What is the difference between B-ultrasound and B-ultrasound used in pig farms?

In our country, veterinary A-ultrasonic diagnostic instrument (referred to as veterinary A-ultrasound) is used to measure pig back fat in vivo. Later, it was gradually replaced by veterinary B-ultrasound diagnostic instrument (referred to as veterinary B-ultrasound). So far, the accuracy of measuring pig back fat thickness with A-ultrasound and B-ultrasound for animals is summarized as follows after years of accumulation.

First, the area that can be measured can only be measured by A-ultrasound for animals, and B-ultrasound for animals can be measured in a certain range and display images.

Secondly, the number of time-sensitive crystals in the probe. The veterinary A-ultrasound only uses one time-sensitive crystal, and the veterinary B-ultrasound assembles multiple time-sensitive crystals in the probe, the length of which is about15-18 cm.

Third, the image formed by animals on the screen with B-ultrasound, and the image formed by animals on the screen with A-ultrasound is only a waveform. B-ultrasound forms a real-time image with high resolution; Fourthly, the measurement error, due to the different measurement principles, affects the results of A-mode, such as the determination of measurement points, the placement angle of probes, and the reading of data on the screen. The veterinary B-ultrasound is easier to determine than veterinary A in the above aspects, thus greatly reducing people's subjective judgment. However, veterinary B-ultrasound also needs professional technical training to identify ultrasonic images. When measuring veterinary B-ultrasound images, it is necessary to well identify the representative tissue structure presented in the images. Fifth, the price of veterinary B-ultrasound is much higher than that of veterinary B-ultrasound. Measuring the back fat with B-ultrasound or A-ultrasound is an essential process in pig farms, because the minimum weight of breeding pigs currently sold is 50 kg, and the weight of breeding pigs measured in the field should reach at least 75 kg. The premature sale of breeding pigs reduces the selection intensity and affects the selection progress. Therefore, the measurement of back fat thickness can reduce the negative impact of premature sales of breeding pigs on breeding. Therefore, it is very necessary to accurately determine the back fat of breeding pigs.

Operation method of veterinary B-ultrasound in detecting pigs;

1. Baoding: Sows generally don't need Baoding, as long as they keep quiet. It is more convenient to detect sows in the limit bar if conditions permit. It is best to lie on your side, stand quietly, lie down or eat.

2. Exploration site: In vitro exploration is generally around the lower abdomen and the upper part of the breast before the posterior rib, starting from the upper part of the last pair of breasts, gradually moving forward with pregnancy, and finally reaching the rear end of the rib. Pigs' fur is scarce, so it is not necessary to cut their hair during exploration, but the exploration site should be kept clean, so as not to affect the clarity of B-ultrasound images. When probing the body surface, the contact between the probe and pigskin must be covered with lotus root mixture. In the case of rectal examination, no coupling agent is needed.

3. Exploration method: During in vitro exploration, the probe is close to the abdominal wall. During the first trimester, the probe is inclined to the front of pubic bone, pelvic entrance, or at a 45-degree angle with the upper side of the opposite side. The probe is close to the skin, and it scans in a fan-shaped way from front to back, up and down, with slow movement. The embryo in the first trimester is very small, so it should be scanned carefully and slowly. Do not slide the probe over the skin and scan quickly. (The method of exploration can be flexibly used according to the actual situation, and the situation in the uterus can be explored. When the pig bladder is filled with urine and expands, blocking the uterus, so that the uterus can not be cleaned or only part of the uterus can be detected, it should be tested after the pig urinates.

Xuzhou Dawei veterinary ultrasonic machine DW-S630；;

First-class digital imaging technology makes the image clearer.

Display size: 6.5-inch LCD screen.

Display magnification: ×0.8, × 1.0, × 1.2, × 1.5, × 1.8, × 2.0; ×0.8 and×1.0 can improve the depth display.

Local amplification: local amplification can be doubled in real time.

Dynamic range: 0 ~ 120B adjustable.

Focusing: Dynamic digital electrons focus point by point.

Pretreatment: variable aperture, dynamic apodization, dynamic digital filtering, etc.

Post-processing: gamma correction, line correlation, frame correlation, point-line correlation, linear interpolation, digital spatio-temporal filtering, digital edge enhancement and pseudo-color processing.

Frequency conversion: There are five kinds of frequency conversion reception: 2.5 MHz/3.0 MHz/3.5 MHz/4.0 MHz/5.0 MHz;

Image polarity: Flip left/right, Flip up/down.

Movie storage: 256 consecutive pictures are stored circularly when displayed in real time.

Scope of application:

Examination during embryo transfer;

Identification of pigs, horses and other animals;

Measurement of poultry muscle thickness and area;

Diagnosis of reproductive system diseases such as uterus and ovary; ?

Pregnancy diagnosis, fetal development, fetal vitality and gender identification;

Examine tumors, abscesses and hematomas on the surface of various animals' breasts;

Determination of back fat thickness, hip fat thickness, waist muscle area and muscle mass of cattle, sheep, horses, pigs and camels. ?

Technical parameters of phantom

The sound velocity of TM material:154010m/s (23 3℃);

The sound attenuation coefficient of TM material: 0.70 0.05 dB/cm/MHz (23 3℃);

Diameter of nylon target line: 0.3±0.05mm；; ;

Tolerance of nylon target line: 0.1mm.

Optional parts:

6.5MHZ/R 13 micro-convex probe

7.5 MHz /L40 linear array probe.