7 Appendix: Quantity- / Unit Symbols and Important Constants

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291

Name of Quantity

Symbol

Domain / Value

Unit

Unitsymbol

Volume

V

ℝ

cubicmeter

m³

Wave vector

k

ℝ

1/meter

1/m

Potentials on the left and

right arm and foot

ΦL, ΦR, ΦF

ℝ

Volt

V

Lead voltages according

to Einthoven

VI, VII, VIII

ℝ

Volt

V

Lead voltages according

to Goldberger

aVL, aVR, aVF

ℝ

Volt

V

Lead voltages according

to Wilson

V1 bis V6

ℝ

Volt

V

Potential matrix on the

heart surface

S

ℝ

Volt

V

Potential matrix on the

body surface

Φ

ℝ

Volt

V

Transfer matrix

A

ℝ

dimensionless none

chapter 4

Sampling time

Ta

ℝ

second

s

Sampling frequency

fa

ℝ

Hertz

Hz

Bandwidth

fB

ℝ

Hertz

Hz

Time constant

τ

ℝ

second

s

Input resistance

RE

ℝ

Ohm

Ω

Cut-off frequency

fg

ℝ

Hertz

Hz

Group delay

Tg

ℝ

second

s

Magnetic flux

Φ

ℝ

Tesla ⋅m²

T ⋅m²

Magnetic induction

B

ℝ

Tesla

T

Temperature

T

ℝ

Kelvin

K

Magnetic permeability in

vacuum

μ0

4π ⋅10⁻⁷

Volt ⋅second

Ampere ⋅m

Vs/Am

Oxygen saturation

SpO2

ℝ

percent

%

chapter 5

Sampling instance

ta

ℝ

second

s

Sampling interval

Ta

ℝ

second

s

Sampling frequency

fa

ℝ

Hertz

Hz

Amplitude of a signal

A

ℝ

Width of a sampling

interval

∆T

ℝ

second

s

Frequency resolution

∆f

ℝ

Hertz

Hz

Continuous signal

f(t)

ℝ

Fourier-transform of f(t)

F(f)

ℂ

Discrete signal

f(n)

ℝ