145. answers the following question: are the reflections on the

145. answers the following question: are the reflections on the image created from structures directly in the imaging plane or from structures that lie above or beneath the image plane? a. Axial resolution b. Lateral resolution C Elevetional resolution d. Temporal resolution 146. True or false? The electronics within the ultrasound system that create beam steering and focusing patterns is called the beam former. a True b. False 147. All the following is related to grating lobes except: a. Created by array transducers b. Degraded axial resolution c. It is weaker than the beam’s main axis d. Apodization and subdicing are used to reduce grating lobe’s strength 148. The intensity of a signal declines from 8 mW/cm2 to 2 mW/cm2 . How many decibels is this change in intensity? a. 3 dB b. -3 dB C. 6 dB d -6 dB 149. What are the requirements for the refraction: a. Oblique incidence and different impedance of two media b Oblique incidence and different propagation speed of two media c. Normal incidence and different impedance of two media d. Normal incidence and different propagation speed of two media 150. As a pulse passes through soft tissue, a certain amount of acoustic energy remains in the tissue as heat. What is this constituent of attenuateon called? a. scattering b, absorption c. refraction d. Rarefaction

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