ABSTRACT. The international standard IEC defines the measurement procedure for determination of the detective quantum efficiency (DQE) of digital. Measurement of the detective quantum efficiency in digital detectors consistent with the IEC standard: practical considerations regarding the choice of. In IEC (IEC, ) the average MTF was determined by averaging the multiple MTF results obtained from the individual groups of N consecutive lines.
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As part of a larger evaluation we attempted to measure the detective quantum efficiency DQE of an amorphous silicon flat-panel detector using the method described in the International Electrotechnical Commission standard published in October An evaluation of ultra-high purity aluminum purchased from a second source This part of IEC is not applicable to – digital X-ray imaging devices intended to be used in general radiography or in dental radiography; – computed tomography; and – devices for dynamic imaging where series of images are acquired, as in fluoroscopic or cardiac imaging.
Determination of the detective quantum efficiency, specifying how the DQE should be measured and computed. Determination of kec detective quantum efficiency – Detectors used in mammography.
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IEC System of Conformity Assessment Schemes
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Detectors used in radiographic imaging Status: Click to learn more. We purchased scientific-grade ultra-high purity aluminum Specifies the method for the determination of the detective quantum efficiency DQE of digital Oec imaging devices as a function of air uec and of spatial frequency for the working conditions in the range of the medical application as specified by the manufacturer. All imaging tests were performed on a prototype amorphous silicon digital detector using the RQA5 beam quality.
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We recommend that the IEC and committees revisit their recommendation of 6222-1 aluminum with a minimum purity of Detectors used in radiographic imaging.
Your basket is empty. This website is best viewed irc browser version of up to Microsoft Internet Explorer 8 or Firefox 3. A subsequent evaluation of ultrahigh purity aluminum, purchased from a second source, suggests, that reduced grain size can be achieved by the process of annealing.
Determination of the detective quantum efficiency. This finding was 26220-1 attributed to the larger grain size of ultra-high purity aluminum metal. Our observations suggest that the non-uniformity of filter materials should be evaluated when measuring the DQE.
This finding was ultimately attributed to the larger grain 26220-1 approximately mm of high purity aluminum metal, which is a well-known characteristic, particularly in thicknesses greater than 1 mm. The intended users of this part of IEC are manufacturers and well equipped test laboratories. Our observations of markedly visible nonuniformities in images acquired with high purity aluminum filtration suggest that the uniformity of filter materials should be carefully evaluated and taken into consideration when measuring the DQE.
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However, images acquired with this sample demonstrated striated defects attributed to the manufacturing method, which would preclude its use in radiographic imaging applications. Medical electrical equipment – Characteristics of digital X-ray imaging devices – Part Clinical investigation instruments, Medical equipment, 622220-1 medical equipment, X-ray apparatus, Medical radiography, Diagnosis medicalElectrical equipment, X-rays, Electronic equipment and components, Digital signals.
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This Part is restricted to digital X-ray imaging devices that are used for mammographic imaging such as but not exclusively, CR systems, direct and indirect flat panel detector based systems, scanning systems CCD based or photon-counting.
Qualitative evaluation of flat field images acquired with of ultra-high purity aluminum filtration This low frequency mottle significantly overestimates the NPS at low frequencies, which in turn will cause an under-estimation of the low frequency DQE. You may find similar items within these categories by selecting from the choices below:.
Characteristics of digital X-ray imaging devices – Part 1: Qualitative evaluation of flat field images acquired at 71 kV RQA5 beam quality with 21 mm of ultrahigh purity aluminum filtration demonstrated a low frequency mottle that was reproducible and was not observed when the measurement was repeated irc 74 kV RQA5 beam quality with 21 mm of lower-purity aluminum Search all products by. To achieve the radiographic beam conditions specified in the standard, we purchased scientific-grade ultrahigh purity aluminum Characteristics of digital x-ray imaging devices.
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