http://www.echocardiographer.net/blog/technical-qa/questions-on-echocardiography-technique-and-interpretation.php Just another WordPress weblog Wed, 02 Jun 2010 20:40:17 +0000 http://wordpress.org/?v=2.9.1 hourly 1 http://www.echocardiographer.net/blog/technical-qa/questions-on-echocardiography-technique-and-interpretation.php/comment-page-1#comment-2882 kevin Tue, 26 Jan 2010 09:02:38 +0000 http://www.echocardiographer.net/blog/?p=6#comment-2882 Boring old physics time I'm afraid. Gain has two types, overall and Timed gain compression or TGC. Firstly the difference is that gain use amplifies the sent and received ultrasound signal to pull the 2D image up into a black / white interface on the monitor screen ; compression takes that data and "squeezes" it to increase or decrease the greyness of the white areas (myocardium). In most cases, good manipulation of gain controls - both overall and TGC should enhance the interface between the endocardium and the ventricular cavity sufficiently for a modified Simpson's biplane EF% trace and likewise for stress imaging. In difficult cases, picking the best harmonic frequency setting for the Patient and then manipulation of the compression (usually decreasing compression) will almost always define the endocardium better. Please also remember that many of the most modern machines don't even have a knob to perform this as they automatically decide best harmonic, compress and persist settings anyway. Hope this helps :-) Boring old physics time I’m afraid. Gain has two types, overall and Timed gain compression or TGC. Firstly the difference is that gain use amplifies the sent and received ultrasound signal to pull the 2D image up into a black / white interface on the monitor screen ; compression takes that data and “squeezes” it to increase or decrease the greyness of the white areas (myocardium).
In most cases, good manipulation of gain controls – both overall and TGC should enhance the interface between the endocardium and the ventricular cavity sufficiently for a modified Simpson’s biplane EF% trace and likewise for stress imaging. In difficult cases, picking the best harmonic frequency setting for the Patient and then manipulation of the compression (usually decreasing compression) will almost always define the endocardium better. Please also remember that many of the most modern machines don’t even have a knob to perform this as they automatically decide best harmonic, compress and persist settings anyway. Hope this helps

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