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# FYS 4250 - PowerPoint PPT Presentation

FYS 4250. Biomedical instrumentation. Chapt 1: Basic concepts of medical instrumentation. Medical instrumentation, intensive care unit. Operating room. Approaches. Physicians Physicists, engineers Researcher Patients Functions: diagnostic, therapeutic, support Invasive / non-invasive

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Presentation Transcript

Biomedical instrumentation

Chapt 1: Basic concepts of medical instrumentation

Fysisk institutt - Rikshospitalet

Fysisk institutt - Rikshospitalet

Fysisk institutt - Rikshospitalet

• Physicians

• Physicists, engineers

• Researcher

• Patients

• Functions: diagnostic, therapeutic, support

• Invasive / non-invasive

• Technology: electromagnetic, optical, mecanical

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U = 5 volt

U is the quantity

5 is the dimension figure

[volt] is the unit

Examples of non SI-units: bar, psi, inch, yard, degrees Fahrenheit, miles, gallon

Fysisk institutt - Rikshospitalet

Fysisk institutt - Rikshospitalet

Fysisk institutt - Rikshospitalet

Fysisk institutt - Rikshospitalet

Fysisk institutt - Rikshospitalet

Eq.1.3

y = output xd = desired input Gd = gain Hf = part of y back to input

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• Sensitivity high → high true positive

• Specificity high → high true negative

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(a)

(b)

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(a)

(b)

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The output curve obtained when increasing the measurand is different from the output obtained when decreasing the measurand.

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(a)

(b)

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(a)

(b)

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Drifting

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Fysisk institutt - Rikshospitalet

The medical variable to be measured will normally vary as a function of time

The statical and dynamical properties of a measurement instrument can be described with a differeintial equation, usually limited to a 2. order like:

a2d2y/dt2 +a1dy/dt+ a0y(t) = b2d2x/dt2 +b1dx/dt + b0x(t)

input x(t), output y(t)

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Fysisk institutt - Rikshospitalet

Fysisk institutt - Rikshospitalet

2.order system,two energy storing elements, swinging system

Fysisk institutt - Rikshospitalet

Fysisk institutt - Rikshospitalet

How to

Design, construct

Produce, market

Medical equipment

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