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Exposure Index

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Key: additions deletions

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	Date/Time	Made By	Edit Note	Type	Scope
	Feb 4 2011, 7:47 PM EST	eliseleblanc	added some acceptable EI ranges.	edit	16 words added
Change: An optimal exposure lies between 1.9 and 2.5.Philips DRPhilips uses an EI that is inversely proportional to exposure. This index is represented in bigger discrete steps (eg., 100, 125, 160, 200, 250, 320, 400, 500, etc). Each step requires a 25% change in exposure to occur (AAPM, 2009). View changes from previous version. (Word count: 970)
	Mar 27 2010, 9:20 AM EDT	unphil	minor edits	edit	3 words added 2 words deleted
Change: theto the standard the EI shall be proportional to the exposure (air kerma) and shall be scaled as EI = 100 * X, where X is the air kerma at the detector, forat the calibration beam quality. It is expected that this standard definition will be View changes from previous version. (Word count: 952)
	Mar 27 2010, 5:27 AM EDT	unphil	added standardization (IEC) developments	edit	107 words added
Change: In 2008, the International Electrotechnical Commission (IEC) developed and published the International Standard IEC 62494-1 on the definition and scaling of the exposure index for digital radiography. According the the standard the EI shall be proportional to the exposure (air kerma) and shall be scaled as EI = 100 * View changes from previous version. (Word count: 951)
	Feb 5 2010, 8:16 PM EST	unphil	corrected name spelling	edit	4 words added 4 words deleted
Change: (Nitzel,(Neitzel, 2004, p. S231). This is a histogram created from an AP pelvis radiograph. The x-axis represents the pixel value while the y-axis represents the number of pixels with that value. The mean pixel value here is 104.381.Although EI is always derived from View changes from previous version. (Word count: 845)
	Dec 18 2009, 10:04 AM EST	eliseleblanc		edit	462 words added 68 words deleted 1 image added
Change: Siemens uses an Exposure Index (EXI). EXI is calculated by dividing the field into a 3x3 matrix and assessing only the central segment, and is View changes from previous version. (Word count: 845)
	Dec 18 2009, 12:46 AM EST	eliseleblanc	Added manufacturers	edit	117 words added
Change: Fuji uses a sensitivity number (S) that is related to the amount of amplification required by the photomultiplier tube to adjust the digital image. S is inversely proportional to exposure. Properly exposed images should have an S between 150-250 (Carlton & Adler, 2006, p.367).KodakKodak uses the View changes from previous version. (Word count: 458)
	Dec 18 2009, 12:36 AM EST	eliseleblanc	Added content	edit	323 words added
Change: EI in digital radiography can be compared to film speed and blackening in film-screen. In fact, the definiton for EI is quite similar to that View changes from previous version. (Word count: 336)
	Dec 18 2009, 12:35 AM EST	eliseleblanc		create	No content added or deleted.
Change: Created by eliseleblanc Dec 18 2009, 12:35 AM EST for: no reason given

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