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Intravascular UltrasoundMRI Resource Directory:<br> - Intravascular -
 
(IVUS) For intravascular ultrasound a small IVUS catheter with a probe is introduced into the artery. The transducer transmits and receives acoustic energy through this catheter. The reflected acoustic energy is used to build a picture of the inside of the vessel. A IVUS image consists of three layers around the lumen, the intima, media and adventitia.
In addition, elastography or palpography could be used to evaluate the local mechanical properties of tissues (e.g. lipid pools in high-risk vulnerable atherosclerotic plaques). These techniques use the deformation caused by the intraluminal pressure generated by the probe.
A high strain region at the lumen vessel wall boundary has 88% sensitivity and 89% specificity for identifying vulnerable plaques. There are high strain values of 1% in soft plaques with increased strain up to 2% at the shoulders of the plaque, while calcified material shows low strain values (0-0.2%). The radial strain in the tissue is obtained by cross-correlation techniques on the radio frequency signal. The strain is color-coded and plotted as a complimentary image to the intravascular ultrasound echogram.
See also Interventional Ultrasound, Vascular Ultrasound.
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• View the news results for 'Intravascular Ultrasound' (8).


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 Further Reading:
  Basics:
Intravascular Ultrasound (IVUS)Open this link in a new window
   by www.ptca.org    
  News & More:
Biplane Color Flow Duplex Intravenous Intravascular Ultrasound for Arterial VisualizationOpen this link in a new window
2004   by enth.allenpress.com    
Searchterm 'probe' was also found in the following service: 
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Radiology  (2) Open this link in a new windowMRI  (5) Open this link in a new window
iU22InfoSheet: - Devices -
Intro, 
TypesMRI Resource Directory:<br> - Devices Machines Scanners Systems -
 
www.medical.philips.com/main/products/ultrasound/general/iu22/

From Philips Medical Systems;
'The Philips iU22 system combines Intelligent Design, including breakthroughs in ergonomics, with Intelligent Control, providing new levels of automation, to give you revolutionary performance and workflow.'

Device Information and Specification
APPLICATIONS Abdominal, cardiac (also for adults with TEE), musculoskeletal (also pediatric), OB/GYN, prostate, small parts, transcranial, vascular
CONFIGURATION 17" high resolution non-interlaced flat CRT, 4 active probe ports
RANGE OF PROBE TYPE Multi-frequency, 4D, convex - micro convex, phased array, linear, specialty
TRANSDUCERS -
IMAGING MODES B-mode, M-mode, coded harmonic imaging, color flow mode (CFM), power Doppler imaging (PDI), color Doppler, pulsed wave Doppler, tissue harmonic imaging
IMAGING OPTIONS CrossXBeam spatial compounding, coded ultrasound acquisition),speckle reduction imaging (SRI), TruScan technology store raw data, CINE review with 4 speed types
OPTIONAL PACKAGE Transesophageal scanning, stress echo, tissue velocity imaging (TVI), tissue velocity Doppler (TVD), contrast harmonic imaging
STORAGE, CONNECTIVITY, OS Patient and image archive, HDD, DICOM 3.0, CD/DVD, MOD, Windows-based
DATA PROCESSING Digital beamformer with 1024 system processing channel technology
H*W*D m (inch.) 1.62 * 0.61 * 0.99 (64 * 22 * 43)
WEIGHT kg (345 lbs.)
POWER CONSUMPTION
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 Further Reading:
  Basics:
iU22 Ultrasound SystemOpen this link in a new window
   by www.medical.philips.com    
US Resources  
Endoscopic - History of UltraSound - Journals - RIS - Portable UltraSound - Education
 
Laparoscopic UltrasoundMRI Resource Directory:<br> - Endoscopic -
 
(LUS) Diagnostic laparoscopy combined with laparoscopic ultrasound is used for staging tumors and to monitor surgical interventions like for example radiofrequency ablation or cryotherapy. Laparoscopic ultrasound provides direct contact imaging of organs with high frequency ultrasound. Laparoscopic ultrasound identifies and characterizes the tumor, guides the probe, and monitors the progression of the freezing or the thermal destruction. This procedure avoid unnecessary open surgery and improves selection of patients for tumor resection e.g., in liver and pancreas.
Challenges of LUS are limitations of the intraoperative acoustic windows and the possible movement of the probe and that standard orientation techniques are difficult to apply with laparoscopic instruments, resulting in images from oblique planes. 3D ultrasound or special navigation systems may be helpful.
See also Ultrasound Therapy.
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 Further Reading:
  Basics:
Biliary ProceduresOpen this link in a new window
   by www.cpmc.org    
  News & More:
A Navigation System for Augmenting Laparoscopic UltrasoundOpen this link in a new window
   by www.na-mic.org    
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Linear Array TransducerInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
Linear array transducer elements are rectangular and arranged in a line. Linear array probes are described by the radius of width in mm. A linear array transducer can have up to 512 elements spaced over 75-120 mm. The beam produced by such a narrow element will diverge rapidly after the wave travels only a few millimeters. The smaller the face of the transducer, the more divergent is the beam. This would result in poor lateral resolution due to beam divergence and low sensitivity due to the small element size.
In order to overcome this, adjacent elements are pulsed simultaneously (typically 8 to 16; or more in wide-aperture designs). In a subgroup of x elements, the inner elements pulse delayed with respect to the outer elements. The interference of the x small divergent wavelets produces a focused beam. The delay time determines the depth of focus for the transmitted beam and can be changed during scanning.
Linear arrays are usually cheaper than sector scanners but have greater skin contact and therefore make it difficult to reach organs between ribs such as the heart. One-dimensional linear array transducers may have dynamic, electronic focusing providing a narrow ultrasound beam in the image plane. In the z-plane (elevation plane - perpendicular to the image plane) focusing may be provided by an acoustic lens with a fixed focal zone.
Rectangular or matrix transducers with unequal rows of transducer elements are two-dimensional (2D), but they are termed 1.5D, because the number of rows is much less than the number of columns. These transducers provide dynamic, electronic focusing even in the z-plane.
See also Rectangular Array Transducer.
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 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:
Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
Searchterm 'probe' was also found in the following service: 
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LOGIQ 5InfoSheet: - Devices -
Intro, 
TypesMRI Resource Directory:<br> - 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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• View the news results for 'LOGIQ 5' (2).



 Further Reading:
  Basics:
LOGIQ 5 Product Brochure(.pdf)Open this link in a new window
US Resources  
Intravascular - Fetal - Movies - General - Corporations - Societies
 
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