What is the fill factor of a detector element?
Conventional FPAs utilize square detector elements with a nearly 100% fill factor, where fill factor is defined as the fraction of the detector element area that is active in light detection.
What is the relationship between fill factor and spatial resolution?
A high fill factor will provide better spatial resolution and contrast resolution than low fill factors. Sensing area of a pixel receives the data from the layer above it that captures x-rays and either converts it to light or straight to electrical charges.
Which of the following radiographic qualities determines the sharpness of the finished radiograph?
Which of the following radiographic qualities determines the sharpness of detail in the finished radiograph? Sharpness of detail is controlled by maximizing recorded detail/spatial resolution and minimizing distortion.
Why is it important to choose the appropriate size cassette for a computed radiography CR examination?
CR can use cassettes of multiple sizes, which means the detector size can be selected to match the procedure and to increase the flexibility of positioning, whatever the area of examination.
What is fill factor in digital radiography?
Fill factor is the percentage of the pixel in a digital radiographic image receptor that is sensitive to the incoming x-ray beam and allows conversion of the incident x-ray beam into light.
What is meant by fill factor?
Fill factor (FF) is the ratio of the actual maximum obtainable power, represented by the dark blue box, to the product of short circuit current Is/c and open circuit voltage Vo/c, represented by the light blue box.
Why is fill factor important in digital processing?
Fill factor is the ratio of the light sensitive area of a pixel to the total area of a pixel on a digital imaging sensor. The higher the fill factor, the more sensitive a sensor is to light.
Which of the following factors would produce a radiographic image with the highest spatial resolution?
Which of these factors would produce a radiographic image with the highest spatial resolution? Spatial resolution is best with decreased pixel size, increased matrix size, and a decreased field-of-view (exposure field). Increasing the pixel size DECREASES spatial resolution.
What are the advantages of using high kVp techniques?
One advantage of using high kV technique is shorter exposure time [1]. The higher the energy, the more photons will penetrate the body, the less that are absorbed. Although this reduces patient dose, image quality is compromised due to reduced contrast of a preferentially forward scattered radiation [2], [3].
What is computed radiography vs digital radiography?
Computed Radiology (CR) is the digital replacement of X-ray film radiography. CR radiography uses phosphor image plates to create a digital image. Although it is an older technology, it is still digital technology and is more cost effective. It does need more input and requires more time for image acquisition.
What is difference between cassette and cassette less digital radiography?
The CR cassette goes into a reader to convert the data into a digital image. Digital radiography (DR) systems use active matrix flat panels consisting of a detection layer deposited over an active matrix array of thin film transistors and photodiodes.
What does the term fill factor refer to?