The presentation is meant for senior secondary physics or A Level physics students

1. ULTRASOUND AS PART
OF MEDICAL PHYSICS AT
SCHOOL LEVEL
Dr Lalit Kishore

2. Production of ultrasound
Diagram for visual
reading
Quartz crystal
Voltage alternates,
crystal vibrates,
produces ultrasound
Pizo-electric effect
PATTERN POEM

3. Applied physics for ultrasound
diagnostic
Natural frequency of
quartz crystal =
Supplied alternative
voltage =>
RESONANCE or
Ultra Sound with
max. amplitude or
energy
Transducer set-up Working principle

4. Working principle of ultra-sound
machine
 Electrical pulses /
signals > ultrasound
 Reflected and
ultrasound sensed >
electrical signal >
CRO / digital image
on monitor screen
 Condition of tissues
diagnosed
Quartz crystal as transducer
and sensor Working principle

5. Machine diagram
 Crystal microphone
 Screen to display
ultrasound image
 Alternative voltage
generator
 Frequency tunner
Diagram of ultrasound
machine
Parts

6. Formula for intensity: Diagnostic
measurements for precision
 Exponential curve
 Transmission
percentage
vs
 Thickness of
absorbing medium
Tables available for
matching transmitted
intensity with
thickness of tissue
Measurement coefficient Attributes

7. Ray diagram for US transmission
through absorbing material
 US intensity ratio
measure

8. RECAP: Working of US machine