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A B-mode scan is taken of the object shown on the left (see figure below) with a

ID: 174003 • Letter: A

Question

A B-mode scan is taken of the object shown on the left (see figure below) with a linear array. There are four tissue components, A and B with a boundary in-between and two spherical tumors C and D. Given the corresponding ultrasound image shown on the right, what can you deduce about the acoustic characteristics of components A, B, C and D? (muti choice)

A.Since the boundary between a and b is visible, Za?Zb

B. Since tumour d is not visible, Zb=Zd.

C. Since tumour c is visible, Zc?Zb.

D. Since tumour c is elongated, cc<cb.

a c

Explanation / Answer

In the above given ultra sound image, the tumors are represented as A, B, C and D and there is boundary line drawn between A and B. The transducer elements of ultra sound waves are arranged linearly and the ultra sound beams passed into tissues pass the perpendicular to the components. Therefore, the boundary lione between A and B is visible. Thus, Option A is correct.

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