3D Ultrasound Imgaing System Based On Back-end Scanning Mode

With the rapid development of electronic technology,3D-Ultrasound image has be-come the tendency of ultrasound imaging modality. Normally, the reconstruction of the3D-Ultrasound image is based on the3D reconstruction of2D ultrasound sequences. It iscomposed of three steps:2D image data acquisition,3D reconstruction of the2D data anddisplay of3D image. The first one is the most important step for accurate reconstructionof the3D-ultrasound image. There are many ways to obtain3D ultrasound image, whilethe biggest difference lies in the acquirement approaches of the2D image sequence, mainlyincluding mechanical scanning, free hand scanning and2D array probe.Mechanical scanning mode has the advantage of high resolution, controllable and easyto be realized. Based on mechanical scanning approach, this thesis presents a new scanningmode different from the traditional fan-shaped scanning and parallel scanning, namely: theback-end of the probe scanning while the probe’s front-end fixed on patients’ body surface.When the2D Ultrasound probe works under this scanning approach, it can avoid the block-ing effect caused by the occlusion of human ribs efficiently, so we can obtain the3D imagesof the organs under ribs. In order to realize the above scanning mode, we built a3D ul-trasound imaging system which including a ultrasound machine from GE company, a videocapture card from Daheng, stepper motor from Baolai, PC and so on. In order to evaluate thesystem qualitatively, we did some scanning experiments on fetus phantom using the aboveimaging system, then we got a high-resolution3D-image of the fetus, demonstrating the re-liability of system. In the following works, we took human organs as the scanning subjects,such as liver, kidney, or bladder, and acquired these3D images successfully. In addition, wedid another evaluation experiment, measuring agar phantoms’ volumes with regular cubicshapes, and compared with the true values. These errors are small, so our3D ultrasoundimaging system is meaningful to clinical application.The3D Ultrasound imaging system based on back-end scanning mode developed inthis thesis has the following advantages: simple structure, convenient operation, low-cost,high image quality. This imaging system has a great significance to3D ultrasound image’sclinical universality and application.