DMSU 101 Week 9 History

Discovered the pitch of a sound wave varies if the source of a sound wave is moving

States that a frequency shift is created when sound impinges upon a moving object

Real time 3D ultrasound

Which one is NOT the future of sonography

These crystals within the ultrasound transducer are referred to as

This is an example of what kind of image

2D ultrasound image display composed of bright dots representing the ultrasound echoes.

The form of energy that is produced when a vibrating source causes the molecules within a medium to move back and forth.

Identified that the angle of reflection equals the angle of incidence

Original Doppler probe. It's really just a very basic ultrasound transducer which only has 2 large PZT crystals.

Identified Pebble theory

Simplest type of ultrasound. A single transducer scans a line through the body with the echoes plotted on a screen

Specialties in ultrasound....

Invented the first practical ultrasonic testing method and apparatus

Real time imaging in that includes B-mode, color Doppler and spectral analysis at the same time

Borrowed a SONAR devise and adjusted the machine and recorded in A-mode , the first echo’sfrom Hertz’s heart

First imaged the lateral ventricles in the brain

Advanced the study of acoustics by understanding how bats use sound waves to detect their meal and guide their flight

This is an example of ...

Pulse wave Doppler where the freq shift is on the image, with flow to and away from the transducer as diff colors

Examines a line of Motion over time. In echocardiography it displays the movement of the myocardium

More sensitive than color Doppler for the detection of blood flow, but provides no info about the direction of flow

Process where a material such as a crystal within an ultrasound transducer, generates electricity and changes shape

Recognized that in order for sound to propagate there must be a medium through which the sound could travel

Sound was sent through water, bounced off an object, and then returned to the source. Location was shown on a monitor

The scientific study of sound and sound waves.

This is the propagation speed of sound thru soft tissue

Spectral Doppler refers to ultrasound modalities which yield graphical representations of flow velocity over time

Trans ultrasound to examine the heart on the other side of the body using a 2nd transducer to listen for returned echos

Transducer records tiny changes in the sound's pitch and direction. Signature waves are instantly measured and displayed

First to try and use the pulse wave theory in medical applications and to demonstrate the reflections from a gallstone

Are credited with the recognition of the Piezoelectric effect. Modern medical sonography is based on this discovery

Combination of simultaneously sounded musical notes to produce chords and chord progressions having a pleasing effect.

He was the first to measure the velocity of sound

Utilizes additional frequencies, other than the transmitted frequency ,in order to see higher resolution image

Used ultrasound to detect submarines ultimately leading to the development of SONAR. Sound Navigation and Ranging

▫You must have a ____ in order for sound to travel. Sound cannot travel in a vacuum.

This is an example of what kind of image

Refers specifically to the volume rendering of ultrasound data

Studied music and the harmonies and property of harmonics

Color and spectral Doppler both reveal the direction of blood flow which can be valuable information

Credited with the technology that led to the creation of the reflectoscope. This was used to detect flaws in metal

Real time imaging the includes both B-mode and Doppler at the same time

Uses Doppler effect to generate images of movement of tissues and body fluids, and their relative velocity to the probe.

This is an example of what kind of image