Tissue Doppler echocardiography Tissue Doppler echocardiography Tissue Doppler echocardiography (TDE) is a medical ultrasound technology, specifically a form of echocardiography that measures the velocity of the heart muscle (myocardium) through the phases of one or more heartbeats by the Doppler effect (frequency shift) of the reflected ultrasound. The technique is the same as for flow Doppler echocardiography measuring flow velocities. Tissue signals, however, have higher amplitude and lower velocities, and the signals are extracted by using different filter and gain settings. The terms tissue Doppler imaging (TDI) and tissue velocity imaging (TVI) are usually synonymous with TDE because echocardiography is the main use
Human Tissue Authority and tissue from the living or the deceased for specified health-related purposes and public display. It also covers the removal of such material from the deceased. It lists the purposes for which consent is required (the "scheduled purposes"). The Act notably prohibited private individuals from covertly collecting biological samples, such as hair and fingernails, for DNA analysis, but excluded medical and criminal investigations from the offence. According to the Human Tissue Act, the HTA and its authority are governed by a code of conduct for the handling of human tissue, and the bodies of the deceased, but does not give