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.
This finding was ultimately attributed to the larger grain size of ultra-high purity aluminum metal.
Measurement of the detective quantum efficiency (DQE) of digital x-ray imaging d
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 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 the RQA5 beam quality. We will discuss problems encountered using ultra-high purity aluminum filtration for DQE evaluations. Qualitative evaluation of flat field images acquired with of ultra-high purity aluminum filtration 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.
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Please first verify your email before subscribing to alerts. We recommend that the IEC and committees revisit their recommendation of using aluminum with a minimum purity of Proceed to Checkout Continue Shopping. Add to Alert PDF. This standard is not included in any packages. This standard is also available to be included in Standards Subscriptions.
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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; – 622220 tomography; and – devices for dynamic imaging where series of images are acquired, as in fluoroscopic or cardiac imaging. We have no amendments or corrections for this standard.
Already Subscribed to this document. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including kec networked server. However, images acquired with this sample demonstrated striated uec attributed to the manufacturing method, which would preclude its use in radiographic imaging applications.
Your Alert Profile lists the documents that will be monitored. Characteristics of digital X-ray imaging devices – Part 1: Determination of the detective quantum efficiency, specifying how the DQE should be measured and computed.
An evaluation of ultra-high purity aluminum purchased from a second source If the document is revised or amended, you will be notified by email. 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. Problems with the Required Aluminum Filtration. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
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.
We purchased scientific-grade ultra-high purity aluminum 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 ieec not observed when the measurement was repeated at 74 kV RQA5 beam quality with 21 mm uec lower-purity aluminum Standards Subsctiption may be the perfect solution.
To achieve the radiographic beam conditions specified in the standard, we purchased ic ultrahigh purity aluminum Subscription pricing is determined by: Need more than one copy? You may delete a document from your Alert Profile at any time. As the voice of 622220 U. This low frequency mottle significantly overestimates the NPS at low frequencies, which in turn will cause an under-estimation of the low frequency DQE.
The intended users of this part of IEC are manufacturers and well equipped test laboratories. 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.