Ultrasound Flashcards
is a mechanical wave propagated through a medium at a high frequency to produce images of structures within the human body.
Ultrasound
The ultrasound waves are generated by the application of electrical current to
piezoelectric crystals in the US transducer (probe).
Piezoelectric effect:
Phenomenon where distortion of a crystal causes an electrical change.
The lower frequency probes are used for
deep abdominal imaging while
higher
Fluids Ultrasound
always reflects BLACK images on US.
Tissue Ultrasound are colored what
Tissue is always a shade of GRAY on the image.
The denser the tissue Ultrasound
the brighter white it will appear with brightest white
being bone.
Regulates the amplification (brightness) of returning echoes to compensate for loss of transmitted sound caused by absorption and reflection.
Gain: Ultrasound
relative term that refers to the echoes returned from a structure. refers to a lesion or tumor which produces a stronger echo thanthe surrounding structures or tissues.
Hyperechoic: Ultrasound
Refers to structures that contain fewer or weaker echoes than surrounding tissues. Ultrasound
Hypoechoic: Ultrasound
Ability to distinguish between two adjacent structures
(interfaces). Ultrasound
Resolution: Ultrasound
An electromechanical device that is part of an ultrasound
system. The device that contacts the patient and converts electrical energy
into mechanical energy and vice versa.
Transducer: Ultrasound
This doppler: Typically, most machines utilize
-red color to indicate flow going _____the probe
-blue color to indicate flow going ____from the probe.
Color Doppler: Ultrasound
Red: TOWARD
Blue: Away
Are used for abdominal and obstetric imaging.
Curvilinear probes:
Are used for soft tissue and small parts imaging. Ultrasound
Linear probes:
