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Six typical cases of image abnormalities to help you avoid the troubles of ultrasound probe image failures
Release time:
2025-03-12 09:41
Fault Phenomenon 1:
Image of a fault phenomenon where some array elements of the ultrasonic transducer are not completely damaged and there is poor contact inside the transducer, as shown in the figure below.
Fault Analysis and Cause:
The array element in the shaded area indicated by the arrow "1" in the figure shows attenuation but is not completely damaged. Such a situation can continue to be used, but it will also gradually become more severely damaged.
Fault Handling:
For the array crystal fault indicated by the arrow "2" in the figure, the repair solution is: First, find the problematic crystal, measure the supply voltage of each or each group of crystals, because the supply voltage of normal crystals or crystal groups is similar, but the problematic crystal shows a reduced supply voltage, thus finding the problematic crystal. Because there are many items to check, it is time-consuming and laborious. In addition, it should be added that similar fault images can also occur when the transducer and transducer board have poor contact. We can switch transducers and change transducer slots to distinguish them.
For the broken wire inside the transducer indicated by the arrow "3" in the figure, the repair solution is: Open the outer sheath, cut the overall shielding wire horizontally, bypass the broken wire, solder it, wrap it with transparent tape, measure whether it is conductive with a multimeter, and after it is conductive, connect the shielding of this wire and wrap it with tape. Only after the test is normal should the outermost overall shielding wire be soldered, and the outer sheath should be fixed with high-voltage power supply plastic tape.
Fault Phenomenon 2:
The fault image of some completely damaged array elements that do not vibrate or receive forms a tooth-like black area near the acoustic surface of the transducer. When multiple adjacent array crystals are damaged, an inverted triangle black area will also be formed.
It can be seen that the array crystals at the black area of the transducer are completely damaged. In actual use, these array elements will show different degrees of attenuation one after another. When unloaded, a dark channel similar to a single-channel receiving fault of the pulse board will appear in the near field, which will worsen during use and finally be completely damaged. The black area formed by the transducer array element fault does not have the spatial distribution regularity compared to the black area formed by the transducer board and pulse board faults.
Fault Handling:
This type of transducer fault has many crystals, and the repair difficulty is high. It is recommended to replace the entire array crystal module or replace the transducer. It should also be noted that similar fault images can also occur when the transducer and transducer board have poor contact. We can switch transducers and change transducer slots to distinguish them.
Fault Phenomenon 3:
Fault Analysis and Handling:
After the transducer bubbles, whether it is unloaded or imaging, there is a clear black area. By squeezing the protective layer on the surface of the transducer, the bubbles can move and change in the matching layer, and the black area in the image will also move and change.Fault Handling:
Repair solution for bubbles in the acoustic lens: Use liquid silicone rubber as the repair material for the transducer acoustic lens and the bonding material between the acoustic lens layer and the matching layer. Inject liquid silicone into the degumming area and expel the bubbles. Use gauze to tightly bind the transducer and place it for one day before loosening it. The fault disappears.
Fault Phenomenon 4:
Near the surface of the transducer in the oxidized slot, there are multiple dark stripes of varying widths, and the distribution does not have spatial regularity. There is a dark stripe composed of continuous dark stripes, whose width is 1/10 of the overall width of the transducer, and no inverted triangle black area is formed, showing the fault of slot oxidation.
Fault Analysis and Cause:
Since the dark stripes do not have spatial distribution regularity, channel faults can be basically ruled out. Therefore, the fault point is before the channel, that is, the channel from the transducer array element to the high-voltage switch on the transducer board and the array element switching. The related components between these two are relays, sockets, transducer sockets, transducer wires, and array elements. From the image itself, the most likely cause is the aging and attenuation fault of the transducer array element. In fact, after repeatedly plugging and unplugging the transducer, it was found that the dark stripes were reduced. After replacing the transducer socket, it was found that the nature and position of the dark stripes formed were different, so the possibility of aging and attenuation of the transducer array element can be ruled out.
Fault Handling:
It should be noted that because the electrical contact points of the transducer socket will have poor contact after a long time, oxidation will occur in a humid environment, causing the impedance to increase. Therefore, after plugging in the transducer, the returned echo is weakened. After repeatedly plugging and unplugging the transducer, the contact performance between the socket and the transducer is improved, and some dark stripes disappear.
Fault Phenomenon 5:
Active Interference
Fault Analysis and Cause:
When there is external interference in the site, press the gain key to the maximum, and you can see bursts of regular snowflakes or ripples of external interference. Repair solution for this fault: You can move the ultrasound machine to a place away from interference for testing. If there is no such interference, it proves that there is active interference.
Fault Handling:
Such active interference may come from nearby large radiation equipment, magnetic resonance, ultrasonic lithotripsy machines, high-voltage transformers, etc., or the equipment's dedicated ground wire may be cut off and lose its protective effect. It can be used in a better place, or the reliability of the ground wire can be re-checked at the original place, or a stable power supply from the next door can be used, and the power cord can be re-arranged.
There are 4 thin and long dark areas in the near field of the transducer channel board, and the display image after applying the coupling agent.
Fault Analysis and Cause:
The characteristic is that there are 4 notches near the acoustic lens of the transducer, similar to the fault image of partial transducer array element damage, but the notches have a regular spatial distribution. There are still obvious notches near the acoustic surface of the transducer, which seriously affects clinical use. If the image notches also move when the transducer is scanned obliquely, it is the channel board that is broken. If the image notches remain unchanged, it is the transducer array crystal damage.Fault Handling:
Repair solution for channel board failure at "1": Since each channel circuit board is universal, a typical machine has 36-48 channel boards. By sequentially moving and plugging in every four channel boards, the above fault images will move sequentially, and so on. This can identify which four channel boards are faulty, and then replace them. Repair solution for probe array crystal damage at "2": Refer to the troubleshooting in the above fault phenomenon 2.
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