2born (2born) wrote,
2born
2born

МРТ для зубьев

Simultaneous imaging of hard and soft biological tissues in a low-field dental MRI scanner: https://arxiv.org/abs/2005.01462

Magnetic Resonance Imaging (MRI) of hard biological tissues is challenging due to the fleeting lifetime and low strength of their response to resonant stimuli, especially at low magnetic fields. Consequently, the impact of MRI on some medical applications, such as dentistry, continues to be limited. Here, we present three-dimensional reconstructions of ex-vivo human teeth, as well as a rabbit head and part of a cow femur, all obtained at a field strength of only 260 mT. These images are the first featuring soft and hard tissues simultaneously at sub-Tesla fields, and they have been acquired in a home-made, special-purpose, pre-medical MRI scanner designed with the goal of demonstrating dental imaging at low field settings. We encode spatial information with two variations of zero-echo time (ZTE) pulse sequences: Pointwise-Encoding Time reduction with Radial Acquisition (PETRA) and a new sequence we have called Double Radial Non-Stop Spin Echo (DRaNSSE), which we find to perform better than the former. For image reconstruction we employ Algebraic Reconstruction Techniques (ART) as well as standard Fourier methods. A noise analysis of the resulting images shows that ART reconstructions exhibit a higher signal to noise ratio with a more homogeneous noise distribution.
Comments: 12 pages, comments welcome
Tags: медицинская физика, разгребая arXiv'ы, техника
Subscribe

  • Ондатровые хроники

    В роли пятничных котиков сегодня опять будут ондатры. Мы расстались с ними 23 июня, когда наблюдали их великое переселение. С тех пор жизнь у них…

  • Сон в руку, или Едят ли синички макароны?

    Просто два факта:))) 1. Сегодня ночью мне приснились макароны-ракушки, разогретые на сковородке с поджаренным на оливковом масле луком. 2. На…

  • Курята растут

    Вот подросшая курочка из этой семьи. Жаль, что освещение было никакое, так что приношу извинения за качество, но зафиксировать для истории было…

  • Post a new comment

    Error

    default userpic

    Your reply will be screened

    Your IP address will be recorded 

    When you submit the form an invisible reCAPTCHA check will be performed.
    You must follow the Privacy Policy and Google Terms of use.
  • 0 comments