CN1952922A - A new logarithmic compression method based on digital ultrasound diagnostic apparatus - Google Patents
A new logarithmic compression method based on digital ultrasound diagnostic apparatus Download PDFInfo
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- CN1952922A CN1952922A CN 200610097876 CN200610097876A CN1952922A CN 1952922 A CN1952922 A CN 1952922A CN 200610097876 CN200610097876 CN 200610097876 CN 200610097876 A CN200610097876 A CN 200610097876A CN 1952922 A CN1952922 A CN 1952922A
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Abstract
This invention discloses a new log compression method based on digital supersonic dialogue device in log compression technique, which comprises three parts: integral accurate computation part, decimal approximate computation part and input and output part; wherein, due to hardware digital signal as two bit, it adopts 2 as bottom for log computation with signal total range as 0<=D<2N-1, n psi(0,N-1); when the signal D meets 2n<=D<2n+1 then integral part as n and decimal part uses (D-2n)/2n; Through multiple section line for approximate plug computation to get decimal part p; processing selectively output according to the needs of dynamic range and signal proportion.
Description
Technical field
The present invention relates to a kind of log-compressed technology, specifically is a kind of a kind of new log-compressed method based on digital ultrasound diagnostic apparatus.Be easy to adjust, the log-compressed technology of being convenient to control is applied to the medical ultrasonic equipment field.
Background technology
Log-compressed is an important link during ultrasonic signal is handled, because the dynamic range of ultrasound echo signal is more than 50dB, and the general displayable dynamic range of CRT monitor has only 20～30dB.For echoed signal is shown by display, signal need be compressed.The quality of log-compressed directly influences the effect of image.
In simulation B ultrasonic diagnostic equipment, substantially all use logarithmizer and realize.And in digital ultrasound diagnostic apparatus, owing to realize relatively difficulty of log-compressed computing with hardware, so look-up table becomes the first-selection of present ultrasonic producer, this method has been the method for known solution log-compressed.The implementation of look-up table has two kinds: a kind of is the EAB resource construction form that utilizes FPGA inside; A kind of is plug-in memory chip stores form.The shortcoming of first method is exactly that the EAB resource is very limited, if require the signal of collection very abundant, just needs with very big bit wide, and very big bit wide might make the EAB resource not enough.If reduce the digital signal bit wide for satisfying the EAB resource, can influence quality of signals so, resulting picture quality can descend.And the diagnostic equipment needs is exactly the preferable image quality.If the EAB resource is enough, but a large amount of redundant data of storage also is a kind of waste of resource in table.Present miniaturization of electronic products, low energy consumption, good Electro Magnetic Compatibility all is trend of the times, the limitation of second method just shows especially out so.
Summary of the invention
The objective of the invention is for overcoming the shortcoming of said method, a kind of a kind of new log-compressed method based on digital ultrasound diagnostic apparatus is provided.It is easy to adjust, and is convenient to control, is applicable to the medical ultrasonic equipment field.
The present invention adopts following technical scheme: realize log-compressed with projectional technique, in the inner realization of FPGA, concrete grammar is: based on a kind of new log-compressed method of digital ultrasound diagnostic apparatus, divide three parts to realize: the accurate arithmetic section of integer, decimal operate approximately part and input, output control part, based on digital signal in the hardware is scale-of-two, so adopt 2 to be the logarithm operation at the end, the signal total size is 0≤D＜2
N-1, and n ∈ (0, N-1), when signal D satisfies 2
n≤ D＜2
N+1, then integral part is n, fraction part utilization (D-2
n)/2
n, be similar to interpolation calculation by the multistage straight line, obtain fraction part p, result of calculation requires selectively to export according to concrete dynamic range and signal to noise ratio (S/N ratio); In the formula: D representation signal data, N representative
Advantage of the present invention is: realize log-compressed with projectional technique, in the inner realization of FPGA, it is few to take hardware resource, and travelling speed is fast, and ratio of precision is higher, the convenient rewriting and control.Utilization is based on the log-compressed of algorithm, the width for the treatment of packed data is no longer responsive, convenient rewriting and control, under the prerequisite that guarantees precision, saved the needed plug-in chip of look-up table, reduced the area of pcb board, reduced cost and energy consumption, also be highly significant to the EMC Design of circuit board level, thereby help the miniaturization of product.
Description of drawings
The present invention is described in more detail below in conjunction with drawings and Examples.
Fig. 1 is existing diasonograph theory diagram;
Fig. 2 is linear output map.
Embodiment
As shown in Figure 1, the log-compressed based on algorithm is realized by three parts: the accurate arithmetic section of integer, decimal operate approximately part and input, output control part.Because digital signal is the logarithm operation at the end by binary representation so adopt with 2 in the hardware.If the signal total size is 0≤D＜2
N-1, and n ∈ (0, N-1).When signal D satisfies 2
n≤ D＜2
N+1, then integral part is n, fraction part utilization (D-2
n)/2
n, be similar to interpolation calculation by the multistage straight line, obtain fraction part p, result calculated and actual operation value differ seldom, can ignore in diasonograph is used.Such result of calculation can't directly be exported.Also to require selectively to export according to concrete dynamic range and signal to noise ratio (S/N ratio).Thereby reach better compression effectiveness.
Actual requirement is carried out logarithm and is amplified in certain dynamic range, wish that when small-signal signal to noise ratio (S/N ratio) does not reduce, and requires linear transmission.So the curve that requires as shown in Figure 2: linear amplification section and logarithm amplify section.Realize that such output finished by output control.Supposing to satisfy optimum signal-noise ratio flex point data is D0, and then output control is judged the data of input just as one gate, if less than D0 then carry out linear amplification output, if greater than D0 then the logarithm result who calculates is above carried out exporting after the suitable computing.
Utilization is based on the log-compressed of algorithm, and is right
Data to be compressedWidth no longer responsive, convenient rewriting and control have been saved the needed plug-in chip of look-up table under the prerequisite that guarantees precision, reduced the area of pcb board, reduced cost and energy consumption, also be highly significant to the EMC Design of circuit board level, thereby help the miniaturization of product.
Claims (1)
1, based on a kind of new log-compressed method of digital ultrasound diagnostic apparatus, it is characterized in that inner realization at FPGA, divide three parts: the accurate arithmetic section of integer, decimal operate approximately part and input, output control part; Based on digital signal in the hardware is scale-of-two, so employing is the logarithm operation at the end with 2, the signal total size is 0≤D＜2
N-1, and n ∈ (0, N-1), when signal D satisfies 2
n≤ D＜2
N+1, then integral part is n, fraction part utilization (D-2
n)/2
n, be similar to interpolation calculation by the multistage straight line, obtain fraction part p, result of calculation requires selectively to export according to concrete dynamic range and signal to noise ratio (S/N ratio); In the formula: D representation signal data, N represents index.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610097876 CN1952922A (en) | 2006-11-17 | 2006-11-17 | A new logarithmic compression method based on digital ultrasound diagnostic apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610097876 CN1952922A (en) | 2006-11-17 | 2006-11-17 | A new logarithmic compression method based on digital ultrasound diagnostic apparatus |
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| CN1952922A true CN1952922A (en) | 2007-04-25 |
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| CN 200610097876 Pending CN1952922A (en) | 2006-11-17 | 2006-11-17 | A new logarithmic compression method based on digital ultrasound diagnostic apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101494448B (en) * | 2008-01-22 | 2011-06-08 | 中国医学科学院生物医学工程研究所 | Serial self-adapting noise elimination module based on FPGA design |
| CN104306027A (en) * | 2014-11-21 | 2015-01-28 | 中国医学科学院生物医学工程研究所 | Medical ultrasonic diagnostic instrument real-time logarithmic compression circuit establishment method based on FPGA |
| CN110840483A (en) * | 2019-11-15 | 2020-02-28 | 徐州市凯信电子设备有限公司 | Real-time logarithmic compression method and system for digital ultrasonic diagnostic apparatus |
| WO2022087781A1 (en) * | 2020-10-26 | 2022-05-05 | 京东方科技集团股份有限公司 | Signal processing method, readable storage medium and ultrasound imaging system |
-
2006
- 2006-11-17 CN CN 200610097876 patent/CN1952922A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101494448B (en) * | 2008-01-22 | 2011-06-08 | 中国医学科学院生物医学工程研究所 | Serial self-adapting noise elimination module based on FPGA design |
| CN104306027A (en) * | 2014-11-21 | 2015-01-28 | 中国医学科学院生物医学工程研究所 | Medical ultrasonic diagnostic instrument real-time logarithmic compression circuit establishment method based on FPGA |
| CN110840483A (en) * | 2019-11-15 | 2020-02-28 | 徐州市凯信电子设备有限公司 | Real-time logarithmic compression method and system for digital ultrasonic diagnostic apparatus |
| CN110840483B (en) * | 2019-11-15 | 2022-03-18 | 徐州市凯信电子设备有限公司 | Real-time logarithmic compression method and system for digital ultrasonic diagnostic apparatus |
| WO2022087781A1 (en) * | 2020-10-26 | 2022-05-05 | 京东方科技集团股份有限公司 | Signal processing method, readable storage medium and ultrasound imaging system |
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