UltraSound - Technology Information PortalTuesday, 21 February 2017
Info
  Sheets



Out-
      side
 




 
 'Transducer Types' 
SEARCH FOR   
 
  12345ABCDEFGHIJKLMNOPQRSTUVWZ
Result : Searchterm 'Transducer Types' found in 1 term [] and 2 definitions [], (+ 12 Boolean[] results)
1 - 5 (of 15)     next
Result Pages : [1]  [2 3]
US Resources  
Resources pool - Universities - Obstetric - UltraSound Training Courses - UltraSound Reimbursement - Musculoskeletal and Joint
 
Transducer TypesInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
Transducers can be divided in:
1.) Transducers where the sound wave is transmitted and received by different elements.
2.) Transducers where multiple elements part of the time transmit and part of the time receive sound energy.
The first type of ultrasound transducer is used in detection of blood flow (also called nonimaging transducers). For example, the continuous wave transducer (Pedoff transducer) has two separate elements, where one element is always transmitting while the other element is always receiving.
Probes of the second type are used to image cardiac structures and have the capability to use various Doppler techniques to detect blood flow (also called imaging transducers). For example, continuous wave, pulsed wave, high pulse repetition frequency, color flow, M-mode, and 2D-mode are the various modes that this type of transducer can perform.

Transducers can also be divided in mechanical and electronic or phased scan types.
Mechanical transducers use a combination of single element oscillation, multiple element rotation, or a single element and set of acoustic mirrors to generate the sweeping beam for 2D mode. Caused by the vibration (created as the mirrors rotate or oscillate inside the cover) is this type sometimes called the 'wobbler'. Mechanical transducers are cheaper than electronic transducers.
Different types of electronic or phased array probes can create a linear or rectangular shaped scan plane as well as a sector or pie shaped scan plane. Sector scanners are most useful for cardiac ultrasound examinations where the beam is directed between the ribs to image the heart. A linear array transducer is more useful in abdominal, OB/GYN, and small parts examinations. Electronic transducers are more expensive but they provide dynamic focusing and smaller probe.
See also Rectangular Array Transducer.
Radiology-tip.comX-Ray Tube
spacer
Radiology-tip.comCoil,  Transmitter
spacer
• Related Searches:
    • Transducer
    • Q-Value
    • Ultrasound Machine
    • Linear Probe
    • Transducer Pulse Control

 Further Reading:
  Basics:
Medical Physics: Ultrasound - extended reading exerciseOpen this link in a new window
   by www.cyberphysics.pwp.blueyonder.co.uk    
US Resources  
Patient Information - Calculation - Prenatal - Examinations - Corporations - Movies
 
Array TransducerInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
An array transducer is composed of multiple piezoelectric crystal elements arranged in an array. Arrays are transducer assemblies with a row of elements, used to focus the beam.

Types of array transducers:
point Linear array transducer = the arrays are arranged along a line.
point Curvilinear or curved transducer = the arrays are arranged along a convex curve. A curved array is similar to a linear array except that the image created is a sector-type.
point Annular array transducer = the arrays are arranged in concentric circles.
point Rectangular array transducer = the arrays are arranged in a rectangular pattern.
See also Amplitude Shading, Transducer Types, and Transducer Assembly.
spacer

 Further Reading:
  Basics:
Transmission Line Matrix (TLM) modelling of medical ultrasound(.pdf)Open this link in a new window
   by www.era.lib.ed.ac.uk    
  News & More:
Ultrasound renal anatomyOpen this link in a new window
   by rad.usuhs.mil    
US Resources  
Gynecology - Education pool - Pregnancy - Non-English - Carotid - Resources pool
 
TransducerInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
A transducer is a device, usually electrical or electronic, that converts one type of energy to another. Most transducers are either sensors or actuators. A transducer (also called probe) is a main part of the ultrasound machine. The transducer sends ultrasound waves into the body and receives the echoes produced by the waves when it is placed on or over the body part being imaged.
Ultrasound transducers are made from crystals with piezoelectric properties. This material vibrates at a resonant frequency, when an alternating electric current is applied. The vibration is transmitted into the tissue in short bursts. The speed of transmission within most soft tissues is 1540 m/s, producing a transit time of 6.5 ms/cm. Because the velocity of ultrasound waves is constant, the time taken for the wave to return to the transducer can be used to determine the depth of the object causing the reflection.
The waves will be reflected when they encounter a boundary between two tissues of different density (e.g. soft tissue and bone) and return to the transducer. Conversely, the crystals emit electrical currents when sound or pressure waves hit them (piezoelectric effect). The same crystals can be used to send and receive sound waves; the probe then acts as a receiver, converting mechanical energy back into an electric signal which is used to display an image. A sound absorbing substance eliminates back reflections from the probe itself, and an acoustic lens focuses the emitted sound waves. Then, the received signal gets processed by software to an image which is displayed at a monitor.
Transducer heads may contain one or more crystal elements. In multi-element probes, each crystal has its own circuit. The advantage is that the ultrasound beam can be controlled by changing the timing in which each element gets pulsed. Especially for cardiac ultrasound it is important to steer the beam.
Usually, several different transducer types are available to select the appropriate one for optimal imaging. Probes are formed in many shapes and sizes. The shape of the probe determines its field of view.
Transducers are described in megahertz (MHz) indicating their sound wave frequency. The frequency of emitted sound waves determines how deep the sound beam penetrates and the resolution of the image. Most transducers are only able to emit one frequency because the piezoelectric ceramic or crystals within it have a certain inherent frequency, but multi-frequency probes are also available.
See also Blanking Distance, Damping, Maximum Response Axis, Omnidirectional, and Huygens Principle.
Radiology-tip.comTransmitter
spacer

• View the news results for 'Transducer' (6).



 Further Reading:
  Basics:
Testing Diagnostic Ultrasound Probes For Bad CrystalsOpen this link in a new window
Saturday, 19 September 1998   by www.pamia.org    
  News & More:
Ultrasound beamforming and image formation(.pdf)Open this link in a new window
2007   by dukemil.bme.duke.edu    
Transmission Line Matrix (TLM) modelling of medical ultrasound(.pdf)Open this link in a new window
   by www.era.lib.ed.ac.uk    
US Resources  
Cardiac - Universities - Contrast Agents - Portable UltraSound - Ultrasound Gel - PACS
 
B-ModeInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
Also called B-mode echography, B-mode sonography, 2D-mode, and sonogram.
B-mode ultrasound (Brightness-mode) is the display of a 2D-map of B-mode data, currently the most common form of ultrasound imaging.
The development from A-mode to B-mode is that the ultrasound signal is used to produce various points whose brightness depends on the amplitude instead of the spiking vertical movements in the A-mode. Sweeping a narrow ultrasound beam through the area being examined while transmitting pulses and detecting echoes along closely spaced scan lines produces B-scan images. The vertical position of each bright dot is determined by the time delay from pulse transmission to return of the echo, and the horizontal position by the location of the receiving transducer element.
To generate a rapid series of individual 2D images that show motion, the ultrasound beam is swept repeatedly. The returning sound pulses in B-mode have different shades of darkness depending on their intensities. The varying shades of gray reflect variations in the texture of internal organs. This form of display (solid areas appear white and fluid areas appear black) is also called gray scale.

Different types of displayed B-mode images are:
point two-dimensional, 2D-mode;
point gray scale;
point real-time mode;
point compound B-mode.

The probe movement can be performed manual (compound and static B-scanner) or automatic (real-time scanner).
The image reconstruction can be parallel or sector type.
See also B-Scan, 4B-Mode, and Harmonic B-Mode Imaging.
spacer

 Further Reading:
  Basics:
Medical Physics: Ultrasound - extended reading exerciseOpen this link in a new window
   by www.cyberphysics.pwp.blueyonder.co.uk    
  News & More:
Ultrasound anatomy of the neckOpen this link in a new window
   by rad.usuhs.mil    
US Resources  
RIS - UltraSound Physics - Ultrasound Gel - Manufacturers - Developers - Research Labs
 
ArrayMRI Resource Directory:<br> - Probes Transducers -
 
Arrays are spatial arrangements of transducers or transducer elements.
See also Composite Array.

Array types used in ultrasound imaging:
point annular array - elements arranged in concentric circles;
point curved array - elements arranged along a convex curve;
point linear array - elements are arranged along a line;
point rectangular array - elements arranged in a rectangular pattern.
spacer

 Further Reading:
  News & More:
Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
US Resources  
Resources - Liver - Online Books - Gall Bladder - Vaginal - PACS
 
Related Searches:
 • Ultrasound Machine
 • Vector Array Transducer
 • Ultrasound System Performance
 • Transducer Pulse Control
 • Q-Value
SEARCH FOR   
 
  12345ABCDEFGHIJKLMNOPQRSTUVWZ
     1 - 5 (of 15)     next
Result Pages : [1]  [2 3]
 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 - 2016 SoftWays. All rights reserved.
Terms of Use | Privacy Policy | Advertising
 [last update: 2015-03-04 09:17:02]