ULTRASOUND PRELIM 1

From handout

Lazzaro Spallanzani (Italy)

• Demonstrated that bats navigate using sound waves (echolocation).

• Provided the first scientific insight into how high-frequency sound can locate objects

  • An early conceptual root of ultrasound

1794

In what year did Lazzaro Spallanzani demonstrate echolocation in bats?

Pierre and Jacques Curie (France)

Who discovered the piezoelectric effect, a principle still used in ultrasound transducers?

Piezoelectric effect

What discovery allows crystals to convert electrical energy into sound waves and vice versa?

• A principle still used in ultrasound transducers?

1880

In what year was the piezoelectric effect discovered?

Paul Langevin (France)

Who developed sonar and the hydrophone during World War I to detect submarines?

Sonar and hydrophone

The development of _______________ during WWI marked the first major technological step toward medical ultrasound

1914–1918 - World War I

When was sonar and hydrophone technology developed?

Karl Theodore Dussik - Neurologist

Friedrich Dussik - Physicist

(Austria)

Who published the first known medical ultrasound appications?

Brain

What body part did the Dussik brothers attempt to visualize using ultrasound?

• This is considered the earliest true medical ultrasound research

1942

In what year did the Dussik brothers publish their medical ultrasound research?

Inge Edler and Carl Hellmuth Hertz (Sweden)

Who recorded the first moving images of the heart using an industrial flaw detector?

M-mode echocardiography

What ultrasound mode was used to record the first moving images of the heart?

Echocardiography

The work of Edler and Hertz established ________________ as a diagnostic technique.

Industrial flaw detector

Inge Edler and Carl Hellmuth Hertz used an ______________ to record the first moving images of the heart (M-mode echocardiography).

1953

in what year was the first ultrasound of the moving heart recorded?

Professor Ian Donald (Scotland)

Who is known as the “Father of Obstetric Ultrasound”?

Obstetrics and gynecology

Which field did Ian Donald pioneer using ultrasound?

• Conducted systematic tissue experiments

• Introduces fetal measurements

What did Professor Ian Donald do to earn the title “Father of Obstetric Ultrasound”

Mid-1950s

When did Professor Ian Donald pioneer the use of ultrasound in obstetrics and gynecology?

George Kossoff, David Robinson, and Team (Australia)

Who developed grayscale imaging which improved clarity and diagnostic accuracy in ultrasound?

Late 1950s–1960s

When was grayscale imaging developed?

Octoson

The Australian team led by Kossoff and Robinson created machines like the __________ and refined scanning techniques.

James Willocks and Stuart Campbell (UK)

Who advanced obstetric ultrasound by developing standardized fetal measurement techniques and growth charts?

Standardized fetal measurement techniques and growth charts

What did Willocks and Campbell develop to advance obstetric ultrasound?

1960s

In which decade were standardized fetal measurements and growth charts introduced in obstetric ultrasound?

Vidoson

What ultrasound system introduced the first real-time moving images?

• The first system to show continuous, real-time moving images.

1967

In what year was real-time ultrasound imaging (Vidoson) introduced?

Cardiology and obstetrics

The first real-time imaging (Vidoson) revolutionized ultrasound use in?

1970s–1980s

During what decades did Doppler and High-Resolution Advances occur?

Doppler and High-Resolution Advances

Introduction of Pulsed Doppler, Color Doppler, and improved transducer materials.

Pulsed Doppler and Color Doppler

Allows clinicians to measure blood flow and diagnose vascular conditions.

Pulsed Doppler

Which Doppler technique allows measurement of blood flow velocity?

Color Doppler

What Doppler advancement displays blood flow using color coding?

Digital Era

• The shift from analog to digital ultrasound machines

• Dramatically improves image quality, portability, data storage, and ease of use.

1980s–1990s

What decades did the transition from analog to digital systems occur?

Modern Innovations

• Growth of 3D/4D imaging, elastography, contrast-enhanced ultrasound, and ultra-portable handheld devices.

• Expands ultrasound use into emergency medicine, critical care, oncology, and remote healthcare

2000s–Present

What decades did the Modern Innovations on ultrasound occur?

• Emergency medicine

• Critical care

• Oncology

• Remote healthcare

Ultra-portable, handheld devices expands ultrasound use into?

3D/4D imaging

The growth of __________ provides volumetric data and life-like anatomical views.

Elastography

What modern ultrasound technique evaluates tissue stiffness?

Obstetrics and Gynecology

• Monitor fetal growth and wellbeing

• Determine gestational age

• Detect multiple pregnancies

• Screen for certain birth abnormalities

Cardiology (Echocardiography)

• Assess heart chambers and valves

• Check pumping function

• Diagnose heart disease

Vascular Medicine

• Uses Doppler ultrasound to measure blood flow

• Detects blockages, narrowing, and clots (e.g., DVT)

Abdominal Imaging

• Examines the liver, gallbladder, pancreas, spleen, and kidneys

• Diagnose pain, swelling, or organ abnormalities

Interventional Procedures

Real-time guidance for biopsies, fluid drainage, injections, and catheter placement

Therapeutic Applications

HIFU uses focused energy to non-invasively destroy targeted tissue, like tumors or fibroids, by heating it to ablative temperatures.

High-Intensity Focused Ultrasound (HIFU)

Non-invasively destroys targeted tissue (e.g.,tumors, fibroids) using focused energy

• Obstetrics and Gynecology

• Cardiology (Echocardiography)

• Vascular Medicine

• Abdominal Imaging

• Interventional Procedures

• Therapeutic Applications

Clinical Applications of Ultrasonography

• Thermal effects (Heating)

• Mechanical Effects (Cavitation)

The Biological Effects of Ultrasound are governed by these mechanisms:

Thermal effects (Heating)

Tissues absorb sound energy, causing molecules to vibrate—this produces heat.

Very small temperature rise

What level of temperature increase is produced by diagnostic ultrasound?

Safe for routine use

Due to it minimal thermal heating, diagnostic ultrasound is considered?

65–75°C

Therapeutic Ultrasound (HIFU):

• Focused energy can raise temperatures to ___________, destroying unwanted tissue through thermal ablation while sparing surrounding structures.

Thermal ablation

Therapeutic Ultrasound (HIFU):

• Focused energy can raise temperatures to 65–75°C, destroying unwanted tissue through _____________ while sparing surrounding structures.

Surrounding structures

HIFU destroys unwanted tissue through thermal ablation while sparing what?

Cavitation

What mechanical biological effect of ultrasound involves gas bubble activity?

Tiny gas bubbles

Cavitation is caused by the formation or movement of what within tissues or fluids?

Stable Cavitation

Bubbles gently oscillate

• Can temporarily make cell membranes more permeable (sonoporation) to enhance drug or gene delivery.

Inertial Cavitation

Bubbles collapse violently

• Can mechanically break down targeted tissue

• Used in some therapeutic applications.

Cell membrane

Stable cavitation can temporarily increase permeability of what structure?

Sonoporation

The increased cell membrane permeability due to ultrasound?