.png){kind=logo}
ARDMS SPI 500 EXAM NEWEST ACTUAL / WITH
QUESTIONS AND ANSWERS.
The symbol for wavelength is - ----Answers----lambda
The wavelength of a 5 MHz probe in soft tissue is - ---- Answers----0.3 mm
As frequency increases, wavelength (assume same medium) - ----Answers----decreases The percentage of sound energy reflected at a soft tissue/air interface is approx - ----Answers----50%
A reflector that is smooth surfaced and large is called - ---- Answers----specular
examples of specular reflectors - ----Answers----mitral valve, interventricular septum, carotid artery
Specular reflectors are highly dependent on - ----Answers--- -incident angle
Reflectors that are rough surfaced and small are known as - - ---Answers----scatter
- / 2
Scatter reflectors are highly dependent on - ----Answers---- transmit frequecy
The strength of backscatter is dependent upon - ----Answers- ---density, size, impedance
Reflectors that reflect ultrasound energy equally in all directions are called - ----Answers----Rayleigh
The best example of a scatter reflector is (the) - ----Answers- ---organ parenchyma
The best example of of a Rayleigh scatter is the - ---- Answers----red blood cell
The ultrasound beam strikes an interface at 90 degrees. The incidence is considered - ----Answers----perpendicular
The optimal angle to strike specular reflectors are - ---- Answers----direct
The reflected intensity coefficient may be calculated by the formula - ----Answers----[Z2-Z1/Z2+Z1]2
The ultrasound beam strikes an interface at 74 degrees. This incidence is considered - ----Answers----oblique
- / 2
.png)