Contrast-enhanced Ultrasound Technique For Piercing Needle

In addition to conventional contrast harmonic imaging, there are also intermittent ultrasound imaging, energy contrast harmonic imaging, back pulse harmonic imaging, stimulated acoustic emission imaging, low mechanical index imaging, contrast agent burst imaging and other methods. No matter what method is used, an ultrasound device capable of angiography must have sufficient bandwidth, high dynamic range, and be able to provide sufficient parameters, such as: imaging time, MI sound intensity, and real-time dynamic hard disk storage function.

1) Contrast agent puncture needle breaking imaging method When the first generation of contrast agent is used, in order to observe the distribution information of contrast agent in blood vessels and organs and tissues, the way of bursting microbubbles is usually used to obtain rich harmonics. The images of myocardial perfusion can be obtained by contrast harmonic imaging with cardiac wave triggering. When it comes to abdominal organs such as liver, manual trigger is used to obtain the time-phase image of tumor perfusion with contrast agent.

2) Low mechanical index imaging When a emitted ultrasound is used and its mechanical index MI is lower than 0.15, it is called low mechanical index. Imaging with this ultrasonic energy lower than the energy at which the microbubble is broken is called low-mechanical index imaging. This method can realize continuous harmonic imaging of blood flow and reduce the interference of tissue harmonics. The technique uses a second generation contrast agent.