UltraSound - Technology Information PortalWednesday, 22 February 2017
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Radiology Database Open this link in a new window Magnetic Resonance Imaging Database Open this link in a new window
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Portals - RIS - Breast - Probes Transducers - Devices Machines Scanners Systems - Cardiac
 
A-ModeInfoSheet: - Modes - 
Intro, 
Basic Modes, 
Doppler Modes, 
Contrast ModesMRI Resource Directory:
 - 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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• View the NEWS results for 'A-Mode' (1).Open this link in a new window.

• View the DATABASE results for 'A-Mode' (10).Open this link in a new window.

 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    
A-ScanMRI Resource Directory:
 - Modes -
 
A-scans are used in ophthalmologic scanning, to detect and monitor pregnancy problems, and screen intracranial mass lesions by using A-modes.
A-scan ultrasound biometry, commonly referred to as an A-scan, is a routine diagnostic test used in ophthalmology. The A-scan provides data on the shape of the eye, which is a major determinant in common sight disorders.
Ultrasound scanners used in this type of test require usually direct contact with the eye.
See also A-Mode, Oculoplethysmography, Ultrasound Biomicroscopy, B-Scan, C-Scan and D-Scan.
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• View the DATABASE results for 'A-Scan' (9).Open this link in a new window.

 Further Reading:
  Basics:
Medical Physics: Ultrasound - extended reading exerciseOpen this link in a new window
   by www.cyberphysics.pwp.blueyonder.co.uk    
  News & More:
Evaluation of the validity and reliability of A-scan ultrasound biometry with a single use disposable coverOpen this link in a new window
2002   by bjo.bmjjournals.com    
US Resources  
3d UltraSound - Used and Refurbished UltraSound Equipment - Equipment and Parts - Probes Transducers - Ultrasound Gel - Gall Bladder
 
Abdominal UltrasoundMRI Resource Directory:
 - Abdominal -
 
(AUS) Abdominal ultrasound, (TAE) transabdominal echography, abdomen sonography, sonogram, (FAST) focused assessment
Ultrasonography is an ideal clinical tool for determining the source of abdominal pain. An abdominal ultrasound includes the liver, gallbladder, biliary tree, pancreas, spleen, kidneys and blood vessels of the abdomen. Conventional ultrasound is cheap, safe, non-invasive and is a practical first line investigation. High resolution ultrasound, endoscopic ultrasound and contrast enhanced Doppler techniques assist in detecting small lesions. The best preparation is nothing to eat or drink from midnight the night before the exam (minimum 8 hours).

Indications:
point abdominal pain;
point stones in the gallbladder or kidneys;
point inflammation;
point cancer, metastasis.

FAST is a rapid diagnostic test of the trauma patient that sequentially detects the presence of free fluid in pericardium (hemopericardium) and in 4 views of the abdomen. These views, the right upper quadrant (RUQ), left upper quadrant (LUQ), the subcostal, and suprapubic views detect a hemoperitoneum in patients with potential truncal injuries. The Morison pouch between the liver and right kidney (RUQ) is a space in which intraperitoneal fluid can accumulate. Emergency abdominal ultrasonography is indicated for the evaluation of aortic aneurysm, appendicitis, and biliary and renal colic, as well as blunt or penetrating abdominal trauma.
See also Pelvic Ultrasound, Pregnancy Ultrasound, Prostate Ultrasound and Pediatric Ultrasound.
Radiology-tip.comAbdomen CT
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Radiology-tip.comAbdominal Imaging
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• View the NEWS results for 'Abdominal Ultrasound' (1).Open this link in a new window.

• View the DATABASE results for 'Abdominal Ultrasound' (6).Open this link in a new window.

 Further Reading:
  Basics:
Starting Abdominal UltrasoundOpen this link in a new window
   by myweb.lsbu.ac.uk    
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    
Normal Anatomy of the Abdomen - UltrasoundsOpen this link in a new window
   by rad.usuhs.mil    
  News & More:
Optimizing Doppler and Color Flow US: Application to Hepatic Sonography(.pdf)Open this link in a new window
   by radiographics.rsna.org    
Renal Transplant Imaging and Intervention: Practical Aspects - 2Open this link in a new window
Tuesday, 11 August 1998   by www.radiology.co.uk    
Acute Appendicitis Diagnosed by UltrasoundOpen this link in a new window
   by rad.usuhs.mil    
Cirrhosis, Ultrasound findingsOpen this link in a new window
   by rad.usuhs.mil    
Absorbed DoseMRI Resource Directory:
 - UltraSound Physics -
 
In physics, the absorbed dose is the ultrasonic power absorbed per unit of mass of an object, and is measured in watts per kilogram (W/kg). The absorption increases with ultrasound intensity and frequency.
The thermal index describes the potential for heating of the patient's tissue due to the application of energy.
See also Thermal Effect, Ultrasound Safety, Ultrasound Regulations.
Radiology-tip.comRadiation Absorbed Dose
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Radiology-tip.comAbsorbed Dose
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• View the DATABASE results for 'Absorbed Dose' (4).Open this link in a new window.

 Further Reading:
  Basics:
Physics Tutorial: Ultrasound PhysicsOpen this link in a new window
   by www.physics247.com    
AbsorptionMRI Resource Directory:
 - UltraSound Physics -
 
Absorption is the transfer of energy from the ultrasound beam to the tissue. Absorption of acoustic energy increases the temperature of the tissue. This phenomenon, known as thermal radiation, has been used with some limited success to treat cancerous lesions in the breast and prostate gland. The absorption is proportional to the frequency.
See also Absorbed Dose, Thermal Effect, Thermotherapy.
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• View the DATABASE results for 'Absorption' (11).Open this link in a new window.

 Further Reading:
  Basics:
Physics Tutorial: Ultrasound PhysicsOpen this link in a new window
   by www.physics247.com    
  News & More:
ultrasound characteristics of breast cancerOpen this link in a new window
   by rad.usuhs.mil    
Ultrasound in diagnostic and therapyOpen this link in a new window
   by www.anst.uu.se    
US Resources  
Services and Supplies - - Portable UltraSound - Vaginal - UltraSound Physics - Societies
 
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