The f# compares the exposure to an established target exposure. An optimal exposure lies between 200 and 800. Each step requires a 25% change in exposure to occur (AAPM, 2009). Philips uses an EI that is inversely proportional to exposure. Delay time equals 5 minutes before exposure. Calibrate reader as needed (see EI table)ĮI is measured via normal Agfa procedure (two 1-mR exposures with plate rotated 180 degrees). This system compares the exposure level of the image to a baseline established for the department.ħ. SAL measured via normal Agfa procedure (two 1-mR exposures with plate rotated 180 degrees) Delay time equals 5 minutes before exposure.Īgfa CRs uses Exposure Index (EI) or log median exposure ( LgM). Relative exposure for same LgM if Agfa CR scan level calibrated using protocols of other manufacturers. Rotate cassette 180 degrees and expose againħ.
Siemens sid 801 workshop manual full#
Expose cassette transversely, full coverageĦ. 1.5 mm Cu filter, 20 cm thckness, no gridĤ. An optimal exposure lies between 1.9 and 2.5.ģ. Since it is based on a log system, an increase of 0.3 means the dose was doubled (Carlton & Adler, 2006, p. LgM is mapped to a 12-bit pixel called the Scan Average Level ( SAL). This system compares the exposure level of the image to a baseline established for the department.
![siemens sid 801 workshop manual siemens sid 801 workshop manual](http://manual.ecu-service.info/MULTI_CAN/mhhauto/easter/mazda.png)
Agfa LgMĪgfa CRs uses log median exposure ( LgM) or Exposure Index (EI). Every time you 1/2 your mAs, it should reduce the EI by 300. 1 mR results in an EI of 1000, 1 mR results in an EI of 2000, and an exposure of 10 mR results in 3000.For every double (x2) in mAs, the EI should increase about 300. A mR value is recorded from a QA meter.Īn exposure of. After that, the CR cassette is processed following a 15-minute delay after x-ray exposure. A QA meter is inserted under the AL + Cu filters to obtain mR readings. 5 mm Cu (copper) which simulates a chest exposure will yield a value of 2000 EI. The EI is calibrated so that a 1 mR exposure from 80 kVp at 125mA beam filtered by 1.5 mm AL and. A change of 300 in the EI indicates a change of a factor of 2 in the exposure to the IR. A Carestream CR-85X processor exposed images should have an EI between 300-600. Some Kodak CR processors properly exposed images should have an EI between 1,800-2,200 (Carlton & Adler, 2006, p. QA meter placement for AEC cells and EI testing ofĬarestream (Formerly Kodak) uses the term Exposure Index (EI), which is directly proportional to exposure. Normal Carestream EI values for 0.5mmCu+1mmAL=400 +/-5% Properly exposed images should have an S between 150-250 (Carlton & Adler, 2006, p. Therefore, all systems have a different index and are difficult to compare across systems.įuji uses a sensitivity number (S) that is related to the amount of amplification required by the photomultiplier tube to adjust the digital image. A high DQE results in lower noise levels (AAPM, 2009, p. Different IRs have different detective quantum efficiency (DQE).
Siemens sid 801 workshop manual software#
Also, there is variation between units purchased from the same manufacturer based on different IRs and software (Carlton & Adler, 2006, p. Therefore, to convert 100 cm to in take 100 centimeters multiplied by 0.3937008 which equals 70 inches.Īlthough EI is always derived from the IR exposure, equipment manufacturers calculate the numeric value differently, resulting in different ranges and definitions (Carlton & Adler, 2006, p. The formula for cm to in SID conversion is that 1 cm is 0.4 inches. By verifying EI values, technicians can use these values to verify Automatic Exposure Control (AEC) dose set points with CR/DR modalities. Although EI is always derived from the IR exposure, equipment manufacturers calculate the numeric value differently, resulting in different ranges and definitions.
![siemens sid 801 workshop manual siemens sid 801 workshop manual](https://m1.paperblog.com/i/458/4580048/averia-comun-ecu-siemens-sid-801-del-grupo-ps-T-ZokaP1.jpeg)
EI is derived from the mean detector entrance exposure which is in turn derived from the mean pixel value of the image. The exposure index is indicative of the image quality. It is dependent on mAs, total detector area irradiated, and beam attenuation. Exposure index (EI) is the measure of the amount of exposure received by the image receptor (IR).