1. To conclude
This textbook aims to acquaint students and those interested in the field of use of technology in medicine with the elementary principles of operation of devices and tools based on the use of various wave phenomena.
In addition to the basic principles, this publication lists and explains some simple applications encountered in the field of biomedicine. However, modern science and technology provide many new sophisticated technical tools that go beyond the scope of this textbook. These are mainly devices of radiology and nuclear medicine. These are also applications of wave processes but in conjunction with sophisticated computational methods that require a more detailed explanation. These are mainly acoustic and optical imaging methods, USG, thermography, tomographic imaging methods, such as CT, MRI, PET, SPECT, and other methodologies, which use radioactive radiation in therapy and diagnostics. The description of these advanced methods will be the content of the prepared book - Technical means of biomedical engineering.
The present textbook uses basic knowledge of mathematics and physics. Special medical applications are going out of the personal experience of authors and current books and journals. Part of the information and most of the documentary images are from publicly available and freely usable Internet sources.
List of used symbols
voltage transmission (−)
complex voltage transmission (−)
oscillation damping coefficient (s−1)
magnetic induction (T)
phase velocity (m∙s−1), speed of light (m∙s−1)
speed of light in free space (
capacitance (F)
electric displacement (C∙m−2)
elementary charge (
electron-volt unit (1 eV = 1,602,177 × 10−19 J)
electromagnetic field energy density (J∙m−3)
energy (J, eV), e.g.,
illuminance (lx)
electric field strength (V∙m−1)
frequency (Hz), focal length (m)
Larmor frequency (Hz)
force vector (N)
gravity acceleration (m∙s−2)
Planck’s constant (
loudness level (Ph – phon, dB)
magnetic field strength (A∙m−1)
electric current (A)
phasor of electric current (A)
rms value of electric current (A), luminous intensity (cd)
power density of wave (radiation) (W∙m−2),
imaginary unit (j = √−1)
current density (A∙m−2)
complex wave number (m−1)
length (m)
inductance (H), luminance (cd∙m−2)
angular momentum (N∙m∙s)
mass (kg)
magnetic dipole moment (N∙m∙T−1)
torque (N∙m)
refractive index (−)
pressure (Pa), power density (W∙m−3)
acoustic pressure (Pa)
linear momentum (kg∙m∙s−1)
power (W), active power (W)
electric charge (C), quality factor (−), reactive power (Var)
radius (m), distance (m)
wave reflection factor (−)
position vector (m)
electrical resistance (Ω)
apparent power (VA), area (m2)
complex power of the alternating current (VA)
time (s)
wave transition factor (−)
period (s), thermodynamic temperature (K)
voltage (V), acoustic displacement (m)
rms value of electric voltage (V)
voltage phasor (V)
velocity vector (m∙s−1)
volume (m3)
work (J)
amplitude of oscillations (m)
coordinate (m), axis designation, displacement in the
coordinate (m), axis designation
coordinate (m), axis designation
impedance, wave impedance (Ω)
complex impedance (Ω)
wavenumber (m−1), angle (rad),
wave attenuation coefficient (m−1), angle (rad)
effective wave propagation length (m), wave penetration depth (m)
conductivity (S∙m−1), gyromagnetic ratio (s−1∙T−1)
electric permittivity (F∙m−1), strain (−)
electric permittivity of free space (
relative permittivity (−)
wavelength (m)
plane angle (rad), phase shift (rad)
bulk density (kg∙m−3), electric charge density (C∙m−3)
magnetic permeability (H∙m−1)
permeability of free space (
relative permeability (−)
Poynting vector (W∙m−2)
time constant (s)
mechanical stress in shear (Pa)
mechanical tensile stress (Pa)
magnetic flux (Wb), luminous flux (lm)
radiation flux density (W∙m−2)
angular frequency (s−1), angular velocity (rad∙s−1)
Larmor angular frequency (s−1)
angular frequency of forced oscillations (s−1), solid angle (sr)
designation of the first derivative by time
designation of the second derivative by time
designation of a scalar quantity
designation of a vector quantity
designation of a complex quantity
Abbreviations
detection chip (Charge-Coupled Device)
detection chip (Complementary Metal Oxide Semiconductor)
subtractive colour composition (Cyan-Magenta-Yellow-Black)
Carbon Nano Tubes
Computed Tomography
electromagnetic
magnetic resonance signal (Free Induction Decay)
Infra-Red
Light Amplification by Stimulated Emission of Radiation
Liquid Crystals Display
Light Emitting Diode
Magnetic Resonance
Magnetic Resonance Imaging
Magnetic Resonance Spectroscopy
Micro-Waves
Photo-Acoustic Microscopy
Positron Emission Tomography
additive colour composition (Red-Green-Blue)
Radiofrequency, Radio-Waves
Single Photon Emission Tomography
Ultrasonography
Ultra-Violet
Ultra-High Frequency
Very Short Waves
wireless connection (Wireless Fidelity)
Visible Light
X-rays (Roentgen radiation)
gamma radiation
two-, three-dimensional