What determines the S in a Fuji CR system?
For Fuji systems, the sensitivity (S) relates to the median of the useful data range, whereas the gain is related to the range of intensities encompassed, and de- fines the latitude (L) [2, 3]. The latitude (L) affects the rela- tionship between sensitivity and exposure [2].
What is an s number in radiography?
S-values or “sensitivity” values represent the numeric value of exposure received by the receptors in the digital system. This represents a key value in monitoring that a quality radiograph is obtained with the least amount of dose to the patient.
What is the exposure index number?
Exposure index (EI) is the measure of the amount of exposure received by the image receptor (IR). It is dependent on mAs, total detector area irradiated, and beam attenuation. The exposure index is indicative of the image quality.
What is exposure index xray?
The exposure index (EI) in digital radiography has been used to indicate the relative speed and sensitivity of the digital receptor to incident X-rays and, ideally, to provide feedback to the technologist regarding the proper radiographic techniques for a specific exam that achieves an optimal image in terms of …
What is deviation index in radiography?
The deviation index quantifies the difference between the actual EI and the Target EI, and this feedback allows the radiographer to track and adjust his or her exposures. When the actual EI is equal to the Target EI, the DI will equal 0.
What is the 15 rule in radiology?
The 15% rule states that changing the kVp by 15% has the same effect as doubling the mAs, or reducing the mAs by 50%; for example, increasing the kVp from 82 to 94 (15%) produces the same exposure to the IR as increasing the mAs from 10 to 20.
What is the purpose of the prep button?
Pushing the rotor, or prep button, causes an electrical current to be induced across the filament in the cathode. This filament current is approximately 3 to 5 amps and operates at about 10 V. The amount of current flowing through the filament depends on the mA set at the control panel.
What is EI xray?
What does 15% rule mean?
How is mA in radiology calculated?
Milliamp (1/1000 of an amp) times(x) TIME (in seconds) is what controls the QUANTITY or the AMOUNT of x-ray photons produced. This is also what controls the BLACKENING or DENSITY on the x-ray film. mA = Milliamp s = seconds (usually in fractions of a sec.)
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