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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Our observations suggest that the non-uniformity of filter materials should be evaluated when measuring the DQE.
Take the smart route to manage medical device compliance. Determination of the detective quantum efficiency. Detectors used in radiographic imaging Status: 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.
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Characteristics of digital x-ray imaging devices. Accept and continue Learn more about the cookies we use and how to change your settings. Learn more about the cookies we use and how to change your settings. The intended users of this part of IEC are manufacturers and well equipped test laboratories.
Problems with the Required Aluminum Filtration. You may find similar items within these categories by selecting from the choices below:.
Clinical investigation instruments, Medical equipment, Electrical medical equipment, X-ray apparatus, Medical radiography, Diagnosis medicalElectrical equipment, X-rays, Electronic equipment and components, Digital signals.
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.
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Click to learn more. Determination of the detective quantum efficiency, specifying how the DQE should be measured and computed. We purchased scientific-grade ultra-high purity aluminum However, images acquired with this sample demonstrated striated defects attributed to iex manufacturing method, which would preclude its use in radiographic imaging applications.
Edit my profile Access my dashboard. This finding was ultimately attributed to the larger grain size approximately mm of 62220-1 purity aluminum metal, which is a well-known characteristic, particularly in thicknesses greater than 1 mm. This Part is restricted to digital Uec 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.
An evaluation of ultra-high purity aluminum purchased from a second source 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 This low frequency mottle significantly overestimates the NPS at low frequencies, which in turn 26220-1 cause an under-estimation of the low iex DQE.
All imaging tests were performed on a prototype amorphous silicon digital detector using the RQA5 beam quality. Determination of the detective quantum efficiency – Detectors used in mammography. Find Similar Items This product falls into the following categories. Please download Chrome or Firefox or view our browser tips.
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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 Log in Username Password Forgot your password? The faster, easier way to work with standards. 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.
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. You may experience issues viewing this site in Internet Explorer 9, 10 or Characteristics of digital X-ray imaging devices – Part 1: This finding 62220–1 ultimately attributed to the larger grain size of ultra-high purity aluminum metal.
We recommend that the IEC and committees revisit their recommendation of using aluminum with a minimum purity of Bestimmung der detektiven Quanten-Ausbeute. We will discuss problems encountered using ultra-high purity aluminum filtration for DQE evaluations. Detectors iecc in radiographic imaging.
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