Term
| If frequency increases, the spatial pulse length___ |
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Definition
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Term
| Spatial pulse length is__ |
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Definition
| wavelength x number of cycles in pulse |
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Term
| Spatial pulse length is the product of__ |
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Definition
| wavelength and cycles per pulse |
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Term
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Definition
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Term
| Pulse A is from a 5 MHz transducer and pulse B is from a 10 MHz transducer. Both pulses have 4 cycles per pulse. |
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Definition
| pulse A will have a greater SPL |
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Term
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Definition
| the pulse transmit or "on" time plus the pulse listening or "off" time. |
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Term
| The number of pulses occurring in 1 sec is called the___ |
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Definition
| pulse repetition frequency |
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Term
| If the PRF increases, the PRP__ |
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Definition
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Term
| (True or False). Pulse repetition period is the reciprocal of pulse duration |
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Definition
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Term
| The range of PRF used in diagnostic ultrasound is__ |
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Definition
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Term
| If the depth of view increases, the PRF___ |
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Definition
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Term
| When you change the PRF you are changing__ |
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Definition
| the number of pulses per second |
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Term
| Duty factor is determined by__ |
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Definition
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Term
| What is the value of the duty cycle for continuous wave (CW)U/S? |
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Definition
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Term
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Definition
| source of the sound waves/transducer |
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Term
| If the PRF decreases, the duty factor__ |
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Definition
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Term
| Duty factor can be changed by the sonographer. |
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Definition
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Term
| In CW U/S, which of the following are the same? |
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Definition
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Term
| The units for duty factor are__ |
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Definition
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Term
| Which is the highest intensity? |
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Definition
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Term
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Definition
| The beam intensity across the area being scanned |
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Term
| The beam uniformity coefficient describes__ |
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Definition
| the spread of a beam in space (SP/SA factor) |
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Term
| Pulse duration is equal to___ |
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Definition
| period x number of cycles in pulse |
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Term
| If the depth of view increases, the pulse duration___ |
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Definition
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Term
| What happens to SPL if depth of view increases using the same transducer? |
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Definition
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Term
| If you increase the depth of view from 2cm to 3cm, the SPL__ |
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Definition
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Term
| PRP and PRF can be changed by___ |
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Definition
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Term
| Two waves can have identical pulse repetition frequencies, even if their frequencies are different. |
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Definition
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Term
| Duty factor depends on the frequency of the transducer. |
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Definition
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Term
| The PRF of a 5 MHz transducer is greater than the PRF of a 2.5 MHz transducer. |
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Definition
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Term
| In pulsed ultrasound, the maximum value of the duty factor is__ |
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Definition
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Term
| When the SPL increases, the duty factor__ |
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Definition
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Term
| Two pulses are created by different transducers and both have the same frequency, the pulse containing more cycles has__ |
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Definition
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Term
| What are the units of intensity? |
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Definition
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Term
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Definition
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Term
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Definition
| the beam intensity during the transmitting time |
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Term
| The spatial intensity is usually highest at__ |
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Definition
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Term
| Intensities are important because___ |
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Definition
| Bioeffects on the tissue being scanned |
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Term
| Pulse duration is determined by__ |
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Definition
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Term
| Power divided by beam areas is equal to___ |
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Definition
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Term
| The units of pulse duration are units of____ |
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Definition
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