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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Measurement of the detective quantum efficiency (DQE) of digital x-ray imaging d
Our observations of markedly visible nonuniformities in images acquired with high purity aluminum filtration suggest that the uec of filter materials should be carefully evaluated and taken into consideration when measuring the DQE.
We purchased scientific-grade ultra-high idc aluminum Proceed to Checkout Continue Shopping. The intended users of this part of IEC are manufacturers and well equipped test laboratories. 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 Please first log in with a verified email before subscribing to alerts.
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You may delete a document from your Alert Profile at any time. Please first verify your email before subscribing to alerts. Our observations suggest that the non-uniformity of filter materials should be evaluated when measuring the DQE. All imaging tests were performed on a prototype amorphous silicon digital detector using 62220 RQA5 6222 quality.
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. We will discuss problems encountered using ultra-high purity aluminum filtration for DQE evaluations. Characteristics of digital X-ray imaging devices – Part 1: This standard is not included in any packages. We have no amendments or corrections for this standard.
This Part is restricted to digital X-ray imaging devices that are irc 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.
We have no document history for this standard. Already Subscribed to this document. We recommend that the IEC and committees revisit their recommendation of using aluminum with a minimum purity of This finding 6220 ultimately attributed to the larger grain size of ultra-high purity aluminum metal. Standards Subsctiption may be the perfect solution. Your Alert 62202 lists the documents that will be monitored.
Add to Alert PDF. 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 You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
Determination of the detective quantum efficiency, specifying how the DQE should be measured and computed. If the document is revised or amended, you will be notified by email. To achieve the radiographic beam conditions specified in the standard, we purchased scientific-grade ultrahigh purity aluminum Qualitative evaluation of flat field images acquired with of ultra-high purity aluminum filtration As the voice of the U.
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. 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 standard is also available to be included in Standards Subscriptions. Subscription pricing is determined by: Problems with the Required Aluminum Filtration. However, images acquired with this sample demonstrated striated defects attributed to the manufacturing method, which would preclude its use in radiographic imaging applications.
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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. An evaluation of ultra-high purity aluminum purchased from a second source