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DC Field | Value | Language |
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dc.contributor.author | Vassallo, Pierre | - |
dc.date.accessioned | 2016-10-10T09:58:19Z | - |
dc.date.available | 2016-10-10T09:58:19Z | - |
dc.date.issued | 2011 | - |
dc.identifier.citation | Vassallo, P. (2011). What is Doppler ultrasound?. The Synapse, (3), 25-27 | en_GB |
dc.identifier.uri | https://www.um.edu.mt/library/oar//handle/123456789/12735 | - |
dc.description.abstract | The term Doppler should be capitalized because it refers to Christian Johann Doppler, an Austrian physicist (1803–1853). He described a phenomenon whereby the frequency of sound changes when it is reflected off a moving object. If the object is moving towards the observer, reflected sound frequency is increased (blue shift), while if the reflecting object is moving away from the observer, the sound frequency decreases (red shift). This is analogous to a moving ambulance with its siren on; the siren pitch increases as ambulance approaches and decreases as it receeds. The Doppler Effect may be used also in ultrasound. With normal grey scale ultrasound we rely on amplitude of reflected sound waves and the reflectivity of anatomic structures is proportional to the intensity (or amplitude) of the reflected sound and hence brightness on the scanner display. If frequency (rather than amplitude) is analysed, one can detect motion on the basis of Doppler shifts. These frequency shifts can be quantified reasonably accurately according to direction, velocity and also acceleration, all of which provide specific signatures that help identify both normal and diseased blood vessels. | en_GB |
dc.language.iso | en | en_GB |
dc.publisher | Medical Portals Ltd. | en_GB |
dc.rights | info:eu-repo/semantics/openAccess | en_GB |
dc.subject | Doppler ultrasonography | en_GB |
dc.subject | Diagnostic ultrasonic imaging | en_GB |
dc.subject | Ultrasonic Diagnosis -- Methods | en_GB |
dc.title | What is Doppler ultrasound? | en_GB |
dc.type | article | en_GB |
dc.rights.holder | The copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder. | en_GB |
dc.description.reviewed | peer-reviewed | en_GB |
Appears in Collections: | The Synapse, Issue 3 The Synapse, Issue 3 |
Files in This Item:
File | Description | Size | Format | |
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What is Doppler ultrasound.pdf | 356.65 kB | Adobe PDF | View/Open |
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