UltraSound - Technology Information PortalThursday, 31 July 2014
Info
  Sheets



Out-
      side
 




 
 'Non-Linear Scattering' 
SEARCH FOR   
 
  12345ABCDEFGHIJKLMNOPQRSTUVWZ
Result : Searchterm 'Non-Linear Scattering' found in 1 term [] and 3 definitions [], (+ 2 Boolean[] results)
1 - 5 (of 6)     next
Result Pages : [1]  [2]
US Resources  
Service and Repair - 3d UltraSound - Jobs - UltraSound Physics - Veterinary UltraSound - Non-English
 
Non-Linear ScatteringMRI Resource Directory:<br> - UltraSound Physics -
 
Non-linear scattering describes in physics the conversion of a photon from one wavelength to one or more other wavelengths. In ultrasound, non-linear scattering is the generation of an echo containing higher harmonics. In the case of a microbubble, the oscillation is asymmetric with time, producing echoes with even harmonics.
See also Cross-section Scattering.
spacer
• Related Searches:
    • Ultrasound Gel
    • Hi Vision 5500 - EUB-5500
    • Densitometry
    • Narrow Bandwidth
    • Artemis 2

US Resources  
DICOM - Image Quality - Contrast Agents - Quality Advice - Intravascular - Prenatal
 
BR14InfoSheet: - Contrast Agents - 
Intro, 
Historical Development, 
Microbubbles,
etc.MRI Resource Directory:<br> - Contrast Agents -
 
From Bracco Research SA, Geneva, Switzerland,
BR14 is a new experimental ultrasound contrast agent, consisting of bubbles containing a high molecular weight filling gas enclosed by a flexible phospholipid monolayer shell a few nanometers thick.
This agent shows significant non-linear scattering and agent modification even at low insonation pressures, the detection pulses used did not destroy the contrast bubbles. The results obtained with HPD before the release burst show that the BR14 bubbles are efficient scatterers that can be modified and, thus, detected by low power insonation.

Drug Information and Specification:
RESEARCH NAME BR14
DEVELOPER Bracco Diagnostics, Inc.
DEVELOPMENT STAGE Preclinical
APPLICATION -
TYPE Microbubble
SHELL -
CHARGE Negative
GAS Perfluorobutane
MICROBUBBLE SIZE Mean size 3µm, 95% < 10µm
DO NOT RELY ON THE INFORMATION PROVIDED HERE, THEY ARE NOT A SUBSTITUTE FOR THE ACCOMPANYING PACKAGE INSERT!

spacer

 Further Reading:
  News & More:
The role of ultrasound in molecular imaging(.pdf)Open this link in a new window
2003   by bjr.birjournals.org    
US Resources  
Calculation - Societies - Pediatric - Contrast Agents - Heart - Devices Machines Scanners Systems
 
Pulse Inversion ImagingInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
(PII) Pulse inversion imaging (also called phase inversion imaging) is a non-linear imaging method specifically made for enhanced detection of microbubble ultrasound contrast agents. In PII, two pulses are sent in rapid succession into the tissue; the second pulse is a mirror image of the first. The resulting echoes are added at reception. Linear scattering of the two pulses will give two echoes which are inverted copies of each other, and these echoes will therefore cancel out when added.
Linear scattering dominates in tissues. Echoes from linear scatterers such as tissue cancel, whereas those from gas microbubbles do not. Non-linear scattering of the two pulses will give two echoes which do not cancel out completely due to different bubble response to positive and negative pressures of equal magnitude. The harmonic components add, and the signal intensity difference between non-linear and linear scatterers is therefore increased. The resulting images show high sensitivity to bubbles at the resolution of a conventional image.
In harmonic imaging, the frequency range of the transmitted pulse and the received signal should not overlap, but this restriction is less in pulse inversion imaging since the transmit frequencies are not filtered out, but rather subtracted. Broader transmit and receive bandwidths are therefore allowed, giving shorter pulses and improved axial resolution, hence the alternative term wideband harmonic imaging. Many ultrasound machines offer some form of pulse inversion imaging.
See also Pulse Inversion Doppler, Narrow Bandwidth, Dead Zone, Ultrasound Phantom.
spacer

US Resources  
Renal - Gynecology - PACS - Portable UltraSound - UltraSound Physics - Pediatric
 
QuantisonInfoSheet: - Contrast Agents - 
Intro, 
Historical Development, 
Microbubbles,
etc.MRI Resource Directory:<br> - Contrast Agents -
 
Quantison, consisting of air-filled microbubbles with stiff and rigid human serum albumin shells, is an investigational ultrasound contrast agent for the assessment of coronary artery disease.
The stiff shell inhibits the bubbles from oscillating and decrease non-linear scattering. Quantison is capable of long lasting cavity contrast and myocardial opacification using intermittent imaging.

Drug Information and Specification:
RESEARCH NAME AIP101
DEVELOPER Andaris Ltd. (acquired by Quadrant)
INDICATION -
DEVELOPMENT STAGE
Myocardial perfusion
APPLICATION Intravenous injection
TYPE Microbubble
SHELL Human serum albumin
CHARGE -
GAS Air
MICROBUBBLE SIZE -
PREPARATION Reconstitute with water
DO NOT RELY ON THE INFORMATION PROVIDED HERE, THEY ARE NOT A SUBSTITUTE FOR THE ACCOMPANYING PACKAGE INSERT!
spacer

US Resources  
Online Books - UltraSound Technician and Technologist Schools - Equipment and Parts - UltraSound Physics - Carotid - Journals
 
Harmonic Power DopplerInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
(HPD) Harmonic power Doppler is currently one of the most sensitive techniques for detecting ultrasound contrast agents. HPD works by transmitting multiple pulses toward the object to be imaged and detecting the pulse-to-pulse changes in the received echo signals.
Second harmonic bandbass filtering is applied to the received signals to exploit the non-linear behavior of scattering from bubbles (clutter). Harmonic power Doppler operates best at high output levels because of increased contrast destruction, and pulse amplitudes close to the maximum allowed are used much of the time.
With a high mechanical index, non-linear propagation of the sound will cause significant harmonic components from tissue, and the contrast agent to tissue ratio will decrease.
Also called Harmonic Power Angio. See also Multiple Frame Trigger.
spacer

 Further Reading:
  Basics:
Harmonic ImagingOpen this link in a new window
   by www.imasonic.com    
  News & More:
Three-Stage Approach to Ultrasound Contrast DetectionOpen this link in a new window
Wednesday, 4 July 2001   by folk.ntnu.no    
Combination of contrast with stress echocardiography: A practical guide to methods and interpretationOpen this link in a new window
2004   by www.cardiovascularultrasound.com    
US Resources  
Cardiac - Quality Advice - Vascular - Journals - RIS - Distributors
 
Related Searches:
 • Validation
 • Venous Ultrasound
 • Transcranial Doppler
 • Mobile BladderScan® BVI 6400
 • Digital
SEARCH FOR   
 
  12345ABCDEFGHIJKLMNOPQRSTUVWZ
     1 - 5 (of 6)     next
Result Pages : [1]  [2]
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

US-TIP    
Community   
User
Pass
Forgot your UserID/Password ?  


Look
      Ups



UltraSound - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • US-TIP • The-Medical-Market
Copyright © 2006 - 2014 SoftWays. All rights reserved.
Terms of Use | Privacy Policy | Advertising
 [last update: 2014-07-21 03:08:21]