapping table according to the scanning part and the scanning type, and the matched scanning protocol is taken as the current scanning protocol when the matching is successful; when the matching fails, a technician manually selects a scanning protocol as the current scanning protocol.

5. The method for automatically selecting a scan protocol and scan parameter modification in a CT examination of claim 1, wherein, Step 3 comprises: Step 31, searching for all previous examination data of the patient in the picture archiving and communication system according to the patient ID; when there is previous examination data of the patient, the process goes to step 32, otherwise, the process goes to step 5; Step 32, downloading a positioning picture in the previous examination of the patient, and obtaining a body mass index BMI from patient information and a scanning protocol code in the positioning picture; Step 33, judging whether the scanning protocol code in the positioning picture of the previous examination of the patient is the same as the scanning protocol code of the current scanning protocol, when the scanning protocol codes are the same, the process goes to step 34, otherwise, the process goes to step 35; Step 34, storing the previous examination of the patient with the same scanning protocol code as the scanning protocol code of the current scanning protocol; the process goes to step 35; Step 35, judging whether there is other past examination of the patient, if there is other past examination of the patient, the flow returns to step 32, when there is no other past examination of the patient, the flow enters step 4.

6. The method of automatically selecting a scan protocol and scan parameter modification in a CT examination of claim 5, wherein, In step 4, the acquiring scanning parameters of past examination according to past examination of the patient comprises: extracting scanning parameters of past examination from stored medical digital imaging and communication files of past examination of the patient with the same scanning protocol code as the current scanning protocol, that is, downloading the medical digital imaging and communication file of the first image for each CT scanning sequence, and parsing the scanning parameters of past examination from the medical digital imaging and communication file.

7. The method for automatically selecting a scan protocol and scan parameter modification in a CT examination of claim 1, wherein, In step 5, the technician confirms the scanning parameters according to the updated scanning parameters of the current scanning protocol, starts the scanning positioning image, records the scanning protocol code in the positioning image, identifies the positioning image, finds the specific scanning part, frames the scanning part with a rectangular on the positioning image, and performs CT scanning on the patient.

8. An apparatus for automatically selecting a scan protocol and scan parameter modification in a CT examination, characterized by, The device comprises: a character recognition module for recognizing the patient ID, examination item and submission reason from the photographed paper examination application sheet; a past examination searching module for finding the past examination of the patient from the picture archiving and communication system; a scanning parameter extraction module for extracting the scanning parameters of past examination from the past examination of the patient; a scanning master console for matching the scanning protocol as the current scanning protocol according to the examination item, weighting and estimating the scanning parameters of the current scanning protocol according to the scanning parameters of past examination, updating the scanning parameters of the current scanning protocol according to the weighted and estimated scanning parameters, and performing CT scanning on the patient according to the updated scanning parameters of the current scanning protocol, wherein, when the scanning parameters of the current scanning protocol are weighted and estimated according to the scanning parameters of past examination, the calculation formula of tube voltage is: where Sp is the value of the tube voltage of the current examination, is the value of the tube voltage of the ith prior examination, and i is the time weighting factor for the ith prior examination value, and i is the body size matching factor for the ith prior examination, and n is the sum of the number of prior examinations found. Time weighting coefficient kt i According to the time decay effect, the closer the examination to the current time, the larger kt i is, and the closer the examination to the current time, the larger kt i The calculation formula is as follows: kt i = where λ is the decay coefficient, is the distance in months from the current time for the ith check. Body-matching coefficient kb i The calculation is made on the basis of the patient's body mass index, BMI, according to the formula: kb i = where BMI now is the current BMI of the patient, BMI i is the BMI at the i-th examination, BMI stand is the standard BMI, and BMI stand is the BMI at the last examination. The value of k i is 1 if the patient's BMI is not recorded.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is run by the processor to execute the steps of the method for automatically selecting the scanning protocol and correcting the scanning parameters in CT examination according to any one of claims 1 to 7. The computer program is run by the processor to execute the steps of the method for automatically selecting the scanning protocol and correcting the scanning parameters in CT examination according to any one of claims 1 to 7.

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