1 / 70

Fundamentals of N uclear M agnetic R esonance

Fundamentals of N uclear M agnetic R esonance. Introduction. Nuclear Magnetic Resonance ( NMR ) : discovered by F. Block and E. Purcell in 1946 Standard spectroscopic technique NMR Imaging : P. Lauterbur(1973), P. Mansfield (1973), and R. Damadian(1971). Angular Momentum ：. Type ：

marsden-duffy
Télécharger la présentation

Fundamentals of N uclear M agnetic R esonance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fundamentals of Nuclear Magnetic Resonance

  2. Introduction • Nuclear Magnetic Resonance (NMR) : discovered by F. Block and E. Purcell in 1946 • Standard spectroscopic technique • NMR Imaging : P. Lauterbur(1973), P. Mansfield (1973), and R. Damadian(1971).

  3. Angular Momentum： • Type： • Orbital • Spin • Nuclear spin；I • The spin of unpaired neutrons or protons. • I = 0；nuclei with even numbers of protons and neutron. • I = ± (1/2)n（ n is an integer ）； Net nuclear angular momentum La：angular momentum m：mass v：velocity

  4. 體內各核種的相對靈敏度

  5. 磁偶極矩(Magnetic Dipole Moment) • 磁偶極矩(磁矩；M) • 質子自旋產生磁矩 r : 旋磁比(gryomagnetic ratio) I : 核自旋(nuclear spin) • 1H、13C、19F、23Na、31P

  6. Larmor equation • Larmor frequency：ω • 1.5 Tesla下氫原子核的旋進頻率為 63.866MHz

  7. T1 curve

  8. T2 decay curve

  9. Image Characteristics • SNR • Resolution • Time • Relaxation Effects • Trade Offs

  10. MRI Artifacts • Chemical Shift Artifacts • Aliasing • Black Boundary Artifacts • Gibbs or Truncation Artifacts • Zipper Artifacts • Phase-encoded Motion Artifacts • Entry Slice Phenomenon • Slice-overlap Artifacts • Magic Angle Effects • Moire Fringes • RF Overflow Artifacts • Central Point Artifact • Susceptibility Artifacts • Zero-fill Artifact (Zebra Artifact)

  11. Chemical Shift Artifacts

  12. Aliasing or "Wrap-around "

  13. Electronics and Data Processing

  14. Coil

  15. Angiography • DSA

  16. MRA

  17. CT angiography

More Related