Ultrasound is the ideal tool to examine children of all ages. It is fast, painless, uses no ionizing radiation, and does not require a baby to remain still for long periods. Real-time modes show movement of internal tissues and organs. Advanced ultrasound imaging techniques such as color Doppler, 4D ultrasound, harmonic imaging, and higher resolution, as well as the application of ultrasound contrast agents broaden the potential of ultrasound.
Pediatric [paediatric, Brit.] ultrasound can be used in all body regions and reduce the number of more invasive or radiating examinations that often additionally need sedation or intravenous iodinated contrast agents.

See also Fetal Ultrasound, Reflux Sonography, Ultrasound Safety, Abdominal Ultrasound and Pregnancy Ultrasound.

Higher frequencies are attenuated by tissue more than lower frequencies. This means that the higher the frequency the lower the depth of penetration but the greater the resolution.
Harmonic imaging allows the use of a lower frequency pulse to be picked up and sampled at the second harmonic (higher frequency) where the low frequency allows greater penetration and high frequency provides better resolution.

See also Skinline.

Power modulation is a non-linear method, based on a multi-pulse technique where the acoustic amplitude (and hence power) of the transmitted pulses is changed. Full and half amplitudes pulses are used to induce changes in the response of the contrast agent. The received echoes from the emitted half amplitude pulse are adjusted with the full amplitude pulse and this pairs of pulses are subtracted. Power modulation is used to separate contrast agent echoes at low mechanical index, allowing real-time perfusion imaging.
Power modulation can be used with a low frequency wide band transducer to increase the depth and transmit the sound beam homogenous allowing ultraharmonic imaging.

From Medison Co.,Ltd.;
'Full-featured Digital Imaging On Your Desktop
The SONOACE PICO is a full-featured digital color ultrasound system with virtually all the imaging capabilities you would expect from a cart-based system with the added benefit of being fully portable. Built on a reliable Linux PC platform, the SONOACE PICO boasts all- digital beamforming and signal processing for best-in-class image resolution enhanced by a long list of advanced diagnostic tools such as harmonic imaging, color and power Doppler, and freehand 3D imaging.'

From Siemens Medical Systems;
'The SONOLINE G20™ ultrasound system quickly distances itself from the competition with next-generation all-digital system architecture that utilizes Siemens technology migration. Individual imaging parameters have been optimized for a wide variety of clinical applications and patient types. So you can realize a higher degree of diagnostic confidence. Without doubt.'