7 - X-rays - 30 min
Transcript of 7 - X-rays - 30 min
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X-Rays
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Nov. 1895 – Wilhelm Röntgen Announces X-ray discovery in Germany
Jan. 13, 1896 – Images needle in patient’s hand– X-ray used presurgically
1901 – Receives first Nobel Prize in Physics
History
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Definition
• Electromagnetic radiation (1017 to 1021 Hz).• High energy
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• When a fast-moving electron swings around a heavy nucleus, it accelerates rapidly
• Electron emits much of its energy as X-ray photon
Bremsstrahlung
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• When a colliding electron excites an atom to high-energy state, that atom can then radiate an x-ray photon
Characteristic
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Definition
electron beam generator
tungsten target metal
resultant X-ray beam
silver halide film
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• The electrons come from a tungsten lamp which current can be from 25 to 1.200 mA
• Electrons accelerated with voltages from 25 kV to 150 kV
• Let electrons hit heavy atoms
X-rays
X-ray Tube
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http://www.spineuniverse.com/videos/x-rays/
X-ray Tube
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• Some x-rays emitted via bremsstrahlung and some as characteristic X rays
• X-ray tube filters awaylowest energy photons (Bremsstrahlung)
X-ray Production
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X-ray Tube
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Accelerate electrons towards anode results in:
Typically Tungsten Target • High melting point• High atomic number• 3000 rpm to 10000 rpm
1. Collision events produce heat (95 % of energy)2. Photoelectric effect
3. X-ray
X-ray Tube
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X-ray Tube
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X-ray Tube
Operator can change:• Tube voltage• Filament current• Exposure time(millisecond to several minutes)
An increase in voltage leads to decreased image contrast and increased SNR.
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Collimator
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Aluminium grid
Patient
X -ray source
Target film
Grid
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Aluminium grid
Patient
X -ray source
Target film
Grid
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Grid
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Grid
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Grid
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Block Diagram
High voltage generator X-ray tube
Collimator and filters
Automatic exposurecontrol
Control panel
Storage system
File processingsystem
Detection system
CAD = COMPUTER-ASSISTED DIAGNOSIS
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Block Diagram
X-ray Generator
Control PanelPower Supply
Autotransformer
kV Selection
Timer
mA Selection
X-ray Tube
High Voltage Circuit
Filament Circuit
Timer
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Block Diagram
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Block DiagramSiemens Polimobil III
10 kHz
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Power Supply
100 W to more than 100 kW
• Dedicated distribution transformers• Appropriate size conductors• Higher line voltage (reduce conductor size)• Low-power operates in 220 V• Higher power equipment 440/480 V
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Portable X-ray
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Automatic X-ray Film Processor
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Digital X-ray
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DICOMDigital Imaging and Communications in Medicine
Format definition and a network communications protocols
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Safety
• Shielded walls
• Charging in capacitors (360 VDC)
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Maintenance“ALWAYS turn off high voltage circuit”
• Mechanical Arms
Broken chain
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Maintenance“ALWAYS turn off high voltage circuit”
• Power supply – fuse burnt by spikes• Inversor circuit• Tube heating
– Loose alignment of rotor axe – friction– Burn filament– Air bubbles
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Calibration Equipment
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Angiography - Contrast Injection
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Mammography
Normal tissue
Tissue with cancer cells
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Mammography
History
In 1930 in the United States, Stafford Warren reported the diagnostic value of performing mammography on live patients.
Wiley - Encyclopedia of Biomedical Engineering - 6 Vol. Set
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Mammography
History
In 1930 in the United States, Stafford Warren reported the diagnostic value of performing mammography on live patients.
Wiley - Encyclopedia of Biomedical Engineering - 6 Vol. Set
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(<35 kVp)
2 Positions:
horizontal and 45 degrees
Mammography
X ray source
X-ray beam
Screen-film
cassette
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Mammography
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Mammography
CAD Image
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Fluoroscopy
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Fluoroscopy
CRC Press - Biomedical Photonics Handbook
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X–rays Dental
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Radiotherapy
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RadiotherapyELECTRON-BEAM