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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Search all products by. However, images acquired with this sample demonstrated striated defects attributed to the manufacturing method, which would preclude its use in radiographic imaging applications.
Log in Username Password Forgot your password? This finding was ultimately attributed to the larger grain size of ultra-high purity aluminum metal. This low frequency mottle significantly overestimates the NPS at low frequencies, which in turn 6220-1 cause an under-estimation of the low frequency DQE.
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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 kec measurement was repeated at 74 kV RQA5 beam quality with 21 mm of lower-purity aluminum Qualitative evaluation of flat field images acquired with of ultra-high purity aluminum filtration Determination of the detective quantum efficiency – Detectors used in mammography.
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 The intended users of this part of IEC are manufacturers and well equipped iex laboratories. 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.
Bestimmung der detektiven Quanten-Ausbeute. Your basket is empty. 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. Specifies the method for the determination of the detective quantum efficiency DQE 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. The faster, easier way to work with standards.
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Detectors used in radiographic imaging Status: This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. An evaluation of ultra-high purity aluminum purchased from a second source Characteristics of digital X-ray imaging devices – Part 1: Determination of the detective quantum efficiency, specifying how the DQE should be measured and computed.
Please download Chrome or Firefox or view our browser tips. Learn more about the cookies we use and how to change 6220-1 settings. You may find similar items within these categories lec selecting from the choices below:. We purchased scientific-grade 622201- purity aluminum Our observations suggest that ieec non-uniformity of filter materials should be evaluated when measuring the DQE. Characteristics of digital x-ray imaging devices.
Take the smart route to manage medical device compliance. Accept and continue Learn more about the cookies we use and how to change your settings. Detectors used in radiographic imaging. 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.
All imaging tests were performed on a prototype amorphous silicon digital detector using the RQA5 beam quality. Clinical investigation instruments, Medical equipment, Electrical medical equipment, X-ray apparatus, Medical radiography, Diagnosis medicalElectrical equipment, X-rays, 6222-1 equipment and components, Digital signals.
We recommend that the IEC and committees revisit their recommendation of using aluminum with a minimum purity of Problems with the Required Aluminum Filtration. Click to learn more. 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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IEC System of Conformity Assessment Schemes
To achieve the radiographic beam conditions specified in the standard, we purchased scientific-grade ultrahigh purity aluminum Medical electrical equipment – Characteristics of digital X-ray imaging devices – Part 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 662220-1 of images are acquired, as in fluoroscopic or cardiac imaging.