Sonography Principles and Instrumentations (SPI) Examination Outline 2024 questions and answers.
3 mal angesehen 0 mal verkauft
Kurs
Sonography
Hochschule
Sonography
Sound
- a form of mechanical energy produced by vibrating objects that is transmitted by pressure waves through a medium
- needs a medium with particles to travel/propagate
- cannot travel in a vacuum (medium with no particles)
Mechanical Energy
- has to be transmitted
- propagate...
Sonography Principles and
Instrumentations (SPI)
Examination Outline 2024
questions and answers
\Sound
- a form of mechanical energy produced by vibrating objects that is
transmitted by pressure waves through a medium
- needs a medium with particles to travel/propagate
- cannot travel in a vacuum (medium with no particles)
Mechanical Energy
- has to be transmitted
- propagated from one point to another
- need a medium (can't propagate without a medium)
Cycle
- used to describe any changes in particle motion (particle
displacement, density, or molecules, pressure, and particle velocity)
that takes place at regular intervals
Acoustic Variables
- used to distinguish between sound waves and other types of
waves
FOUR Acoustic VARIABLES
- pressure
- density
- particle motion (distance and temperature)
Pressure (p)
,- concentration of force per unit of area (per unit meter squared)
- units: Pascals (Pa)
Density (ρ)
- concentration of mass in a volume
- unit: kilograms per centimeter cubed (kg/cm^3)
Density of Human Blood
- 1.05 g/mL of volume
Density of Water
- 1.0 g/mL of volume
Distance (d)
- measure of particle motion
- units: mm, cm, feet
Sound waves consist of..
- Compression
- Rarefraction
Compression
- regions of high pressure and density
- physical region of matter that has been disturbed due to elastic
distortion
- increases in any acoustic variables cause the sound waves to be
compressed
Rarefractions
- regions of low pressure and density
- decreases in any of the acoustic variables cause the sound waves
to be refracted
Transverse Wave
- particles move in a direction that is PERPENDICULAR (at right
angles) to the direction that the wave propagates
- example: ocean wave
Longitudinal Wave
,- particles move in the SAME DIRECTION/PARALLEL that the wave
propagates
- sound is a longitudinal wave form
- example: acoustic wave
The Nature of Sound
- only a LONGITUDINAL waveform that travels in a STRAIGHT line in
time and space
- cannot be transverse
Interference
- when waves lose their individual characteristics at that moment
and combines to form a single wave
In-Phase Interference
- constructive, 2 or more waves are combined to form one larger
wave
- a pair of waves when their peaks (maximum values) occur at the
same time and at the same location
- the troughs (minimum values) occur at the same time and place
Out-of-Phase Interference
- destructive, 2 or more waves are combined to form one smaller
wave
- their peaks occur at different times and places
Destructive Interference
, - the resultant wave is SMALLER than of its components (out-of-
phase waves)
Constructive Interference
- the resulting wave is LARGER than either of its components (in-
phase waves)
Acoustic Parameters
- describe features of a sound wave
- seven parameters are required to completely characterize a sound
wave
SEVEN Acoustic PARAMETERS
1. Period
2. Frequency
3. Amplitude
3. Intensity
5. Power
6. Wavelength
7. Propagation Speed
Period (T)
- 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
- units: microseconds
- typical value: 0.07-0.5 microseconds
- determined by the sound source ONLY
- CANNOT be changed by the sonographer
Frequency (f)
- the number of particular events that occur in a specific duration of
time; the NUMBER OF CYCLES (pressure oscillations)
occurring IN ONE UNIT OF TIME
- units: Hertz (Hz)
- typical value: 2MHz-15MHz (complimentary unit of hertz is seconds
and complimentary unit for kilohertz is a millisecond)
- determined by the sound source ONLY, not the medium through
which sound is traveling
Alle Vorteile der Zusammenfassungen von Stuvia auf einen Blick:
Garantiert gute Qualität durch Reviews
Stuvia Verkäufer haben mehr als 700.000 Zusammenfassungen beurteilt. Deshalb weißt du dass du das beste Dokument kaufst.
Schnell und einfach kaufen
Man bezahlt schnell und einfach mit iDeal, Kreditkarte oder Stuvia-Kredit für die Zusammenfassungen. Man braucht keine Mitgliedschaft.
Konzentration auf den Kern der Sache
Deine Mitstudenten schreiben die Zusammenfassungen. Deshalb enthalten die Zusammenfassungen immer aktuelle, zuverlässige und up-to-date Informationen. Damit kommst du schnell zum Kern der Sache.
Häufig gestellte Fragen
Was bekomme ich, wenn ich dieses Dokument kaufe?
Du erhältst eine PDF-Datei, die sofort nach dem Kauf verfügbar ist. Das gekaufte Dokument ist jederzeit, überall und unbegrenzt über dein Profil zugänglich.
Zufriedenheitsgarantie: Wie funktioniert das?
Unsere Zufriedenheitsgarantie sorgt dafür, dass du immer eine Lernunterlage findest, die zu dir passt. Du füllst ein Formular aus und unser Kundendienstteam kümmert sich um den Rest.
Wem kaufe ich diese Zusammenfassung ab?
Stuvia ist ein Marktplatz, du kaufst dieses Dokument also nicht von uns, sondern vom Verkäufer BRAINBOOSTERS. Stuvia erleichtert die Zahlung an den Verkäufer.
Werde ich an ein Abonnement gebunden sein?
Nein, du kaufst diese Zusammenfassung nur für 13,67 €. Du bist nach deinem Kauf an nichts gebunden.
