Shear waves travel faster through stiffer tissue than through softer tissue. Ultrasound uses sound waves with frequencies higher than what humans can hear, and works by sending "shear waves" through us - the sort of waves that occur when you whip a rope up and down quickly. The scientists published their results in March in the journal Applied Physics Express.Īlthough previous studies have suggested such x-ray elastography is possible in principle, this is the first time that any real-world visualization of stiffness using the concept has been demonstrated. This greater resolution for the field of elastography - a non-invasive method of medical imaging that investigates the stiffness and elasticity of soft tissue - should allow healthcare professionals to identify much smaller and deeper tissue problems, such as lesions, than they can with ultrasound or MRI, the two main types of elastography used currently. Researchers in Japan have figured out a way to use x-rays to tell doctors about those squishy parts as well, not just bones, in a similar way to how ultrasound or magnetic resonance imaging (MRI) work - but with much greater resolution.
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