1 RT 255 C Cross Sectional Anatomy Week 1 FINAL 4-13-09.
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Transcript of 1 RT 255 C Cross Sectional Anatomy Week 1 FINAL 4-13-09.
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RT 255 CCross Sectional Anatomy
Week 1
FINAL
4-13-09
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Name the Sectional PlanesA
B
C
D
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Oblique and Transverse
Used for imaging of heart.
Commonly used in MR and sonography
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Axial (Transverse) Planes
– 1– 2– 3– 4– 5– 6
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Axial Scout
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Axial (cross sectional)
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Sagittal Plane
• 1
• 2
• 3
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Sagittal Scout
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Sagittal
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Coronal Plane
• 1
• 2
• 3
• 4
• 5
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Coronal
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Coronal
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Name the Imaging Plane
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Both Radiation: Why CT vs. Radiography
• Superimposition
• Contrast Resolution– Less scatter
• One exposure
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Similar to Radiography
• Radiopaque are white– Bone– Prosthesis
• Lower density images are gray– Fat – Muscles– Organs
• Very low density are black– Air
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Hounsfield Units
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Fundamentals of CT
Cross sectional
Tube rotates around patientDetectors measures
primary data
Primary data sent to computerCalculated according to algorithmData assembled into a
matrix
Each sectional slice is displaced on cathode ray tube
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Generations of Scanners
• First generation– 1– 2– 3– 4
• Second generation– 1– 2– 3– 4
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Third Generation
• Rotate/ rotate
• More than 750 detectors
• 1-10 seconds
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Fourth Generation
• Rotate only
• Fixed detectors
• More detectors
• Higher dose to PT
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Technical Aspects
• Remnant radiation is collected– 1– 2
• Electrical signal digitized– Each signal assigned a number
• Signals combined to form digital image– Field of View (FOV) determines amount of data to be
displayed on monitor
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Breakdown of the Digital Image
• Array of numbers– 1
• Pixel– 1– 2
• Voxel– 1– 2– 3
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System Components
• Computer– Operators console
• Gantry
• Table
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Computer
• Four basic functions
– 1. – 2– 3– 4
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Data Acquisition
• Tech chooses various parameters
– 1– 2– 3– 4
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Image Reconstruction
• Digitizes raw data
• Computer performs mathematical computations on a temporary storage system– Host computer has limited storage capacity
• Reconstruction takes a few seconds
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Long term Storage
• After reconstruction it is transferred to another storage medium
• Those temporary images on the host computer are archived separately as an independent study that can be retrieved later
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Image display
• Can be viewed on a video monitor
• Tech and doctor can communicate with host computer to view images
• Can manipulate images– 1– 2
– Image resolution lost with reconstruction in other planes
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Gantry• Circular
• Aperture is the hole PT goes in
• Houses– Detector, slip ring, generator and x-ray tube
• Tube similar to x-ray tube– Must withstand higher amounts of heat
• Can be tilted 30 degrees forward and back
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Table• Automated device linked to gantry &
computer
• Moves in increments – According to protocol
• Made of wood or low density carbon composite
• Has a weight limit
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Control Console
• Where the tech controls the scanner
• Has a keyboard, display monitor & mouse
• Allows tech to control– 1. – 2– 3– 4
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Image Manipulation
• Windowing– 1.
• Window width– 1– 2– 3
• Window level– 1– 2
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Windowing
Window width 400
Window level 35
Window width 2200
Window level 400
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Factors Affecting Image Quality
• Spatial resolution
• Contrast resolution
• Noise
• Artifacts
• Patient factors
• Scan times
• Scan diameter
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Spatial Resolution
• What happens to resolution with smaller phosphor crystals in standard film screen systems?
• Is a function of pixel size– Smaller: better detail
• Thinner slices: increased detail
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Contrast Resolution and Noise
• Ability to distinguish adjacent tissue
• In CT it is better than in conventional x-ray– Less scatter
• Appears as graininess
• Low noise is smooth to the eye
• High noise is blotchy and spotty
• As noise increases contrast resolution decreases
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Artifacts
• Streak artifacts– Metallic objects,
pacemakers, and prosthesis
• High concentration barium
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Patient Factors
• Motion
• Size of patient
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Image Quality under Tech Control
• Slice thickness
• Scan time
• Scan diameters
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Diagnostic Applications• Most common anatomy examined is
– Head, chest and abdomen
• Exam of choice for:– Head trauma– CVA
• Also useful for:– Infarctions– Hemorrhage– Disk herniations– Craniofacial fractures and tumors– Cancers– Hydrocephalus– Degenerative diseases– Inflammatory infections– Congenital disorders
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Use of Contrast Media
• Can be administered orally, rectally and intravenously
• IV usually non-ionic contrast
• BA and Hypaque used for abdomen and GI studies.– 2% concentration BA– Low concentration (hypaque)
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Special Features
• Dynamic scanning
• CT angiography (CTA)
• Spiral/helical CT
• Multi-slice Spiral/helical CT
• 3 D imaging
• Radiation therapy treatment
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Dynamic Scanning and CTA
• After contrast administration
• Sequential scanning times as different structures enhance
• CTA: – 1– 2– 3
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CTA
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CTA
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Spiral / Helical CT and Multi-slice Spiral/ Helical CT
• Single row of detectors
• Gantry rotates around PT as table moves
• Scans a volume instead of slices
• Better detail
• Fast scan times– For peds and combative
patients
• Multiple rows of detector arrays
• A four row scanner would scan 4 times faster
• Improced spatial resolution
• LG areas of body can be done with one breath hold
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Spiral and Multi-slice Spiral
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3D Imaging
• Postprocessing technique
• Takes 2D raw data and constructs a 3D image
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3D imaging
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3D Imaging
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Radiation Therapy Planning
• Gives volumetric and depth calculation ability
• Allows for one CT instead of the 3 they used to do
• Flat board used instead of curved couch
• Dose to normal tissue is minimized
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RAD Therapy and CT
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RAD Therapy and CT
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CT and Radiation Dose
• CT doses are higher than conventional radiography
• A lower pitch results in a higher dose– More overlap
• Thinner slices also result in a higher dose
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CT vs. MRI
• MRI exhibits better low contrast than CT
• Higher cost and takes longer
• Cannot do with metal
• CT demonstrates bone better than MRI
• Faster, so preferred for some PT’s– Small gantry– Wide aperture
• Less costly
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The Future of CT
• Has significantly increased in the past 5 years
• Higher quality images increase accuracy of diagnosis and treatment
• Cost effective
• Will continue to be a diagnostic tool