By Steven M. Penny
Introducing a fantastic source for college kids and sonographers getting ready to sit down for the Sonography ideas and Instrumentation (SPI) exam provided through the ARDMS (American Registry for Diagnostic scientific Sonography) sonography credential granting association. a story type examination overview, this source is perfect for ultrasound courses requiring a certification evaluation guide for both a assessment direction or to be used through the curriculum, in addition to for any specialist getting ready for certification. With content material in line with present examination codecs, this ebook might help scholars establish strengths, examine and triumph over weaknesses, and ace the attempt. The spouse site contains a web examination simulation, with 1000's of extra questions, in response to the content material define of the Sonography rules and Instrumentation provided by means of the ARDMS.
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Extra info for Examination Review for Ultrasound: Sonographic Principles & Instrumentation (SPI)
Spatial pulse length d. Propagation speed 29. The prefix “centi” denotes: a. Thousandths b. Hundredths c. Millions d. Hundreds 30. If the angle of incidence is 40Њ, what is the angle of transmission at the interface if medium 1 has a propagation speed of 1320 m/s and medium 2 has a propagation speed of 1700 m/s? a. Ͻ40Њ b. Ͼ40Њ c. 40Њ d. Cannot tell the angle of transmission 31. The change in the direction of the original sound wave that occurs when sound interacts with two different tissue types that have a different propagation speed is referred to as: a.
This is referred to as an array. An array is formed by taking a single slab of PZT and slicing it down into multiple subelements. Each subelement is connected to a wire, so it may fire independently (Figure 2-7). The system can selectively excite the elements as needed to shape and steer the beam. With most array transducers, no motors are needed for beam steering. Arrays may be either sequenced or phased and can produce various image shapes. Linear Sequenced Array The linear sequenced array, also referred to as the linear sequential array or linear array, is a transducer that is often used in vascular or small parts imaging (Figure 2-13).
However, it is not the resolution of the image that is being referred to when the word “quality factor” is used, but the purity of the beam. ” Formula Q-factor ϭ Fo Bandwidth 11378_ch02 19/10/10 4:47 PM Page 41 C H A P T E R 2 | U LT R A S O U N D T R A N S D U C E R S Damping Pulse length 41 Bandwidth FIGURE 2-11 Quality factor (Q-factor). Continuous-wave probes are not damped, so they have a high Q-factor (A). With pulse-wave probes (B,C), the more damping there is (signified by the gray boxes within the transducers shown in B & C), the shorter the pulse, and therefore, the wider the bandwidth and lower the Q-factor.