When X-ray photons strike the silver halide emulsion of the film, what happens to the silver halide emulsion?
It is sensitised
It is excited
It is neutralised
It is oxidised
When X-ray photons hit the silver halide emulsion, does this form the visible or latent image?
The embossed dot should face toward the operator and x-ray tube.
In a CCD X-rays hit the [blank_start]scintillation[blank_end] layer above the matrix/array and are converted to [blank_start]light[blank_end] photons. This creates a [blank_start]charge packet[blank_end] which represents the [blank_start]latent[blank_end] image. This is transmitted as an [blank_start]analogue[blank_end] voltage then converted by an analogue-digital converter to the digital image.
Instead of film, what do PSPP systems use?
Barium fluorohalide phosphor
For a PSPP system, the barium [blank_start]fluorohalide[blank_end] phosphor layer absorbs the X-ray photons and stores them (X-rays not [blank_start]attenuated[blank_end] by patient). The image plate is then placed in a laser reader and this causes the stored X-rays to be released as light. A [blank_start]photomultiplier[blank_end] tube then detects this light energy and converts it into a voltage which is then interpreted by a computer and displayed as a digital image.
Select the disadvantages of digital film
Loss of quality if printed
Image alteration possible
Expensive to initially implement
Select the advantages of digital film
Inexpensive to implement
Less security required in software
Digital X-ray processing:
1. [blank_start]Analogue[blank_end] voltage converted to numerical [blank_start]digital[blank_end] signal
2. Each pixel given x,y coordinate and [blank_start]number[blank_end]
3. The computer then allocates the number a shade of [blank_start]grey[blank_end] scale
the visible spectrum
A number 0 given to a pixel represents a black shade on the grey scale. What does this mean about X-ray attenuation of the patient?
The patient has not attenuated any of the X-rays
The patient has fully attenuated the X-rays
A number 255 given to a pixel represents a white shade on the grey scale. What does this mean about X-ray attenuation of the patient?
All of the X-rays have been attenuated by the patient
Some of the X-rays have been attenuated by the patient
None of the X-rays have been attenuated by the patient
Which factors affect the final resolution and size of a digital X-ray image?
Number of pixels
Size of pixels
Number of shades available from grey scale
Type of pixel
X-ray attenuation by patient
Put in the correct order the processing of X-ray film
During development of X-ray film, sensitised silver halide ions are reduced to black metallic silver. What part of the image does this produce?
Too long development of X-ray film leads to an image that is...
What is the name of the active ingredient in the developing solution used to develop X-ray film?
During fixation of the X-ray film image, what substance is used to remove unsensitised silver halide ions?
The removal of unsensitised silver halide ions results in which parts of the image?
The time taken to clear unsensitised silver halide ions is known as the...
The X-ray film is fixed for ........ the clearing time
The fixation solution is alkaline and thus contamination with the alkaline developer solution is not a problem.
The X-ray film emulsion is ........... by aliminium chloride.
After fixation, X-rays films are washed to remove residual chemicals. What chemical is used to wash them?
In manual processing there is sometimes an extra washing stage - when is this completed?