Usg diplay modes

Different types of modes.....in Ultrasound.

1. ULTRASOUND DISPLAY MODES Ripan 2 nd Sem M.Sc.MIT

2. INTRODUCTION Ultrasound is an imaging method that uses high-frequency sound waves to produce images of structures within our body. The ultrasonic image is an electronic representation of data generated from returning echoes and displayed on a monitor.

3. DISPLAY MODES Ultrasound imaging, different modes are used to examine the different parts of our body. The different types of modes can be controlled by the operator . These are follows: A MODE M MODE B MODE

4. A MODE Amplitude modulation. Is the display of amplitude spikes of different heights. It represents the time required for the ultrasound beam to strike a tissue interface and return its signal to the transducer. The greater the reflection at the tissue interface, the larger the signal amplitude on the A-mode screen.

5. Consists of a x and y axis, X represents the depth and y represents the Amplitude Depth Amplitude

6. APPLICATIONS A mode is used in ophthalmology, echoencephalography and echocardiology . Used as an adjunct to B mode displays when accurate depth measurements are required.

7. DISADVANTAGES No memory is built Discards previous pulses as it receives new ones Permanent record made by photographing the electronic display

8. M MODE Motion Mode is also called Time Motion or TM-Mode. I s the display of a one-dimensional image that is used for analyzing moving body parts. Spikes are converted into dots. The single sound beam is transmitted and the reflected echoes are displayed as dots This mode allows to trace motion

9. Cnt ... Varying intensities thus creating lines across the screen.

10. ADVANTAGES:- It is most useful in echocardiography and fetal cardiac imaging. DISADVANTAGES:- Only one dimension is represented Short time that can be recorded

11. B MODE B-mode means Brightness mode. Display of the 2D map. Display echo signal are electrically converted to intensity modulated dots on the screen. Brightness depends upon the amplitude or intensity of the echo. The B mode produces a picture of a slice of a tissue . B mode display is used both in generating M-mode trace and in gray scale.

12. ADVANTAGES Large field of view obtained

13. GRAY SCALE IMAGING B-mode took a major step forward with the advert of gray scale imaging in 1972. Display the great variation of the amplitudes of the echoes arising from tissues as varying shades of gray on a monitor. It was made by the development of scan conversion memory tube called scan converter.

14. BONE               TISSUE                        FLUID

15. REAL TIME SCANNER Real Time imaging systems are those that have frame rates fast enough to allow movement to be followed. It can produce multiple frames in a very short time, typically10 frames per second. This allows movement to be viewed in “real time” as the images are generated.

16. REFFERENCE Christensen’s Physics of Diagnostic Radiology. Essentials of ultrasound physics.