RADT 146 Test 2 Questions with100% Correct
Answers
Glass Plates
- First radiograph was produced on glass plates
- high quality glass covered in light tight paper so that light wouldnt hit it, glass plates were
covered in emulsion (layer that produced latent* image) and placed under patient
- hand processed using chemicals
*latent= invisible
X-ray film
- Used after glass plates
- was a cassette that held film, piece of polyester coated with emulsion on each side placed in 2
screens
- when x-rays hit screen it emits light & light interacts w/ emulsion on the film
-One or two double-emulsion film packet; identification dot used to determine film orientation
- reduced patient exposure compared to glass plates cuz image from emulsion was being
produced by light from the screen
- it takes little x-ray energy to produce light energy
- produced using light
Image capture of computed radiography
- imaging plate is used - Cassette holds imaging plate
- IP is put in a reader
- image is sent to computer for manipulation
, Image capture of digital radiography
- image is captured by a detector and sent directly to a computer
CR image formation
- Typical x-ray tube and table are used, but IP (imaging plate) is used rather than film/screen
cassette
- IP records a latent image using photostimulable phosphors (europium-activated barium
flourohalide)
- There are two types of Barium Fluorohalide phosphors :Barium fluorobromide and Barium
fluoroiodide
- PSP emit light later when exposed to a different light source (red laser)
- more light emitted= more radiation it trapped
- Europium is in small amounts and is the activator and also provides storage for the PSP.
Patient ID is scanned on IP for identification
- IP is placed in the IP reader
.• Inside the IP reader:
• A high-intensity red laser activates PSP crystals
• These crystals emit a blue-violet light
• This light is read by a photodetector
• The photodetector converts the light to an electric signal
Answers
Glass Plates
- First radiograph was produced on glass plates
- high quality glass covered in light tight paper so that light wouldnt hit it, glass plates were
covered in emulsion (layer that produced latent* image) and placed under patient
- hand processed using chemicals
*latent= invisible
X-ray film
- Used after glass plates
- was a cassette that held film, piece of polyester coated with emulsion on each side placed in 2
screens
- when x-rays hit screen it emits light & light interacts w/ emulsion on the film
-One or two double-emulsion film packet; identification dot used to determine film orientation
- reduced patient exposure compared to glass plates cuz image from emulsion was being
produced by light from the screen
- it takes little x-ray energy to produce light energy
- produced using light
Image capture of computed radiography
- imaging plate is used - Cassette holds imaging plate
- IP is put in a reader
- image is sent to computer for manipulation
, Image capture of digital radiography
- image is captured by a detector and sent directly to a computer
CR image formation
- Typical x-ray tube and table are used, but IP (imaging plate) is used rather than film/screen
cassette
- IP records a latent image using photostimulable phosphors (europium-activated barium
flourohalide)
- There are two types of Barium Fluorohalide phosphors :Barium fluorobromide and Barium
fluoroiodide
- PSP emit light later when exposed to a different light source (red laser)
- more light emitted= more radiation it trapped
- Europium is in small amounts and is the activator and also provides storage for the PSP.
Patient ID is scanned on IP for identification
- IP is placed in the IP reader
.• Inside the IP reader:
• A high-intensity red laser activates PSP crystals
• These crystals emit a blue-violet light
• This light is read by a photodetector
• The photodetector converts the light to an electric signal
