1 Most cases of malaria and most of the deaths caused by malaria occur in Africa.  Although most cases of malaria are caused by Plasmodium falciparum or P. vivax, P. falciparum accounts for almost all of the deaths caused by malaria.
For Echocardiography, color Doppler frame rates should be kept 17 Hz or above and preferably in the 20-30 Hz range. Every ultrasound machine has a numeric display of the current frame rate, which can range from less than 10 Hz to more than 60 Hz. Above: Image data area with FPS (Frames Per Second) and other adjustments.
In clinical practice, physicians often perform ultrasound for 30 minutes, but they typically move the probe around on the patient. In a quest to find the perfect 3D image of a developing child, however, others might hold the probe down in one spot for longer periods of time, increasing the risk of fetal damage.