CN102662151B - Method for compressing and decoding magnetic resonance imaging pulse sequence information - Google Patents
Method for compressing and decoding magnetic resonance imaging pulse sequence information Download PDFInfo
- Publication number
- CN102662151B CN102662151B CN201210172032.0A CN201210172032A CN102662151B CN 102662151 B CN102662151 B CN 102662151B CN 201210172032 A CN201210172032 A CN 201210172032A CN 102662151 B CN102662151 B CN 102662151B
- Authority
- CN
- China
- Prior art keywords
- index
- pulse sequence
- pulse
- sequence information
- coding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention discloses a method for compressing and decoding magnetic resonance imaging pulse sequence information. The method includes: before scanning is started, segmenting the pulse sequence information by a spectrometer computer according to shared information and non-shared information, performing code indexing for the information in each segment and writing an indexed code sequence and information corresponding to indexed codes into a pulse sequence generator; and after scanning is started, using the pulse sequence generator to search the corresponding information according to the indexed codes and then to output updating. By the aid of the method, pulse sequence information quantity can be effectively compressed, and pressure of the pulse sequence generator on data storage capacity, data transmission speed and the like can be reduced.
Description
Technical field
The present invention relates to mr imaging technique field, be specifically related to a kind of method that magnetic resonance imaging pulse sequence information is compressed and decoded.
Background technology
In magnetic resonance imaging spectrometer, pulse-series generator is one of core component, for generation of the required pulse train of magnetic resonance imaging, controls other unit (comprising transmitter, receiver and the gradient waveform generator etc.) collaborative work in spectrometer.
Along with the development of mr imaging technique, the pulse train in practical application becomes increasingly complex.Therefore,, in Polaroid overall process, need the time sequence information amount of pulse-series generator processing increasing.Adopt prior art (CN 1361419A; ZL 03150591.0) pulse-series generator of design expands and the aspect such as data rate lifting has run into bottleneck at data storage capacity.For a part of formation method, Polaroid overall process can be divided into multiple release time of TR, therefore can utilize the stand-by period D in TR
0, transmit pulse sequence information required in next TR to pulse-series generator.But, for example, in short TR formation method (T1 weighted imaging), due to D
0very short (being even 0), therefore has little time to transmit pulse sequence information required in next TR.And in other formation methods, all data acquisitions complete in a TR.While adopting these methods to carry out magnetic resonance imaging, need to be by needed imaging whole pulse sequence information write pulse sequencers before sweep start.For example, for some complicated formation methods (three-dimensional blood vessel imaging), Polaroid required whole pulse sequence quantity of information are very large.If employing such scheme, the memory capacity of pulse-series generator is difficult to support so a large amount of information.Even if memory capacity can support, transferring large number of data also can cause sweep start variable length delay.In the practical applications such as blood vessel imaging, need to use contrast preparation, and sweep start variable length delay can cause the enhancing deleterious of contrast preparation, affect the contrast of magnetic resonance image (MRI).
Summary of the invention
The object of the invention is to provide for the deficiencies in the prior art a kind of compresses and the method for decoding magnetic resonance imaging pulse sequence information.The method is before sweep start, by spectrometer computing machine, pulse sequence information is carried out to segmentation according to shared information and non-shared information, then each segment information is carried out to index coding, then by indexing coding sequence and the index corresponding information write pulse sequencer of encoding.After sweep start, by the pulse-series generator information corresponding according to index coding lookup, then upgrade output.
The object of the present invention is achieved like this:
Magnetic resonance imaging pulse sequence information is compressed and a method of decoding, and the method comprises following concrete steps:
1) on spectrometer computing machine, Polaroid required whole pulse sequence information to be divided by joint, each joint is for gathering the required pulse sequence information of a line K spatial data.
2) respectively save pulse sequence information, find out the shared message segment of each joint, and these shared message segments are carried out to index coding; Non-shared message segment in each joint pulse sequence information is carried out to index coding.
3) with the whole pulse sequence information of all index coded representations, generating indexes coded sequence.
4) before sweep start, indexing coding sequence and each index are encoded in the internal memory of corresponding message segment write pulse sequencer, and by first index coding in memory pointers indexing coding sequence.
5), after pulse-series generator receives the scan start signal from spectrometer computing machine, carry out decode procedure by the logic control element in pulse-series generator.Specifically comprise the following steps:
A) index that reads the current indication of internal memory pointer is encoded, and then performs step b;
If b) index of the current indication of internal memory pointer coding is pulse sequence end mark, perform step f; Otherwise execution step c;
C) index point is pointed to encode first data of corresponding message segment of index, then perform step d;
If d) data of the current indication of index point are message segment end marks,, by next memory pointers index coding, then perform step a; Otherwise execution step e;
E) output state of the Data Update pulse-series generator of the current indication of index of reference pointer, and index point is pointed to next data, then perform step d;
F) pulse sequence finishes.
The invention has the beneficial effects as follows: in magnetic resonance imaging, gather the required pulse sequence information of each row K spatial data normally identical or part identical.Adopt the present invention's compression pulse time sequence information amount effectively, alleviate the pressure of pulse-series generator at the aspect such as data storage capacity and data rate.
Brief description of the drawings
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the process flow diagram of decode procedure of the present invention;
Fig. 3 is the embodiment of the present invention 1 schematic diagram;
Fig. 4 is the embodiment of the present invention 2 schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, feature of the present invention and other correlated characteristic are further elaborated.
Embodiment 1
Consult Fig. 1 and Fig. 2, " magnetic resonance imaging pulse sequence information is compressed and the method for decoding " of the present invention comprises the following steps:
1, on spectrometer computing machine, Polaroid required whole pulse sequence information to be divided by joint, each joint is for gathering the required pulse sequence information of a line K spatial data.
2, respectively save pulse sequence information, find out the shared message segment of each joint, and these shared message segments are carried out to index coding; Non-shared message segment in each joint pulse sequence information is carried out to index coding.
3, with the whole pulse sequence information of all index coded representations, generating indexes coded sequence.
4, before sweep start, indexing coding sequence and each index are encoded in the internal memory of corresponding message segment write pulse sequencer, and by first index coding in memory pointers indexing coding sequence.
5,, after pulse-series generator receives the scan start signal from spectrometer computing machine, carry out decode procedure by the logic control element in pulse-series generator.Specifically comprise the following steps:
A) index that reads the current indication of internal memory pointer is encoded, and then performs step b.
If b) index of the current indication of internal memory pointer coding is pulse sequence end mark, perform step f; Otherwise execution step c.
C) index point is pointed to encode first data of corresponding message segment of index, then perform step d.
If d) data of the current indication of index point are message segment end marks,, by next memory pointers index coding, then perform step a; Otherwise execution step e.
E) output state of the Data Update pulse-series generator of the current indication of index of reference pointer, and index point is pointed to next data, then perform step d.
F) pulse sequence finishes.
Consult Fig. 3, taking 2D_mSE sequence as example, in scanning process, gather the required pulse sequence information of every a line K spatial data identical.Therefore, the required whole pulse sequence information of imaging can be divided into N joint,
, wherein SN is the number of plies, NPE is phase encoding number.In Fig. 3, the index of pulse sequence is encoded to { 00000001}.The required whole pulse sequence information of imaging are as follows:
And indexing coding sequence is
.Before sweep start, the data in the internal memory of write pulse sequencer are as follows:
Wherein, { 00000000} is pulse sequence end mark, and { 0,0} is message segment end mark.
Embodiment 2
Consult Fig. 4, taking 2D_mFSE sequence as example, in scanning process, gather the required pulse sequence message part of every a line K spatial data identical (the corresponding part of pulse sequence 00000010 in Fig. 4).Therefore, the required whole pulse sequence information of imaging can be divided into N joint,
, wherein SN is the number of plies, and NPE is phase encoding number, and ETL is echo train legth.In Fig. 4, the index of pulse sequence is encoded to { 00000001} and { 00000010}.The required whole pulse sequence information of imaging are as follows:
And indexing coding sequence is as follows:
Before sweep start, the data in the internal memory of write pulse sequencer are as follows:
Wherein, { 00000000} is pulse sequence end mark, and { 0,0} is message segment end mark.
Claims (1)
1. magnetic resonance imaging pulse sequence information is compressed and a method of decoding, be it is characterized in that the method comprises following concrete steps:
I, on spectrometer computing machine, Polaroid required whole pulse sequence information are divided by joint, each joint is for gathering a line K spatial data required pulse sequence information;
II, respectively save pulse sequence information, find out the shared message segment of each joint, and these shared message segments are carried out to index coding; Non-shared message segment in each joint pulse sequence information is carried out to index coding;
III, with the whole pulse sequence information of all index coded representations, generating indexes coded sequence;
IV, before sweep start, indexing coding sequence and each index are encoded in the internal memory of corresponding message segment write pulse sequencer, and by first index coding in memory pointers indexing coding sequence;
After V, pulse-series generator receive the scan start signal from spectrometer computing machine, carry out decode procedure by the logic control element in pulse-series generator; Specifically comprise:
A, read the index coding of the current indication of internal memory pointer, then perform step b;
If the index of the current indication of b internal memory pointer coding is pulse sequence end mark, perform step f; Otherwise execution step c;
C, index point is pointed to encode first data of corresponding message segment of index, then perform step d;
If the data of the current indication of d index point are message segment end marks,, by next memory pointers index coding, then perform step a; Otherwise execution step e;
The output state of the Data Update pulse-series generator of e, the current indication of index of reference pointer, and index point is pointed to next data, then perform step d;
F, pulse sequence finish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210172032.0A CN102662151B (en) | 2012-05-30 | 2012-05-30 | Method for compressing and decoding magnetic resonance imaging pulse sequence information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210172032.0A CN102662151B (en) | 2012-05-30 | 2012-05-30 | Method for compressing and decoding magnetic resonance imaging pulse sequence information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102662151A CN102662151A (en) | 2012-09-12 |
| CN102662151B true CN102662151B (en) | 2014-06-25 |
Family
ID=46771680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210172032.0A Active CN102662151B (en) | 2012-05-30 | 2012-05-30 | Method for compressing and decoding magnetic resonance imaging pulse sequence information |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102662151B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291418B (en) * | 2016-07-19 | 2018-12-14 | 华东师范大学 | A method of improving magnetic resonance imaging pulse sequencer output speed |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4251763B2 (en) * | 2000-08-11 | 2009-04-08 | 株式会社日立メディコ | Magnetic resonance imaging system |
-
2012
- 2012-05-30 CN CN201210172032.0A patent/CN102662151B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102662151A (en) | 2012-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Snavely et al. | Skeletal graphs for efficient structure from motion | |
| CN104714199B (en) | A kind of MR imaging method and device | |
| CN105611295B (en) | A kind of system and method for realizing video sampling and compressing transmission on SOC | |
| CN107770524A (en) | A kind of video coding-decoding processing method and device | |
| JP7127137B2 (en) | Encoding method, decoding method and apparatus | |
| CN102258370A (en) | Magnetic resonance imaging apparatus | |
| CN102436465A (en) | Telemetry data compression storage and rapid query method of ontrack spacecraft | |
| CN105247382A (en) | Magnetic resonance imaging system with ghost artifact reduction and method of operation thereof | |
| EP3657801A1 (en) | Methods for encoding/decoding camera parameter information and devices corresponding thereto | |
| CN102662151B (en) | Method for compressing and decoding magnetic resonance imaging pulse sequence information | |
| CN105874774B (en) | For keeping the count table holding meanss of count table and the keeping method of correlation in the processing procedure of frame | |
| CN111666508A (en) | Method and device for extracting detailed addresses corresponding to longitude and latitude | |
| CN103036572A (en) | Decoder and decoding method for two speed resolver | |
| CN112580368B (en) | Method, device, equipment and storage medium for identifying intention sequence of conversation text | |
| CN109308275B (en) | System and method for converting orthogonal coding pulse | |
| CN106873905B (en) | The method, apparatus and solid state hard disk of data storage | |
| CN109035351A (en) | A kind of image object boundary expression based on side chain code | |
| CN105163128A (en) | Screen image acquisition method for accelerating image conversion in parallel by GPU (Graphics Processing Unit) | |
| US3434113A (en) | Methods and systems for providing graphical displays | |
| CN116433686A (en) | Medical image segmentation method and related equipment based on transform context information fusion | |
| CN102778645B (en) | JTAG (joint test action group) main controller and realization method of JTAG main controller | |
| CN201918981U (en) | Dual-phase harvard code bus signal coding-decoding circuit | |
| CN104284189A (en) | Improved BWT data compression method and hardware implementing system thereof | |
| CN106291418A (en) | A kind of method improving magnetic resonance imaging pulse sequencer output speed | |
| CN111103562B (en) | Reconstruction method and device for simultaneously imaging multiple slice layers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200241 No. 500, Dongchuan Road, Shanghai, Minhang District Patentee after: EAST CHINA NORMAL University Patentee after: SHANGHAI KANGDA COLORFUL MEDICAL TECHNOLOGY Co.,Ltd. Address before: 200241 No. 500, Dongchuan Road, Shanghai, Minhang District Patentee before: EAST CHINA NORMAL University Patentee before: SHANGHAI COLORFUL MAGNETIC RESONANCE TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |