Ultrasonic imaging method and apparatus
View Patent ↗Disclosed is an ultrasonic imaging method. The method includes: on a basis of performing fuzzy segmentation of a membership function on an echo signal, sequentially dividing an input image into a plurality of fuzzy segments according to a strength of an echo; dividing the image into a plurality of layers accordingly; and performing a spatial neighborhood operation on a membership degree value in the plurality of layers, so as to obtain a space fuzzy segmentation array; in another aspect, determining a manipulated variable vector of the image according to image content-based self-adaptive calculation or user-based input, flexibly weighting and stretching space fuzzy segmentation arrays at the layers according to the manipulated variable vector finally, and adjusting and compounding the input image by using obtained echo increment and brightness compensation, so as to obtain a final output image. Also disclosed is a corresponding ultrasonic imaging apparatus.
1. An ultrasonic imaging method, comprising:
inputting an echo strength at a specified point of an input image, the echo strength being used as a function input, dividing the function input with a fuzzy membership degree according to p intervals divided on a basis of the echo strength, and obtaining a space fuzzy segmentation array V at the specified point, wherein V=[V 1 , V 2 , . . . , V p ], the values of V 1 , V 2 , . . . , V p are between 0 and 1, and V 1 +V 2 + . . . +V p ≈1;
determining a manipulated variable vector U for the specified point according to an input image content-based self-adaptive calculation or a user-based input, the manipulated variable vector U being sum of any combination of vectors selected from: local gain adjustment vector ULGA, high saturation suppression vector UHSS, low echo recovery vector ULER, and brightness equalization vector UBE, wherein ULGA=[ULGA 1 , ULGA 2 , . . . , ULGA p ], UHSS=[UHSS 1 , UHSS 2 , . . . , UHSS p ], ULER=[ULER 1 , ULER 2 , . . . , ULER p ], UBE=[UBE 1 , UBE 2 , . . . , UBE p ]; and
calculating an inner product according to the space fuzzy segmentation array V and the manipulated variable vector U to obtain echo increment ΔI at the specified point, adjusting the echo strength at the specified point with the echo increment ΔI, and taking the adjusted echo strength as an echo strength at a corresponding point in an output image, wherein ΔI=U T ·V, U T denotes a transposed matrix of U.
2. The ultrasonic imaging method of claim 1 , further comprising: performing a spatial neighborhood smooth operation after the step of dividing with the fuzzy membership degree, so that points of the input image adjacent in space divided into one interval having a large fuzzy membership degree, thereby obtaining the space fuzzy segmentation array V.
3. The ultrasonic imaging method of claim 1 , further comprising: dividing an image acquired after envelope extraction into subblocks before the step of dividing with the fuzzy membership degree, each sub-image obtained by subblocks being used as the input image.
4. The ultrasonic imaging method of claim 1 , further comprising: according to the local gain adjustment vector ULGA, the high saturation suppression vector UHSS, the low echo recovery vector ULER, the brightness equalization vector UBE and/or the echo increment ΔI, determining a brightness compensation ΔGainComp after the step of calculating an inner product to obtain echo increment ΔI at the specified point, and performing brightness correction on the output image with the brightness compensation ΔGainComp.
5. The ultrasonic imaging method of claim 1 , wherein the step of input image content-based adaptive calculation comprises any combination of steps from:
determining local gain ΔGain needed to be adjusted at the specified point to allow ULGA 1 =ULGA 2 = . . . =ULGA p =ΔGain, thereby obtaining the local gain adjustment vector ULGA; and
analyzing the input image to obtain distribution of echo signals, determining level of high saturation, and/or level of low echo loss, and/or level of brightness on a basis of the distribution, and according to each determined level, searching for a corresponding high saturation suppression vector UHSS, and/or low echo recovery vector ULER, and/or brightness equalization vector UBE.