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Searchterm 'probe' was also found in the following services: 
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Phased ArrayMRI Resource Directory:<br> - Probes Transducers -
 
A phased array probe applies voltage pulses to all elements as a group but with small time differences (phasing). The time difference is changed each time so that the sound pulses will be sent out in different directions.
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• Related Searches:
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    • Transducer
    • Beam Width Artifact
    • Vector Array Transducer

 Further Reading:
  Basics:
Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
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Radiology  (2) Open this link in a new windowMRI  (5) Open this link in a new window
Pregnancy UltrasoundMRI Resource Directory:<br> - Obstetric -
 
Pregnancy ultrasound testing is used as a screening to verify due date, determine causes of bleeding, check the overall health, development, gender and position of the baby, measure the amniotic fluid, and check the condition of the placenta.
About week five to seven, ultrasound is used to determine the size of the fetus, confirm the expected due date, and detect multiple fetuses. Ultrasound examinations show that the fetus is alive and distinguish between intrauterine or ectopic pregnancies.
About week 16 to 20, prenatal ultrasound confirms the growth, shows anatomic defects, the placenta and amniotic fluid.
Toward the end of pregnancy, the sonographer evaluates fetal size, position, growth, and the placenta.
Ultrasound guides the biopsy in amniocentesis procedures and chorionic villus sampling to collect cells from the placenta or amniotic fluid.
See also Doppler Fluximetry in Pregnancy, Fetal Ultrasound and Vaginal Probe.
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 Further Reading:
  Basics:
Female pelvis - ultrasound anatomyOpen this link in a new window
   by rad.usuhs.mil    
Online Ultrasound Clinical HandbookOpen this link in a new window
   by www.pear.co.nz    
  News & More:
ultrasound of blighted ovumOpen this link in a new window
   by rad.usuhs.mil    
EDUCATIONAL TUTORIALS: ULTRASOUND - IMAGING Open this link in a new window
   by www.obgyn.net    
US Resources  
Doppler UltraSound - - UltraSound Physics - 4d UltraSound - Musculoskeletal and Joint - Equipment and Parts
 
Prostate UltrasoundMRI Resource Directory:<br> - Pelvic -
 
The prostate is a walnut-shaped gland surrounding the beginning of the urethra in front of the rectum and below the bladder. The prostate can become enlarged (particularly in men over age 50) and develop diseases like prostate cancer or inflammation (prostatitis). A large tumor can be felt by a rectal examination. The most effective way of detecting the early signs of prostate cancer is a combination of a prostate-specific antigen (PSA) blood test and a prostate ultrasound examination.
An abnormally high level of PSA can indicate prostate cancer or other prostate diseases such as benign prostatic hypertrophy or prostatitis. The transrectal sonography is an important diagnostic ultrasound procedure in determining whether there is any benign enlargement of the prostate or any abnormal nodules.
The imaging is performed with a rectal probe, yielding high resolution. High resolution 3D ultrasound provides reliable and accurate determination of the size and the location of cancer. Additionally, ultrasound elastography is a technique in development to improve the specificity and sensitivity of cancer detection. Ultrasound is also used to detect whether cancerous tissue is still only within the prostate or whether it has begun to spread out and to guide a diagnostic biopsy or ultrasound therapy.
See also Brachytherapy, and High Intensity Focused Ultrasound.
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• View the news results for 'Prostate Ultrasound' (17).



 Further Reading:
  News & More:
Sonography Transmission Gel as Endorectal Contrast Agent for Tumor Visualization in Rectal CancerOpen this link in a new window
Monday, 14 January 2008   by www.ajronline.org    
Searchterm 'probe' was also found in the following services: 
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Real-Time ScannerInfoSheet: - Devices -
Intro, 
TypesMRI Resource Directory:<br> - Devices Machines Scanners Systems -
 
Most usual ultrasound machines are 2D real-time systems. This types of ultrasound scanners allow to assess both motion and anatomy, including the motion of heart valves, the movement of intestines and lungs and also to guide interventions, like for example a biopsy or a laparoscopic ultrasound.
A standard real-time scanner consists of a mobile console with the monitor on the top and rows of small containers at the bottom to accommodate a variety of scanner probes. The linear, curved or phased array transducers are usually equipped with multiple crystals or in some cases with a moving crystal. A real-time scanner may be e.g., a mechanical scanner or electronic array scanner.
See also Musculoskeletal and Joint Ultrasound.
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 Further Reading:
  News & More:
Bedside Limited Echocardiography by the Emergency Physician Is Accurate During Evaluation of the Critically Ill PatientOpen this link in a new window
2004   by www.ncbi.nlm.nih.gov    
Metastatic bladder carcinoma to liver biopsy, proven with ultrasound guidanceOpen this link in a new window
   by rad.usuhs.mil    
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Radiology  (2) Open this link in a new windowMRI  (5) Open this link in a new window
ReflectionMRI Resource Directory:<br> - UltraSound Physics -
 
Reflection of the sound beam occurs when it hits a boundary between materials having different acoustic impedance. The reflection (echo) is the portion of a sound that is returned from the boundary. The reflection time (the time taken for the wave to return to the probe) can be used to determine the depth of the object.
The reflection within the body produces the ultrasound image, but should be minimized at an ultrasound couplant to skin boundary where the couplant acts as an acoustic window through which the image is seen. The amount of sound waves, which are reflected back at the interface between two tissues is depend on the angle of incidence and the difference between the acoustic impedance values of the two tissues.
If the difference is great, a large part of the sound waves will be reflected back. If too much sound is reflected back and not enough waves are remaining to be able to penetrate the tissue, the imaging will be poor.
If the difference is small, a small amount will be reflected back. Enough sound signal remains to continue with ultrasound imaging.
If the ultrasound beam meets a rough surface or small object, the beam is scattered in all directions and only a small amount will be received by the probe.
See also False Distance Artifact, Target Strength, and Snells Law.
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 Further Reading:
  News & More:
Ultrasound in diagnostic and therapyOpen this link in a new window
   by www.anst.uu.se    
US Resources  
Journals - Cardiac - Renal - Calculation - - UltraSound Technician and Technologist Schools
 
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 • Transducer Assembly
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