Term
| what is definition of parameters? |
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Definition
| describes the features of a sound wave |
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Term
| what is the source of a sound wave? |
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Definition
| ultrasound system and transducer |
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Term
| the tissue at which sound travels through is called what? |
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Definition
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Term
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Definition
| the time it takes a wave to vibrate a single cycle or the time from the start of one cycle to the start of the next cycle. |
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Term
| what are the units of period? |
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Definition
| seconds, ms (milliseconds), hours, days, ect. |
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Term
| can a sonographer change the period while using an ultrasound system with a particular transducer? |
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Definition
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Term
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Definition
| the number of particular events that occurs in a specific duratiion of time. or simply put, the number of cycles that occur in one second. |
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Term
| what are the units of frequency? |
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Definition
| units per second. ex: 1 cycle/second = 1 hertz (Ht). |
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Term
| another way to say Hertz as pertained to frequency is what? |
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Definition
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Term
| period is determined by the _______ only, not the medium. |
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Definition
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Term
| frequency of a sound wave is determined by the ___________only, not by the medium. |
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Definition
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Term
| can the sonographer change the frequency while using an ultrasound system and tranducer? |
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Definition
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Term
| sound waves less than 20Hz is called _____ |
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Definition
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Term
| sound waves between 20Hz and 20,000 Hz frequencies is called _________ |
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Definition
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Term
| sound waves of 20,000 Hz (20kHz) or higher is called__________ |
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Definition
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Term
| frequency is important to diagnostic sonography because it affects ____________ |
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Definition
| penetration and image quality |
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Term
| period and frequency are __________ related to each other |
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Definition
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Term
| if frequency increases, period __________ |
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Definition
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Term
| period X frequency = _________ |
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Definition
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Term
| a wave with the lowest frequency has the ___________ period. |
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Definition
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Term
| a wave with the shortest period has the ____________ frequency |
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Definition
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Term
| what are the parameters of magnitude? |
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Definition
| amplitude, power, intensity |
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Term
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Definition
| the difference between the maximun average and the average value as well as the difference between the minimun value and the average value. |
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Term
| can a sonographer control the amplitude on an ultrasound system? |
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Definition
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Term
| how is amplitude measured? |
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Definition
| fro the middle value (baseline) to the maximum value |
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Term
| how is peak-to-peak amplitude measured? |
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Definition
| the difference between maximum and minimum values. or twice the value of amplitude |
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Term
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Definition
| rate of energy is transferred or rate at which work is performed |
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Term
| what are the units of power? |
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Definition
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Term
| can a sonographer change the power of an ultrasound system. |
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Definition
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Term
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Definition
| the concentration of energy in a sound beam |
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Term
| what is the units for intensity? |
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Definition
| W/cm2 (watts per centimeters squared) |
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Term
| can a sonographer change the intensity of an ultrasound system? |
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Definition
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Term
| intensity is proportional/nonproportional to the power? |
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Definition
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Term
| in a wave's power is doubled, what happens to the intesity? |
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Definition
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Term
| in a wave's power is doubled, what happens to the intesity? |
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Definition
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Term
| if wave's power is quartered, what happens to the intensity? |
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Definition
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Term
| intensity is proportional to the a wave's amplitude squared? true or false |
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Definition
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Term
| if a wave's amplitude is doubled, the intensity increases by how much? |
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Definition
| four times its origianl value |
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Term
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Definition
| the distance or length of one complete cycle |
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Term
| wavelength is the only parameter that is determined by _________ |
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Definition
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Term
| the wavelength can/cannot be changed by the sonographer using an |
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Definition
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Term
| what two characteristics of a medium affect the speed of sound? |
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Definition
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Term
| _________ describes tha ability of an object to resist compressions. |
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Definition
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Term
| __________ describes the relative weight of a material. |
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Definition
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Term
| stiffness and speed are directly or inversly related to each other? |
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Definition
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Term
| density and speed are directly or inversely related to each other? |
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Definition
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Term
| material that are stiff but not dense will have a faster or slower speed? |
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Definition
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Term
| materials that are not stiff and very dense will have a faster or slower speed? |
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Definition
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Term
| when density increases, speed _________ |
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Definition
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Term
| when stiffness increases, speed ________ |
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Definition
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