Physics-Dynamic Range/Hemodynamics

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Author:
aprilh4485
ID:
117193
Filename:
Physics-Dynamic Range/Hemodynamics
Updated:
2011-11-16 15:44:48
Tags:
Sonography
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Description:
Dynamic Range/Hemodynamics
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  1. A range from 1 volt to 100 volts can be processed accurately by the display of an ultrasound system. What is the dynamic range of the display?
    40 dB
  2. A component of an ultrasound system can properly process voltages ranging from 1 mV to 1 V. What is the dynamic range?
    • 60 dB
    • 1/0.001 = 1000
  3. A component of an ultrasound system can properly process voltages ranging from 5 V to 5000 V. What is the dynamic range?
    60 dB
  4. An amplifier increases a voltage form 0.2 to 2000 volts. How many decibels of gain is this?
    80 dB
  5. An amplifier increases voltage from 5 to 500 volts. How many decibels of gain is this?
    40 dB
  6. An uncompressed signal within the receiver of an ultrasound system has a dynamic range of 110 dB. The signal undergoes 40 dB of compression. What is the dynamic range of the compressed signal?
    70 dB
  7. An uncompressed signal has a dynamic range of 85 dB. The signal undergoes 30 dB of compression. What is the dynamic range of the compressed signal?
    55 dB
  8. After compression, a signal within the ultrasound system has a dynamic range of 70 dB. The original signal was compressed by 40 dB. What is the dynamic range of the original, uncompressed signal?
    110 dB
  9. A signal within a system's receiver has a dynamic range of 60 dB after compression. The original signal was compressd by 50 dB. What is the dynamic range of the origninal, uncompressed signal?
    110 dB
  10. The arterial blood pressure measured in an artery of the arm of a patient who is supine is 140 mmHg. What is the hydrostatic pressure at all locations within the arterial circulation?
    with supine individuals, 0 mmHg
  11. The arterial blood pressure measured in an artery of the arm of a patient who is supine is 140 mmHg. What is the arterial pressure at the knee of the supine patient?
    140 mmHg
  12. The arterial blood pressure measured in an artery of the arm of a patient who is supine is 140 mmHg. What is the arterial pressure in the carotid artery of the neck of the supine patient?
    140 mmHg
  13. The arterial blood pressure generated by the heart in a patient who is standing upright is 140 mmHg. What is the hydrostatic pressure at all locations within the arterial circulation?
    • below heart level- positive and range from 50 to 100 mmHg
    • above heart level- negative
  14. The arterial blood pressure generated by the heart in a patient who is standing upright is 140 mmHg. What is the arterial pressure measured in the toe of the upright patient?
    • 240 mmHg
    • since toe is far away from heart, hydrostatic pressure is 100 mmHg.
    • 100 mmHg + 140 mmHg = 240 mmHg
  15. The arterial blood pressure generated by the heart in a patient who is standing upright is 140 mmHg. What is the arterial pressure measured at this patients knee?
    • 215 mmHg.
    • hydrostatic pressure is 75 mmHg
    • 75 mmHg + 140 mmHg = 215 mmHg
  16. The arterial blood pressure generated by the heart in a patient who is standing upright is 140 mmHg. What is the arterial pressure measured at the standing patients waist?
    • 190 mmHg
    • hydrostatic pressure is 50 mmHg.
    • 50 mmHg + 140 mmHg = 190 mmHg
  17. The arterial blood pressure generated by the heart in a patient who is standing upright is 140 mmHg. what is the arterial pressure measured at the standing patient's upper arm?
    • 140 mmHg
    • hydrostatic pressure is 0 mmHg
    • 0 mmHg + 140 mmHg = 140 mmHg
  18. The arterial blood pressure generated by the heart in a patient who is standing upright is 140 mmHg. What is the arterial pressure at the finger when the patient fully extends an arm toward the sky?
    • 90 mmHg
    • hydrostatic pressure is -50 mmHg
    • -50 mmHg + 140 mmHg = 90 mmHg
  19. Normally, what happens to venous flow in the legs during inspiration?
    decreases venous flow in legs
  20. All of the following occur during expiration except:
    A. venous return to the heart decreases
    B. venous flow in the legs increases
    C. abdominal pressure increases
    D. the diaphragm rises into the thorasic cavity
    C. abdominal pressure increases
  21. What is the arterial pressure in the carotid artery of the neck of the supine patient?
    120 mmHg

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