In power mode the amplitude (power) of color Doppler signals is displayed, regardless of the velocity. Power does not have negative values and is independent of sampling frequency. An aliasing artifact does not occur in power mode images. Caused by plotting the quantity enhanced by echo contrast agents in a power map, power mode is often used in contrast Doppler ultrasound examinations.
Also known as energy mode.

Printers can be used to capture a hard copy of the image from the display of the ultrasound machine.

Quadrature detection is used in Doppler ultrasound as well as in magnetic resonance imaging and is also called quadrature demodulation or phase quadrature technique. Quadrature detection is the acquisition of Mx and My simultaneously as a function of time by using two separate detector channels. This signal processing method is used for directional Doppler in which the signal reference frequency for the two channels has a phase shift of 1/4 period. The output Doppler signal phase for both channels also depends on the Doppler shift whether positive or negative.
The fast Fourier transform analyzer performs spectral Doppler analysis in ultrasound machines and displays different quadrature Doppler frequencies, when a sample volume cursor is used along time.

Real-time mode has been developed to present motion like a movie of the body's inner workings, showing this information at a high rate. The special real-time transducer uses a larger sound beam than for A, B or M-modes. A linear array transducer with multiple crystal elements displays real-time compound B-mode images with up to 100 images per second.
At each scan line, one sound pulse is transmitted and all echoes from the surface to the deepest range are received. Then the ultrasound beam moves on to the next scan line position where pulse transmission and echo recording are repeated.

See also Compound B-Mode, Pulse Inversion Doppler, and Frame Averaging.

From Siemens Medical Systems;
'This extremely flexible system supports targeted applications for OB/GYN, Radiology, Internal Medicine, Urology, and Prostate Brachytherapy. The large transducer selection, most with high-frequency capabilities, provides the right tool for general imaging, radiology, and internal medicine applications.'