lesson 5 Flashcards
most common type used in medical settings. Provides two-dimensional grayscale
images of the internal structures ideal for pregnancy monitoring
2D ULTRASOUND
Ultrasound Machines)
extension of 3D technology that adds the dimension of time, creating real-time moving images.
4D ULTRASOUND
Uses the Doppler effect to visualize real-time blood flow. They can detect the speed and direction of blood flow within blood vessels
DOPPLER ULTRASOUND
use a probe inserted into the esophagus to obtain
detailed images of the heart’s structures
TRANSESOPHAGEAL ENDOCAVITARY
compact, lightweight, handheld devices with excellent mobility and flexibility. They are
commonly used in emergency departments,
PORTABLE ULTRASOUND
Combine ultrasound technology with an
endoscope to visualize internal structures in
the digestive tract
ENDOSCOPIC ULTRASOUND
into the patient and
Used during surgery to provide real-time imaging, aiding surgeons in identifying structures and guiding precise surgical
interventions.
INTRAOPERATIVE ULTRASOUND
Designed to assess blood vessels and blood flow patterns. They help diagnose vascular
diseases
VASCULAR ULTRASOUND
converts electric energy to mechanical energy,
and vice versa.
TRANSDUCER
brain behind an ultrasound machine. Coordinates the different signals emitted and received by the transducer, interpreting the
electrical signals in the form of a visual image
on the monitor
CPU (CENTRAL PROCESSING UNIT)
Shows the image of what the transducer is
scanning. Allows the doctor to analyze the
image before creating their diagnosis
DISPLAY (Monitor)
enable the sonographer to
adjust the settings for ultrasound scans to get
a clear picture on the display. Other functions
include zooming the picture in and out.
CONTROL KNOBS
Used during ultrasound scans to enter patient
data
KEYBOARD
special fine paper that is coated with a material
formulated to change color locally when exposed to heat.
Thermal paper
- The frequency spread of an ultrasound pulse.
- An important point to remember is that an ultrasound pulse consists of a range of frequencies, not a single frequency.
- For example, a pulse from a 5 MHz transducer could be composed of a range of frequencies from 4 MHz to 6 MHz. This range of frequencies is called BLANK
Bandwidth
- It indicates the number of ultrasound pulses emitted by the transducer over a designated period.
- Typically measured as pulses per second or Hertz (Hz)
PULSE REPETITION FREQUENCY (PRF)
quartz, Rochelle
salts, tourmaline
these are natural piezoelectric crystals
back of the element
Positive Electrode
front of the element
Ground Electrode
Adhered to the back of the crystal (behind the positive electrode). Absorbs ultrasound energy
directed backward and attenuates stray
ultrasound signals from the housing.
DAMPING (BACKING) BLOCK
Ultrasound transducers that produce images
via linear array typically contains BLANK, making them the largest assembly
256-512 elements
A Phased Array Ultrasound Transducer is typically 2-3 cm long, consisting of BLANK elements
64-128 elements
Used as a coupling medium in all ultrasound procedures to replace air between the transducer and the patient’s skin, as ultrasound waves have trouble traveling through air.
ULTRASOUND GEL
