Thursday, August 21, 2014
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
Sharp Launches 12-Mpixel CMOS Sensor for 4k Video
LG Delivers New Bluetooth Minibeam Projector, More L Series Smartphones<
HP Reports Revenue Gain
Opera Browser Coming On Windows Phones
Shuttle Presents ARM-based Android PCs
Infineon To Buy International Rectifier for Approximately $3 Billion
Verizon May Launch New App Store
ZTE Nubia 5S mini LTE Coming Unlocked For $280
Active Discussions
help questions structure DVDR
Made video, won't play back easily
Questions durability monitor LCD
Questions fungus CD/DVD Media, Some expert engineer in optical media can help me?
CD, DVD and Blu-ray burning for Android in development
IBM supercharges Power servers with graphics chips
Werner Vogels: four cloud computing trends for 2014
Video editing software.
 Home > News > General Computing > Philips...
Last 7 Days News : SU MO TU WE TH FR SA All News

Thursday, June 30, 2005
Philips Demonstrates New imaging Technique Based on Magnetic Particles


Scientists at Philips Research have been active in developing a completely new imaging technique called Magnetic Particle Imaging (MPI) and have demonstrated the feasibility of the technique.

Although still in the early research stages, the new technique offers potential as a valuable addition to the current armory of imaging techniques for medical imaging and materials analysis. Results of the work have been published in the June 30 edition of "Nature".

The idea behind MPI is to produce spatial images by measuring the magnetic fields generated by magnetic particles in a tracer. While previous approaches to realize this resulted in relatively poor spatial resolution or low sensitivity, the method invented by Philips generates high-resolution images at low dosages. This is achieved by combining the nonlinear magnetization curve of the small magnetic particles with an inhomogeneous magnetic field.

The particles are subjected to a time-varying sinusoidal magnetic field with sufficiently high amplitude to drive their magnetization into the non-linear region. This induces high-frequency harmonics in the resulting time-varying magnetization that can be easily extracted from the fundamental or drive frequency by filtering. If the magnetic particles are simultaneously exposed to a time-constant magnetic field of sufficiently large magnitude, the particle magnetization becomes saturated and the generation of harmonics is suppressed.

This opens the possibility of producing an imaging device in which the time-constant field is constructed such that the magnitude of the field drops to zero at a single point in the field known as the 'field-free point' and increases in magnitude towards the edges. A signal containing harmonics will then be detected only from magnetic particles located in the vicinity of the field-free point; at all other points the magnetic particles are fully saturated by the time-constant field and produce no signal. So by scanning the field-free point through the volume of interest, it is possible to develop a 3D image of the magnetic-particle distribution. Movement of the field-free point can be achieved either mechanically or by field-induced movement. Both techniques have been investigated by the Philips researchers.

The researchers have evaluated the new MPI technique using commercially-available magnetic tracers. Conducted on 'phantom' objects, these investigations have demonstrated the feasibility of MPI and show that it has potential to be developed into an imaging method characterized by both high spatial resolution and high sensitivity. The expected high sensitivity leads to the presumption that the technique could become a valuable addition to other medical imaging modalities.

Besides its potential in medical imaging, MPI also shows promise as an imaging technique for materials research - specifically in the investigation of cracks and cavities in insulating materials like polymers or ceramics.


Previous
Next
CyberLink, MediaTek to Deliver DVD-R DL Recording        All News        RIAA Suits 784 File Sharers
P2P Monitoring by French Rights Organisation     General Computing News      RIAA Suits 784 File Sharers

Get RSS feed Easy Print E-Mail this Message

Related News
Philips to Create New Lumileds and Automotive Lighting Businesses Company
Philips and Salesforce.com To Deliver Cloud-based Healthcare Information Technology
EU To Fine Philips, Infineon And Samsung
Philips to Sell WOOX Innovations to Gibson
Philips Announces Its 2014 TV Lineup
MWC: Philips and Ericsson Unite On Smart Street Lighting
Philips Lighting System Guides You Through The Supermarket
Philips to transfer Remaining Stake in TV Joint Venture to TPV
Philips At CES 2014
Philips Celebrates 100 Years of Research
EU Raids Samung, Philips In Antitrust Probe
Funai Sues Philips For Breach of Contract

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .