FLUG 2017 – IPEM Evidence Based QA Working Party – Fluoroscopy and Fluorography – dosimetry; Mark Worrall

FLUG 2017 – IPEM Evidence Based QA Working Party – Fluoroscopy and Fluorography – dosimetry; Mark Worrall

By Jonathan Cole Comment Closed
  Background There is little evidence in peer reviewed literature to support the efficacy of many of the tests of x-ray equipment performed routinely by medical physics departments. Current guidance is based on the substantial experience of the members of working parties involved in writing IPEM report 91 and the IPEM report 32 series. The aim of this working party is to produce evidence that would support any future revisions of IPEM Reports 91 and 32. The specific focus of this workstream is on the efficacy of routine tests in fluoroscopy and fluorography. Methods A pro-forma for data collection was devised, tested and revised by the working party. The final pro-forma contained fields to collect data relating to all tests routinely undertaken on fluoroscopy and fluorography equipment. The fields were designed to accept simple pass/fail or the quantitative result, whichever was most appropriate for each specific test. The pro-forma was developed in such a way that as much or as little information could...
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FLUG 2017 – IPEM Evidence Based QA Working Party – Fluoroscopy and Fluorography – image quality; Daniel Shaw

FLUG 2017 – IPEM Evidence Based QA Working Party – Fluoroscopy and Fluorography – image quality; Daniel Shaw

By Jonathan Cole Comment Closed
  Background There is little evidence in peer reviewed literature to support the efficacy of many of the tests of x-ray equipment performed routinely by medical physics departments. Current guidance is based on the substantial experience of the members of working parties involved in writing IPEM report 91 and the IPEM report 32 series. The aim of this working party is to produce evidence that would support any future revisions of IPEM Reports 91 and 32. The specific focus of this workstream is on the efficacy of routine tests in fluoroscopy and fluorography. Methods A pro-forma for data collection was devised, tested and revised by the working party. The final pro-forma contained fields to collect data relating to all tests routinely undertaken on fluoroscopy and fluorography equipment. The fields were designed to accept simple pass/fail or the quantitative result, whichever was most appropriate for each specific test. The pro-forma was developed in such a way that as much or as little information could...
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FLUG 2017 – A Novel Quantitative Measurement of Image Quality in Fluoroscopy; Patrick Kenny

FLUG 2017 – A Novel Quantitative Measurement of Image Quality in Fluoroscopy; Patrick Kenny

By Jonathan Cole Comment Closed
  Measuring image quality on modern flat panel fluoroscopy systems is challenging. Accurate measurements using the Leeds TO10 must use a small range of prescribed settings of beam quality (kV & added copper). Often these are not always easily achieved on newer systems. Also, TO10 analysis involves estimating the Threshold Contrast Index HT(A), which is a subjective estimate of the image’s signal to noise ratio. It is the inverse of the product of the square root of the disc area times its nominal contrast, as derived from Rose’s model of imaging. Finally, a typical measurement error of about 15% is associated with such an estimate of HT(A). More recently we are beginning to use the NEMA XR-27 protocol in which ‘for-processing’ images can be used to calculate MTF, NNPS & DQE etc. However, while representing a welcome development, such measurements do not address the effects of image processing applied prior to image presentation. It is in some ways an interim...
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