What is the image receptor?
Image receptor means any device, such as a fluorescent screen or radiographic film, which transforms incident X-ray photons either into a visible image or into another form which can be made into a visible image by further transformations.
What are the 3 types of image receptors?
They include direct solid-state (Figure 3) and indirect photo-stimulable phosphor plates (PSP) that are similar to flexible radiographic film (Figure 4). The solid-state technology uses different semi-conductor-based detectors 1) CCD, 2) CMOS, and 3) flat panel. Figure 3.
What is inside the image receptor?
Most commonly, the image receptor is a fluorescent screen, held in intimate contact with a sheet of single-emulsion photographic film in a light-tight cassette.
How does an x-ray capture an image?
X-rays are a form of electromagnetic radiation, similar to visible light. If x-rays travelling through the body also pass through an x-ray detector on the other side of the patient, an image will be formed that represents the “shadows” formed by the objects inside the body.
What is a digital receptor?
The digital receptor is the device that intercepts the x-ray beam after it has passed through the patients body and produces an image in digital form, that is, a matrix of pixels, each with a numerical value.
What is quantization xray?
Quantization. the assignment of a numeric value for each pixel bit depth, which controls the number of grey shades, hence contrast resolution. CR Histogram. algorithm or mathematical information to evaluate the overall intensity of each procedure.
What are the components of the image receptor system?
Image Receptor — X-ray Image Intensifier (XRII) The key components of an XRII are an input phosphor layer, a photocathode, electron optics and an output phosphor. The cesium iodide (CsI) input phosphor coverts the X-ray image into a visible light image, much like the original fluoroscope.
What type of image receptor is used in conventional radiography?
Digital Image Receptors. Two types of digital IRs are typically used in radiography: computed radiography (CR) and direct digital radiography (DR) IRs. These IRs differ in their construction and how they acquire the latent image.
What is produced by a digital image receptor?
What is XRAY latitude?
Radiographic latitude refers to the range of material thickness that can be imaged This means that more areas of different thicknesses will be visible in the image. In thick parts with a large range of thicknesses, multiple radiographs will likely be necessary to get the necessary density levels in all areas.
What is the flux gain formula?
flux gain equation. flux gain=number of output light photons/number of input x-ray photons.