Calibration frequency of dose–area product meters

Crawley, M T; Mutch, Steven; Nyekiova, M; Reddy, C.A.; Weatherburn, H.

doi:10.1259/bjr.74.879.740259

Cited by 12 publications

(7 citation statements)

References 0 publications

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“…Frequently, DAP meters were not found to account for table attenuation [48,54], consequently the correct DAP and skin dose to the patient may be lower than the values reported in this study. A solid-state detector was used to determine the table-top attenuation at various tube angulations.…”

Section: Appendixmentioning

confidence: 58%

Impact of biplane versus single-plane imaging on radiation dose, contrast load and procedural time in coronary angioplasty

Sadick¹,

Reed²,

Collins³

et al. 2010

BJR

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ABSTRACT. Coronary angioplasties can be performed with either single-plane or biplane imaging techniques. The aim of this study was to determine whether biplane imaging, in comparison to single-plane imaging, reduces radiation dose and contrast load and shortens procedural time during (i) primary and elective coronary angioplasty procedures, (ii) angioplasty to the main vascular territories and (iii) procedures performed by operators with various levels of experience. This prospective observational study included a total of 504 primary and elective single-vessel coronary angioplasty procedures utilising either biplane or single-plane imaging. Radiographic and clinical parameters were collected from clinical reports and examination protocols. Radiation dose was measured by a dose-area-product (DAP) meter intrinsic to the angiography system. Our results showed that biplane imaging delivered a significantly greater radiation dose (181.4¡121.0 Gycm 2 ) than single-plane imaging (133.6¡92.8 Gycm 2 , p,0.0001). The difference was independent of case type (primary or elective) (p50.862), vascular territory (p50.519) and operator experience (p50.903). No significant difference was found in contrast load between biplane (166.8¡62.9 ml) and single-plane imaging (176.8¡66.0 ml) (p50.302). This non-significant difference was independent of case type (p50.551), vascular territory (p50.308) and operator experience (p50.304). Procedures performed with biplane imaging were significantly longer (55.3¡27.8 min) than those with single-plane (48.9¡24.2 min, p50.010) and, similarly, were not dependent on case type (p50.226), vascular territory (p50.642) or operator experience (p50.094). Biplane imaging resulted in a greater radiation dose and a longer procedural time and delivered a non-significant reduction in contrast load than single-plane imaging. These findings did not support the commonly perceived advantages of using biplane imaging in single-vessel coronary interventional procedures.

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Section: Appendixmentioning

confidence: 58%

Impact of biplane versus single-plane imaging on radiation dose, contrast load and procedural time in coronary angioplasty

Sadick¹,

Reed²,

Collins³

et al. 2010

BJR

View full text Add to dashboard Cite

show abstract

“…This de-identified information was analysed for the period from 1-2-04 to 16-8-04 following installation of the Siemens flat panel unit. The DAP meters on both units were calibrated 27 at typical clinical operations kilovoltage 28 . It was found that all DAP meters had been factory calibrated without regard for the effect of the table attenuation 27,28 .…”

Section: Patient Dose Comparisonmentioning

confidence: 99%

“…The DAP meters on both units were calibrated 27 at typical clinical operations kilovoltage 28 . It was found that all DAP meters had been factory calibrated without regard for the effect of the table attenuation 27,28 . Lateral projection DAP displays were found to be within 5% of air dose measurements using a specially designed jig to display the exposure area at the point of dose measurement.…”

Section: Patient Dose Comparisonmentioning

confidence: 99%

Comparative evaluation of an II based and a flat panel based cardiovascular fluoroscopy system within a clinical environment

Grewal

McLean

2005

Australas. Phys. Eng. Sci. Med.

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The image quality and dose parameters from a 2004 Siemens Axiom Artis dBC cardiac biplane with flat panel detector were evaluated and compared to similar parameters evaluated for a 1977 Toshiba DPF 2000A biplane cardiac unit with a conventional image intensifier. Image quality assessment was performed with the Westmead test object; using solid water as a patient equivalent absorber. The patient dose comparison of the two systems is based on dose area product meter readings for 1512 patient cases recorded over 6 months following installation of the Siemens flat panel digital unit. The image quality results indicate that: (a) high contrast resolution was better with the digital flat panel unit, (b) low contrast resolution is similar between systems, and (c) the threshold contrast of the flat panel system is the same or inferior to that of the image intensifier system. Input dose to the surface of the flat panel detector showed a strong dependence on field size, similar to the behaviour of image intensifier system. For the most common clinical procedure--Left Heart Study via Judkins--the average total dose area product reading was 64.0 Gy-cm2 against 67.7 Gy-cm2 for the digital and conventional units respectively (p = 0.27) indicating no significant difference in dose performance between the two x-ray machines.

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“…International radiation protection authorities recommend and also demand that quality assurance tests of radiological equipment be performed periodically. Further, which testing methods and parameters to be tested for different types of equipment are suggested in recommendations (10‐23) . The aim of annual quality assurance test is to ensure that the quality of the production of medical images provide the right information (24) .…”

Section: Introductionmentioning

confidence: 99%

CT image quality over time: comparison of image quality for six different CT scanners over a six‐year period

Roa

Andersen

Martinsen

2015

J Applied Clin Med Phys

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UNSCEAR concluded that increased use of CT scanning caused dramatic changes in population dose. Therefore, international radiation protection authorities demand: 1) periodical quality assurance tests with respect to image quality and radiation dose, and 2) optimization of all examination protocols with respect to image quality and radiation dose. This study aimed to evaluate and analyze multiple image quality parameters and variability measured throughout time for six different CT scanners from four different vendors, in order to evaluate the current methodology for QA controls of CT systems. The results from this study indicate that there is minor drifting in the image noise and uniformity and in the spatial resolution over time for CT scanners, independent of vendors. The HU for different object densities vary between different CT scanner models from different vendors, and over time for one specific CT scanner. Future tests of interphantom and intraphantom variations, along with inclusion of more CT scanners, are necessary to establish robust baselines and recommendations of methodology for QA controls of CT systems, independent of model and vendor.PACS number: 07, 87

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Calibration frequency of dose–area product meters

Cited by 12 publications

References 0 publications

Impact of biplane versus single-plane imaging on radiation dose, contrast load and procedural time in coronary angioplasty

Impact of biplane versus single-plane imaging on radiation dose, contrast load and procedural time in coronary angioplasty

Comparative evaluation of an II based and a flat panel based cardiovascular fluoroscopy system within a clinical environment

CT image quality over time: comparison of image quality for six different CT scanners over a six‐year period

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