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 'Coded Excitation' 
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Result : Searchterm 'Coded Excitation' found in 1 term [] and 4 definitions [])
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Searchterm 'Coded Excitation' was also found in the following service of US-TIP.com:  
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Coded ExcitationMRI Resource Directory: - UltraSound Physics -
 
Increasing the frequency of the transmitted power improves the image quality of ultrasound, but the improvement in resolution results in a decreased signal to noise ratio (SNR). Higher acoustic power levels can prevent the loss in SNR, but among other reasons, ultrasound regulations limit this to avoid heating or cavitation.
Coded excitation increase the signal to noise ratio without the loss of resolution by using coded waveforms. Coded excitation allows transmitting a long wide-band pulse with more acoustic power and high penetration of the sound beam.
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 Further Reading:
  Basics:
Coded Excitation in Ultrasound Harmonic ImagingOpen this link in a new window
   by www.ibbme.utoronto.ca    
Parameter optimization of pulse compression in ultrasound imaging systems with coded excitation(.pdf)Open this link in a new window
   by www.bm.technion.ac.il    
  News & More:
Coded Pulse Excitation for Ultrasonic Strain Imaging(.pdf)Open this link in a new window
Wednesday, 2 February 2005   by ultrasonics.bioen.uiuc.edu    
Estimation of ultrasonic attenuation in a bone using coded excitation(.pdf)Open this link in a new window
   by www.zuhost.ippt.gov.pl    
US Resources  
Preferential Sites - Ultrasound Guided Interventions - Image Quality - Quality Advice - Calculation - Resources
 
Image QualityInfoSheet: - Artifacts - Intro, Artifacts, ReductionMRI Resource Directory: - Artifacts -
 
The perfect image quality is dependent on some assumptions of the propagation of ultrasound waves in tissues after generating in an imaging system. These assumptions are important for the developing of optimal ultrasound imaging systems.
point The sound velocity in the examined tissue is homogeneous and constant (around 1540 m/s).
point The propagation of ultrasound is straight ahead.
point The ultrasound beam is infinite thin in its thickness and lateral direction.
point The detected echo comes from the shortest sound path between reflector and transducer.
point The ultrasound echo is originated by the last generated sound pulse.
point The amplitudes of the echoes are proportional to the difference of the acoustical impedance caused by different tissue layers.
A lot of steps can be taken to prevent artifacts and to improve image quality, for example beamforming is used to focus the ultrasound beam, and contrast agents decrease the reflectivity of the undesired interfaces or increase the backscattered echoes from the desired regions.
See also Coded Excitation, Validation and Refraction Artifact, Q-Value, Ultrasound Phantom, Dead Zone, Narrow Bandwidth.
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    ••    There are 8 news about 'Image Quality'.
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 Further Reading:
  Basics:
Sources and impact on artifacts(.pdf)Open this link in a new window
   by 3dultrasound.ucsd.edu    
  News & More:
Guidelines for the Safe Use of Diagnostic Ultrasound(.pdf)Open this link in a new window
   by folk.ntnu.no    
Real-time B-mode ultrasound quality control test procedures a Report of AAPM Ultrasound Task Group No. 1Open this link in a new window
   by www.aapm.org    
Searchterm 'Coded Excitation' was also found in the following service of US-TIP.com:  
News  (1)  
 
LOGIQ 5InfoSheet: - Devices - Intro, TypesMRI Resource Directory: - Devices Machines Scanners Systems -
 
gehealthcare.com/usen/ultrasound/genimg/products/logiq5/index.html

From GE Healthcare.;
Versatile High Performance System 'The LOGIQ 5 Expert ultrasound system delivers the premium performance advantage of TruScan architecture in a versatile high performance package. Advanced capabilities for outstanding clinical performance are available with the efficiency and productivity needed to meet clinical demands.'

Device Information and Specification
APPLICATIONS Abdominal, cardiac, musculoskeletal, neonatal, OB/GYN, small parts, transcranial, urologic, vascular
CONFIGURATION Normal system
TRANSDUCERS Multi-frequency, convex, linear, phased/sector
RANGE OF PROBE TYPE LOGIQ 5 Transducers
IMAGING MODES B-mode, M-mode, anatomic M-mode creation and adjustment, triplex, 3D ultrasound, pulsed wave Doppler, continuous wave Doppler, power Doppler, color Doppler, spectral Doppler
IMAGING OPTIONS Coded excitation, B-flow, anatomical M-mode, virtual convex, automatic optimization
OPTIONAL PACKAGE 3-D Digital processing and manipulation, DICOM 3.0 capable, plus VetPACS all digital interfacing
STORAGE, CONNECTIVITY, OS On-board patient, image and reporting archive, HDD, CD-ROM disk burner included, PCMCIA, USB, Windows-based OS
DATA PROCESSING Exclusive raw data digital acquisition and storage, 150+ frames per second truedigital imaging, all digital video clip and still image capture (4,000)
H*W*D m (inch.) 1.45 * 0.52 * 0.99 (57 * 20 * 39)
WEIGHT 180 kg (397 lbs.)
POWER CONSUMPTION less than 1.5 KVA
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    ••    There are 2 news about 'LOGIQ 5'.
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 Further Reading:
  Basics:
LOGIQ 5 Product Brochure(.pdf)Open this link in a new window
LOGIQ 5 SpecificationsOpen this link in a new window
LOGIQ 5 TransducersOpen this link in a new window
US Resources  
Contrast Agents - Education - Services and Supplies - Universities - DICOM - UltraSound Technician and Technologist Career
 
Voluson 730 ExpertInfoSheet: - Devices - Intro, TypesMRI Resource Directory: - Devices Machines Scanners Systems -
 
gehealthcare.com/usen/ultrasound/genimg/products/voluson730/index.html

From GE Healthcare.;
'GE is defining a new age of ultrasound. We call it Volume Ultrasound. GE's Voluson 730 Expert is a powerful system that enables real-time techniques for acquiring, navigating and analyzing volumetric images so that you can make clinical decisions with unprecedented confidence.'


Device Information and Specification
APPLICATIONS Abdominal, breast, cardiac, musculoskeletal, neonatal, OB/GYN, pediatric, small parts, transcranial, urological, vascular
CONFIGURATION 15" high resolution non-interlaced flat CRT, 4 active probe ports
RANGE OF PROBE TYPE Multifrequency, 4D, convex - micro convex, phased array, linear, specialty
TRANSDUCERS Transducer guide (PDF)
IMAGING MODES B-mode, M-mode, coded harmonic imaging (2-D), color flow mode (CFM), power Doppler imaging (PDI), color Doppler, pulsed wave Doppler, high pulse repetition frequency (HPRF) Doppler, tissue harmonic imaging, 3-D power Doppler
IMAGING OPTIONS CrossXBeam spatial compounding, coded excitation , spatio-temporal image correlation (STIC), B-Flow (simultaneous imaging of tissue and blood flow), strain rate imaging (SRI)
OPTIONAL PACKAGE STIC angio and color, CrossXBeamCRI, speckle reduction imaging, volume contrast imaging (VCI), inversion mode, volume calculation II, fetal heart analysis capabilities, interactive volume renderings
STORAGE, CONNECTIVITY, OS SonoView archiving and data management, network, HDD, DICOM 3.0, CD/DVD, MOD, USB, Windows-based
DATA PROCESSING Digital beamformer with 512 system processing channel technology
H*W*D m (inch.) 1.43 * 0.69 * 1.02 (56 * 27 * 40)
WEIGHT 136 kg (300 lbs.)
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 Further Reading:
  Basics:
Voluson 730 Expert Product Brochure(.pdf)Open this link in a new window
Voluson 730 Expert SpecificationsOpen this link in a new window
Voluson 730 Expert TransducersOpen this link in a new window
Searchterm 'Coded Excitation' was also found in the following service of US-TIP.com:  
News  (1)  
 
WaveformMRI Resource Directory: - UltraSound Physics -
 
The waveform is the record of a signal that varies over time. A blood flow signal for example, usually varies periodically with the cardiac cycle.
See also Coded Excitation, and Pulse Volume Recording.
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 Further Reading:
  News & More:
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  
UltraSound Reimbursement - Education - Thyroid - Corporations - Universities - Liver
 
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