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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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. 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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To achieve the radiographic beam conditions specified in the standard, we purchased scientific-grade ultrahigh purity aluminum Find Similar Items This product falls into the following categories. An evaluation of ultra-high purity aluminum purchased from a second source 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 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.
Determination of the detective quantum efficiency.
IEC System of Conformity Assessment Schemes
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BS EN 62220-1-1:2015
Our observations suggest that the non-uniformity of filter materials should be evaluated when measuring the DQE.
Edit my profile Access my dashboard. This low frequency mottle significantly overestimates the NPS at low frequencies, which in turn will cause an under-estimation of the low frequency DQE. Learn more about the cookies we use and how to change your kec.
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Determination of the detective quantum efficiency – Detectors used in mammography. Search all products by. Detectors used in radiographic imaging Status: This finding was ultimately attributed to the larger grain size approximately mm of high purity aluminum metal, which is a well-known characteristic, particularly in thicknesses greater than 1 mm. 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 at 74 kV RQA5 beam quality with 21 mm of lower-purity aluminum Specifies the method for the determination of the detective quantum efficiency 6222-1 of digital X-ray imaging devices as a function of air kerma and of spatial frequency for the working conditions in the range of the medical application as specified by the manufacturer.
Detectors used in radiographic imaging. 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. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. We recommend that the IEC and committees revisit their recommendation of using aluminum with a minimum purity 6222-1 Qualitative evaluation of flat field images acquired with of ultra-high purity aluminum filtration Characteristics of digital X-ray imaging devices – Part 1: Problems with the Required Aluminum Filtration.
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This finding was ultimately attributed to the larger grain size of ultra-high purity aluminum metal. Log in Username Password Forgot your password? Determination of the detective quantum efficiency, specifying how the DQE should be measured and computed.
Medical electrical equipment – Characteristics of digital X-ray imaging devices – Part All imaging tests were performed on a prototype amorphous silicon digital detector using iex RQA5 beam quality.
The intended users of this part of IEC are manufacturers and well equipped test laboratories. However, images acquired with this sample demonstrated striated defects attributed to the manufacturing method, which would preclude its use in radiographic imaging applications. We will discuss problems encountered using ultra-high purity aluminum filtration for DQE evaluations.