Orthopedic Radiology - files.bridgeport.edu · Magnetic Resonance Imaging (MRI) Fat is very high in...
Transcript of Orthopedic Radiology - files.bridgeport.edu · Magnetic Resonance Imaging (MRI) Fat is very high in...
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Orthopedic Radiology
Dr. Terence A. Perrault D.C., D.A.C.B.R.
Professor of Clinical Sciences
University of Bridgeport
College of Chiropractic
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Diagnostic Imaging Modalities
Dr. Terence A. Perrault D.C., D.A.C.B.R.
Director of Radiology
University of Bridgeport College of Chiropractic
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Plain film radiographyUtilizes ionizing radiation to penetrate organic matter
Xrays are simply EM radiation of higher intensity/energy than visible light (Shorter wavelength, higher frequency)
Casts shadow of dense structures on a film
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Plain film radiography
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Plain film radiography
Recognizes only 5 densities:
Air (Gas)
Fat
Water
Bone (Calcium)
Metallic
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Plain film radiography
Need mixture of all 4 physiologic densities to get diagnostic film.
Metallic density degrades image (in most cases)
Need minimum of 2 views at 90 degrees to each other for localization of structures.
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Plain film radiography
Patient 1
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Plain film radiography
Patient 1
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Plain film radiography
Patient 2
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Plain film radiography
Patient 3
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Plain film radiography
Patient 4
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Plain film radiography
Advantages:
Availability
Quick imaging
Relatively inexpensive
Good screening tool
Disadvantages:
Ionizing radiation
Insensitivity
Shows only structure
Poor tissue differentiation
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Contrast radiography
Metallic density degrades images In most cases
Contrast material (barium or iodine based) often used to opacify tubular structures for visualization
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Contrast radiography
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Patient #3
Patient 3
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Contrast radiography
Patient 3
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Computed Tomography
Utilizes xray beam (ionizing radiation)
Encircles patient with xray beam and radiation detectors measure attenuation of beam.
Gives cross sectional images of the region of interest
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Computed Tomography
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Computed Tomography
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Computed Tomography All images are digital
and stored in computer
This digital information can be manipulated later to enhance certain tissues
Creates bone and soft tissue “windows”
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Computed Tomography Image
reconstruction
Digital grids can be reconstructed in many planes
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Computed Tomography Imaging
reconstruction via computer reformatting can produce images in multiple planes
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Computed Tomography
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Computed Tomography
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Computed Tomography
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Computed Tomography
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Computed Tomography
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Computed Tomography
Bone window Gas window
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Patient #1
Patient 1
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Computed Tomography
Patient 1
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Computed Tomography
“Star” defect resulting from metallic artifact
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Patient #3
Patient 3
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Computed Tomography
Patient 3
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Computed Tomography Advantages:
Highly sensitive
Quick acquisition times
Lung / G.I. Imaging
Available
Disadvantages:
Ionizing radiation
Soft tissue differentiation not as good as MRI
Relative cost
Structure not function
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Magnetic Resonance Imaging(MRI)
Fat is very high in free hydrogen and gives off a very high signal
Muscle gives off varying amounts of signal based upon various physiologic properties
Bone, tendons, and ligaments have hydrogen bound in crystalline-like lattice and unable to be manipulated by RF,.. No signal
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Magnetic Resonance Imaging
Alterations of free hydrogen (water) content in tissues affect their ability to “relax” from
RF pulse and re-align into the main magnetic field
These relaxations are designated T1 and T2
Each tissue has different values for T1 & T2 relaxation
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Magnetic Resonance Imaging Bone, tendons and ligaments
Have hydrogen bound into crystalline-like lattice
Unable to manipulate with magnetic fields or RF pulses
Therefore no signal given off
Appears black on images
Flowing blood also does not give an image “Flow void” more about this later…,
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MR Imaging Parameters
Type TR (msec)
TE (msec)
CSF FAT
T1 weighted
Short (400-800)
Short (20-25)
Dark Bright
T2 weighted
Long (1500-2000)
Long (>60)
Bright Less Bright
PD Intermed
Long(1500-3000)
Medium (30-50)
Gray Gray
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Magnetic Resonance Manipulation
T1-weighted Lumbar spine T2-weighted Lumbar spine
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Magnetic Resonance Imaging
2 Major types of MR scanners
Air core (closed)
Solid Core (open)
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Magnetic resonance imagers
Air core (closed MR unit)
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Magnetic resonance imagers
Solid Core (Open MR unit)
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Patient #1
Patient 1
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Magnetic Resonance Imaging
Artifact resultingFrom metallic Fragment distortingMagnetic field
Patient 1
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Magnetic Resonance Imaging Artifact
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Patient 2 This is the plain film
xray from earlier in the lecture
Did you see any injuries
Patient 2
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Magnetic resonance imaging
Patient 2
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Magnetic resonance imaging
Patient 3
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Magnetic resonance imaging
Patient 4
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Magnetic resonance imaging
Advantages:
No ionizing radiationExcellent soft tissue demonstrationVery sensitize to tissue changesShows structure AND function
Disadvantages:
Slow acquisition timesExpensiveAvailabilityUncomfortableClaustrophobicMagnetic shielding problemsHeavy machinery
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Magnetic Resonance Imagingwith Fat Saturation
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Magnetic Resonance Imagingwith Flexion/Extension
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MRI pulse sequences
Collection of specific imaging parameters selected for a scan of a patient
Typical musculoskeletal exam contains 3-6 sequences in various planes
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Pulse Sequence Strengths & WeaknessesSequence Strength Weakness
Spin Echo T1Anatomic detail, Fat, Subacute Hemorrhage, Marrow, Menicus,
Contrast
ST edema, other fluid
Fast Spin Echo T2
Marrow path when fat-sat. used, Good for pts with metal hardware,
Fluid
Poor marrow w/o fat-sat
Gradient Echo T2*Fibrocartilage, Loose bodies & Hemorrhage(susceptibility effects)
Poor marrow, metallic hardware
Short Tau Inversion recovery
(STIR)
Marrow & ST Pathology d/t fat suppression
Not to be used with contrast
Fluid Attenuation Inversion Recovery
(FLAIR)
Similar to STIR mostly for Brain and Neuro tissues
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Magnetic Resonance Arteriography (MRA)
Utilizing the “flow void” of blood to produce an image.
It is possible via the software to digitally eliminate the signal of most/all tissues with exception of flowing blood
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Magnetic Resonance Arteriography (MRA)
This will produce the appearance of only the vascular structures and any abnormalities
The images appear as if contrast material was injected without the invasiveness of arteriography
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Flow Void
Antenna
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Flow Void
Antenna
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Flow Voids
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Magnetic Resonance Arteriography (MRA)
Utilizing the “flow void” to produce an image
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Magnetic Resonance Arteriography (MRA)
Middle aged male patient with chronic, progressive neck pain and no response to treatment
Special thanks to Dr. Terry Yochum
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Bone scan (scintigraphy)
Utilizes radioactive pharmaceutical injected into blood stream
Agent accumulates in regions of increased blood flow and increased bone metabolism
Patient is scanned, and “hot spots”demonstrate the areas of accumulation
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Bone scan (scintigraphy)
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Bone scan (scintigraphy)
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Bone scan (scintigraphy)
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Bone scan (scintigraphy)
Lung perfusion scans
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Scintigraphy (Bone scan)
Dx: Osteoid Osteoma
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Bone scan (scintigraphy)
Advantages:
Highly sensitive to bone changes
Shows function changes early
Relatively cheap procedure
Disadvantages:
Ionizing radiation
Poor specificity for lesions
Invasive procedure Infection/allergies
Normal “hot spots” Open epiphyses
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SPECT scan
Single photon emission computed tomography
Combination of bone scanning with ability of CT to give tomographic “slices”through body
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SPECT scanner
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SPECT scan
Pars interarticulares stress reaction (fracture?) in young athlete
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Osteoid Osteoma
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SPECT-CT Scan
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Diagnostic ultrasound Soundwaves penetrate surface of
patient
Waves are reflected back to surface as soundwaves pass through different densities of tissues
Reflected waves are recorded and an image constructed
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Diagnostic ultrasound Soundwaves reflected
back based upon changes in densities (interface).
Allows evaluation of fluid accumulation as well as fibrotic changes in tissue
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Diagnostic ultrasound Realtime images
Allows multiplanar imaging
Areas in motion
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Diagnostic ultrasound
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Diagnostic ultrasound
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Diagnostic ultrasound
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Diagnostic ultrasound
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Diagnostic ultrasound
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Diagnostic ultrasound
Tenosynovitis of the tibialis posterior tendon
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Diagnostic Ultrasound
OUCH!!
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Diagnostic Ultrasound
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Diagnostic ultrasound Advantages:
Real time imaging
Good soft tissue resolution
No ionizing radiation
Relatively inexpensive
Shows early edema, and fibrotic changes
Disadvantages:
Very difficult to interpret
Not all areas thoroughly researched (spine)
Shadowing effect