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Twinkling Artifact on Color Doppler echocardiography and its dependence on Ultrasound force
| Content Provider | Semantic Scholar |
|---|---|
| Author | Honarbakhsh, Abbass Hajjam, Arash Behnam, Hamid Rakhshan, Hamed Khatami, Abdolhosein |
| Copyright Year | 2010 |
| Abstract | In 1996, Twinkling artifact was described by Rahmouni et al; as an artifact generated by a strongly reflecting medium. This artifact is not restricted to flow or movement. Present knowledge of twinkling artifact is limited, and the artifact has not been well characterized. Its cause has only been speculated. In order to examine the already made theories and give a theory of our own, we made some practical experiments using the sonography device. The tests were done on Renal stones and artificially generated stones in order to visualize the artifact and to obtain positive results. The experiments were divided into two main categories; Power Color Doppler and TCD probe experiments. The theory which we imply is that Vibro-acoustography effect, also known as the radiation force which is generated by a change in the energy density of an incident acoustic field has a direct effect on the production of this artifact. APower Color Doppler experiments The devices used were Toshiba Super SG140A and ATYS medical TCD respectively. Renal Stones with different sizes and chemical contents were first placed in a special Gel material and then put in a bowl of water. After stabilization of the content in the bowl, we started the experiment using 5-7MHz Linear array probes. Every time we applied the test on the stones, we wrote and registered the Physical and chemical parameters such as the size and roughness. We also took into account the distance of the stones from the probe. In this experiment the Twinkling artifact was present in all stones. In experiments using the TCD probe, again the Twinkling artifact was seen in all occasions. When the sample volume was placed inside the gel only, the probe did not show any flow, whereas when the sample volume was chosen on the location of the stone the TCD probe showed a clear flow. BConclusion Previous investigation implied that the Twinkling Artifact depends on a lot of physical parameters, which most of them were approved after the experiments. Also in some previous investigations they thought that this artifact was due a problem in the device design which they named as jitter noise. However we can now consider the Radiation force as the main factor which seems to have the most direct effect on the production of this artifact. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.engr.du.edu/nemslab/arash_files/conferencePDF/4-Radiology-seminar.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
