Week 9 - Notes (Axial imaging) Flashcards Preview

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Flashcards in Week 9 - Notes (Axial imaging) Deck (23)
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1
Q

What is ultrasound?

A

Reflection of sound waves

2
Q

Magnetic Resonance Image

Physics

A

Gold standard for imaging brain & spinal cord

Pt is subjected to magnetic field

Magnet puts tissues in order

Radio frequency coil disrupts order

Scanner scans image produced by change in molecular energy

Creates slices of images

3
Q

MRI veterinary equipment

A

MRI = Magnetic Resonance Imaging

Open-sided (claustrophobic) scanners

Special buildings need to house MRI units

4
Q

Special restraint for MRI

A
5
Q

MRI images produced

A

“Anatomical likeness”

MRI of canine brain

6
Q

Helical CAT scans

A

Tube spins

7
Q

When to use CAT scan or MRI?

A

Stroke => CAT scan

Brain tumor => MRI (more definition)

8
Q

Mobile CAT scan units

A

Continuous radiation = PPE a must!

Not as expensive as MRI

9
Q

CAT

A

Computerized Axial Tomography

Lion Scan

Slices are taken

10
Q

Veterinary CAT imaging

A
11
Q

CAT images provide detail and contrast

A
12
Q

Veterinary Thermography

A

Heat-sensitive camera

Company creating these cameras = FLIR - Forward Looking InfraRed

13
Q

Veterinary Therapy Lasers

A

(Surgical lasers = destroy tissue)

Therapy lasers - common (low power)

Drive light (diff. colors) through tissue

Helps cells heal better

Stimulate fibroblasts

Increase blood supply

Operator needs to wear protective glasses (can blind you)

Laser purchase cost about $500

14
Q

MoA of Therapy Laser

A

Box w/light probe

Things to look for when purchasing a laser:

Power output & frequency of light (=color; common is red/orange)

15
Q

Shock Wave Therapy

Lithotripsy

A

Transcutaneous “Injection” of Targeted Sound Pressure Waves

Machine is not cheap

Pressure is measured in bars

Transcutaneous (=w/jelly through skin into tissue)

Cavitation => negative pressure/tissue is decompressed

16
Q

MoA of Lithotripsy

A

Kidney stones

17
Q

Human Application of Shock Wave Therapy

A

Shoulder pain

18
Q

Equine/Canine Shock Wave Therapy

A

Transducer changes electrical energy into sound energy

Comes with foot pedal

Horse ailments that can be treated with this:

  • Navicular
  • Suspensory ligament
  • Bursitis
19
Q

Equine Shock Wave Therapy

A

Pulse waves of high pressure sound

  • many times more energetic than U/S

Pressure & Cavitation areas develop

  • these stimulate neoangiogenesis and analgesia

Application areas

  • bone and Fx healing
  • Tendons and Suspensory Ligament tears
  • Navicular bone inflammatory disorders

Animals nn to be sedated or under GA

Good evidence of efficacy

20
Q

Equine Tendons and Ligaments

A

Enemy of transmission of shock wave is air

=

Need coupling gel

21
Q

Define neoangiogenesis

A

New BV formation

22
Q

Canine Extra Corporeal (outside of body) Shock Wave Therapy

A

e.g. Achilles tendon rupture, bisipital tendinitis

23
Q

Equine Gamma Scintigraphy

A

Gamma cameras take pics of gamma radiation

Radioactive isotopes (e.g. i131, Strongium, Tektonium) are given IV

Isotopes distribute in bloodstream, go to tissue where it gets stuck/collects and shows up on films

Can detect bone cancer this way

Metabolized by body and washed out

Better than MRI in certain situations

PPE critically important