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Tomographic X-rays
THE BIONIC EAR
Amber, Daniella & Sam
WHY WE CHOSE THIS PROGRAM?
THE BIONIC EAR Tomographic X-rays Amber, Daniella & Sam WHY WE - - PowerPoint PPT Presentation
THE BIONIC EAR Tomographic X-rays Amber, Daniella & Sam WHY WE - - PowerPoint PPT Presentation
THE BIONIC EAR Tomographic X-rays Amber, Daniella & Sam WHY WE CHOSE THIS PROGRAM? WHAT WE DID DURING WORK EXPERIENCE Took a series of x-rays (of rat cochlea) and made 3D reconstruction Went to the Australian Synchrotron tour
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WHAT WE DID DURING WORK EXPERIENCE
- Took a series of x-rays (of rat cochlea) and made 3D reconstruction
- Went to the Australian Synchrotron – tour & experiment (with lasers)
- Melbourne University – Bionic Eye institute (tour of labs and presentation)
- Research about Cochlear implant – how tomographic results helps research
in that area
- Presentation & Article
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HOW HEARING WORKS
- Sound passes through the outer ear and onto the ear
drum.
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HOW HEARING WORKS
- Sound passes through the outer ear and onto the ear
drum.
- The sound/vibration is amplified by the bones in the
middle ear.
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HOW HEARING WORKS
- Sound passes through the outer ear and onto the ear
drum.
- The sound/vibration is amplified by the bones in the
middle ear.
- The liquid inside the inner ear because of the vibrations
moves over sensory cells.
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HOW HEARING WORKS
- Sound passes through the outer ear and onto the ear
drum.
- The sound/vibration is amplified by the bones in the
middle ear.
- The liquid inside the inner ear because of the vibrations
moves over sensory cells.
- These sensory cells send electrical impulses to the
brain via the auditory nerve.
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THE EAR
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DEAFNESS
- Defined as a loss of hearing.
- Related to the volume and pitch or
frequency of sound that a person can perceive.
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DEAFNESS
- More than one form of deafness
- Conductive Hearing loss
- Neural hearing loss
- Mixed hearing loss
- Noise Induced Hearing loss
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COCHLEA
- The auditory portion of the inner ear.
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COCHLEA
- The auditory portion of the inner ear.
- Made up of two main parts, Organ of Corti
and the cochlear duct.
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COCHLEA
- The auditory portion of the inner ear.
- Made up of two main parts, Organ of Corti
and the cochlear duct.
- Filled with liquid which flows over tiny hairs
to produce electrical signals which are sent to the brain.
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THE COCHLEAR IMPLANT
- Invented by Graeme Clark in 1978
- Helps people with impaired hearing
- Provide hearing to those that have damage to the
sensory hairs in their cochlea
- Sounds such as foot steps, and music are heard
differently as the implant only picks up a limited amount
- f frequencies.
- Newer devices allow for a wider range of frequencies to
be picked up.
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MICROPHONE
- Microphone: Used to pick up sound from its
surroundings.
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SPEECH PROCESSOR
- Speed Processor: Translates the auditory
input into electrical impulses.
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TRANSMITTER
- Transmitter: Transmits the electrical
impulses to the electrodes in the cochlea.
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ELECTRODE ARRAY
- Electrode Array: Picks up the electrical
signals and sends them to the brain via the auditory nerve.
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WHY A COCHLEAR IMPLANT?
- Rather than pick up sound and amplify it
the cochlear implant picks up the signal and transmits it directly to the cochlear, bypassing dysfunctional areas of the ear.
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COCHLEAR IMPLANT VS. HEARING AID
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BENEFITS
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X-RAYS
- Electromagnetic radiation of short wave
lengths.
- Produced when electrons collide with a
solid target → lab based source.
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SYNCHROTRON
- Produces x-rays from high speed electrons.
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TOMOGRAPHY
- -Uses X-ray images taken from different
angles
- -the 2D images are then used to produce a
3D reconstruction of the sample
- -the model can be cut and the inside of the
sample can be viewed
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RESULTS
X-RAY PROJECTION
- 90°
- 45°
0° 45° 90°
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3D TOMOGRAPHIC RECONSTRUCTION
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COCHLEA – WITHOUT IMPLANT
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COCHLEA – WITH IMPLANT
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THE COCHLE