[PPT]Ultrasound Lecture 1 - Nc State...
Transcript of [PPT]Ultrasound Lecture 1 - Nc State...
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Ultrasonography:Where to start?
Tony Pease, DVM, MSAssistant Professor of RadiologyNorth Carolina State University
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Reading
Chapter 4 in Nyland/Mattoon
orChapter 2 in Thrall
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RELAX!
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Objectives
• Machine• Terminology• Examination
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Examination
• Image orients like a radiograph
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Ultrasound Pitfalls
• Technical demand on time and patience• Non-specific change
– Tissue characterization yet to be realized• Opening Pandora’s Box
– Multiple abnormalities but you may not known the clinical importance
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Fatal assumptions
• Speed of sound is an average– 1540 m/sec
• All sound waves are assumed to be created by a primary beam
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Ultrasound Knobs
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Power vs. Gain
• Power = preprocessing– Controls energy given to the transducer to
regulate intensity of the sound wave• Gain = post-processing
– Increases the overall brightness given to the returning signal
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Power Gain
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Time Gain Compensation
• Also called TGC• Will adjust gain at different depths• Helps make the image uniform
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Time Gain Compensation
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Beam and focal spots
Nyland, Small Animal Diagnostic Ultrasound
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Focal Spot
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Tissue Harmonics
• Ultrasound wave goes in– 5 MHZ
• Transducer listens for a higher frequency– 10 MHz– This is generated by the tissue imaged
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Harmonics Benefit
• Only goes through tissue once– Less artifacts
• Penetrates better than 10 MHz– But not as good as a 5 MHz wave
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Without With Harmonics Harmonics
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Types of probes
Phased array
Linear array
Curvilinear
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How does it work?
Nyland, Small Animal Diagnostic Ultrasound
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What about MHz?
• Generally 1-13 MHz• Multiple frequencies in one probe
– 1-4 MHz– 5-8 MHz
• Higher number = better resolution• Decreased penetration
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Bottom line
• For canine abdomen– Average size dog
• Use a 5-8 MHz probe– Deep-chested dog
• Use a 3-5 MHz probe
• For feline abdomen– Can use 10-12 MHz probe
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Terms
• Hyperechoic• Hypoechoic• Isoechoic• Anechoic
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Hypoechoic to hyperechoic
1. Bile, urine2. Muscle3. Renal medulla4. Renal cortex5. Liver6. Fat7. Spleen
8. Prostate9. Renal sinus10. Vessel walls11. Bone, gas
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Everything’s relative
• Echogenicity is a comparison
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Examination
• Abdomen– No set protocol
• Thorax– Echocardiograph
• Lateral
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Abdominal Ultrasound
• Patient preparation– Clip or alcohol– Acoustic coupling gel
• Appropriate probe selection (MHz)• Image optimization takes time• May need to switch transducers or
change frequencies
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Abdomen
• Dorsal recumbency– Clockwise exam
• Lateral recumbency– Organ approach
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Ultimate goal
• Examine all organ systems• Examine in a routine fashion
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Liver/Gallbladder
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Liver
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Where we are
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Stomach (dog)
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Stomach (cat)
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Left limb of pancreas
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Spleen
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Left kidney
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Adrenal gland
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Variability of adrenal glands
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Canine left adrenal gland
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Feline left adrenal gland
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Aorta
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Aorta
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Urinary Bladder
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Medial iliac lymph node
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Right kidney
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Right adrenal gland - Dog
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Right adrenal gland - Cat
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Right limb of pancreas
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Mesenteric lymph nodes
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Small intestine and colon
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Intestinal layering
• Superficial to deep– Serosal = White– Muscularis = Black– Submucosal = White– Mucosal (thickest) = Black– Mucosal-luminal interface = White
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Uterus
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Pregnancy
• Can see heart beat around 21 days• Can see limb buds by 32 days• Check for viability
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Other uses
• Brain imaging• Laryngeal exam• Guided aspirates• Contrast studies• Thyroid gland• Ocular exam• Blood flow• Umbilicus
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Ultrasound guided techniques
• Needle approximate 45 degree angle• Use appropriate needle length for target• Be mindful of surrounding vessels
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Cystocentesis
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Fine needle aspirate
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