What is digital fluoroscopy?
The same as conventional fluoro, except it links image data to a computer processing system
What does digital fluoro allow?
Faster image acquisition and ability to manipulate the image
How is a digital fluoro machine controlled/
Through a joystick/mouse/trackball which can be done remotely
What is the tube current of digital fluoro?
Much higher than conventional 100s vs .5-5 mA
How many images can be obtained per second in digital fluoro?
1-10 images per second
What are the types of detectors in digitial fluoro?
Flat panel detectors or CCDs
What type of generators are used in digital fluoro?
High frequency generators which are capable of rapid on/off switching which saves patient dose
What is interrogation time?
Time required for the tube to turn on and get tot he kVp and mA level set
What is extinction time?
Time required for the tube to turn offW
What is a duty cycle?
Amout of time the tube is activated
How is radiation moved in digital fluoro?
Pulsed to reduce dose
What is the time between pulses called?
Pulse width
How does digital fluoro work with a CCD?
- light from the output phosphor is captured by the CCD
- the silicon based CCD converts the light to electrical signal and routes it to a computer via ADC
What does the CCD offer in digital fluoro?
Higher SNR and better spatial resolution
What does the ABS system so?
Automatically manipulate the kVp and mass to adjust image brightness
What are the benefits of a flat panel detector in digital fluoro?
- distortion free images
- constant image quality over the entire image
- improved contrast resolution
- high DQE
- rectanuglar image area couple to similar image monitor
- unaffected by magnetic fields
What do flat panel detectors use?
Cesium Iiodide and amorphous - silicon
What are the benefits of indirect FPDs in fluoro?
- Superior quantum efficiency (60-70%)
- low dose performance
- optimal spectral response
- minimal lag
- superior SNR
Why are flat panel detectors taking over in digital fluoro?
- cover large areas in one exposure
- no optical components (lenses, mirrors)
- better spatial resolution
- improved workflow
- compact design
- lower patient dose
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Visual Qualities of an Image25
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Geometric Qualities of an Image22
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Factors Affecting Radiographic Quality134
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Technique Charts40
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AEC34
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Creating the Digital Image53
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Image Identification5
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Criteria For Image Eval17
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Image receptors21
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Conventional Fluoroscopy38
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Digital Fluoroscopy19
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Imaging Processing & Display95
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Quality Control33
