CN111782836A - Nuclear magnetic resonance image acquisition processing method based on time stamp - Google Patents
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Abstract
The nuclear magnetic resonance image acquisition processing method based on the time stamp comprises the following steps: acquiring first image information of a patient by using a nuclear magnetic resonance apparatus, wherein the first image information is analog signal information; carrying out Hash coding on the collected first image information, converting the Hash coding into digital abstract data, and adding a timestamp field; adding the receiving time and date information of the digital summary data file into the timestamp field, and encrypting; the image display device decrypts the encrypted digital abstract data file to obtain second image information of the patient, the second image information is digital signal information, then the nuclear magnetic resonance image of the patient and the timestamp information of the nuclear magnetic resonance image are restored based on the second image information of the patient, and then an index is established for the nuclear magnetic resonance image based on the timestamp information of the nuclear magnetic resonance image and stored. According to the scheme, the memory consumption is reduced by adopting the Hash coding, and the retrieval speed and the retrieval accuracy are improved by increasing the timestamp field to establish the index for the nuclear magnetic resonance image.
Description
Technical Field
The invention relates to the technical field of image processing, in particular to a nuclear magnetic resonance image acquisition and processing method based on a timestamp.
Background
Nuclear magnetic Resonance imaging is to excite nuclear substances (usually, isotopic protons of hydrogen atoms) with non-zero spins placed in a static magnetic field by radio frequency electromagnetic waves (RF), generate Nuclear Magnetic Resonance (NMR), acquire magnetic Resonance signals by using an induction coil, process the signals according to a certain post-processing method, and finally image the nuclear magnetic Resonance.
Magnetic resonance imaging techniques have a number of significant advantages over CT and X-ray (e.g., they can generate detailed three-dimensional anatomical images without radiation) and are therefore widely used for disease detection, diagnosis and disease monitoring. However, the time for acquiring the images by the nuclear magnetic resonance imaging technology is long, the acquired images occupy a large memory space, and the problems of difficult retrieval, long snapshot time and non-unique snapshot result exist when the nuclear magnetic resonance images of a certain patient are taken, so that the clinical application is greatly limited.
Disclosure of Invention
In view of the foregoing defects in the prior art, an embodiment of the present invention provides a method for acquiring and processing a nuclear magnetic resonance image based on a timestamp.
The embodiment of the invention provides a nuclear magnetic resonance image acquisition and processing method based on a timestamp, which comprises the following steps:
s1, acquiring first image information of a patient by using a nuclear magnetic resonance apparatus, wherein the first image information is analog signal information;
s2, carrying out hash coding on the collected first image information, converting the first image information into digital abstract data, and sending the digital abstract data file to digital timestamp service equipment;
s3, the digital timestamp service equipment receives the digital summary data file and adds a timestamp field;
s4, adding the receiving time and date information of the digital abstract data file into the time stamp field by the digital time stamp service equipment, and encrypting the digital abstract data file added with the time stamp;
s5, the digital timestamp service equipment sends the encrypted digital summary data file to the image display equipment;
s6, the image display device decrypts the encrypted digital summary data file to obtain second image information of the patient, wherein the second image information is digital signal information;
s7, restoring the nuclear magnetic resonance image of the patient and the time stamp information of the nuclear magnetic resonance image by the image display device based on the second image information of the patient;
and S8, the image display equipment establishes an index for the nuclear magnetic resonance image based on the time stamp information of the nuclear magnetic resonance image and stores the index.
In the method for acquiring and processing a nuclear magnetic resonance image based on a timestamp as described above, the image display device preferably stores the nuclear magnetic resonance image in order based on an index of the nuclear magnetic resonance image.
In the method for processing a nuclear magnetic resonance image acquisition based on a timestamp as described above, optionally, in S4, the digital digest data file with the timestamp is encrypted by using an ECC elliptic curve encryption algorithm.
Optionally, in the method for processing a nuclear magnetic resonance image acquisition based on a timestamp as described above, in S4, the digital digest data file with the timestamp is encrypted by using an RSA encryption algorithm.
In the above-mentioned timestamp-based nuclear magnetic resonance image acquisition processing method, preferably, when the nuclear magnetic resonance image of the patient is retrieved, the nuclear magnetic resonance image of the patient is retrieved based on the index of the nuclear magnetic resonance image and is displayed through the display of the image display device.
According to the technical scheme provided by the embodiment of the invention, on one hand, the high-order image features are hashed into the compact binary hash code by adopting hash coding, so that the memory consumption is greatly reduced. On the other hand, by adding the timestamp field and establishing an index for the nuclear magnetic resonance image based on the timestamp information of the nuclear magnetic resonance image, when the nuclear magnetic resonance image of a certain patient is called, the retrieval speed of the nuclear magnetic resonance image can be improved, the situations that the retrieval result is not unique, the nuclear magnetic resonance image of a single patient is difficult to take out and adjust and the like are avoided, and the working efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a nuclear magnetic resonance image acquisition processing method based on a timestamp according to the present invention;
fig. 2A, 2B, and 2C are schematic diagrams of an application embodiment of a method for acquiring and processing a nuclear magnetic resonance image based on a timestamp according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a nuclear magnetic resonance image acquisition processing method based on a timestamp according to the present invention. Referring to fig. 1, the method of the present embodiment includes the following.
And S1, acquiring first image information of the patient by using the nuclear magnetic resonance apparatus, wherein the first image information is analog signal information.
And S2, carrying out hash coding on the collected first image information, converting the first image information into digital abstract data, and sending the digital abstract data file to the digital timestamp service equipment.
S3, the digital time stamp service device receives the digital digest data file and adds the time stamp field.
And S4, adding the receiving time and date information of the digital summary data file in the time stamp field by the digital time stamp service device, and encrypting the digital summary data file added with the time stamp.
S5, the digital time stamp service device transmits the encrypted digital digest data file to the image display device.
And S6, the image display device decrypts the encrypted digital summary data file to obtain second image information of the patient, wherein the second image information is digital signal information.
And S7, restoring the nuclear magnetic resonance image of the patient and the time stamp information of the nuclear magnetic resonance image by the image display device based on the second image information of the patient.
And S8, the image display equipment establishes an index for the nuclear magnetic resonance image based on the time stamp information of the nuclear magnetic resonance image and stores the index.
In a specific application process, the image display device preferably stores the nuclear magnetic resonance images in order based on the indexes of the nuclear magnetic resonance images. Optionally, in the step of encrypting the time-stamped digital digest data file in S4, an ECC elliptic curve encryption algorithm may be used. The time-stamped digital digest data file is encrypted as described in S4, and an RSA encryption algorithm may be used. When the nuclear magnetic resonance image of the patient is called, the nuclear magnetic resonance image of the patient can be retrieved based on the index of the nuclear magnetic resonance image and displayed through the display of the image display device.
According to the technical scheme provided by the embodiment of the invention, on one hand, the high-order image features are hashed into the compact binary hash code by adopting the hash code, so that the memory consumption is greatly reduced. On the other hand, by adding the timestamp field and establishing an index for the nuclear magnetic resonance image based on the timestamp information of the nuclear magnetic resonance image, when the nuclear magnetic resonance image of a certain patient is called, the retrieval speed of the nuclear magnetic resonance image can be improved, the situations that the retrieval result is not unique, the nuclear magnetic resonance image of a single patient is difficult to take out and adjust and the like are avoided, and the working efficiency is improved.
Fig. 2A, 2B, and 2C are schematic diagrams of an application embodiment of a method for acquiring and processing a nuclear magnetic resonance image based on a timestamp according to the present invention. Referring to fig. 2A, the method of the present embodiment includes the following.
Firstly, the nuclear magnetic resonance apparatus is used as a signal output end to output image information.
And secondly, converting the output of the nuclear magnetic resonance apparatus in the first step into a summary by using Hash coding.
On the basis of the image acquisition, information acquired by the nuclear magnetic resonance spectrometer is converted into an abstract (digest) by using hash coding, the original feature space is mapped into a compact binary space by using the hash coding, and the principle of the hash coding is as follows:
high-dimensional image data are mapped into binary hash codes, image retrieval efficiency is improved, storage space and retrieval time consumption of retrieval are reduced, and compact binary codes 0 and 1 are used for representing image feature vectors.
The discrete formula or discrete procedure is as follows:
h (x) sgn (f (x)) formula (1)
f(x)＝WTx + b type (2)
In the formula (1), the sgn function is also called a step function, which means that when the input value is greater than zero, the output value is 1, and when the input value is less than or equal to zero, the output is 0, and f (X) represents a sample X (X) with respect to zero averaging1，x2，......，xn) And (3) obtaining an output value after transformation, wherein the formula (2) is a matrix form of the transformation method, w is weight, b is constant, and the transformation and the step are added, namely, points in the sample space can be projected to a Hamming space, namely a binary space of Hash coding.
And (4) performing bitwise XOR operation, and completing high-speed retrieval according to the following sub-operations.
0 ×, 00 ═ 00 xored with 0, and the result is 0
0 × 1 ═ 10 xoring 1, and the result is 1
1 ×, 0 ═ 11, xored with 0, and the result is 1
1 ^ 01 is the same as 1 or 0
And thirdly, sending the digest converted by the Hash coding in the second step to a digital time stamp service (DST).
And fourthly, receiving the digest converted from the Hash code in the second step by digital time stamp service (DST), adding time and date to the digest and encrypting the digest. An ECC elliptic curve algorithm with a fast speed is used during encryption, the flow is shown in fig. 2B, and the process of signing the signed digest M by the sender is as follows: randomly or pseudo-randomly generating k in the range of [1.n-1 ]; k × p is calculated as shown in the following formula (3):
kp ═ x, y formula (3)
And (3) calculating r, wherein r is a random integer, and if r is 0, returning to the first step, wherein the calculation formula is shown as the following formula (4):
r＝m1mod (n) formula (4)
Calculating k-1mod(n)；
1. E is calculated, which is represented by the following formula (5):
e-SHA-1 (m) formula (5)
2. Calculating to obtain s, if the output result is 0, returning to the first step, and the calculation formula is as the following formula (6)
Shown in the specification;
s＝k-1(e + dr) mod (n) formula (6)
And (r, s) is obtained as the plaintext signature information.
Where D (Q, FR, G, a, b, n, h) is a global parameter, (Q, D) is the public and private keys of the sender, m, n are base points of the order, p is a cofactor, h, m represents the number of expansions that satisfy over the binary field GF (2m), a, b are the coefficients of the function equation (7), h is the x and y coordinates of p, and the output signature (S)0,S1)。
yZ+xy＝x3+ axZ + b type (7)
Further, the file added with the date and time information and encrypted is sent back to the display end of the image for decryption. The recipient verifies the signature (r, s) of the message M, the verification flow being as in fig. 2C:
1. so that r, s ∈ [1, n-1 ];
2. the calculation formula of e, W, u1 and u2. is as follows:
e-SHA-1 (m) formula (8)
W＝s-1mod (n) formula (9)
u1Ewmod (n) formula (10)
u2Rwmod (n) formula (11)
3. Calculating to obtain X, wherein the calculation formula is as follows:
X＝u1G+u2q type (12)
4. If X is 0, the signature is illegal, otherwise, V is calculated, wherein X is (X)1，x2) Calculating
The formula is as follows:
V＝x2mod (n) formula (13)
5. If v is r, the signature is received and the magnetic resonance image is restored.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
firstly, the synchronous time stamp method for synchronously acquiring the magnetic resonance images in the radiotherapy process adds the time stamp field on each magnetic resonance image and indexes the time stamp field, so that the sequence of the images can be obtained better.
The synchronous time stamp method for synchronously acquiring the magnetic resonance images in the radiotherapy process basically ensures the uniqueness of the magnetic resonance images.
The synchronous timestamp method for synchronously acquiring the magnetic resonance images in the radiotherapy process effectively avoids the situations of difficult retrieval and long retrieval time when the images are taken, and greatly improves the working efficiency of hospitals.
And fourthly, the synchronous timestamp method for synchronously acquiring the magnetic resonance images in the radiotherapy process adopts Hash coding, hashes the high-order image features into compact binary Hash codes, and greatly reduces the memory consumption.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A nuclear magnetic resonance image acquisition processing method based on a time stamp is characterized by comprising the following steps:
s1, acquiring first image information of a patient by using a nuclear magnetic resonance apparatus, wherein the first image information is analog signal information;
s2, carrying out hash coding on the collected first image information, converting the first image information into digital abstract data, and sending the digital abstract data file to digital timestamp service equipment;
s3, the digital timestamp service equipment receives the digital summary data file and adds a timestamp field;
s4, adding the receiving time and date information of the digital abstract data file into the time stamp field by the digital time stamp service equipment, and encrypting the digital abstract data file added with the time stamp;
s5, the digital timestamp service equipment sends the encrypted digital summary data file to the image display equipment;
s6, the image display device decrypts the encrypted digital summary data file to obtain second image information of the patient, wherein the second image information is digital signal information;
s7, restoring the nuclear magnetic resonance image of the patient and the time stamp information of the nuclear magnetic resonance image by the image display device based on the second image information of the patient;
and S8, the image display equipment establishes an index for the nuclear magnetic resonance image based on the time stamp information of the nuclear magnetic resonance image and stores the index.
2. The time stamp based nuclear magnetic resonance image acquisition processing method of claim 1, wherein the image display device stores the nuclear magnetic resonance images in order based on an index of the nuclear magnetic resonance images.
3. The method of claim 1, wherein the encrypting the time-stamped digital digest data file in S4 is performed using an ECC elliptic curve encryption algorithm.
4. The time-stamped mri image acquisition and processing method of claim 1 wherein the time-stamped digital digest data file is encrypted in step S4 using an RSA encryption algorithm.
5. The time stamp based nuclear magnetic resonance image acquisition processing method of any one of claims 1-4, further comprising:
when the nuclear magnetic resonance image of the patient is called, the nuclear magnetic resonance image of the patient is retrieved based on the index of the nuclear magnetic resonance image and is displayed through the display of the image display device.
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