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  Indian J Med Microbiol
 

Figure 1: The denser a material is the more it reflects the sonographic waves. Fluid (like blood) transmits ultrasound waves and have minimum waves reflected back. This yields a black "an echogenic" image. Stones yield white images with a shadow behind them. Soft tissues (like the liver) yield different grey colour scales

Figure 1: The denser a material is the more it reflects the sonographic waves. Fluid (like blood) transmits ultrasound waves and have minimum waves reflected back. This yields a black