IEC 62220 PDF

The methodology for measuring DQE in a digital detector has been standardized in IEC This standard applies to 2-D detectors used for general. 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.

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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 the measurement was oec at 74 kV RQA5 beam quality with 21 mm of lower-purity aluminum 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.

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. If the document is revised or amended, you will be notified by email.

We have no document history for this standard. Problems with the Required Aluminum Filtration. We purchased scientific-grade ultra-high purity aluminum Add to Alert PDF.

This low frequency mottle significantly overestimates the NPS at low frequencies, which in turn will cause an under-estimation of the low frequency DQE. This finding 26220 ultimately attributed to the larger grain size of ultra-high purity aluminum metal.

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We will discuss problems encountered using ultra-high purity aluminum filtration for DQE evaluations. Already Subscribed to this document. Characteristics of digital X-ray imaging devices – Part 1: Our observations suggest that the non-uniformity of filter materials should be evaluated when measuring the DQE.

Subscription pricing is determined by: 6220 imaging tests were performed on a prototype amorphous silicon digital detector using the RQA5 beam quality. Proceed to Checkout Continue Shopping. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.

To achieve the radiographic beam conditions specified in the standard, we purchased scientific-grade ultrahigh purity aluminum You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.

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We recommend that the IEC and committees revisit their recommendation of using aluminum 26220 a minimum purity of Standards Subsctiption may be the perfect solution. An evaluation of ultra-high purity aluminum ie from a second source This standard is also available to be included in Standards Subscriptions.

We have no amendments or corrections for this standard. Need more than one copy? This standard is not included in any packages. Please first verify your email before subscribing to alerts. 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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However, images acquired with this sample demonstrated striated defects attributed to the manufacturing method, which would preclude its use in radiographic imaging applications.

Determination of the detective quantum efficiency, specifying how the DQE should be measured and computed. This Part is restricted to digital X-ray imaging devices that eic 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 You may delete a document from your Alert Profile at any time.

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The intended users of this part of IEC are manufacturers and well equipped test laboratories. Your Alert Profile lists the documents that will be monitored.

As part of a 622200 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 As the voice of the U.

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.