suppleringsbilder for webster kap. 1
DESCRIPTION
FYS 4250. Suppleringsbilder for Webster kap. 1. Medisinsk instrumentering, intensivovervåking. Operasjonsstue. U = 5 volt U er størrelsen (quantity) 5 er måltallet [volt] er enheten (unit) Eksempler på ikke SI-enheter: bar, psi, inch, yard, grader Fahrenheit, miles, gallon. - PowerPoint PPT PresentationTRANSCRIPT
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Suppleringsbilder for
Webster kap. 1
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Medisinsk instrumentering, intensivovervåking
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Operasjonsstue
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Måle-enheter, SI system
U = 5 volt
U er størrelsen (quantity)
5 er måltallet
[volt] er enheten (unit)
Eksempler på ikke SI-enheter: bar, psi, inch, yard, grader Fahrenheit, miles, gallon
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O utput
Input
O utput
Input
(a) (b)
(a) A linear system fits the equation y = mx + b. (b) A nonlinear system does not fit the straight
line.
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O utput
Input
O utput
Input
(a) (b)
(a)The one-point calibration may miss nonlinearity. (b)The two-point calibration may also miss nonlinearity.
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Sensors ignal
M easurand
A hysteresis loop The output curve obtained when increasing the measurand is different
from the output obtained when decreasing the measurand.
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(a) (b)
Presisjon, (a) lav, (b) høy
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Nøyaktighet (accuracy): (a) lav, (b) høy
(a) (b)
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Servosløyfe
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Dynamisk system
Den medisinske variable som skal måles varierer vanligvis som funksjon av tid.
Et måleinstruments statiske og dynamiske karakteristikk kan beskrives med en differential-likning, vanligvis begrenset til 2.orden slik:
a2d2y/dt2 + a1dy/dt + a0y(t) = b2d2x/dt2 +b1dx/dt + b0y(t)
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2.ordens system, blodtrykksmåling
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Suppleringsbilder for
Webster kap. 3
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3 nyttige regler for å skjønne op.amp kretser
En op.amp brukes alltid med tilbakekopling.
Når op.ampen opererer i sitt lineære område, er spenningen mellom inngangene lik null.
Inngangene er strømløse, og forsterkningen svært høy.
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0.05 H z 150 H z
Frequency
A m plitude
1.0
0.1
Frequency response of an electrocardiograph.
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Suppleringsbilder for
Webster kap. 4
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Strøm-dipolen
H = iL
J = E
v = H . r / r
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EKGelektroder
1905
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Elektrode-hud
impedans
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Støy fra elektroder
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Bevegelses-artefakter
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Einthoven triangel
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Augmented leads
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Unipolare bryst-
avledninger
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Skjerming, Faraday’s
bur
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Begrenset båndbredde
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Suppleringsbilder for
Webster kap. 11
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Kromatografisøyle
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Suppleringsbilder for
Webster kap. 12
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Kognitive prosesser, bildetolkning
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Kant-effekt
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Gjenkjennelse
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Gjenkjennelse 2
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Compton-spredning
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Røntgenrør
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Modulasjonsoverføringsfunksjon
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Årsaker til bildeuskarphet
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Subtraksjonsbilde
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Bildeforsterker, flatskjerm
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Angio
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Dødelig dose
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Veggbucky
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C-bue
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CT1, 2. og 3. generasjon
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Bilde-rekonstruksjon
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EIT
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EIT
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Elektrisk bioimpedans tomografi (EIT)
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MRI
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T1 måling
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T2 måling
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3D rekonstru
ksjon
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MRI parametre
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Intervensjons-MR
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Loddrett hovedfelt
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Isotoper
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Isotoper
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Strålefelt, piezoelektrisk skive
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Sidelober
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Dempning, piezo-
elektrisk skive
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UL, feilkilder (1)
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UL, feilkilder (2)
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Ultralyd feilkilder (3,4,5)
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UL 3D transducer
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Fargedoppler
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Suppleringsbilder for
Webster kap. 13
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Sykehusorganisering, sterilområder
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Sterilt område
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Intensivavdeling, sterile soner
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Pacemakerplassering
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Defibrillering
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Hemodialyse
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Peritoneal dialyse
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Hjerte-lunge
maskin
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Kunstig hjerte,
Jarvik-7
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Servo-ventilator
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Narkoseapparat
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Pasientsystem gjeninnånding
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Kuvøser
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Kirurgisk diatermi
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Lysabsorpsjon i vann
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Fysisk institutt - Rikshospitalet90
Minimal-invasiv kirurgi
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Fysisk institutt - Rikshospitalet91
Suppleringsbilder for
Webster kap. 14
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Fysisk institutt - Rikshospitalet92
4-leder (norske) og 5-leder (europeiske) elnettsystem
Fra ”Medisinsk-teknisk sikkerhet på sykehus” av Grimnes & Jensen (2003)