Describe Pulsed Fluoroscopy
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- Pulsed beam gives increased QM, decreased image quality
- Gives lower radiation dose to patient
- Uses a higher mA per pulse to try and decrease quantum mottle
- Used for the passage of guidewires, catheters, and sheaths where the
poorer resolution is sufficient to show positioning of the devices
What converts x-rays to light?
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, input phosphor
Describe the angiography equipment
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1. Use large diameter, thick anodes because the X-ray tube must tolerate
high heat loads (1 MHU)
2. High power rating for rapid sequence serial radiography
3. C-arms are floor/ceiling mounted, table floats where needed
4. A small 0.3 mm focal spot must be available for detailed imaging of small
vessels.
Describe the fluoroscopy configuration with the x-ray tube over the table
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- the x-ray tube is above the table top and the image intensifier is below.
This offers an advantage of allowing greater distance between the patient,
I.I, and tube.
Briefly explain the path of an x-ray through the II.
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, 1. X-rays absorbed by input fluorescent screen
2. Light produced
3. Light photons strike photocathode which emits photoelectrons
4. Electrons attracted to anode at other end of II
5. Electrons are focused onto output screen by electrostatic lenses
6. Electrons strike output screen where light emitted
7. Visual light image
(Picked up by CCDs, Digital signal now sent to digital image processor
memory in computer, The electrical charge values, once digitized,
correspond to pixel brightness values on the resultant image)
what converts light to electrons
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photocathode
What are the main types of Fluoroscopy configurations?
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- x-ray tube under table (stationary)
- x-ray tube over table (stationary)
- c-arm (mobile)
- dual tube/bi-plane
Describe the video monitoring system (Mobile Viewing station)
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Give this one a try later!
- Pulsed beam gives increased QM, decreased image quality
- Gives lower radiation dose to patient
- Uses a higher mA per pulse to try and decrease quantum mottle
- Used for the passage of guidewires, catheters, and sheaths where the
poorer resolution is sufficient to show positioning of the devices
What converts x-rays to light?
Give this one a try later!
, input phosphor
Describe the angiography equipment
Give this one a try later!
1. Use large diameter, thick anodes because the X-ray tube must tolerate
high heat loads (1 MHU)
2. High power rating for rapid sequence serial radiography
3. C-arms are floor/ceiling mounted, table floats where needed
4. A small 0.3 mm focal spot must be available for detailed imaging of small
vessels.
Describe the fluoroscopy configuration with the x-ray tube over the table
Give this one a try later!
- the x-ray tube is above the table top and the image intensifier is below.
This offers an advantage of allowing greater distance between the patient,
I.I, and tube.
Briefly explain the path of an x-ray through the II.
Give this one a try later!
, 1. X-rays absorbed by input fluorescent screen
2. Light produced
3. Light photons strike photocathode which emits photoelectrons
4. Electrons attracted to anode at other end of II
5. Electrons are focused onto output screen by electrostatic lenses
6. Electrons strike output screen where light emitted
7. Visual light image
(Picked up by CCDs, Digital signal now sent to digital image processor
memory in computer, The electrical charge values, once digitized,
correspond to pixel brightness values on the resultant image)
what converts light to electrons
Give this one a try later!
photocathode
What are the main types of Fluoroscopy configurations?
Give this one a try later!
- x-ray tube under table (stationary)
- x-ray tube over table (stationary)
- c-arm (mobile)
- dual tube/bi-plane
Describe the video monitoring system (Mobile Viewing station)
Give this one a try later!
