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 'Ultrasound Imaging' 
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Ultrasound ImagingMRI Resource Directory:<br> - UltraSound Physics -
 
(US) Also called echography, sonography, ultrasonography, echotomography, ultrasonic tomography.
Ultrasonic waves generated by a quartz crystal, cause mechanical perturbation of an elastic medium with rarefaction and compression of the medium particles. These waves are reflected at the interfaces between different tissues due to differences in the mechanical properties of the tissues. The transmission and reflection of these high-frequency waves are displayed with different types of ultrasound modes.
Using the wave propagation speed in tissues, the time of reflection information can be converted into distance of reflection information. The higher the frequency used in medical ultrasound imaging, the better the image resolution. With higher frequencies, the absorption of the sound beam by the medium is also higher and the beam cannot penetrate so far.
Higher frequencies, for example 7.5 MHz are used to provide good detail of superficial organs such as the thyroid gland and the breast. Lower frequencies, for example 3.5 MHz are used for examinations of the abdomen.
The advantages of ultrasound in medical imaging are:
list_point The procedure is noninvasive.
list_point Ultrasound is safe with no potential risks.
list_point It is easy available and relatively less expensive.
Diagnostic ultrasound imaging is generally a safe technique with no adverse effects. Since ultrasound is so widely used in pregnancy and in pediatric imaging, it is essential for all practitioners to ensure that its use remains safe. Ultrasound causes mechanical and thermal effects in tissue which are increased as the output power is increased.
There has been a general trend towards increased output with the introduction of color flow imaging, more use of pulsed spectral Doppler and higher demands on B-mode imaging. In response to these increasings, recommendations for the safe use of ultrasound have been issued. In addition, recent ultrasound safety regulations have changed to more responsibility of the operator to ensure that ultrasound is used safely.
See also Skinline, Pregnancy Ultrasound, Obstetric and Gynecologic Ultrasound, Musculoskeletal and Joint Ultrasound, and Prostate Ultrasound.
Radiology-tip.comDigital Radiography
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Radiology-tip.comMRI Procedure
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• View the news results for 'Ultrasound Imaging' (49).


• Related Searches:
    • History of Ultrasound
    • Thyroid Ultrasound
    • Liver Sonography
    • Ultrasound Imaging Modes
    • Urologic Ultrasound

 Further Reading:
  Basics:
Ultrasound Physics Main differences between Ultrasound and X-rays, Velocity of sound in some Biological MaterialsOpen this link in a new window
   by www.drgdiaz.com    
  News & More:
ultrasound characteristics of breast cancerOpen this link in a new window
   by rad.usuhs.mil    
Ultrasound anatomy of the neckOpen this link in a new window
   by rad.usuhs.mil    
Searchterm 'Ultrasound Imaging' was also found in the following services: 
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Ultrasound Imaging ModesInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
Ultrasound imaging is excellent for diagnosing cysts and other fluids in soft tissue. For ultrasound imaging or ultrasonography, different modes are used to examine the arterial/venous system, heart, pancreas, urinary system, ovaries, spinal cord, joints and more.
Power levels, frequencies used, amplification, and beamforming determine the clarity of the image. These things are controlled by the sonographer, interacting with the properties of the ultrasound machine.

Various imaging modes:
point A-mode;
point B-mode;
point QB-mode;
point M-mode;
point real-time mode;
point pulsed wave Doppler;
point continuous wave Doppler;
point color Doppler;
point color power Doppler;
point duplex.
Radiology-tip.comPulse Sequence
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 Further Reading:
  News & More:
Module 1: Basic A-scan Biometry Section 1: Basic ConceptsOpen this link in a new window
   by www.eyetec.net    
US Resources  
Endoscopic - Vascular - Devices Machines Scanners Systems - Carotid - Gynecology - Rental
 
Ultrasound Imaging ProceduresMRI Resource Directory:<br> - Patient Information -
 
Ultrasound imaging procedures are widely used in medicine. It is possible to perform diagnostic or therapeutic procedures with the guidance of ultrasonography (interventional ultrasound biopsies or drainage of fluid collections). Sonography or ultrasound scanning involves the application of an ultrasound transducer used to transmit high frequency sound waves, which bounce off internal structures to produce an image that can be displayed and recorded.
Ultrasound imaging procedures include for example:
point A-scan;
point B-scan;
point echocardiography;
point Doppler ultrasound;
point interventional ultrasound (e.g., endoscopic ultrasound);
point ultrasound treatment (e.g., high intensity focused ultrasound).
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 Further Reading:
  News & More:
Path from ultrasound guided biopsy on 18 Dec 03 pendingOpen this link in a new window
   by rad.usuhs.mil    
Searchterm 'Ultrasound Imaging' was also found in the following services: 
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News  (281)  Resources  (88)  
 
A-ModeInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
A-mode (Amplitude-mode) ultrasound is used to judge the depth of an organ, or otherwise assess an organ's dimensions. A-mode technology has been used in midline echoencephalography for rapid screening of intracranial mass lesions and ophthalmologic scanning. A-mode ultrasound imaging is now obsolete in medical imaging. The A-mode scan had also been used for early pregnancy assessment (detection of fetal heart beat), cephalometry and placental localization.
When the ultrasound beam encounters an anatomic boundary, the received sound impulse is processed to appear as a vertical reflection of a point. On the display, it looks like spikes of different heights (the amplitude). The intensity of the returning impulse determined the height of the vertical reflection and the time it took for the impulse to make the round trip would determine the space between verticals. The distance between these spikes can be measured accurately by dividing the speed of sound in tissue (1540 m/sec) by half the sound travel time.
To make an echoencephalography scan, the first A-mode scan is obtained from the right side of the head and the image captured on film. Then the probe is placed at the corresponding point on the left side. The second exposure is made on the same film with inverted spikes. The A-mode ultrasound could be used to identify structures normally located in the midline of the brain such as the third ventricle and falx cerebri. The midline structures would be aligned in normal patients but show displacement in patients with mass lesion such as a subdural, epidural, or intracranial hemorrhage.
See also Ultrasound Biomicroscopy, A-scan, B-mode and the Infosheet about ultrasound modes.
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 Further Reading:
  Basics:
A-Mode EchoencephalographyOpen this link in a new window
   by www.obgyn.net    
A-Mode Area RatioOpen this link in a new window
   by www.wildultrasound.com    
  News & More:
Module 1: Basic A-scan Biometry Section 1: Basic ConceptsOpen this link in a new window
   by www.eyetec.net    
Searchterm 'Ultrasound Imaging' was also found in the following services: 
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Radiology  (3) Open this link in a new windowMRI  (16) Open this link in a new windowMarket  (1) Open this link in a new window
AI-700InfoSheet: - Contrast Agents - 
Intro, 
Historical Development, 
Microbubbles,
etc.MRI Resource Directory:<br> - Contrast Agents -
 
From Acusphere Inc
AI-700 is an US contrast agent, usable for myocardial perfusion undergoing regulatory FDA approval. The synthetic polymers used in AI-700 do not break during the ultrasound imaging procedure. The used perfluorocarbon filling gas is less soluble in water and therefore has the propensity to stay inside the contrast agent particles. As a result, a higher concentration of gas is delivered to the myocardium over a longer period of time, thereby enabling AI-700 to target the broader application of myocardial perfusion assessment.
AI-700 is a dry powder consisting of small, porous microparticles filled with perfluoropropane. These microparticles are made of a synthetic biodegradable polymer, called poly (D, L-lactide co-glycolide), or PLGA, that has been used in other drug delivery systems approved by the FDA.
The composition and structure of the phospholipid containing microparticles and the properties of the perfluorocarbon gas slow the rate at which the gas dissolves and prevent the microparticles from being quickly broken down. The powder is to suspend in sterile water and injected by a single intravenous injection prior to ultrasound imaging.

In June 2004, Acusphere entered into a Collaboration, License and Supply Agreement with Nycomed Danmark APS for the European development and marketing rights to Acusphere’s lead product candidate AI-700.
Nycomed will be responsible for sales, marketing and the regulatory submissions required for marketing throughout its sales territory, which includes the member states of the European Union, as well as Russia/CIS and the Baltic States.

Drug Information and Specification:
RESEARCH NAME AI 700
DEVELOPER Acusphere, Inc.
INDICATION -
DEVELOPMENT STAGE
myocardial perfusion
APPLICATION Intravenous injection
TYPE Microbubble
SHELL Poly-L-lactide co glycolide
CHARGE Negative
GAS Perfluorocarbon
MICROBUBBLE SIZE -
PREPARATION Reconstitute with water
DO NOT RELY ON THE INFORMATION PROVIDED HERE, THEY ARE NOT A SUBSTITUTE FOR THE ACCOMPANYING PACKAGE INSERT!

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 Further Reading:
  News & More:
Acusphere's AI-700 Pilot Study Exceeds ExpectationsOpen this link in a new window
Thursday, 6 January 2005   by www.thefreelibrary.com    
Acusphere Reaches AI-700 Clinical Trial Milestone; 300 Patients Enrolled in Phase 3 Clinical ProgramOpen this link in a new window
Thursday, 16 December 2004   by phx.corporate-ir.net    
A Method for Radiation-Force Localized DrugDelivery Using Gas-Filled Lipospheres(.pdf)Open this link in a new window
Wednesday, 7 July 2004   by www.ncbi.nlm.nih.gov    
Acusphere Completes Enrollment in Second Phase 3 ClinicalOpen this link in a new window
Friday, 5 May 2006   by phx.corporate-ir.net    
US Resources  
Kidney - Musculoskeletal and Joint - Pelvic - Thyroid - Online Books - Pediatric
 
Related Searches:
 • Contrast Enhanced Ultrasound
 • Urologic Ultrasound
 • Thyroid Ultrasound
 • Pediatric Ultrasound
 • Tissue Harmonic Imaging
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