Learn more. People with certain conditions or who have undergone chemotherapy or radiation may require a stem cell transplant. They can use a person's own stem…. An intravenous IV injection is a fast and accurate way of administering a medication. Learn more about IV injections here. Learn more about its uses and how it compares with saline solution here. A BNP test is a type of blood test that doctors sometimes use to help diagnose heart failure. Read on to find out more. How do ultrasound scans work?
Medically reviewed by Debra Rose Wilson, Ph. Concept Uses Safety An ultrasound scan uses high-frequency sound waves to create images of the inside of the body. Share on Pinterest Ultrasound scans are carried out by a sonographer. Share on Pinterest Ultrasound images are made from reflected sound, and a diagnosis can then be made.
Exposure to air pollutants may amplify risk for depression in healthy individuals. Costs associated with obesity may account for 3. Related Coverage. What you need to know about PRP. The researchers have successfully demonstrated the effectiveness of this technique in pigs and its possible use in humans. They are currently working on new methods to avoid inadvertent vessel damage during clot treatment, and to provide real-time imaging feedback to monitor the treatment.
This research could have a significant impact, since current conventional treatments for DVT involve drug therapy and sometimes invasive removal of the clots, which requires a several-day hospital stay, and may result in complications after treatment. In contrast, the non-invasive histotripsy technique is 50 times faster than the current technique, does not require drugs or external agents, and if successful, could be used as an outpatient procedure. How does it work? What is ultrasound used for?
Are there risks? What is medical ultrasound? Diagnostic ultrasound is a non-invasive diagnostic technique used to image inside the body. Ultrasound probes, called transducers, produce sound waves that have frequencies above the threshold of human hearing above 20KHz , but most transducers in current use operate at much higher frequencies in the megahertz MHz range.
Most diagnostic ultrasound probes are placed on the skin. However, to optimize image quality, probes may be placed inside the body via the gastrointestinal tract, vagina, or blood vessels. In addition, ultrasound is sometimes used during surgery by placing a sterile probe into the area being operated on.
Source: Terese Winslow Ultrasound waves are produced by a transducer, which can both emit ultrasound waves, as well as detect the ultrasound echoes reflected back. An ultrasound transducer. The ultrasound probe transducer is placed over the carotid artery top. A color ultrasound image bottom, left shows blood flow the red color in the image in the carotid artery.
Waveform image bottom right shows the sound of flowing blood in the carotid artery. Click here to watch video Ultrasound color Doppler shows a clot blocking blood flow in a pig. Source: Zhen Xu, Ph. Source: Zhehn Xu, Ph. In that way, the crystals transform the electrical energy that is supplied to them into ultrasounds 2. To make a diagnosis using this method, the ultrasound machine must be used. This machine is composed by: a transducer, a computer, a monitor, a storage unit, a keyboard and controls 1.
The transducer emits the ultrasounds and receives echoes from them. The computer processes and transforms the electrical signals that it receives from the transducer into images.
Besides, the controls modify the characteristics of the emitted ultrasounds, for example: the frequency. Depending on the differences of the physical properties mainly the density between the tissues the waves penetrate, they will be reflected in a different proportion, returning the echoes to the transducer.
Thank you for registering with Physics World If you'd like to change your details at any time, please visit My account. The first ultrasound imaging device that converts acoustic signals directly into light has been created by Hyeonggeun Yu and colleagues at North Carolina State University in the US.
The device was fabricated by depositing an organic LED onto a piezoelectric crystal and it can produce real-time images without the need for signal processing.
This approach could significantly reduce the costs of advanced ultrasound imaging techniques, making them far more accessible in applications including engineering and medicine. Ultrasound is an increasingly popular technique for imaging the interiors of objects — animate and inanimate. It works by transmitting sound waves into an object using a piezoelectric transducer, then using the same transducer to pick up sound reflected from structures within the object.
The resulting voltages in the transducer are then converted into electrical signals, from which images can be reconstructed by a computer. Since ultrasound achieves low-cost, real-time imaging without the need for powerful magnets or ionizing radiation, it offers significant advantages over approaches such as magnetic resonance imaging and X-ray scans.
Recently, improvements to ultrasound technology have replaced single, moveable transducers with large arrays of more than 10, devices, allowing for scans with far higher resolutions and image-production speeds.
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